[mesa.git] / src / gallium / drivers / radeonsi / si_shader.c

/*
 * Copyright 2012 Advanced Micro Devices, Inc.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * on the rights to use, copy, modify, merge, publish, distribute, sub
 * license, and/or sell copies of the Software, and to permit persons to whom
 * the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include "util/u_memory.h"
#include "util/u_string.h"
#include "tgsi/tgsi_build.h"
#include "tgsi/tgsi_util.h"
#include "tgsi/tgsi_dump.h"

#include "ac_exp_param.h"
#include "ac_shader_util.h"
#include "ac_llvm_util.h"
#include "si_shader_internal.h"
#include "si_pipe.h"
#include "sid.h"

#include "compiler/nir/nir.h"

static const char *scratch_rsrc_dword0_symbol =
        "SCRATCH_RSRC_DWORD0";

static const char *scratch_rsrc_dword1_symbol =
        "SCRATCH_RSRC_DWORD1";

struct si_shader_output_values
{
        LLVMValueRef values[4];
        unsigned semantic_name;
        unsigned semantic_index;
        ubyte vertex_stream[4];
};

static void si_init_shader_ctx(struct si_shader_context *ctx,
                               struct si_screen *sscreen,
                               struct ac_llvm_compiler *compiler);

static void si_llvm_emit_barrier(const struct lp_build_tgsi_action *action,
                                 struct lp_build_tgsi_context *bld_base,
                                 struct lp_build_emit_data *emit_data);

static void si_dump_shader_key(unsigned processor, const struct si_shader *shader,
                               FILE *f);

static void si_build_vs_prolog_function(struct si_shader_context *ctx,
                                        union si_shader_part_key *key);
static void si_build_tcs_epilog_function(struct si_shader_context *ctx,
                                         union si_shader_part_key *key);
static void si_build_ps_prolog_function(struct si_shader_context *ctx,
                                        union si_shader_part_key *key);
static void si_build_ps_epilog_function(struct si_shader_context *ctx,
                                        union si_shader_part_key *key);
static void si_fix_resource_usage(struct si_screen *sscreen,
                                  struct si_shader *shader);

/* Ideally pass the sample mask input to the PS epilog as v14, which
 * is its usual location, so that the shader doesn't have to add v_mov.
 */
#define PS_EPILOG_SAMPLEMASK_MIN_LOC 14

static bool llvm_type_is_64bit(struct si_shader_context *ctx,
                               LLVMTypeRef type)
{
        if (type == ctx->ac.i64 || type == ctx->ac.f64)
                return true;

        return false;
}

static bool is_merged_shader(struct si_shader_context *ctx)
{
        if (ctx->screen->info.chip_class <= GFX8)
                return false;

        return ctx->shader->key.as_ls ||
               ctx->shader->key.as_es ||
               ctx->type == PIPE_SHADER_TESS_CTRL ||
               ctx->type == PIPE_SHADER_GEOMETRY;
}

void si_init_function_info(struct si_function_info *fninfo)
{
        fninfo->num_params = 0;
        fninfo->num_sgpr_params = 0;
}

unsigned add_arg_assign(struct si_function_info *fninfo,
                        enum si_arg_regfile regfile, LLVMTypeRef type,
                        LLVMValueRef *assign)
{
        assert(regfile != ARG_SGPR || fninfo->num_sgpr_params == fninfo->num_params);

        unsigned idx = fninfo->num_params++;
        assert(idx < ARRAY_SIZE(fninfo->types));

        if (regfile == ARG_SGPR)
                fninfo->num_sgpr_params = fninfo->num_params;

        fninfo->types[idx] = type;
        fninfo->assign[idx] = assign;
        return idx;
}

static unsigned add_arg(struct si_function_info *fninfo,
                        enum si_arg_regfile regfile, LLVMTypeRef type)
{
        return add_arg_assign(fninfo, regfile, type, NULL);
}

static void add_arg_assign_checked(struct si_function_info *fninfo,
                                   enum si_arg_regfile regfile, LLVMTypeRef type,
                                   LLVMValueRef *assign, unsigned idx)
{
        MAYBE_UNUSED unsigned actual = add_arg_assign(fninfo, regfile, type, assign);
        assert(actual == idx);
}

static void add_arg_checked(struct si_function_info *fninfo,
                            enum si_arg_regfile regfile, LLVMTypeRef type,
                            unsigned idx)
{
        add_arg_assign_checked(fninfo, regfile, type, NULL, idx);
}

/**
 * Returns a unique index for a per-patch semantic name and index. The index
 * must be less than 32, so that a 32-bit bitmask of used inputs or outputs
 * can be calculated.
 */
unsigned si_shader_io_get_unique_index_patch(unsigned semantic_name, unsigned index)
{
        switch (semantic_name) {
        case TGSI_SEMANTIC_TESSOUTER:
                return 0;
        case TGSI_SEMANTIC_TESSINNER:
                return 1;
        case TGSI_SEMANTIC_PATCH:
                assert(index < 30);
                return 2 + index;

        default:
                assert(!"invalid semantic name");
                return 0;
        }
}

/**
 * Returns a unique index for a semantic name and index. The index must be
 * less than 64, so that a 64-bit bitmask of used inputs or outputs can be
 * calculated.
 */
unsigned si_shader_io_get_unique_index(unsigned semantic_name, unsigned index,
                                       unsigned is_varying)
{
        switch (semantic_name) {
        case TGSI_SEMANTIC_POSITION:
                return 0;
        case TGSI_SEMANTIC_GENERIC:
                /* Since some shader stages use the the highest used IO index
                 * to determine the size to allocate for inputs/outputs
                 * (in LDS, tess and GS rings). GENERIC should be placed right
                 * after POSITION to make that size as small as possible.
                 */
                if (index < SI_MAX_IO_GENERIC)
                        return 1 + index;

                assert(!"invalid generic index");
                return 0;
        case TGSI_SEMANTIC_PSIZE:
                return SI_MAX_IO_GENERIC + 1;
        case TGSI_SEMANTIC_CLIPDIST:
                assert(index <= 1);
                return SI_MAX_IO_GENERIC + 2 + index;
        case TGSI_SEMANTIC_FOG:
                return SI_MAX_IO_GENERIC + 4;
        case TGSI_SEMANTIC_LAYER:
                return SI_MAX_IO_GENERIC + 5;
        case TGSI_SEMANTIC_VIEWPORT_INDEX:
                return SI_MAX_IO_GENERIC + 6;
        case TGSI_SEMANTIC_PRIMID:
                return SI_MAX_IO_GENERIC + 7;
        case TGSI_SEMANTIC_COLOR:
                assert(index < 2);
                return SI_MAX_IO_GENERIC + 8 + index;
        case TGSI_SEMANTIC_BCOLOR:
                assert(index < 2);
                /* If it's a varying, COLOR and BCOLOR alias. */
                if (is_varying)
                        return SI_MAX_IO_GENERIC + 8 + index;
                else
                        return SI_MAX_IO_GENERIC + 10 + index;
        case TGSI_SEMANTIC_TEXCOORD:
                assert(index < 8);
                STATIC_ASSERT(SI_MAX_IO_GENERIC + 12 + 8 <= 63);
                return SI_MAX_IO_GENERIC + 12 + index;
        case TGSI_SEMANTIC_CLIPVERTEX:
                return 63;
        default:
                fprintf(stderr, "invalid semantic name = %u\n", semantic_name);
                assert(!"invalid semantic name");
                return 0;
        }
}

/**
 * Get the value of a shader input parameter and extract a bitfield.
 */
static LLVMValueRef unpack_llvm_param(struct si_shader_context *ctx,
                                      LLVMValueRef value, unsigned rshift,
                                      unsigned bitwidth)
{
        if (LLVMGetTypeKind(LLVMTypeOf(value)) == LLVMFloatTypeKind)
                value = ac_to_integer(&ctx->ac, value);

        if (rshift)
                value = LLVMBuildLShr(ctx->ac.builder, value,
                                      LLVMConstInt(ctx->i32, rshift, 0), "");

        if (rshift + bitwidth < 32) {
                unsigned mask = (1 << bitwidth) - 1;
                value = LLVMBuildAnd(ctx->ac.builder, value,
                                     LLVMConstInt(ctx->i32, mask, 0), "");
        }

        return value;
}

LLVMValueRef si_unpack_param(struct si_shader_context *ctx,
                             unsigned param, unsigned rshift,
                             unsigned bitwidth)
{
        LLVMValueRef value = LLVMGetParam(ctx->main_fn, param);

        return unpack_llvm_param(ctx, value, rshift, bitwidth);
}

static LLVMValueRef get_rel_patch_id(struct si_shader_context *ctx)
{
        switch (ctx->type) {
        case PIPE_SHADER_TESS_CTRL:
                return unpack_llvm_param(ctx, ctx->abi.tcs_rel_ids, 0, 8);

        case PIPE_SHADER_TESS_EVAL:
                return LLVMGetParam(ctx->main_fn,
                                    ctx->param_tes_rel_patch_id);

        default:
                assert(0);
                return NULL;
        }
}

/* Tessellation shaders pass outputs to the next shader using LDS.
 *
 * LS outputs = TCS inputs
 * TCS outputs = TES inputs
 *
 * The LDS layout is:
 * - TCS inputs for patch 0
 * - TCS inputs for patch 1
 * - TCS inputs for patch 2             = get_tcs_in_current_patch_offset (if RelPatchID==2)
 * - ...
 * - TCS outputs for patch 0            = get_tcs_out_patch0_offset
 * - Per-patch TCS outputs for patch 0  = get_tcs_out_patch0_patch_data_offset
 * - TCS outputs for patch 1
 * - Per-patch TCS outputs for patch 1
 * - TCS outputs for patch 2            = get_tcs_out_current_patch_offset (if RelPatchID==2)
 * - Per-patch TCS outputs for patch 2  = get_tcs_out_current_patch_data_offset (if RelPatchID==2)
 * - ...
 *
 * All three shaders VS(LS), TCS, TES share the same LDS space.
 */

static LLVMValueRef
get_tcs_in_patch_stride(struct si_shader_context *ctx)
{
        return si_unpack_param(ctx, ctx->param_vs_state_bits, 8, 13);
}

static unsigned get_tcs_out_vertex_dw_stride_constant(struct si_shader_context *ctx)
{
        assert(ctx->type == PIPE_SHADER_TESS_CTRL);

        if (ctx->shader->key.mono.u.ff_tcs_inputs_to_copy)
                return util_last_bit64(ctx->shader->key.mono.u.ff_tcs_inputs_to_copy) * 4;

        return util_last_bit64(ctx->shader->selector->outputs_written) * 4;
}

static LLVMValueRef get_tcs_out_vertex_dw_stride(struct si_shader_context *ctx)
{
        unsigned stride = get_tcs_out_vertex_dw_stride_constant(ctx);

        return LLVMConstInt(ctx->i32, stride, 0);
}

static LLVMValueRef get_tcs_out_patch_stride(struct si_shader_context *ctx)
{
        if (ctx->shader->key.mono.u.ff_tcs_inputs_to_copy)
                return si_unpack_param(ctx, ctx->param_tcs_out_lds_layout, 0, 13);

        const struct tgsi_shader_info *info = &ctx->shader->selector->info;
        unsigned tcs_out_vertices = info->properties[TGSI_PROPERTY_TCS_VERTICES_OUT];
        unsigned vertex_dw_stride = get_tcs_out_vertex_dw_stride_constant(ctx);
        unsigned num_patch_outputs = util_last_bit64(ctx->shader->selector->patch_outputs_written);
        unsigned patch_dw_stride = tcs_out_vertices * vertex_dw_stride +
                                   num_patch_outputs * 4;
        return LLVMConstInt(ctx->i32, patch_dw_stride, 0);
}

static LLVMValueRef
get_tcs_out_patch0_offset(struct si_shader_context *ctx)
{
        return LLVMBuildMul(ctx->ac.builder,
                            si_unpack_param(ctx,
                                            ctx->param_tcs_out_lds_offsets,
                                            0, 16),
                            LLVMConstInt(ctx->i32, 4, 0), "");
}

static LLVMValueRef
get_tcs_out_patch0_patch_data_offset(struct si_shader_context *ctx)
{
        return LLVMBuildMul(ctx->ac.builder,
                            si_unpack_param(ctx,
                                            ctx->param_tcs_out_lds_offsets,
                                            16, 16),
                            LLVMConstInt(ctx->i32, 4, 0), "");
}

static LLVMValueRef
get_tcs_in_current_patch_offset(struct si_shader_context *ctx)
{
        LLVMValueRef patch_stride = get_tcs_in_patch_stride(ctx);
        LLVMValueRef rel_patch_id = get_rel_patch_id(ctx);

        return LLVMBuildMul(ctx->ac.builder, patch_stride, rel_patch_id, "");
}

static LLVMValueRef
get_tcs_out_current_patch_offset(struct si_shader_context *ctx)
{
        LLVMValueRef patch0_offset = get_tcs_out_patch0_offset(ctx);
        LLVMValueRef patch_stride = get_tcs_out_patch_stride(ctx);
        LLVMValueRef rel_patch_id = get_rel_patch_id(ctx);

        return ac_build_imad(&ctx->ac, patch_stride, rel_patch_id, patch0_offset);
}

static LLVMValueRef
get_tcs_out_current_patch_data_offset(struct si_shader_context *ctx)
{
        LLVMValueRef patch0_patch_data_offset =
                get_tcs_out_patch0_patch_data_offset(ctx);
        LLVMValueRef patch_stride = get_tcs_out_patch_stride(ctx);
        LLVMValueRef rel_patch_id = get_rel_patch_id(ctx);

        return ac_build_imad(&ctx->ac, patch_stride, rel_patch_id, patch0_patch_data_offset);
}

static LLVMValueRef get_num_tcs_out_vertices(struct si_shader_context *ctx)
{
        unsigned tcs_out_vertices =
                ctx->shader->selector ?
                ctx->shader->selector->info.properties[TGSI_PROPERTY_TCS_VERTICES_OUT] : 0;

        /* If !tcs_out_vertices, it's either the fixed-func TCS or the TCS epilog. */
        if (ctx->type == PIPE_SHADER_TESS_CTRL && tcs_out_vertices)
                return LLVMConstInt(ctx->i32, tcs_out_vertices, 0);

        return si_unpack_param(ctx, ctx->param_tcs_offchip_layout, 6, 6);
}

static LLVMValueRef get_tcs_in_vertex_dw_stride(struct si_shader_context *ctx)
{
        unsigned stride;

        switch (ctx->type) {
        case PIPE_SHADER_VERTEX:
                stride = ctx->shader->selector->lshs_vertex_stride / 4;
                return LLVMConstInt(ctx->i32, stride, 0);

        case PIPE_SHADER_TESS_CTRL:
                if (ctx->screen->info.chip_class >= GFX9 &&
                    ctx->shader->is_monolithic) {
                        stride = ctx->shader->key.part.tcs.ls->lshs_vertex_stride / 4;
                        return LLVMConstInt(ctx->i32, stride, 0);
                }
                return si_unpack_param(ctx, ctx->param_vs_state_bits, 24, 8);

        default:
                assert(0);
                return NULL;
        }
}

static LLVMValueRef unpack_sint16(struct si_shader_context *ctx,
                                 LLVMValueRef i32, unsigned index)
{
        assert(index <= 1);

        if (index == 1)
                return LLVMBuildAShr(ctx->ac.builder, i32,
                                     LLVMConstInt(ctx->i32, 16, 0), "");

        return LLVMBuildSExt(ctx->ac.builder,
                             LLVMBuildTrunc(ctx->ac.builder, i32,
                                            ctx->ac.i16, ""),
                             ctx->i32, "");
}

void si_llvm_load_input_vs(
        struct si_shader_context *ctx,
        unsigned input_index,
        LLVMValueRef out[4])
{
        const struct tgsi_shader_info *info = &ctx->shader->selector->info;
        unsigned vs_blit_property = info->properties[TGSI_PROPERTY_VS_BLIT_SGPRS];

        if (vs_blit_property) {
                LLVMValueRef vertex_id = ctx->abi.vertex_id;
                LLVMValueRef sel_x1 = LLVMBuildICmp(ctx->ac.builder,
                                                    LLVMIntULE, vertex_id,
                                                    ctx->i32_1, "");
                /* Use LLVMIntNE, because we have 3 vertices and only
                 * the middle one should use y2.
                 */
                LLVMValueRef sel_y1 = LLVMBuildICmp(ctx->ac.builder,
                                                    LLVMIntNE, vertex_id,
                                                    ctx->i32_1, "");

                if (input_index == 0) {
                        /* Position: */
                        LLVMValueRef x1y1 = LLVMGetParam(ctx->main_fn,
                                                         ctx->param_vs_blit_inputs);
                        LLVMValueRef x2y2 = LLVMGetParam(ctx->main_fn,
                                                         ctx->param_vs_blit_inputs + 1);

                        LLVMValueRef x1 = unpack_sint16(ctx, x1y1, 0);
                        LLVMValueRef y1 = unpack_sint16(ctx, x1y1, 1);
                        LLVMValueRef x2 = unpack_sint16(ctx, x2y2, 0);
                        LLVMValueRef y2 = unpack_sint16(ctx, x2y2, 1);

                        LLVMValueRef x = LLVMBuildSelect(ctx->ac.builder, sel_x1,
                                                         x1, x2, "");
                        LLVMValueRef y = LLVMBuildSelect(ctx->ac.builder, sel_y1,
                                                         y1, y2, "");

                        out[0] = LLVMBuildSIToFP(ctx->ac.builder, x, ctx->f32, "");
                        out[1] = LLVMBuildSIToFP(ctx->ac.builder, y, ctx->f32, "");
                        out[2] = LLVMGetParam(ctx->main_fn,
                                              ctx->param_vs_blit_inputs + 2);
                        out[3] = ctx->ac.f32_1;
                        return;
                }

                /* Color or texture coordinates: */
                assert(input_index == 1);

                if (vs_blit_property == SI_VS_BLIT_SGPRS_POS_COLOR) {
                        for (int i = 0; i < 4; i++) {
                                out[i] = LLVMGetParam(ctx->main_fn,
                                                      ctx->param_vs_blit_inputs + 3 + i);
                        }
                } else {
                        assert(vs_blit_property == SI_VS_BLIT_SGPRS_POS_TEXCOORD);
                        LLVMValueRef x1 = LLVMGetParam(ctx->main_fn,
                                                       ctx->param_vs_blit_inputs + 3);
                        LLVMValueRef y1 = LLVMGetParam(ctx->main_fn,
                                                       ctx->param_vs_blit_inputs + 4);
                        LLVMValueRef x2 = LLVMGetParam(ctx->main_fn,
                                                       ctx->param_vs_blit_inputs + 5);
                        LLVMValueRef y2 = LLVMGetParam(ctx->main_fn,
                                                       ctx->param_vs_blit_inputs + 6);

                        out[0] = LLVMBuildSelect(ctx->ac.builder, sel_x1,
                                                 x1, x2, "");
                        out[1] = LLVMBuildSelect(ctx->ac.builder, sel_y1,
                                                 y1, y2, "");
                        out[2] = LLVMGetParam(ctx->main_fn,
                                              ctx->param_vs_blit_inputs + 7);
                        out[3] = LLVMGetParam(ctx->main_fn,
                                              ctx->param_vs_blit_inputs + 8);
                }
                return;
        }

        union si_vs_fix_fetch fix_fetch;
        LLVMValueRef t_list_ptr;
        LLVMValueRef t_offset;
        LLVMValueRef t_list;
        LLVMValueRef vertex_index;
        LLVMValueRef tmp;

        /* Load the T list */
        t_list_ptr = LLVMGetParam(ctx->main_fn, ctx->param_vertex_buffers);

        t_offset = LLVMConstInt(ctx->i32, input_index, 0);

        t_list = ac_build_load_to_sgpr(&ctx->ac, t_list_ptr, t_offset);

        vertex_index = LLVMGetParam(ctx->main_fn,
                                    ctx->param_vertex_index0 +
                                    input_index);

        /* Use the open-coded implementation for all loads of doubles and
         * of dword-sized data that needs fixups. We need to insert conversion
         * code anyway, and the amd/common code does it for us.
         *
         * Note: On LLVM <= 8, we can only open-code formats with
         * channel size >= 4 bytes.
         */
        bool opencode = ctx->shader->key.mono.vs_fetch_opencode & (1 << input_index);
        fix_fetch.bits = ctx->shader->key.mono.vs_fix_fetch[input_index].bits;
        if (opencode ||
            (fix_fetch.u.log_size == 3 && fix_fetch.u.format == AC_FETCH_FORMAT_FLOAT) ||
            (fix_fetch.u.log_size == 2)) {
                tmp = ac_build_opencoded_load_format(
                                &ctx->ac, fix_fetch.u.log_size, fix_fetch.u.num_channels_m1 + 1,
                                fix_fetch.u.format, fix_fetch.u.reverse, !opencode,
                                t_list, vertex_index, ctx->ac.i32_0, ctx->ac.i32_0,
                                false, false, true);
                for (unsigned i = 0; i < 4; ++i)
                        out[i] = LLVMBuildExtractElement(ctx->ac.builder, tmp, LLVMConstInt(ctx->i32, i, false), "");
                return;
        }

        /* Do multiple loads for special formats. */
        unsigned required_channels = util_last_bit(info->input_usage_mask[input_index]);
        LLVMValueRef fetches[4];
        unsigned num_fetches;
        unsigned fetch_stride;
        unsigned channels_per_fetch;

        if (fix_fetch.u.log_size <= 1 && fix_fetch.u.num_channels_m1 == 2) {
                num_fetches = MIN2(required_channels, 3);
                fetch_stride = 1 << fix_fetch.u.log_size;
                channels_per_fetch = 1;
        } else {
                num_fetches = 1;
                fetch_stride = 0;
                channels_per_fetch = required_channels;
        }

        for (unsigned i = 0; i < num_fetches; ++i) {
                LLVMValueRef voffset = LLVMConstInt(ctx->i32, fetch_stride * i, 0);
                fetches[i] = ac_build_buffer_load_format(&ctx->ac, t_list, vertex_index, voffset,
                                                         channels_per_fetch, false, true);
        }

        if (num_fetches == 1 && channels_per_fetch > 1) {
                LLVMValueRef fetch = fetches[0];
                for (unsigned i = 0; i < channels_per_fetch; ++i) {
                        tmp = LLVMConstInt(ctx->i32, i, false);
                        fetches[i] = LLVMBuildExtractElement(
                                ctx->ac.builder, fetch, tmp, "");
                }
                num_fetches = channels_per_fetch;
                channels_per_fetch = 1;
        }

        for (unsigned i = num_fetches; i < 4; ++i)
                fetches[i] = LLVMGetUndef(ctx->f32);

        if (fix_fetch.u.log_size <= 1 && fix_fetch.u.num_channels_m1 == 2 &&
            required_channels == 4) {
                if (fix_fetch.u.format == AC_FETCH_FORMAT_UINT || fix_fetch.u.format == AC_FETCH_FORMAT_SINT)
                        fetches[3] = ctx->ac.i32_1;
                else
                        fetches[3] = ctx->ac.f32_1;
        } else if (fix_fetch.u.log_size == 3 &&
                   (fix_fetch.u.format == AC_FETCH_FORMAT_SNORM ||
                    fix_fetch.u.format == AC_FETCH_FORMAT_SSCALED ||
                    fix_fetch.u.format == AC_FETCH_FORMAT_SINT) &&
                   required_channels == 4) {
                /* For 2_10_10_10, the hardware returns an unsigned value;
                 * convert it to a signed one.
                 */
                LLVMValueRef tmp = fetches[3];
                LLVMValueRef c30 = LLVMConstInt(ctx->i32, 30, 0);

                /* First, recover the sign-extended signed integer value. */
                if (fix_fetch.u.format == AC_FETCH_FORMAT_SSCALED)
                        tmp = LLVMBuildFPToUI(ctx->ac.builder, tmp, ctx->i32, "");
                else
                        tmp = ac_to_integer(&ctx->ac, tmp);

                /* For the integer-like cases, do a natural sign extension.
                 *
                 * For the SNORM case, the values are 0.0, 0.333, 0.666, 1.0
                 * and happen to contain 0, 1, 2, 3 as the two LSBs of the
                 * exponent.
                 */
                tmp = LLVMBuildShl(ctx->ac.builder, tmp,
                                   fix_fetch.u.format == AC_FETCH_FORMAT_SNORM ?
                                   LLVMConstInt(ctx->i32, 7, 0) : c30, "");
                tmp = LLVMBuildAShr(ctx->ac.builder, tmp, c30, "");

                /* Convert back to the right type. */
                if (fix_fetch.u.format == AC_FETCH_FORMAT_SNORM) {
                        LLVMValueRef clamp;
                        LLVMValueRef neg_one = LLVMConstReal(ctx->f32, -1.0);
                        tmp = LLVMBuildSIToFP(ctx->ac.builder, tmp, ctx->f32, "");
                        clamp = LLVMBuildFCmp(ctx->ac.builder, LLVMRealULT, tmp, neg_one, "");
                        tmp = LLVMBuildSelect(ctx->ac.builder, clamp, neg_one, tmp, "");
                } else if (fix_fetch.u.format == AC_FETCH_FORMAT_SSCALED) {
                        tmp = LLVMBuildSIToFP(ctx->ac.builder, tmp, ctx->f32, "");
                }

                fetches[3] = tmp;
        }

        for (unsigned i = 0; i < 4; ++i)
                out[i] = ac_to_float(&ctx->ac, fetches[i]);
}

static void declare_input_vs(
        struct si_shader_context *ctx,
        unsigned input_index,
        const struct tgsi_full_declaration *decl,
        LLVMValueRef out[4])
{
        si_llvm_load_input_vs(ctx, input_index, out);
}

static LLVMValueRef get_primitive_id(struct si_shader_context *ctx,
                                     unsigned swizzle)
{
        if (swizzle > 0)
                return ctx->i32_0;

        switch (ctx->type) {
        case PIPE_SHADER_VERTEX:
                return LLVMGetParam(ctx->main_fn,
                                    ctx->param_vs_prim_id);
        case PIPE_SHADER_TESS_CTRL:
                return ctx->abi.tcs_patch_id;
        case PIPE_SHADER_TESS_EVAL:
                return ctx->abi.tes_patch_id;
        case PIPE_SHADER_GEOMETRY:
                return ctx->abi.gs_prim_id;
        default:
                assert(0);
                return ctx->i32_0;
        }
}

/**
 * Return the value of tgsi_ind_register for indexing.
 * This is the indirect index with the constant offset added to it.
 */
LLVMValueRef si_get_indirect_index(struct si_shader_context *ctx,
                                   const struct tgsi_ind_register *ind,
                                   unsigned addr_mul,
                                   int rel_index)
{
        LLVMValueRef result;

        if (ind->File == TGSI_FILE_ADDRESS) {
                result = ctx->addrs[ind->Index][ind->Swizzle];
                result = LLVMBuildLoad(ctx->ac.builder, result, "");
        } else {
                struct tgsi_full_src_register src = {};

                src.Register.File = ind->File;
                src.Register.Index = ind->Index;

                /* Set the second index to 0 for constants. */
                if (ind->File == TGSI_FILE_CONSTANT)
                        src.Register.Dimension = 1;

                result = ctx->bld_base.emit_fetch_funcs[ind->File](&ctx->bld_base, &src,
                                                                   TGSI_TYPE_SIGNED,
                                                                   ind->Swizzle);
                result = ac_to_integer(&ctx->ac, result);
        }

        return ac_build_imad(&ctx->ac, result, LLVMConstInt(ctx->i32, addr_mul, 0),
                             LLVMConstInt(ctx->i32, rel_index, 0));
}

/**
 * Like si_get_indirect_index, but restricts the return value to a (possibly
 * undefined) value inside [0..num).
 */
LLVMValueRef si_get_bounded_indirect_index(struct si_shader_context *ctx,
                                           const struct tgsi_ind_register *ind,
                                           int rel_index, unsigned num)
{
        LLVMValueRef result = si_get_indirect_index(ctx, ind, 1, rel_index);

        return si_llvm_bound_index(ctx, result, num);
}

static LLVMValueRef get_dw_address_from_generic_indices(struct si_shader_context *ctx,
                                                        LLVMValueRef vertex_dw_stride,
                                                        LLVMValueRef base_addr,
                                                        LLVMValueRef vertex_index,
                                                        LLVMValueRef param_index,
                                                        unsigned input_index,
                                                        ubyte *name,
                                                        ubyte *index,
                                                        bool is_patch)
{
        if (vertex_dw_stride) {
                base_addr = ac_build_imad(&ctx->ac, vertex_index,
                                          vertex_dw_stride, base_addr);
        }

        if (param_index) {
                base_addr = ac_build_imad(&ctx->ac, param_index,
                                          LLVMConstInt(ctx->i32, 4, 0), base_addr);
        }

        int param = is_patch ?
                si_shader_io_get_unique_index_patch(name[input_index],
                                                    index[input_index]) :
                si_shader_io_get_unique_index(name[input_index],
                                              index[input_index], false);

        /* Add the base address of the element. */
        return LLVMBuildAdd(ctx->ac.builder, base_addr,
                            LLVMConstInt(ctx->i32, param * 4, 0), "");
}

/**
 * Calculate a dword address given an input or output register and a stride.
 */
static LLVMValueRef get_dw_address(struct si_shader_context *ctx,
                                   const struct tgsi_full_dst_register *dst,
                                   const struct tgsi_full_src_register *src,
                                   LLVMValueRef vertex_dw_stride,
                                   LLVMValueRef base_addr)
{
        struct tgsi_shader_info *info = &ctx->shader->selector->info;
        ubyte *name, *index, *array_first;
        int input_index;
        struct tgsi_full_dst_register reg;
        LLVMValueRef vertex_index = NULL;
        LLVMValueRef ind_index = NULL;

        /* Set the register description. The address computation is the same
         * for sources and destinations. */
        if (src) {
                reg.Register.File = src->Register.File;
                reg.Register.Index = src->Register.Index;
                reg.Register.Indirect = src->Register.Indirect;
                reg.Register.Dimension = src->Register.Dimension;
                reg.Indirect = src->Indirect;
                reg.Dimension = src->Dimension;
                reg.DimIndirect = src->DimIndirect;
        } else
                reg = *dst;

        /* If the register is 2-dimensional (e.g. an array of vertices
         * in a primitive), calculate the base address of the vertex. */
        if (reg.Register.Dimension) {
                if (reg.Dimension.Indirect)
                        vertex_index = si_get_indirect_index(ctx, &reg.DimIndirect,
                                                      1, reg.Dimension.Index);
                else
                        vertex_index = LLVMConstInt(ctx->i32, reg.Dimension.Index, 0);
        }

        /* Get information about the register. */
        if (reg.Register.File == TGSI_FILE_INPUT) {
                name = info->input_semantic_name;
                index = info->input_semantic_index;
                array_first = info->input_array_first;
        } else if (reg.Register.File == TGSI_FILE_OUTPUT) {
                name = info->output_semantic_name;
                index = info->output_semantic_index;
                array_first = info->output_array_first;
        } else {
                assert(0);
                return NULL;
        }

        if (reg.Register.Indirect) {
                /* Add the relative address of the element. */
                if (reg.Indirect.ArrayID)
                        input_index = array_first[reg.Indirect.ArrayID];
                else
                        input_index = reg.Register.Index;

                ind_index = si_get_indirect_index(ctx, &reg.Indirect,
                                                  1, reg.Register.Index - input_index);
        } else {
                input_index = reg.Register.Index;
        }

        return get_dw_address_from_generic_indices(ctx, vertex_dw_stride,
                                                   base_addr, vertex_index,
                                                   ind_index, input_index,
                                                   name, index,
                                                   !reg.Register.Dimension);
}

/* The offchip buffer layout for TCS->TES is
 *
 * - attribute 0 of patch 0 vertex 0
 * - attribute 0 of patch 0 vertex 1
 * - attribute 0 of patch 0 vertex 2
 *   ...
 * - attribute 0 of patch 1 vertex 0
 * - attribute 0 of patch 1 vertex 1
 *   ...
 * - attribute 1 of patch 0 vertex 0
 * - attribute 1 of patch 0 vertex 1
 *   ...
 * - per patch attribute 0 of patch 0
 * - per patch attribute 0 of patch 1
 *   ...
 *
 * Note that every attribute has 4 components.
 */
static LLVMValueRef get_tcs_tes_buffer_address(struct si_shader_context *ctx,
                                               LLVMValueRef rel_patch_id,
                                               LLVMValueRef vertex_index,
                                               LLVMValueRef param_index)
{
        LLVMValueRef base_addr, vertices_per_patch, num_patches, total_vertices;
        LLVMValueRef param_stride, constant16;

        vertices_per_patch = get_num_tcs_out_vertices(ctx);
        num_patches = si_unpack_param(ctx, ctx->param_tcs_offchip_layout, 0, 6);
        total_vertices = LLVMBuildMul(ctx->ac.builder, vertices_per_patch,
                                      num_patches, "");

        constant16 = LLVMConstInt(ctx->i32, 16, 0);
        if (vertex_index) {
                base_addr = ac_build_imad(&ctx->ac, rel_patch_id,
                                          vertices_per_patch, vertex_index);
                param_stride = total_vertices;
        } else {
                base_addr = rel_patch_id;
                param_stride = num_patches;
        }

        base_addr = ac_build_imad(&ctx->ac, param_index, param_stride, base_addr);
        base_addr = LLVMBuildMul(ctx->ac.builder, base_addr, constant16, "");

        if (!vertex_index) {
                LLVMValueRef patch_data_offset =
                           si_unpack_param(ctx, ctx->param_tcs_offchip_layout, 12, 20);

                base_addr = LLVMBuildAdd(ctx->ac.builder, base_addr,
                                         patch_data_offset, "");
        }
        return base_addr;
}

/* This is a generic helper that can be shared by the NIR and TGSI backends */
static LLVMValueRef get_tcs_tes_buffer_address_from_generic_indices(
                                        struct si_shader_context *ctx,
                                        LLVMValueRef vertex_index,
                                        LLVMValueRef param_index,
                                        unsigned param_base,
                                        ubyte *name,
                                        ubyte *index,
                                        bool is_patch)
{
        unsigned param_index_base;

        param_index_base = is_patch ?
                si_shader_io_get_unique_index_patch(name[param_base], index[param_base]) :
                si_shader_io_get_unique_index(name[param_base], index[param_base], false);

        if (param_index) {
                param_index = LLVMBuildAdd(ctx->ac.builder, param_index,
                                           LLVMConstInt(ctx->i32, param_index_base, 0),
                                           "");
        } else {
                param_index = LLVMConstInt(ctx->i32, param_index_base, 0);
        }

        return get_tcs_tes_buffer_address(ctx, get_rel_patch_id(ctx),
                                          vertex_index, param_index);
}

static LLVMValueRef get_tcs_tes_buffer_address_from_reg(
                                       struct si_shader_context *ctx,
                                       const struct tgsi_full_dst_register *dst,
                                       const struct tgsi_full_src_register *src)
{
        struct tgsi_shader_info *info = &ctx->shader->selector->info;
        ubyte *name, *index, *array_first;
        struct tgsi_full_src_register reg;
        LLVMValueRef vertex_index = NULL;
        LLVMValueRef param_index = NULL;
        unsigned param_base;

        reg = src ? *src : tgsi_full_src_register_from_dst(dst);

        if (reg.Register.Dimension) {

                if (reg.Dimension.Indirect)
                        vertex_index = si_get_indirect_index(ctx, &reg.DimIndirect,
                                                             1, reg.Dimension.Index);
                else
                        vertex_index = LLVMConstInt(ctx->i32, reg.Dimension.Index, 0);
        }

        /* Get information about the register. */
        if (reg.Register.File == TGSI_FILE_INPUT) {
                name = info->input_semantic_name;
                index = info->input_semantic_index;
                array_first = info->input_array_first;
        } else if (reg.Register.File == TGSI_FILE_OUTPUT) {
                name = info->output_semantic_name;
                index = info->output_semantic_index;
                array_first = info->output_array_first;
        } else {
                assert(0);
                return NULL;
        }

        if (reg.Register.Indirect) {
                if (reg.Indirect.ArrayID)
                        param_base = array_first[reg.Indirect.ArrayID];
                else
                        param_base = reg.Register.Index;

                param_index = si_get_indirect_index(ctx, &reg.Indirect,
                                                    1, reg.Register.Index - param_base);

        } else {
                param_base = reg.Register.Index;
        }

        return get_tcs_tes_buffer_address_from_generic_indices(ctx, vertex_index,
                                                               param_index, param_base,
                                                               name, index, !reg.Register.Dimension);
}

static LLVMValueRef buffer_load(struct lp_build_tgsi_context *bld_base,
                                LLVMTypeRef type, unsigned swizzle,
                                LLVMValueRef buffer, LLVMValueRef offset,
                                LLVMValueRef base, bool can_speculate)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        LLVMValueRef value, value2;
        LLVMTypeRef vec_type = LLVMVectorType(type, 4);

        if (swizzle == ~0) {
                value = ac_build_buffer_load(&ctx->ac, buffer, 4, NULL, base, offset,
                                             0, 1, 0, can_speculate, false);

                return LLVMBuildBitCast(ctx->ac.builder, value, vec_type, "");
        }

        if (!llvm_type_is_64bit(ctx, type)) {
                value = ac_build_buffer_load(&ctx->ac, buffer, 4, NULL, base, offset,
                                             0, 1, 0, can_speculate, false);

                value = LLVMBuildBitCast(ctx->ac.builder, value, vec_type, "");
                return LLVMBuildExtractElement(ctx->ac.builder, value,
                                    LLVMConstInt(ctx->i32, swizzle, 0), "");
        }

        value = ac_build_buffer_load(&ctx->ac, buffer, 1, NULL, base, offset,
                                  swizzle * 4, 1, 0, can_speculate, false);

        value2 = ac_build_buffer_load(&ctx->ac, buffer, 1, NULL, base, offset,
                                   swizzle * 4 + 4, 1, 0, can_speculate, false);

        return si_llvm_emit_fetch_64bit(bld_base, type, value, value2);
}

/**
 * Load from LDS.
 *
 * \param type          output value type
 * \param swizzle       offset (typically 0..3); it can be ~0, which loads a vec4
 * \param dw_addr       address in dwords
 */
static LLVMValueRef lds_load(struct lp_build_tgsi_context *bld_base,
                             LLVMTypeRef type, unsigned swizzle,
                             LLVMValueRef dw_addr)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        LLVMValueRef value;

        if (swizzle == ~0) {
                LLVMValueRef values[TGSI_NUM_CHANNELS];

                for (unsigned chan = 0; chan < TGSI_NUM_CHANNELS; chan++)
                        values[chan] = lds_load(bld_base, type, chan, dw_addr);

                return ac_build_gather_values(&ctx->ac, values,
                                              TGSI_NUM_CHANNELS);
        }

        /* Split 64-bit loads. */
        if (llvm_type_is_64bit(ctx, type)) {
                LLVMValueRef lo, hi;

                lo = lds_load(bld_base, ctx->i32, swizzle, dw_addr);
                hi = lds_load(bld_base, ctx->i32, swizzle + 1, dw_addr);
                return si_llvm_emit_fetch_64bit(bld_base, type, lo, hi);
        }

        dw_addr = LLVMBuildAdd(ctx->ac.builder, dw_addr,
                               LLVMConstInt(ctx->i32, swizzle, 0), "");

        value = ac_lds_load(&ctx->ac, dw_addr);

        return LLVMBuildBitCast(ctx->ac.builder, value, type, "");
}

/**
 * Store to LDS.
 *
 * \param swizzle       offset (typically 0..3)
 * \param dw_addr       address in dwords
 * \param value         value to store
 */
static void lds_store(struct si_shader_context *ctx,
                      unsigned dw_offset_imm, LLVMValueRef dw_addr,
                      LLVMValueRef value)
{
        dw_addr = LLVMBuildAdd(ctx->ac.builder, dw_addr,
                               LLVMConstInt(ctx->i32, dw_offset_imm, 0), "");

        ac_lds_store(&ctx->ac, dw_addr, value);
}

enum si_tess_ring {
        TCS_FACTOR_RING,
        TESS_OFFCHIP_RING_TCS,
        TESS_OFFCHIP_RING_TES,
};

static LLVMValueRef get_tess_ring_descriptor(struct si_shader_context *ctx,
                                             enum si_tess_ring ring)
{
        LLVMBuilderRef builder = ctx->ac.builder;
        unsigned param = ring == TESS_OFFCHIP_RING_TES ? ctx->param_tes_offchip_addr :
                                                         ctx->param_tcs_out_lds_layout;
        LLVMValueRef addr = LLVMGetParam(ctx->main_fn, param);

        /* TCS only receives high 13 bits of the address. */
        if (ring == TESS_OFFCHIP_RING_TCS || ring == TCS_FACTOR_RING) {
                addr = LLVMBuildAnd(builder, addr,
                                    LLVMConstInt(ctx->i32, 0xfff80000, 0), "");
        }

        if (ring == TCS_FACTOR_RING) {
                unsigned tf_offset = ctx->screen->tess_offchip_ring_size;
                addr = LLVMBuildAdd(builder, addr,
                                    LLVMConstInt(ctx->i32, tf_offset, 0), "");
        }

        LLVMValueRef desc[4];
        desc[0] = addr;
        desc[1] = LLVMConstInt(ctx->i32,
                               S_008F04_BASE_ADDRESS_HI(ctx->screen->info.address32_hi), 0);
        desc[2] = LLVMConstInt(ctx->i32, 0xffffffff, 0);
        desc[3] = LLVMConstInt(ctx->i32,
                               S_008F0C_DST_SEL_X(V_008F0C_SQ_SEL_X) |
                               S_008F0C_DST_SEL_Y(V_008F0C_SQ_SEL_Y) |
                               S_008F0C_DST_SEL_Z(V_008F0C_SQ_SEL_Z) |
                               S_008F0C_DST_SEL_W(V_008F0C_SQ_SEL_W) |
                               S_008F0C_NUM_FORMAT(V_008F0C_BUF_NUM_FORMAT_FLOAT) |
                               S_008F0C_DATA_FORMAT(V_008F0C_BUF_DATA_FORMAT_32), 0);

        return ac_build_gather_values(&ctx->ac, desc, 4);
}

static LLVMValueRef fetch_input_tcs(
        struct lp_build_tgsi_context *bld_base,
        const struct tgsi_full_src_register *reg,
        enum tgsi_opcode_type type, unsigned swizzle_in)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        LLVMValueRef dw_addr, stride;
        unsigned swizzle = swizzle_in & 0xffff;
        stride = get_tcs_in_vertex_dw_stride(ctx);
        dw_addr = get_tcs_in_current_patch_offset(ctx);
        dw_addr = get_dw_address(ctx, NULL, reg, stride, dw_addr);

        return lds_load(bld_base, tgsi2llvmtype(bld_base, type), swizzle, dw_addr);
}

static LLVMValueRef si_nir_load_tcs_varyings(struct ac_shader_abi *abi,
                                             LLVMTypeRef type,
                                             LLVMValueRef vertex_index,
                                             LLVMValueRef param_index,
                                             unsigned const_index,
                                             unsigned location,
                                             unsigned driver_location,
                                             unsigned component,
                                             unsigned num_components,
                                             bool is_patch,
                                             bool is_compact,
                                             bool load_input)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        struct tgsi_shader_info *info = &ctx->shader->selector->info;
        struct lp_build_tgsi_context *bld_base = &ctx->bld_base;
        LLVMValueRef dw_addr, stride;

        driver_location = driver_location / 4;

        if (load_input) {
                stride = get_tcs_in_vertex_dw_stride(ctx);
                dw_addr = get_tcs_in_current_patch_offset(ctx);
        } else {
                if (is_patch) {
                        stride = NULL;
                        dw_addr = get_tcs_out_current_patch_data_offset(ctx);
                } else {
                        stride = get_tcs_out_vertex_dw_stride(ctx);
                        dw_addr = get_tcs_out_current_patch_offset(ctx);
                }
        }

        if (param_index) {
                /* Add the constant index to the indirect index */
                param_index = LLVMBuildAdd(ctx->ac.builder, param_index,
                                           LLVMConstInt(ctx->i32, const_index, 0), "");
        } else {
                param_index = LLVMConstInt(ctx->i32, const_index, 0);
        }

        ubyte *names;
        ubyte *indices;
        if (load_input) {
                names = info->input_semantic_name;
                indices = info->input_semantic_index;
        } else {
                names = info->output_semantic_name;
                indices = info->output_semantic_index;
        }

        dw_addr = get_dw_address_from_generic_indices(ctx, stride, dw_addr,
                                                      vertex_index, param_index,
                                                      driver_location,
                                                      names, indices,
                                                      is_patch);

        LLVMValueRef value[4];
        for (unsigned i = 0; i < num_components; i++) {
                unsigned offset = i;
                if (llvm_type_is_64bit(ctx, type))
                        offset *= 2;

                offset += component;
                value[i + component] = lds_load(bld_base, type, offset, dw_addr);
        }

        return ac_build_varying_gather_values(&ctx->ac, value, num_components, component);
}

static LLVMValueRef fetch_output_tcs(
                struct lp_build_tgsi_context *bld_base,
                const struct tgsi_full_src_register *reg,
                enum tgsi_opcode_type type, unsigned swizzle_in)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        LLVMValueRef dw_addr, stride;
        unsigned swizzle = (swizzle_in & 0xffff);

        if (reg->Register.Dimension) {
                stride = get_tcs_out_vertex_dw_stride(ctx);
                dw_addr = get_tcs_out_current_patch_offset(ctx);
                dw_addr = get_dw_address(ctx, NULL, reg, stride, dw_addr);
        } else {
                dw_addr = get_tcs_out_current_patch_data_offset(ctx);
                dw_addr = get_dw_address(ctx, NULL, reg, NULL, dw_addr);
        }

        return lds_load(bld_base, tgsi2llvmtype(bld_base, type), swizzle, dw_addr);
}

static LLVMValueRef fetch_input_tes(
        struct lp_build_tgsi_context *bld_base,
        const struct tgsi_full_src_register *reg,
        enum tgsi_opcode_type type, unsigned swizzle_in)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        LLVMValueRef base, addr;
        unsigned swizzle = (swizzle_in & 0xffff);

        base = LLVMGetParam(ctx->main_fn, ctx->param_tcs_offchip_offset);
        addr = get_tcs_tes_buffer_address_from_reg(ctx, NULL, reg);

        return buffer_load(bld_base, tgsi2llvmtype(bld_base, type), swizzle,
                           ctx->tess_offchip_ring, base, addr, true);
}

LLVMValueRef si_nir_load_input_tes(struct ac_shader_abi *abi,
                                   LLVMTypeRef type,
                                   LLVMValueRef vertex_index,
                                   LLVMValueRef param_index,
                                   unsigned const_index,
                                   unsigned location,
                                   unsigned driver_location,
                                   unsigned component,
                                   unsigned num_components,
                                   bool is_patch,
                                   bool is_compact,
                                   bool load_input)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        struct tgsi_shader_info *info = &ctx->shader->selector->info;
        LLVMValueRef base, addr;

        driver_location = driver_location / 4;

        base = LLVMGetParam(ctx->main_fn, ctx->param_tcs_offchip_offset);

        if (param_index) {
                /* Add the constant index to the indirect index */
                param_index = LLVMBuildAdd(ctx->ac.builder, param_index,
                                           LLVMConstInt(ctx->i32, const_index, 0), "");
        } else {
                param_index = LLVMConstInt(ctx->i32, const_index, 0);
        }

        addr = get_tcs_tes_buffer_address_from_generic_indices(ctx, vertex_index,
                                                               param_index, driver_location,
                                                               info->input_semantic_name,
                                                               info->input_semantic_index,
                                                               is_patch);

        /* TODO: This will generate rather ordinary llvm code, although it
         * should be easy for the optimiser to fix up. In future we might want
         * to refactor buffer_load(), but for now this maximises code sharing
         * between the NIR and TGSI backends.
         */
        LLVMValueRef value[4];
        for (unsigned i = 0; i < num_components; i++) {
                unsigned offset = i;
                if (llvm_type_is_64bit(ctx, type))
                        offset *= 2;

                offset += component;
                value[i + component] = buffer_load(&ctx->bld_base, type, offset,
                                                   ctx->tess_offchip_ring, base, addr, true);
        }

        return ac_build_varying_gather_values(&ctx->ac, value, num_components, component);
}

static void store_output_tcs(struct lp_build_tgsi_context *bld_base,
                             const struct tgsi_full_instruction *inst,
                             const struct tgsi_opcode_info *info,
                             unsigned index,
                             LLVMValueRef dst[4])
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        const struct tgsi_full_dst_register *reg = &inst->Dst[index];
        const struct tgsi_shader_info *sh_info = &ctx->shader->selector->info;
        unsigned chan_index;
        LLVMValueRef dw_addr, stride;
        LLVMValueRef buffer, base, buf_addr;
        LLVMValueRef values[4];
        bool skip_lds_store;
        bool is_tess_factor = false, is_tess_inner = false;

        /* Only handle per-patch and per-vertex outputs here.
         * Vectors will be lowered to scalars and this function will be called again.
         */
        if (reg->Register.File != TGSI_FILE_OUTPUT ||
            (dst[0] && LLVMGetTypeKind(LLVMTypeOf(dst[0])) == LLVMVectorTypeKind)) {
                si_llvm_emit_store(bld_base, inst, info, index, dst);
                return;
        }

        if (reg->Register.Dimension) {
                stride = get_tcs_out_vertex_dw_stride(ctx);
                dw_addr = get_tcs_out_current_patch_offset(ctx);
                dw_addr = get_dw_address(ctx, reg, NULL, stride, dw_addr);
                skip_lds_store = !sh_info->reads_pervertex_outputs;
        } else {
                dw_addr = get_tcs_out_current_patch_data_offset(ctx);
                dw_addr = get_dw_address(ctx, reg, NULL, NULL, dw_addr);
                skip_lds_store = !sh_info->reads_perpatch_outputs;

                if (!reg->Register.Indirect) {
                        int name = sh_info->output_semantic_name[reg->Register.Index];

                        /* Always write tess factors into LDS for the TCS epilog. */
                        if (name == TGSI_SEMANTIC_TESSINNER ||
                            name == TGSI_SEMANTIC_TESSOUTER) {
                                /* The epilog doesn't read LDS if invocation 0 defines tess factors. */
                                skip_lds_store = !sh_info->reads_tessfactor_outputs &&
                                                 ctx->shader->selector->tcs_info.tessfactors_are_def_in_all_invocs;
                                is_tess_factor = true;
                                is_tess_inner = name == TGSI_SEMANTIC_TESSINNER;
                        }
                }
        }

        buffer = get_tess_ring_descriptor(ctx, TESS_OFFCHIP_RING_TCS);

        base = LLVMGetParam(ctx->main_fn, ctx->param_tcs_offchip_offset);
        buf_addr = get_tcs_tes_buffer_address_from_reg(ctx, reg, NULL);

        uint32_t writemask = reg->Register.WriteMask;
        while (writemask) {
                chan_index = u_bit_scan(&writemask);
                LLVMValueRef value = dst[chan_index];

                if (inst->Instruction.Saturate)
                        value = ac_build_clamp(&ctx->ac, value);

                /* Skip LDS stores if there is no LDS read of this output. */
                if (!skip_lds_store)
                        lds_store(ctx, chan_index, dw_addr, value);

                value = ac_to_integer(&ctx->ac, value);
                values[chan_index] = value;

                if (reg->Register.WriteMask != 0xF && !is_tess_factor) {
                        ac_build_buffer_store_dword(&ctx->ac, buffer, value, 1,
                                                    buf_addr, base,
                                                    4 * chan_index, 1, 0, true, false);
                }

                /* Write tess factors into VGPRs for the epilog. */
                if (is_tess_factor &&
                    ctx->shader->selector->tcs_info.tessfactors_are_def_in_all_invocs) {
                        if (!is_tess_inner) {
                                LLVMBuildStore(ctx->ac.builder, value, /* outer */
                                               ctx->invoc0_tess_factors[chan_index]);
                        } else if (chan_index < 2) {
                                LLVMBuildStore(ctx->ac.builder, value, /* inner */
                                               ctx->invoc0_tess_factors[4 + chan_index]);
                        }
                }
        }

        if (reg->Register.WriteMask == 0xF && !is_tess_factor) {
                LLVMValueRef value = ac_build_gather_values(&ctx->ac,
                                                            values, 4);
                ac_build_buffer_store_dword(&ctx->ac, buffer, value, 4, buf_addr,
                                            base, 0, 1, 0, true, false);
        }
}

static void si_nir_store_output_tcs(struct ac_shader_abi *abi,
                                    const struct nir_variable *var,
                                    LLVMValueRef vertex_index,
                                    LLVMValueRef param_index,
                                    unsigned const_index,
                                    LLVMValueRef src,
                                    unsigned writemask)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        struct tgsi_shader_info *info = &ctx->shader->selector->info;
        const unsigned component = var->data.location_frac;
        const bool is_patch = var->data.patch;
        unsigned driver_location = var->data.driver_location;
        LLVMValueRef dw_addr, stride;
        LLVMValueRef buffer, base, addr;
        LLVMValueRef values[4];
        bool skip_lds_store;
        bool is_tess_factor = false, is_tess_inner = false;

        driver_location = driver_location / 4;

        if (param_index) {
                /* Add the constant index to the indirect index */
                param_index = LLVMBuildAdd(ctx->ac.builder, param_index,
                                           LLVMConstInt(ctx->i32, const_index, 0), "");
        } else {
                if (const_index != 0)
                        param_index = LLVMConstInt(ctx->i32, const_index, 0);
        }

        if (!is_patch) {
                stride = get_tcs_out_vertex_dw_stride(ctx);
                dw_addr = get_tcs_out_current_patch_offset(ctx);
                dw_addr = get_dw_address_from_generic_indices(ctx, stride, dw_addr,
                                                              vertex_index, param_index,
                                                              driver_location,
                                                              info->output_semantic_name,
                                                              info->output_semantic_index,
                                                              is_patch);

                skip_lds_store = !info->reads_pervertex_outputs;
        } else {
                dw_addr = get_tcs_out_current_patch_data_offset(ctx);
                dw_addr = get_dw_address_from_generic_indices(ctx, NULL, dw_addr,
                                                              vertex_index, param_index,
                                                              driver_location,
                                                              info->output_semantic_name,
                                                              info->output_semantic_index,
                                                              is_patch);

                skip_lds_store = !info->reads_perpatch_outputs;

                if (!param_index) {
                        int name = info->output_semantic_name[driver_location];

                        /* Always write tess factors into LDS for the TCS epilog. */
                        if (name == TGSI_SEMANTIC_TESSINNER ||
                            name == TGSI_SEMANTIC_TESSOUTER) {
                                /* The epilog doesn't read LDS if invocation 0 defines tess factors. */
                                skip_lds_store = !info->reads_tessfactor_outputs &&
                                                 ctx->shader->selector->tcs_info.tessfactors_are_def_in_all_invocs;
                                is_tess_factor = true;
                                is_tess_inner = name == TGSI_SEMANTIC_TESSINNER;
                        }
                }
        }

        buffer = get_tess_ring_descriptor(ctx, TESS_OFFCHIP_RING_TCS);

        base = LLVMGetParam(ctx->main_fn, ctx->param_tcs_offchip_offset);

        addr = get_tcs_tes_buffer_address_from_generic_indices(ctx, vertex_index,
                                                               param_index, driver_location,
                                                               info->output_semantic_name,
                                                               info->output_semantic_index,
                                                               is_patch);

        for (unsigned chan = 0; chan < 4; chan++) {
                if (!(writemask & (1 << chan)))
                        continue;
                LLVMValueRef value = ac_llvm_extract_elem(&ctx->ac, src, chan - component);

                /* Skip LDS stores if there is no LDS read of this output. */
                if (!skip_lds_store)
                        lds_store(ctx, chan, dw_addr, value);

                value = ac_to_integer(&ctx->ac, value);
                values[chan] = value;

                if (writemask != 0xF && !is_tess_factor) {
                        ac_build_buffer_store_dword(&ctx->ac, buffer, value, 1,
                                                    addr, base,
                                                    4 * chan, 1, 0, true, false);
                }

                /* Write tess factors into VGPRs for the epilog. */
                if (is_tess_factor &&
                    ctx->shader->selector->tcs_info.tessfactors_are_def_in_all_invocs) {
                        if (!is_tess_inner) {
                                LLVMBuildStore(ctx->ac.builder, value, /* outer */
                                               ctx->invoc0_tess_factors[chan]);
                        } else if (chan < 2) {
                                LLVMBuildStore(ctx->ac.builder, value, /* inner */
                                               ctx->invoc0_tess_factors[4 + chan]);
                        }
                }
        }

        if (writemask == 0xF && !is_tess_factor) {
                LLVMValueRef value = ac_build_gather_values(&ctx->ac,
                                                            values, 4);
                ac_build_buffer_store_dword(&ctx->ac, buffer, value, 4, addr,
                                            base, 0, 1, 0, true, false);
        }
}

LLVMValueRef si_llvm_load_input_gs(struct ac_shader_abi *abi,
                                   unsigned input_index,
                                   unsigned vtx_offset_param,
                                   LLVMTypeRef type,
                                   unsigned swizzle)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        struct lp_build_tgsi_context *bld_base = &ctx->bld_base;
        struct si_shader *shader = ctx->shader;
        LLVMValueRef vtx_offset, soffset;
        struct tgsi_shader_info *info = &shader->selector->info;
        unsigned semantic_name = info->input_semantic_name[input_index];
        unsigned semantic_index = info->input_semantic_index[input_index];
        unsigned param;
        LLVMValueRef value;

        param = si_shader_io_get_unique_index(semantic_name, semantic_index, false);

        /* GFX9 has the ESGS ring in LDS. */
        if (ctx->screen->info.chip_class >= GFX9) {
                unsigned index = vtx_offset_param;

                switch (index / 2) {
                case 0:
                        vtx_offset = si_unpack_param(ctx, ctx->param_gs_vtx01_offset,
                                                  index % 2 ? 16 : 0, 16);
                        break;
                case 1:
                        vtx_offset = si_unpack_param(ctx, ctx->param_gs_vtx23_offset,
                                                  index % 2 ? 16 : 0, 16);
                        break;
                case 2:
                        vtx_offset = si_unpack_param(ctx, ctx->param_gs_vtx45_offset,
                                                  index % 2 ? 16 : 0, 16);
                        break;
                default:
                        assert(0);
                        return NULL;
                }

                vtx_offset = LLVMBuildAdd(ctx->ac.builder, vtx_offset,
                                          LLVMConstInt(ctx->i32, param * 4, 0), "");
                return lds_load(bld_base, type, swizzle, vtx_offset);
        }

        /* GFX6: input load from the ESGS ring in memory. */
        if (swizzle == ~0) {
                LLVMValueRef values[TGSI_NUM_CHANNELS];
                unsigned chan;
                for (chan = 0; chan < TGSI_NUM_CHANNELS; chan++) {
                        values[chan] = si_llvm_load_input_gs(abi, input_index, vtx_offset_param,
                                                             type, chan);
                }
                return ac_build_gather_values(&ctx->ac, values,
                                              TGSI_NUM_CHANNELS);
        }

        /* Get the vertex offset parameter on GFX6. */
        LLVMValueRef gs_vtx_offset = ctx->gs_vtx_offset[vtx_offset_param];

        vtx_offset = LLVMBuildMul(ctx->ac.builder, gs_vtx_offset,
                                  LLVMConstInt(ctx->i32, 4, 0), "");

        soffset = LLVMConstInt(ctx->i32, (param * 4 + swizzle) * 256, 0);

        value = ac_build_buffer_load(&ctx->ac, ctx->esgs_ring, 1, ctx->i32_0,
                                     vtx_offset, soffset, 0, 1, 0, true, false);
        if (llvm_type_is_64bit(ctx, type)) {
                LLVMValueRef value2;
                soffset = LLVMConstInt(ctx->i32, (param * 4 + swizzle + 1) * 256, 0);

                value2 = ac_build_buffer_load(&ctx->ac, ctx->esgs_ring, 1,
                                              ctx->i32_0, vtx_offset, soffset,
                                              0, 1, 0, true, false);
                return si_llvm_emit_fetch_64bit(bld_base, type, value, value2);
        }
        return LLVMBuildBitCast(ctx->ac.builder, value, type, "");
}

static LLVMValueRef si_nir_load_input_gs(struct ac_shader_abi *abi,
                                         unsigned location,
                                         unsigned driver_location,
                                         unsigned component,
                                         unsigned num_components,
                                         unsigned vertex_index,
                                         unsigned const_index,
                                         LLVMTypeRef type)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);

        LLVMValueRef value[4];
        for (unsigned i = 0; i < num_components; i++) {
                unsigned offset = i;
                if (llvm_type_is_64bit(ctx, type))
                        offset *= 2;

                offset += component;
                value[i + component] = si_llvm_load_input_gs(&ctx->abi, driver_location  / 4,
                                                             vertex_index, type, offset);
        }

        return ac_build_varying_gather_values(&ctx->ac, value, num_components, component);
}

static LLVMValueRef fetch_input_gs(
        struct lp_build_tgsi_context *bld_base,
        const struct tgsi_full_src_register *reg,
        enum tgsi_opcode_type type,
        unsigned swizzle_in)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        struct tgsi_shader_info *info = &ctx->shader->selector->info;
        unsigned swizzle = swizzle_in & 0xffff;

        unsigned semantic_name = info->input_semantic_name[reg->Register.Index];
        if (swizzle != ~0 && semantic_name == TGSI_SEMANTIC_PRIMID)
                return get_primitive_id(ctx, swizzle);

        if (!reg->Register.Dimension)
                return NULL;

        return si_llvm_load_input_gs(&ctx->abi, reg->Register.Index,
                                     reg->Dimension.Index,
                                     tgsi2llvmtype(bld_base, type),
                                     swizzle);
}

static int lookup_interp_param_index(unsigned interpolate, unsigned location)
{
        switch (interpolate) {
        case TGSI_INTERPOLATE_CONSTANT:
                return 0;

        case TGSI_INTERPOLATE_LINEAR:
                if (location == TGSI_INTERPOLATE_LOC_SAMPLE)
                        return SI_PARAM_LINEAR_SAMPLE;
                else if (location == TGSI_INTERPOLATE_LOC_CENTROID)
                        return SI_PARAM_LINEAR_CENTROID;
                else
                        return SI_PARAM_LINEAR_CENTER;
                break;
        case TGSI_INTERPOLATE_COLOR:
        case TGSI_INTERPOLATE_PERSPECTIVE:
                if (location == TGSI_INTERPOLATE_LOC_SAMPLE)
                        return SI_PARAM_PERSP_SAMPLE;
                else if (location == TGSI_INTERPOLATE_LOC_CENTROID)
                        return SI_PARAM_PERSP_CENTROID;
                else
                        return SI_PARAM_PERSP_CENTER;
                break;
        default:
                fprintf(stderr, "Warning: Unhandled interpolation mode.\n");
                return -1;
        }
}

static LLVMValueRef si_build_fs_interp(struct si_shader_context *ctx,
                                       unsigned attr_index, unsigned chan,
                                       LLVMValueRef prim_mask,
                                       LLVMValueRef i, LLVMValueRef j)
{
        if (i || j) {
                return ac_build_fs_interp(&ctx->ac,
                                          LLVMConstInt(ctx->i32, chan, 0),
                                          LLVMConstInt(ctx->i32, attr_index, 0),
                                          prim_mask, i, j);
        }
        return ac_build_fs_interp_mov(&ctx->ac,
                                      LLVMConstInt(ctx->i32, 2, 0), /* P0 */
                                      LLVMConstInt(ctx->i32, chan, 0),
                                      LLVMConstInt(ctx->i32, attr_index, 0),
                                      prim_mask);
}

/**
 * Interpolate a fragment shader input.
 *
 * @param ctx           context
 * @param input_index           index of the input in hardware
 * @param semantic_name         TGSI_SEMANTIC_*
 * @param semantic_index        semantic index
 * @param num_interp_inputs     number of all interpolated inputs (= BCOLOR offset)
 * @param colors_read_mask      color components read (4 bits for each color, 8 bits in total)
 * @param interp_param          interpolation weights (i,j)
 * @param prim_mask             SI_PARAM_PRIM_MASK
 * @param face                  SI_PARAM_FRONT_FACE
 * @param result                the return value (4 components)
 */
static void interp_fs_input(struct si_shader_context *ctx,
                            unsigned input_index,
                            unsigned semantic_name,
                            unsigned semantic_index,
                            unsigned num_interp_inputs,
                            unsigned colors_read_mask,
                            LLVMValueRef interp_param,
                            LLVMValueRef prim_mask,
                            LLVMValueRef face,
                            LLVMValueRef result[4])
{
        LLVMValueRef i = NULL, j = NULL;
        unsigned chan;

        /* fs.constant returns the param from the middle vertex, so it's not
         * really useful for flat shading. It's meant to be used for custom
         * interpolation (but the intrinsic can't fetch from the other two
         * vertices).
         *
         * Luckily, it doesn't matter, because we rely on the FLAT_SHADE state
         * to do the right thing. The only reason we use fs.constant is that
         * fs.interp cannot be used on integers, because they can be equal
         * to NaN.
         *
         * When interp is false we will use fs.constant or for newer llvm,
         * amdgcn.interp.mov.
         */
        bool interp = interp_param != NULL;

        if (interp) {
                interp_param = LLVMBuildBitCast(ctx->ac.builder, interp_param,
                                                LLVMVectorType(ctx->f32, 2), "");

                i = LLVMBuildExtractElement(ctx->ac.builder, interp_param,
                                                ctx->i32_0, "");
                j = LLVMBuildExtractElement(ctx->ac.builder, interp_param,
                                                ctx->i32_1, "");
        }

        if (semantic_name == TGSI_SEMANTIC_COLOR &&
            ctx->shader->key.part.ps.prolog.color_two_side) {
                LLVMValueRef is_face_positive;

                /* If BCOLOR0 is used, BCOLOR1 is at offset "num_inputs + 1",
                 * otherwise it's at offset "num_inputs".
                 */
                unsigned back_attr_offset = num_interp_inputs;
                if (semantic_index == 1 && colors_read_mask & 0xf)
                        back_attr_offset += 1;

                is_face_positive = LLVMBuildICmp(ctx->ac.builder, LLVMIntNE,
                                                 face, ctx->i32_0, "");

                for (chan = 0; chan < TGSI_NUM_CHANNELS; chan++) {
                        LLVMValueRef front, back;

                        front = si_build_fs_interp(ctx,
                                                   input_index, chan,
                                                   prim_mask, i, j);
                        back = si_build_fs_interp(ctx,
                                                  back_attr_offset, chan,
                                                  prim_mask, i, j);

                        result[chan] = LLVMBuildSelect(ctx->ac.builder,
                                                is_face_positive,
                                                front,
                                                back,
                                                "");
                }
        } else if (semantic_name == TGSI_SEMANTIC_FOG) {
                result[0] = si_build_fs_interp(ctx, input_index,
                                               0, prim_mask, i, j);
                result[1] =
                result[2] = LLVMConstReal(ctx->f32, 0.0f);
                result[3] = LLVMConstReal(ctx->f32, 1.0f);
        } else {
                for (chan = 0; chan < TGSI_NUM_CHANNELS; chan++) {
                        result[chan] = si_build_fs_interp(ctx,
                                                          input_index, chan,
                                                          prim_mask, i, j);
                }
        }
}

void si_llvm_load_input_fs(
        struct si_shader_context *ctx,
        unsigned input_index,
        LLVMValueRef out[4])
{
        struct si_shader *shader = ctx->shader;
        struct tgsi_shader_info *info = &shader->selector->info;
        LLVMValueRef main_fn = ctx->main_fn;
        LLVMValueRef interp_param = NULL;
        int interp_param_idx;
        enum tgsi_semantic semantic_name = info->input_semantic_name[input_index];
        unsigned semantic_index = info->input_semantic_index[input_index];
        enum tgsi_interpolate_mode interp_mode = info->input_interpolate[input_index];
        enum tgsi_interpolate_loc interp_loc = info->input_interpolate_loc[input_index];

        /* Get colors from input VGPRs (set by the prolog). */
        if (semantic_name == TGSI_SEMANTIC_COLOR) {
                unsigned colors_read = shader->selector->info.colors_read;
                unsigned mask = colors_read >> (semantic_index * 4);
                unsigned offset = SI_PARAM_POS_FIXED_PT + 1 +
                                  (semantic_index ? util_bitcount(colors_read & 0xf) : 0);
                LLVMValueRef undef = LLVMGetUndef(ctx->f32);

                out[0] = mask & 0x1 ? LLVMGetParam(main_fn, offset++) : undef;
                out[1] = mask & 0x2 ? LLVMGetParam(main_fn, offset++) : undef;
                out[2] = mask & 0x4 ? LLVMGetParam(main_fn, offset++) : undef;
                out[3] = mask & 0x8 ? LLVMGetParam(main_fn, offset++) : undef;
                return;
        }

        interp_param_idx = lookup_interp_param_index(interp_mode, interp_loc);
        if (interp_param_idx == -1)
                return;
        else if (interp_param_idx) {
                interp_param = LLVMGetParam(ctx->main_fn, interp_param_idx);
        }

        interp_fs_input(ctx, input_index, semantic_name,
                        semantic_index, 0, /* this param is unused */
                        shader->selector->info.colors_read, interp_param,
                        ctx->abi.prim_mask,
                        LLVMGetParam(main_fn, SI_PARAM_FRONT_FACE),
                        &out[0]);
}

static void declare_input_fs(
        struct si_shader_context *ctx,
        unsigned input_index,
        const struct tgsi_full_declaration *decl,
        LLVMValueRef out[4])
{
        si_llvm_load_input_fs(ctx, input_index, out);
}

LLVMValueRef si_get_sample_id(struct si_shader_context *ctx)
{
        return si_unpack_param(ctx, SI_PARAM_ANCILLARY, 8, 4);
}

static LLVMValueRef get_base_vertex(struct ac_shader_abi *abi)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);

        /* For non-indexed draws, the base vertex set by the driver
         * (for direct draws) or the CP (for indirect draws) is the
         * first vertex ID, but GLSL expects 0 to be returned.
         */
        LLVMValueRef vs_state = LLVMGetParam(ctx->main_fn,
                                             ctx->param_vs_state_bits);
        LLVMValueRef indexed;

        indexed = LLVMBuildLShr(ctx->ac.builder, vs_state, ctx->i32_1, "");
        indexed = LLVMBuildTrunc(ctx->ac.builder, indexed, ctx->i1, "");

        return LLVMBuildSelect(ctx->ac.builder, indexed, ctx->abi.base_vertex,
                               ctx->i32_0, "");
}

static LLVMValueRef get_block_size(struct ac_shader_abi *abi)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);

        LLVMValueRef values[3];
        LLVMValueRef result;
        unsigned i;
        unsigned *properties = ctx->shader->selector->info.properties;

        if (properties[TGSI_PROPERTY_CS_FIXED_BLOCK_WIDTH] != 0) {
                unsigned sizes[3] = {
                        properties[TGSI_PROPERTY_CS_FIXED_BLOCK_WIDTH],
                        properties[TGSI_PROPERTY_CS_FIXED_BLOCK_HEIGHT],
                        properties[TGSI_PROPERTY_CS_FIXED_BLOCK_DEPTH]
                };

                for (i = 0; i < 3; ++i)
                        values[i] = LLVMConstInt(ctx->i32, sizes[i], 0);

                result = ac_build_gather_values(&ctx->ac, values, 3);
        } else {
                result = LLVMGetParam(ctx->main_fn, ctx->param_block_size);
        }

        return result;
}

/**
 * Load a dword from a constant buffer.
 */
static LLVMValueRef buffer_load_const(struct si_shader_context *ctx,
                                      LLVMValueRef resource,
                                      LLVMValueRef offset)
{
        return ac_build_buffer_load(&ctx->ac, resource, 1, NULL, offset, NULL,
                                    0, 0, 0, true, true);
}

static LLVMValueRef load_sample_position(struct ac_shader_abi *abi, LLVMValueRef sample_id)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        LLVMValueRef desc = LLVMGetParam(ctx->main_fn, ctx->param_rw_buffers);
        LLVMValueRef buf_index = LLVMConstInt(ctx->i32, SI_PS_CONST_SAMPLE_POSITIONS, 0);
        LLVMValueRef resource = ac_build_load_to_sgpr(&ctx->ac, desc, buf_index);

        /* offset = sample_id * 8  (8 = 2 floats containing samplepos.xy) */
        LLVMValueRef offset0 = LLVMBuildMul(ctx->ac.builder, sample_id, LLVMConstInt(ctx->i32, 8, 0), "");
        LLVMValueRef offset1 = LLVMBuildAdd(ctx->ac.builder, offset0, LLVMConstInt(ctx->i32, 4, 0), "");

        LLVMValueRef pos[4] = {
                buffer_load_const(ctx, resource, offset0),
                buffer_load_const(ctx, resource, offset1),
                LLVMConstReal(ctx->f32, 0),
                LLVMConstReal(ctx->f32, 0)
        };

        return ac_build_gather_values(&ctx->ac, pos, 4);
}

static LLVMValueRef load_sample_mask_in(struct ac_shader_abi *abi)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        return ac_to_integer(&ctx->ac, abi->sample_coverage);
}

static LLVMValueRef si_load_tess_coord(struct ac_shader_abi *abi)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        LLVMValueRef coord[4] = {
                LLVMGetParam(ctx->main_fn, ctx->param_tes_u),
                LLVMGetParam(ctx->main_fn, ctx->param_tes_v),
                ctx->ac.f32_0,
                ctx->ac.f32_0
        };

        /* For triangles, the vector should be (u, v, 1-u-v). */
        if (ctx->shader->selector->info.properties[TGSI_PROPERTY_TES_PRIM_MODE] ==
            PIPE_PRIM_TRIANGLES) {
                coord[2] = LLVMBuildFSub(ctx->ac.builder, ctx->ac.f32_1,
                                         LLVMBuildFAdd(ctx->ac.builder,
                                                       coord[0], coord[1], ""), "");
        }
        return ac_build_gather_values(&ctx->ac, coord, 4);
}

static LLVMValueRef load_tess_level(struct si_shader_context *ctx,
                                    unsigned semantic_name)
{
        LLVMValueRef base, addr;

        int param = si_shader_io_get_unique_index_patch(semantic_name, 0);

        base = LLVMGetParam(ctx->main_fn, ctx->param_tcs_offchip_offset);
        addr = get_tcs_tes_buffer_address(ctx, get_rel_patch_id(ctx), NULL,
                                          LLVMConstInt(ctx->i32, param, 0));

        return buffer_load(&ctx->bld_base, ctx->f32,
                           ~0, ctx->tess_offchip_ring, base, addr, true);

}

static LLVMValueRef si_load_tess_level(struct ac_shader_abi *abi,
                                       unsigned varying_id)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        unsigned semantic_name;

        switch (varying_id) {
        case VARYING_SLOT_TESS_LEVEL_INNER:
                semantic_name = TGSI_SEMANTIC_TESSINNER;
                break;
        case VARYING_SLOT_TESS_LEVEL_OUTER:
                semantic_name = TGSI_SEMANTIC_TESSOUTER;
                break;
        default:
                unreachable("unknown tess level");
        }

        return load_tess_level(ctx, semantic_name);

}

static LLVMValueRef si_load_patch_vertices_in(struct ac_shader_abi *abi)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        if (ctx->type == PIPE_SHADER_TESS_CTRL)
                return si_unpack_param(ctx, ctx->param_tcs_out_lds_layout, 13, 6);
        else if (ctx->type == PIPE_SHADER_TESS_EVAL)
                return get_num_tcs_out_vertices(ctx);
        else
                unreachable("invalid shader stage for TGSI_SEMANTIC_VERTICESIN");
}

void si_load_system_value(struct si_shader_context *ctx,
                          unsigned index,
                          const struct tgsi_full_declaration *decl)
{
        LLVMValueRef value = 0;

        assert(index < RADEON_LLVM_MAX_SYSTEM_VALUES);

        switch (decl->Semantic.Name) {
        case TGSI_SEMANTIC_INSTANCEID:
                value = ctx->abi.instance_id;
                break;

        case TGSI_SEMANTIC_VERTEXID:
                value = LLVMBuildAdd(ctx->ac.builder,
                                     ctx->abi.vertex_id,
                                     ctx->abi.base_vertex, "");
                break;

        case TGSI_SEMANTIC_VERTEXID_NOBASE:
                /* Unused. Clarify the meaning in indexed vs. non-indexed
                 * draws if this is ever used again. */
                assert(false);
                break;

        case TGSI_SEMANTIC_BASEVERTEX:
                value = get_base_vertex(&ctx->abi);
                break;

        case TGSI_SEMANTIC_BASEINSTANCE:
                value = ctx->abi.start_instance;
                break;

        case TGSI_SEMANTIC_DRAWID:
                value = ctx->abi.draw_id;
                break;

        case TGSI_SEMANTIC_INVOCATIONID:
                if (ctx->type == PIPE_SHADER_TESS_CTRL)
                        value = unpack_llvm_param(ctx, ctx->abi.tcs_rel_ids, 8, 5);
                else if (ctx->type == PIPE_SHADER_GEOMETRY)
                        value = ctx->abi.gs_invocation_id;
                else
                        assert(!"INVOCATIONID not implemented");
                break;

        case TGSI_SEMANTIC_POSITION:
        {
                LLVMValueRef pos[4] = {
                        LLVMGetParam(ctx->main_fn, SI_PARAM_POS_X_FLOAT),
                        LLVMGetParam(ctx->main_fn, SI_PARAM_POS_Y_FLOAT),
                        LLVMGetParam(ctx->main_fn, SI_PARAM_POS_Z_FLOAT),
                        ac_build_fdiv(&ctx->ac, ctx->ac.f32_1,
                                      LLVMGetParam(ctx->main_fn, SI_PARAM_POS_W_FLOAT)),
                };
                value = ac_build_gather_values(&ctx->ac, pos, 4);
                break;
        }

        case TGSI_SEMANTIC_FACE:
                value = ctx->abi.front_face;
                break;

        case TGSI_SEMANTIC_SAMPLEID:
                value = si_get_sample_id(ctx);
                break;

        case TGSI_SEMANTIC_SAMPLEPOS: {
                LLVMValueRef pos[4] = {
                        LLVMGetParam(ctx->main_fn, SI_PARAM_POS_X_FLOAT),
                        LLVMGetParam(ctx->main_fn, SI_PARAM_POS_Y_FLOAT),
                        LLVMConstReal(ctx->f32, 0),
                        LLVMConstReal(ctx->f32, 0)
                };
                pos[0] = ac_build_fract(&ctx->ac, pos[0], 32);
                pos[1] = ac_build_fract(&ctx->ac, pos[1], 32);
                value = ac_build_gather_values(&ctx->ac, pos, 4);
                break;
        }

        case TGSI_SEMANTIC_SAMPLEMASK:
                /* This can only occur with the OpenGL Core profile, which
                 * doesn't support smoothing.
                 */
                value = LLVMGetParam(ctx->main_fn, SI_PARAM_SAMPLE_COVERAGE);
                break;

        case TGSI_SEMANTIC_TESSCOORD:
                value = si_load_tess_coord(&ctx->abi);
                break;

        case TGSI_SEMANTIC_VERTICESIN:
                value = si_load_patch_vertices_in(&ctx->abi);
                break;

        case TGSI_SEMANTIC_TESSINNER:
        case TGSI_SEMANTIC_TESSOUTER:
                value = load_tess_level(ctx, decl->Semantic.Name);
                break;

        case TGSI_SEMANTIC_DEFAULT_TESSOUTER_SI:
        case TGSI_SEMANTIC_DEFAULT_TESSINNER_SI:
        {
                LLVMValueRef buf, slot, val[4];
                int i, offset;

                slot = LLVMConstInt(ctx->i32, SI_HS_CONST_DEFAULT_TESS_LEVELS, 0);
                buf = LLVMGetParam(ctx->main_fn, ctx->param_rw_buffers);
                buf = ac_build_load_to_sgpr(&ctx->ac, buf, slot);
                offset = decl->Semantic.Name == TGSI_SEMANTIC_DEFAULT_TESSINNER_SI ? 4 : 0;

                for (i = 0; i < 4; i++)
                        val[i] = buffer_load_const(ctx, buf,
                                                   LLVMConstInt(ctx->i32, (offset + i) * 4, 0));
                value = ac_build_gather_values(&ctx->ac, val, 4);
                break;
        }

        case TGSI_SEMANTIC_PRIMID:
                value = get_primitive_id(ctx, 0);
                break;

        case TGSI_SEMANTIC_GRID_SIZE:
                value = ctx->abi.num_work_groups;
                break;

        case TGSI_SEMANTIC_BLOCK_SIZE:
                value = get_block_size(&ctx->abi);
                break;

        case TGSI_SEMANTIC_BLOCK_ID:
        {
                LLVMValueRef values[3];

                for (int i = 0; i < 3; i++) {
                        values[i] = ctx->i32_0;
                        if (ctx->abi.workgroup_ids[i]) {
                                values[i] = ctx->abi.workgroup_ids[i];
                        }
                }
                value = ac_build_gather_values(&ctx->ac, values, 3);
                break;
        }

        case TGSI_SEMANTIC_THREAD_ID:
                value = ctx->abi.local_invocation_ids;
                break;

        case TGSI_SEMANTIC_HELPER_INVOCATION:
                value = ac_build_load_helper_invocation(&ctx->ac);
                break;

        case TGSI_SEMANTIC_SUBGROUP_SIZE:
                value = LLVMConstInt(ctx->i32, 64, 0);
                break;

        case TGSI_SEMANTIC_SUBGROUP_INVOCATION:
                value = ac_get_thread_id(&ctx->ac);
                break;

        case TGSI_SEMANTIC_SUBGROUP_EQ_MASK:
        {
                LLVMValueRef id = ac_get_thread_id(&ctx->ac);
                id = LLVMBuildZExt(ctx->ac.builder, id, ctx->i64, "");
                value = LLVMBuildShl(ctx->ac.builder, LLVMConstInt(ctx->i64, 1, 0), id, "");
                value = LLVMBuildBitCast(ctx->ac.builder, value, ctx->v2i32, "");
                break;
        }

        case TGSI_SEMANTIC_SUBGROUP_GE_MASK:
        case TGSI_SEMANTIC_SUBGROUP_GT_MASK:
        case TGSI_SEMANTIC_SUBGROUP_LE_MASK:
        case TGSI_SEMANTIC_SUBGROUP_LT_MASK:
        {
                LLVMValueRef id = ac_get_thread_id(&ctx->ac);
                if (decl->Semantic.Name == TGSI_SEMANTIC_SUBGROUP_GT_MASK ||
                    decl->Semantic.Name == TGSI_SEMANTIC_SUBGROUP_LE_MASK) {
                        /* All bits set except LSB */
                        value = LLVMConstInt(ctx->i64, -2, 0);
                } else {
                        /* All bits set */
                        value = LLVMConstInt(ctx->i64, -1, 0);
                }
                id = LLVMBuildZExt(ctx->ac.builder, id, ctx->i64, "");
                value = LLVMBuildShl(ctx->ac.builder, value, id, "");
                if (decl->Semantic.Name == TGSI_SEMANTIC_SUBGROUP_LE_MASK ||
                    decl->Semantic.Name == TGSI_SEMANTIC_SUBGROUP_LT_MASK)
                        value = LLVMBuildNot(ctx->ac.builder, value, "");
                value = LLVMBuildBitCast(ctx->ac.builder, value, ctx->v2i32, "");
                break;
        }

        case TGSI_SEMANTIC_CS_USER_DATA:
                value = LLVMGetParam(ctx->main_fn, ctx->param_cs_user_data);
                break;

        default:
                assert(!"unknown system value");
                return;
        }

        ctx->system_values[index] = value;
}

void si_declare_compute_memory(struct si_shader_context *ctx)
{
        struct si_shader_selector *sel = ctx->shader->selector;
        unsigned lds_size = sel->info.properties[TGSI_PROPERTY_CS_LOCAL_SIZE];

        LLVMTypeRef i8p = LLVMPointerType(ctx->i8, AC_ADDR_SPACE_LDS);
        LLVMValueRef var;

        assert(!ctx->ac.lds);

        var = LLVMAddGlobalInAddressSpace(ctx->ac.module,
                                          LLVMArrayType(ctx->i8, lds_size),
                                          "compute_lds",
                                          AC_ADDR_SPACE_LDS);
        LLVMSetAlignment(var, 4);

        ctx->ac.lds = LLVMBuildBitCast(ctx->ac.builder, var, i8p, "");
}

void si_tgsi_declare_compute_memory(struct si_shader_context *ctx,
                                    const struct tgsi_full_declaration *decl)
{
        assert(decl->Declaration.MemType == TGSI_MEMORY_TYPE_SHARED);
        assert(decl->Range.First == decl->Range.Last);

        si_declare_compute_memory(ctx);
}

static LLVMValueRef load_const_buffer_desc_fast_path(struct si_shader_context *ctx)
{
        LLVMValueRef ptr =
                LLVMGetParam(ctx->main_fn, ctx->param_const_and_shader_buffers);
        struct si_shader_selector *sel = ctx->shader->selector;

        /* Do the bounds checking with a descriptor, because
         * doing computation and manual bounds checking of 64-bit
         * addresses generates horrible VALU code with very high
         * VGPR usage and very low SIMD occupancy.
         */
        ptr = LLVMBuildPtrToInt(ctx->ac.builder, ptr, ctx->ac.intptr, "");

        LLVMValueRef desc0, desc1;
        desc0 = ptr;
        desc1 = LLVMConstInt(ctx->i32,
                             S_008F04_BASE_ADDRESS_HI(ctx->screen->info.address32_hi), 0);

        LLVMValueRef desc_elems[] = {
                desc0,
                desc1,
                LLVMConstInt(ctx->i32, (sel->info.const_file_max[0] + 1) * 16, 0),
                LLVMConstInt(ctx->i32,
                        S_008F0C_DST_SEL_X(V_008F0C_SQ_SEL_X) |
                        S_008F0C_DST_SEL_Y(V_008F0C_SQ_SEL_Y) |
                        S_008F0C_DST_SEL_Z(V_008F0C_SQ_SEL_Z) |
                        S_008F0C_DST_SEL_W(V_008F0C_SQ_SEL_W) |
                        S_008F0C_NUM_FORMAT(V_008F0C_BUF_NUM_FORMAT_FLOAT) |
                        S_008F0C_DATA_FORMAT(V_008F0C_BUF_DATA_FORMAT_32), 0)
        };

        return ac_build_gather_values(&ctx->ac, desc_elems, 4);
}

static LLVMValueRef load_const_buffer_desc(struct si_shader_context *ctx, int i)
{
        LLVMValueRef list_ptr = LLVMGetParam(ctx->main_fn,
                                             ctx->param_const_and_shader_buffers);

        return ac_build_load_to_sgpr(&ctx->ac, list_ptr,
                                     LLVMConstInt(ctx->i32, si_get_constbuf_slot(i), 0));
}

static LLVMValueRef load_ubo(struct ac_shader_abi *abi, LLVMValueRef index)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        struct si_shader_selector *sel = ctx->shader->selector;

        LLVMValueRef ptr = LLVMGetParam(ctx->main_fn, ctx->param_const_and_shader_buffers);

        if (sel->info.const_buffers_declared == 1 &&
            sel->info.shader_buffers_declared == 0) {
                return load_const_buffer_desc_fast_path(ctx);
        }

        index = si_llvm_bound_index(ctx, index, ctx->num_const_buffers);
        index = LLVMBuildAdd(ctx->ac.builder, index,
                             LLVMConstInt(ctx->i32, SI_NUM_SHADER_BUFFERS, 0), "");

        return ac_build_load_to_sgpr(&ctx->ac, ptr, index);
}

static LLVMValueRef
load_ssbo(struct ac_shader_abi *abi, LLVMValueRef index, bool write)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        LLVMValueRef rsrc_ptr = LLVMGetParam(ctx->main_fn,
                                             ctx->param_const_and_shader_buffers);

        index = si_llvm_bound_index(ctx, index, ctx->num_shader_buffers);
        index = LLVMBuildSub(ctx->ac.builder,
                             LLVMConstInt(ctx->i32, SI_NUM_SHADER_BUFFERS - 1, 0),
                             index, "");

        return ac_build_load_to_sgpr(&ctx->ac, rsrc_ptr, index);
}

static LLVMValueRef fetch_constant(
        struct lp_build_tgsi_context *bld_base,
        const struct tgsi_full_src_register *reg,
        enum tgsi_opcode_type type,
        unsigned swizzle_in)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        struct si_shader_selector *sel = ctx->shader->selector;
        const struct tgsi_ind_register *ireg = &reg->Indirect;
        unsigned buf, idx;
        unsigned swizzle = swizzle_in & 0xffff;

        LLVMValueRef addr, bufp;

        if (swizzle_in == LP_CHAN_ALL) {
                unsigned chan;
                LLVMValueRef values[4];
                for (chan = 0; chan < TGSI_NUM_CHANNELS; ++chan)
                        values[chan] = fetch_constant(bld_base, reg, type, chan);

                return ac_build_gather_values(&ctx->ac, values, 4);
        }

        /* Split 64-bit loads. */
        if (tgsi_type_is_64bit(type)) {
                LLVMValueRef lo, hi;

                lo = fetch_constant(bld_base, reg, TGSI_TYPE_UNSIGNED, swizzle);
                hi = fetch_constant(bld_base, reg, TGSI_TYPE_UNSIGNED, (swizzle_in >> 16));
                return si_llvm_emit_fetch_64bit(bld_base, tgsi2llvmtype(bld_base, type),
                                                lo, hi);
        }

        idx = reg->Register.Index * 4 + swizzle;
        if (reg->Register.Indirect) {
                addr = si_get_indirect_index(ctx, ireg, 16, idx * 4);
        } else {
                addr = LLVMConstInt(ctx->i32, idx * 4, 0);
        }

        /* Fast path when user data SGPRs point to constant buffer 0 directly. */
        if (sel->info.const_buffers_declared == 1 &&
            sel->info.shader_buffers_declared == 0) {
                LLVMValueRef desc = load_const_buffer_desc_fast_path(ctx);
                LLVMValueRef result = buffer_load_const(ctx, desc, addr);
                return bitcast(bld_base, type, result);
        }

        assert(reg->Register.Dimension);
        buf = reg->Dimension.Index;

        if (reg->Dimension.Indirect) {
                LLVMValueRef ptr = LLVMGetParam(ctx->main_fn, ctx->param_const_and_shader_buffers);
                LLVMValueRef index;
                index = si_get_bounded_indirect_index(ctx, &reg->DimIndirect,
                                                      reg->Dimension.Index,
                                                      ctx->num_const_buffers);
                index = LLVMBuildAdd(ctx->ac.builder, index,
                                     LLVMConstInt(ctx->i32, SI_NUM_SHADER_BUFFERS, 0), "");
                bufp = ac_build_load_to_sgpr(&ctx->ac, ptr, index);
        } else
                bufp = load_const_buffer_desc(ctx, buf);

        return bitcast(bld_base, type, buffer_load_const(ctx, bufp, addr));
}

/* Initialize arguments for the shader export intrinsic */
static void si_llvm_init_export_args(struct si_shader_context *ctx,
                                     LLVMValueRef *values,
                                     unsigned target,
                                     struct ac_export_args *args)
{
        LLVMValueRef f32undef = LLVMGetUndef(ctx->ac.f32);
        unsigned spi_shader_col_format = V_028714_SPI_SHADER_32_ABGR;
        unsigned chan;
        bool is_int8, is_int10;

        /* Default is 0xf. Adjusted below depending on the format. */
        args->enabled_channels = 0xf; /* writemask */

        /* Specify whether the EXEC mask represents the valid mask */
        args->valid_mask = 0;

        /* Specify whether this is the last export */
        args->done = 0;

        /* Specify the target we are exporting */
        args->target = target;

        if (ctx->type == PIPE_SHADER_FRAGMENT) {
                const struct si_shader_key *key = &ctx->shader->key;
                unsigned col_formats = key->part.ps.epilog.spi_shader_col_format;
                int cbuf = target - V_008DFC_SQ_EXP_MRT;

                assert(cbuf >= 0 && cbuf < 8);
                spi_shader_col_format = (col_formats >> (cbuf * 4)) & 0xf;
                is_int8 = (key->part.ps.epilog.color_is_int8 >> cbuf) & 0x1;
                is_int10 = (key->part.ps.epilog.color_is_int10 >> cbuf) & 0x1;
        }

        args->compr = false;
        args->out[0] = f32undef;
        args->out[1] = f32undef;
        args->out[2] = f32undef;
        args->out[3] = f32undef;

        LLVMValueRef (*packf)(struct ac_llvm_context *ctx, LLVMValueRef args[2]) = NULL;
        LLVMValueRef (*packi)(struct ac_llvm_context *ctx, LLVMValueRef args[2],
                              unsigned bits, bool hi) = NULL;

        switch (spi_shader_col_format) {
        case V_028714_SPI_SHADER_ZERO:
                args->enabled_channels = 0; /* writemask */
                args->target = V_008DFC_SQ_EXP_NULL;
                break;

        case V_028714_SPI_SHADER_32_R:
                args->enabled_channels = 1; /* writemask */
                args->out[0] = values[0];
                break;

        case V_028714_SPI_SHADER_32_GR:
                args->enabled_channels = 0x3; /* writemask */
                args->out[0] = values[0];
                args->out[1] = values[1];
                break;

        case V_028714_SPI_SHADER_32_AR:
                args->enabled_channels = 0x9; /* writemask */
                args->out[0] = values[0];
                args->out[3] = values[3];
                break;

        case V_028714_SPI_SHADER_FP16_ABGR:
                packf = ac_build_cvt_pkrtz_f16;
                break;

        case V_028714_SPI_SHADER_UNORM16_ABGR:
                packf = ac_build_cvt_pknorm_u16;
                break;

        case V_028714_SPI_SHADER_SNORM16_ABGR:
                packf = ac_build_cvt_pknorm_i16;
                break;

        case V_028714_SPI_SHADER_UINT16_ABGR:
                packi = ac_build_cvt_pk_u16;
                break;

        case V_028714_SPI_SHADER_SINT16_ABGR:
                packi = ac_build_cvt_pk_i16;
                break;

        case V_028714_SPI_SHADER_32_ABGR:
                memcpy(&args->out[0], values, sizeof(values[0]) * 4);
                break;
        }

        /* Pack f16 or norm_i16/u16. */
        if (packf) {
                for (chan = 0; chan < 2; chan++) {
                        LLVMValueRef pack_args[2] = {
                                values[2 * chan],
                                values[2 * chan + 1]
                        };
                        LLVMValueRef packed;

                        packed = packf(&ctx->ac, pack_args);
                        args->out[chan] = ac_to_float(&ctx->ac, packed);
                }
                args->compr = 1; /* COMPR flag */
        }
        /* Pack i16/u16. */
        if (packi) {
                for (chan = 0; chan < 2; chan++) {
                        LLVMValueRef pack_args[2] = {
                                ac_to_integer(&ctx->ac, values[2 * chan]),
                                ac_to_integer(&ctx->ac, values[2 * chan + 1])
                        };
                        LLVMValueRef packed;

                        packed = packi(&ctx->ac, pack_args,
                                       is_int8 ? 8 : is_int10 ? 10 : 16,
                                       chan == 1);
                        args->out[chan] = ac_to_float(&ctx->ac, packed);
                }
                args->compr = 1; /* COMPR flag */
        }
}

static void si_alpha_test(struct lp_build_tgsi_context *bld_base,
                          LLVMValueRef alpha)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);

        if (ctx->shader->key.part.ps.epilog.alpha_func != PIPE_FUNC_NEVER) {
                static LLVMRealPredicate cond_map[PIPE_FUNC_ALWAYS + 1] = {
                        [PIPE_FUNC_LESS] = LLVMRealOLT,
                        [PIPE_FUNC_EQUAL] = LLVMRealOEQ,
                        [PIPE_FUNC_LEQUAL] = LLVMRealOLE,
                        [PIPE_FUNC_GREATER] = LLVMRealOGT,
                        [PIPE_FUNC_NOTEQUAL] = LLVMRealONE,
                        [PIPE_FUNC_GEQUAL] = LLVMRealOGE,
                };
                LLVMRealPredicate cond = cond_map[ctx->shader->key.part.ps.epilog.alpha_func];
                assert(cond);

                LLVMValueRef alpha_ref = LLVMGetParam(ctx->main_fn,
                                SI_PARAM_ALPHA_REF);
                LLVMValueRef alpha_pass =
                        LLVMBuildFCmp(ctx->ac.builder, cond, alpha, alpha_ref, "");
                ac_build_kill_if_false(&ctx->ac, alpha_pass);
        } else {
                ac_build_kill_if_false(&ctx->ac, ctx->i1false);
        }
}

static LLVMValueRef si_scale_alpha_by_sample_mask(struct lp_build_tgsi_context *bld_base,
                                                  LLVMValueRef alpha,
                                                  unsigned samplemask_param)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        LLVMValueRef coverage;

        /* alpha = alpha * popcount(coverage) / SI_NUM_SMOOTH_AA_SAMPLES */
        coverage = LLVMGetParam(ctx->main_fn,
                                samplemask_param);
        coverage = ac_to_integer(&ctx->ac, coverage);

        coverage = ac_build_intrinsic(&ctx->ac, "llvm.ctpop.i32",
                                   ctx->i32,
                                   &coverage, 1, AC_FUNC_ATTR_READNONE);

        coverage = LLVMBuildUIToFP(ctx->ac.builder, coverage,
                                   ctx->f32, "");

        coverage = LLVMBuildFMul(ctx->ac.builder, coverage,
                                 LLVMConstReal(ctx->f32,
                                        1.0 / SI_NUM_SMOOTH_AA_SAMPLES), "");

        return LLVMBuildFMul(ctx->ac.builder, alpha, coverage, "");
}

static void si_llvm_emit_clipvertex(struct si_shader_context *ctx,
                                    struct ac_export_args *pos, LLVMValueRef *out_elts)
{
        unsigned reg_index;
        unsigned chan;
        unsigned const_chan;
        LLVMValueRef base_elt;
        LLVMValueRef ptr = LLVMGetParam(ctx->main_fn, ctx->param_rw_buffers);
        LLVMValueRef constbuf_index = LLVMConstInt(ctx->i32,
                                                   SI_VS_CONST_CLIP_PLANES, 0);
        LLVMValueRef const_resource = ac_build_load_to_sgpr(&ctx->ac, ptr, constbuf_index);

        for (reg_index = 0; reg_index < 2; reg_index ++) {
                struct ac_export_args *args = &pos[2 + reg_index];

                args->out[0] =
                args->out[1] =
                args->out[2] =
                args->out[3] = LLVMConstReal(ctx->f32, 0.0f);

                /* Compute dot products of position and user clip plane vectors */
                for (chan = 0; chan < TGSI_NUM_CHANNELS; chan++) {
                        for (const_chan = 0; const_chan < TGSI_NUM_CHANNELS; const_chan++) {
                                LLVMValueRef addr =
                                        LLVMConstInt(ctx->i32, ((reg_index * 4 + chan) * 4 +
                                                                const_chan) * 4, 0);
                                base_elt = buffer_load_const(ctx, const_resource,
                                                             addr);
                                args->out[chan] = ac_build_fmad(&ctx->ac, base_elt,
                                                                out_elts[const_chan], args->out[chan]);
                        }
                }

                args->enabled_channels = 0xf;
                args->valid_mask = 0;
                args->done = 0;
                args->target = V_008DFC_SQ_EXP_POS + 2 + reg_index;
                args->compr = 0;
        }
}

static void si_dump_streamout(struct pipe_stream_output_info *so)
{
        unsigned i;

        if (so->num_outputs)
                fprintf(stderr, "STREAMOUT\n");

        for (i = 0; i < so->num_outputs; i++) {
                unsigned mask = ((1 << so->output[i].num_components) - 1) <<
                                so->output[i].start_component;
                fprintf(stderr, "  %i: BUF%i[%i..%i] <- OUT[%i].%s%s%s%s\n",
                        i, so->output[i].output_buffer,
                        so->output[i].dst_offset, so->output[i].dst_offset + so->output[i].num_components - 1,
                        so->output[i].register_index,
                        mask & 1 ? "x" : "",
                        mask & 2 ? "y" : "",
                        mask & 4 ? "z" : "",
                        mask & 8 ? "w" : "");
        }
}

static void emit_streamout_output(struct si_shader_context *ctx,
                                  LLVMValueRef const *so_buffers,
                                  LLVMValueRef const *so_write_offsets,
                                  struct pipe_stream_output *stream_out,
                                  struct si_shader_output_values *shader_out)
{
        unsigned buf_idx = stream_out->output_buffer;
        unsigned start = stream_out->start_component;
        unsigned num_comps = stream_out->num_components;
        LLVMValueRef out[4];

        assert(num_comps && num_comps <= 4);
        if (!num_comps || num_comps > 4)
                return;

        /* Load the output as int. */
        for (int j = 0; j < num_comps; j++) {
                assert(stream_out->stream == shader_out->vertex_stream[start + j]);

                out[j] = ac_to_integer(&ctx->ac, shader_out->values[start + j]);
        }

        /* Pack the output. */
        LLVMValueRef vdata = NULL;

        switch (num_comps) {
        case 1: /* as i32 */
                vdata = out[0];
                break;
        case 2: /* as v2i32 */
        case 3: /* as v4i32 (aligned to 4) */
                out[3] = LLVMGetUndef(ctx->i32);
                /* fall through */
        case 4: /* as v4i32 */
                vdata = ac_build_gather_values(&ctx->ac, out, util_next_power_of_two(num_comps));
                break;
        }

        ac_build_buffer_store_dword(&ctx->ac, so_buffers[buf_idx],
                                    vdata, num_comps,
                                    so_write_offsets[buf_idx],
                                    ctx->i32_0,
                                    stream_out->dst_offset * 4, 1, 1, true, false);
}

/**
 * Write streamout data to buffers for vertex stream @p stream (different
 * vertex streams can occur for GS copy shaders).
 */
static void si_llvm_emit_streamout(struct si_shader_context *ctx,
                                   struct si_shader_output_values *outputs,
                                   unsigned noutput, unsigned stream)
{
        struct si_shader_selector *sel = ctx->shader->selector;
        struct pipe_stream_output_info *so = &sel->so;
        LLVMBuilderRef builder = ctx->ac.builder;
        int i;
        struct lp_build_if_state if_ctx;

        /* Get bits [22:16], i.e. (so_param >> 16) & 127; */
        LLVMValueRef so_vtx_count =
                si_unpack_param(ctx, ctx->param_streamout_config, 16, 7);

        LLVMValueRef tid = ac_get_thread_id(&ctx->ac);

        /* can_emit = tid < so_vtx_count; */
        LLVMValueRef can_emit =
                LLVMBuildICmp(builder, LLVMIntULT, tid, so_vtx_count, "");

        /* Emit the streamout code conditionally. This actually avoids
         * out-of-bounds buffer access. The hw tells us via the SGPR
         * (so_vtx_count) which threads are allowed to emit streamout data. */
        lp_build_if(&if_ctx, &ctx->gallivm, can_emit);
        {
                /* The buffer offset is computed as follows:
                 *   ByteOffset = streamout_offset[buffer_id]*4 +
                 *                (streamout_write_index + thread_id)*stride[buffer_id] +
                 *                attrib_offset
                 */

                LLVMValueRef so_write_index =
                        LLVMGetParam(ctx->main_fn,
                                     ctx->param_streamout_write_index);

                /* Compute (streamout_write_index + thread_id). */
                so_write_index = LLVMBuildAdd(builder, so_write_index, tid, "");

                /* Load the descriptor and compute the write offset for each
                 * enabled buffer. */
                LLVMValueRef so_write_offset[4] = {};
                LLVMValueRef so_buffers[4];
                LLVMValueRef buf_ptr = LLVMGetParam(ctx->main_fn,
                                                    ctx->param_rw_buffers);

                for (i = 0; i < 4; i++) {
                        if (!so->stride[i])
                                continue;

                        LLVMValueRef offset = LLVMConstInt(ctx->i32,
                                                           SI_VS_STREAMOUT_BUF0 + i, 0);

                        so_buffers[i] = ac_build_load_to_sgpr(&ctx->ac, buf_ptr, offset);

                        LLVMValueRef so_offset = LLVMGetParam(ctx->main_fn,
                                                              ctx->param_streamout_offset[i]);
                        so_offset = LLVMBuildMul(builder, so_offset, LLVMConstInt(ctx->i32, 4, 0), "");

                        so_write_offset[i] = ac_build_imad(&ctx->ac, so_write_index,
                                                           LLVMConstInt(ctx->i32, so->stride[i]*4, 0),
                                                           so_offset);
                }

                /* Write streamout data. */
                for (i = 0; i < so->num_outputs; i++) {
                        unsigned reg = so->output[i].register_index;

                        if (reg >= noutput)
                                continue;

                        if (stream != so->output[i].stream)
                                continue;

                        emit_streamout_output(ctx, so_buffers, so_write_offset,
                                              &so->output[i], &outputs[reg]);
                }
        }
        lp_build_endif(&if_ctx);
}

static void si_export_param(struct si_shader_context *ctx, unsigned index,
                            LLVMValueRef *values)
{
        struct ac_export_args args;

        si_llvm_init_export_args(ctx, values,
                                 V_008DFC_SQ_EXP_PARAM + index, &args);
        ac_build_export(&ctx->ac, &args);
}

static void si_build_param_exports(struct si_shader_context *ctx,
                                   struct si_shader_output_values *outputs,
                                   unsigned noutput)
{
        struct si_shader *shader = ctx->shader;
        unsigned param_count = 0;

        for (unsigned i = 0; i < noutput; i++) {
                unsigned semantic_name = outputs[i].semantic_name;
                unsigned semantic_index = outputs[i].semantic_index;

                if (outputs[i].vertex_stream[0] != 0 &&
                    outputs[i].vertex_stream[1] != 0 &&
                    outputs[i].vertex_stream[2] != 0 &&
                    outputs[i].vertex_stream[3] != 0)
                        continue;

                switch (semantic_name) {
                case TGSI_SEMANTIC_LAYER:
                case TGSI_SEMANTIC_VIEWPORT_INDEX:
                case TGSI_SEMANTIC_CLIPDIST:
                case TGSI_SEMANTIC_COLOR:
                case TGSI_SEMANTIC_BCOLOR:
                case TGSI_SEMANTIC_PRIMID:
                case TGSI_SEMANTIC_FOG:
                case TGSI_SEMANTIC_TEXCOORD:
                case TGSI_SEMANTIC_GENERIC:
                        break;
                default:
                        continue;
                }

                if ((semantic_name != TGSI_SEMANTIC_GENERIC ||
                     semantic_index < SI_MAX_IO_GENERIC) &&
                    shader->key.opt.kill_outputs &
                    (1ull << si_shader_io_get_unique_index(semantic_name,
                                                           semantic_index, true)))
                        continue;

                si_export_param(ctx, param_count, outputs[i].values);

                assert(i < ARRAY_SIZE(shader->info.vs_output_param_offset));
                shader->info.vs_output_param_offset[i] = param_count++;
        }

        shader->info.nr_param_exports = param_count;
}

/* Generate export instructions for hardware VS shader stage */
static void si_llvm_export_vs(struct si_shader_context *ctx,
                              struct si_shader_output_values *outputs,
                              unsigned noutput)
{
        struct si_shader *shader = ctx->shader;
        struct ac_export_args pos_args[4] = {};
        LLVMValueRef psize_value = NULL, edgeflag_value = NULL, layer_value = NULL, viewport_index_value = NULL;
        unsigned pos_idx;
        int i;

        /* Build position exports. */
        for (i = 0; i < noutput; i++) {
                switch (outputs[i].semantic_name) {
                case TGSI_SEMANTIC_POSITION:
                        si_llvm_init_export_args(ctx, outputs[i].values,
                                                 V_008DFC_SQ_EXP_POS, &pos_args[0]);
                        break;
                case TGSI_SEMANTIC_PSIZE:
                        psize_value = outputs[i].values[0];
                        break;
                case TGSI_SEMANTIC_LAYER:
                        layer_value = outputs[i].values[0];
                        break;
                case TGSI_SEMANTIC_VIEWPORT_INDEX:
                        viewport_index_value = outputs[i].values[0];
                        break;
                case TGSI_SEMANTIC_EDGEFLAG:
                        edgeflag_value = outputs[i].values[0];
                        break;
                case TGSI_SEMANTIC_CLIPDIST:
                        if (!shader->key.opt.clip_disable) {
                                unsigned index = 2 + outputs[i].semantic_index;
                                si_llvm_init_export_args(ctx, outputs[i].values,
                                                         V_008DFC_SQ_EXP_POS + index,
                                                         &pos_args[index]);
                        }
                        break;
                case TGSI_SEMANTIC_CLIPVERTEX:
                        if (!shader->key.opt.clip_disable) {
                                si_llvm_emit_clipvertex(ctx, pos_args,
                                                        outputs[i].values);
                        }
                        break;
                }
        }

        /* We need to add the position output manually if it's missing. */
        if (!pos_args[0].out[0]) {
                pos_args[0].enabled_channels = 0xf; /* writemask */
                pos_args[0].valid_mask = 0; /* EXEC mask */
                pos_args[0].done = 0; /* last export? */
                pos_args[0].target = V_008DFC_SQ_EXP_POS;
                pos_args[0].compr = 0; /* COMPR flag */
                pos_args[0].out[0] = ctx->ac.f32_0; /* X */
                pos_args[0].out[1] = ctx->ac.f32_0; /* Y */
                pos_args[0].out[2] = ctx->ac.f32_0; /* Z */
                pos_args[0].out[3] = ctx->ac.f32_1;  /* W */
        }

        /* Write the misc vector (point size, edgeflag, layer, viewport). */
        if (shader->selector->info.writes_psize ||
            shader->selector->info.writes_edgeflag ||
            shader->selector->info.writes_viewport_index ||
            shader->selector->info.writes_layer) {
                pos_args[1].enabled_channels = shader->selector->info.writes_psize |
                                               (shader->selector->info.writes_edgeflag << 1) |
                                               (shader->selector->info.writes_layer << 2);

                pos_args[1].valid_mask = 0; /* EXEC mask */
                pos_args[1].done = 0; /* last export? */
                pos_args[1].target = V_008DFC_SQ_EXP_POS + 1;
                pos_args[1].compr = 0; /* COMPR flag */
                pos_args[1].out[0] = ctx->ac.f32_0; /* X */
                pos_args[1].out[1] = ctx->ac.f32_0; /* Y */
                pos_args[1].out[2] = ctx->ac.f32_0; /* Z */
                pos_args[1].out[3] = ctx->ac.f32_0; /* W */

                if (shader->selector->info.writes_psize)
                        pos_args[1].out[0] = psize_value;

                if (shader->selector->info.writes_edgeflag) {
                        /* The output is a float, but the hw expects an integer
                         * with the first bit containing the edge flag. */
                        edgeflag_value = LLVMBuildFPToUI(ctx->ac.builder,
                                                         edgeflag_value,
                                                         ctx->i32, "");
                        edgeflag_value = ac_build_umin(&ctx->ac,
                                                      edgeflag_value,
                                                      ctx->i32_1);

                        /* The LLVM intrinsic expects a float. */
                        pos_args[1].out[1] = ac_to_float(&ctx->ac, edgeflag_value);
                }

                if (ctx->screen->info.chip_class >= GFX9) {
                        /* GFX9 has the layer in out.z[10:0] and the viewport
                         * index in out.z[19:16].
                         */
                        if (shader->selector->info.writes_layer)
                                pos_args[1].out[2] = layer_value;

                        if (shader->selector->info.writes_viewport_index) {
                                LLVMValueRef v = viewport_index_value;

                                v = ac_to_integer(&ctx->ac, v);
                                v = LLVMBuildShl(ctx->ac.builder, v,
                                                 LLVMConstInt(ctx->i32, 16, 0), "");
                                v = LLVMBuildOr(ctx->ac.builder, v,
                                                ac_to_integer(&ctx->ac,  pos_args[1].out[2]), "");
                                pos_args[1].out[2] = ac_to_float(&ctx->ac, v);
                                pos_args[1].enabled_channels |= 1 << 2;
                        }
                } else {
                        if (shader->selector->info.writes_layer)
                                pos_args[1].out[2] = layer_value;

                        if (shader->selector->info.writes_viewport_index) {
                                pos_args[1].out[3] = viewport_index_value;
                                pos_args[1].enabled_channels |= 1 << 3;
                        }
                }
        }

        for (i = 0; i < 4; i++)
                if (pos_args[i].out[0])
                        shader->info.nr_pos_exports++;

        pos_idx = 0;
        for (i = 0; i < 4; i++) {
                if (!pos_args[i].out[0])
                        continue;

                /* Specify the target we are exporting */
                pos_args[i].target = V_008DFC_SQ_EXP_POS + pos_idx++;

                if (pos_idx == shader->info.nr_pos_exports)
                        /* Specify that this is the last export */
                        pos_args[i].done = 1;

                ac_build_export(&ctx->ac, &pos_args[i]);
        }

        /* Build parameter exports. */
        si_build_param_exports(ctx, outputs, noutput);
}

/**
 * Forward all outputs from the vertex shader to the TES. This is only used
 * for the fixed function TCS.
 */
static void si_copy_tcs_inputs(struct lp_build_tgsi_context *bld_base)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        LLVMValueRef invocation_id, buffer, buffer_offset;
        LLVMValueRef lds_vertex_stride, lds_base;
        uint64_t inputs;

        invocation_id = unpack_llvm_param(ctx, ctx->abi.tcs_rel_ids, 8, 5);
        buffer = get_tess_ring_descriptor(ctx, TESS_OFFCHIP_RING_TCS);
        buffer_offset = LLVMGetParam(ctx->main_fn, ctx->param_tcs_offchip_offset);

        lds_vertex_stride = get_tcs_in_vertex_dw_stride(ctx);
        lds_base = get_tcs_in_current_patch_offset(ctx);
        lds_base = ac_build_imad(&ctx->ac, invocation_id, lds_vertex_stride,
                                 lds_base);

        inputs = ctx->shader->key.mono.u.ff_tcs_inputs_to_copy;
        while (inputs) {
                unsigned i = u_bit_scan64(&inputs);

                LLVMValueRef lds_ptr = LLVMBuildAdd(ctx->ac.builder, lds_base,
                                            LLVMConstInt(ctx->i32, 4 * i, 0),
                                             "");

                LLVMValueRef buffer_addr = get_tcs_tes_buffer_address(ctx,
                                              get_rel_patch_id(ctx),
                                              invocation_id,
                                              LLVMConstInt(ctx->i32, i, 0));

                LLVMValueRef value = lds_load(bld_base, ctx->ac.i32, ~0,
                                              lds_ptr);

                ac_build_buffer_store_dword(&ctx->ac, buffer, value, 4, buffer_addr,
                                            buffer_offset, 0, 1, 0, true, false);
        }
}

static void si_write_tess_factors(struct lp_build_tgsi_context *bld_base,
                                  LLVMValueRef rel_patch_id,
                                  LLVMValueRef invocation_id,
                                  LLVMValueRef tcs_out_current_patch_data_offset,
                                  LLVMValueRef invoc0_tf_outer[4],
                                  LLVMValueRef invoc0_tf_inner[2])
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        struct si_shader *shader = ctx->shader;
        unsigned tess_inner_index, tess_outer_index;
        LLVMValueRef lds_base, lds_inner, lds_outer, byteoffset, buffer;
        LLVMValueRef out[6], vec0, vec1, tf_base, inner[4], outer[4];
        unsigned stride, outer_comps, inner_comps, i, offset;
        struct lp_build_if_state if_ctx, inner_if_ctx;

        /* Add a barrier before loading tess factors from LDS. */
        if (!shader->key.part.tcs.epilog.invoc0_tess_factors_are_def)
                si_llvm_emit_barrier(NULL, bld_base, NULL);

        /* Do this only for invocation 0, because the tess levels are per-patch,
         * not per-vertex.
         *
         * This can't jump, because invocation 0 executes this. It should
         * at least mask out the loads and stores for other invocations.
         */
        lp_build_if(&if_ctx, &ctx->gallivm,
                    LLVMBuildICmp(ctx->ac.builder, LLVMIntEQ,
                                  invocation_id, ctx->i32_0, ""));

        /* Determine the layout of one tess factor element in the buffer. */
        switch (shader->key.part.tcs.epilog.prim_mode) {
        case PIPE_PRIM_LINES:
                stride = 2; /* 2 dwords, 1 vec2 store */
                outer_comps = 2;
                inner_comps = 0;
                break;
        case PIPE_PRIM_TRIANGLES:
                stride = 4; /* 4 dwords, 1 vec4 store */
                outer_comps = 3;
                inner_comps = 1;
                break;
        case PIPE_PRIM_QUADS:
                stride = 6; /* 6 dwords, 2 stores (vec4 + vec2) */
                outer_comps = 4;
                inner_comps = 2;
                break;
        default:
                assert(0);
                return;
        }

        for (i = 0; i < 4; i++) {
                inner[i] = LLVMGetUndef(ctx->i32);
                outer[i] = LLVMGetUndef(ctx->i32);
        }

        if (shader->key.part.tcs.epilog.invoc0_tess_factors_are_def) {
                /* Tess factors are in VGPRs. */
                for (i = 0; i < outer_comps; i++)
                        outer[i] = out[i] = invoc0_tf_outer[i];
                for (i = 0; i < inner_comps; i++)
                        inner[i] = out[outer_comps+i] = invoc0_tf_inner[i];
        } else {
                /* Load tess_inner and tess_outer from LDS.
                 * Any invocation can write them, so we can't get them from a temporary.
                 */
                tess_inner_index = si_shader_io_get_unique_index_patch(TGSI_SEMANTIC_TESSINNER, 0);
                tess_outer_index = si_shader_io_get_unique_index_patch(TGSI_SEMANTIC_TESSOUTER, 0);

                lds_base = tcs_out_current_patch_data_offset;
                lds_inner = LLVMBuildAdd(ctx->ac.builder, lds_base,
                                         LLVMConstInt(ctx->i32,
                                                      tess_inner_index * 4, 0), "");
                lds_outer = LLVMBuildAdd(ctx->ac.builder, lds_base,
                                         LLVMConstInt(ctx->i32,
                                                      tess_outer_index * 4, 0), "");

                for (i = 0; i < outer_comps; i++) {
                        outer[i] = out[i] =
                                lds_load(bld_base, ctx->ac.i32, i, lds_outer);
                }
                for (i = 0; i < inner_comps; i++) {
                        inner[i] = out[outer_comps+i] =
                                lds_load(bld_base, ctx->ac.i32, i, lds_inner);
                }
        }

        if (shader->key.part.tcs.epilog.prim_mode == PIPE_PRIM_LINES) {
                /* For isolines, the hardware expects tess factors in the
                 * reverse order from what GLSL / TGSI specify.
                 */
                LLVMValueRef tmp = out[0];
                out[0] = out[1];
                out[1] = tmp;
        }

        /* Convert the outputs to vectors for stores. */
        vec0 = ac_build_gather_values(&ctx->ac, out, MIN2(stride, 4));
        vec1 = NULL;

        if (stride > 4)
                vec1 = ac_build_gather_values(&ctx->ac, out+4, stride - 4);

        /* Get the buffer. */
        buffer = get_tess_ring_descriptor(ctx, TCS_FACTOR_RING);

        /* Get the offset. */
        tf_base = LLVMGetParam(ctx->main_fn,
                               ctx->param_tcs_factor_offset);
        byteoffset = LLVMBuildMul(ctx->ac.builder, rel_patch_id,
                                  LLVMConstInt(ctx->i32, 4 * stride, 0), "");

        lp_build_if(&inner_if_ctx, &ctx->gallivm,
                    LLVMBuildICmp(ctx->ac.builder, LLVMIntEQ,
                                  rel_patch_id, ctx->i32_0, ""));

        /* Store the dynamic HS control word. */
        offset = 0;
        if (ctx->screen->info.chip_class <= GFX8) {
                ac_build_buffer_store_dword(&ctx->ac, buffer,
                                            LLVMConstInt(ctx->i32, 0x80000000, 0),
                                            1, ctx->i32_0, tf_base,
                                            offset, 1, 0, true, false);
                offset += 4;
        }

        lp_build_endif(&inner_if_ctx);

        /* Store the tessellation factors. */
        ac_build_buffer_store_dword(&ctx->ac, buffer, vec0,
                                    MIN2(stride, 4), byteoffset, tf_base,
                                    offset, 1, 0, true, false);
        offset += 16;
        if (vec1)
                ac_build_buffer_store_dword(&ctx->ac, buffer, vec1,
                                            stride - 4, byteoffset, tf_base,
                                            offset, 1, 0, true, false);

        /* Store the tess factors into the offchip buffer if TES reads them. */
        if (shader->key.part.tcs.epilog.tes_reads_tess_factors) {
                LLVMValueRef buf, base, inner_vec, outer_vec, tf_outer_offset;
                LLVMValueRef tf_inner_offset;
                unsigned param_outer, param_inner;

                buf = get_tess_ring_descriptor(ctx, TESS_OFFCHIP_RING_TCS);
                base = LLVMGetParam(ctx->main_fn, ctx->param_tcs_offchip_offset);

                param_outer = si_shader_io_get_unique_index_patch(
                                      TGSI_SEMANTIC_TESSOUTER, 0);
                tf_outer_offset = get_tcs_tes_buffer_address(ctx, rel_patch_id, NULL,
                                        LLVMConstInt(ctx->i32, param_outer, 0));

                outer_vec = ac_build_gather_values(&ctx->ac, outer,
                                                   util_next_power_of_two(outer_comps));

                ac_build_buffer_store_dword(&ctx->ac, buf, outer_vec,
                                            outer_comps, tf_outer_offset,
                                            base, 0, 1, 0, true, false);
                if (inner_comps) {
                        param_inner = si_shader_io_get_unique_index_patch(
                                              TGSI_SEMANTIC_TESSINNER, 0);
                        tf_inner_offset = get_tcs_tes_buffer_address(ctx, rel_patch_id, NULL,
                                        LLVMConstInt(ctx->i32, param_inner, 0));

                        inner_vec = inner_comps == 1 ? inner[0] :
                                    ac_build_gather_values(&ctx->ac, inner, inner_comps);
                        ac_build_buffer_store_dword(&ctx->ac, buf, inner_vec,
                                                    inner_comps, tf_inner_offset,
                                                    base, 0, 1, 0, true, false);
                }
        }

        lp_build_endif(&if_ctx);
}

static LLVMValueRef
si_insert_input_ret(struct si_shader_context *ctx, LLVMValueRef ret,
                    unsigned param, unsigned return_index)
{
        return LLVMBuildInsertValue(ctx->ac.builder, ret,
                                    LLVMGetParam(ctx->main_fn, param),
                                    return_index, "");
}

static LLVMValueRef
si_insert_input_ret_float(struct si_shader_context *ctx, LLVMValueRef ret,
                          unsigned param, unsigned return_index)
{
        LLVMBuilderRef builder = ctx->ac.builder;
        LLVMValueRef p = LLVMGetParam(ctx->main_fn, param);

        return LLVMBuildInsertValue(builder, ret,
                                    ac_to_float(&ctx->ac, p),
                                    return_index, "");
}

static LLVMValueRef
si_insert_input_ptr(struct si_shader_context *ctx, LLVMValueRef ret,
                    unsigned param, unsigned return_index)
{
        LLVMBuilderRef builder = ctx->ac.builder;
        LLVMValueRef ptr = LLVMGetParam(ctx->main_fn, param);
        ptr = LLVMBuildPtrToInt(builder, ptr, ctx->i32, "");
        return LLVMBuildInsertValue(builder, ret, ptr, return_index, "");
}

/* This only writes the tessellation factor levels. */
static void si_llvm_emit_tcs_epilogue(struct ac_shader_abi *abi,
                                      unsigned max_outputs,
                                      LLVMValueRef *addrs)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        struct lp_build_tgsi_context *bld_base = &ctx->bld_base;
        LLVMBuilderRef builder = ctx->ac.builder;
        LLVMValueRef rel_patch_id, invocation_id, tf_lds_offset;

        si_copy_tcs_inputs(bld_base);

        rel_patch_id = get_rel_patch_id(ctx);
        invocation_id = unpack_llvm_param(ctx, ctx->abi.tcs_rel_ids, 8, 5);
        tf_lds_offset = get_tcs_out_current_patch_data_offset(ctx);

        if (ctx->screen->info.chip_class >= GFX9) {
                LLVMBasicBlockRef blocks[2] = {
                        LLVMGetInsertBlock(builder),
                        ctx->merged_wrap_if_state.entry_block
                };
                LLVMValueRef values[2];

                lp_build_endif(&ctx->merged_wrap_if_state);

                values[0] = rel_patch_id;
                values[1] = LLVMGetUndef(ctx->i32);
                rel_patch_id = ac_build_phi(&ctx->ac, ctx->i32, 2, values, blocks);

                values[0] = tf_lds_offset;
                values[1] = LLVMGetUndef(ctx->i32);
                tf_lds_offset = ac_build_phi(&ctx->ac, ctx->i32, 2, values, blocks);

                values[0] = invocation_id;
                values[1] = ctx->i32_1; /* cause the epilog to skip threads */
                invocation_id = ac_build_phi(&ctx->ac, ctx->i32, 2, values, blocks);
        }

        /* Return epilog parameters from this function. */
        LLVMValueRef ret = ctx->return_value;
        unsigned vgpr;

        if (ctx->screen->info.chip_class >= GFX9) {
                ret = si_insert_input_ret(ctx, ret, ctx->param_tcs_offchip_layout,
                                          8 + GFX9_SGPR_TCS_OFFCHIP_LAYOUT);
                ret = si_insert_input_ret(ctx, ret, ctx->param_tcs_out_lds_layout,
                                          8 + GFX9_SGPR_TCS_OUT_LAYOUT);
                /* Tess offchip and tess factor offsets are at the beginning. */
                ret = si_insert_input_ret(ctx, ret, ctx->param_tcs_offchip_offset, 2);
                ret = si_insert_input_ret(ctx, ret, ctx->param_tcs_factor_offset, 4);
                vgpr = 8 + GFX9_SGPR_TCS_OUT_LAYOUT + 1;
        } else {
                ret = si_insert_input_ret(ctx, ret, ctx->param_tcs_offchip_layout,
                                          GFX6_SGPR_TCS_OFFCHIP_LAYOUT);
                ret = si_insert_input_ret(ctx, ret, ctx->param_tcs_out_lds_layout,
                                          GFX6_SGPR_TCS_OUT_LAYOUT);
                /* Tess offchip and tess factor offsets are after user SGPRs. */
                ret = si_insert_input_ret(ctx, ret, ctx->param_tcs_offchip_offset,
                                          GFX6_TCS_NUM_USER_SGPR);
                ret = si_insert_input_ret(ctx, ret, ctx->param_tcs_factor_offset,
                                          GFX6_TCS_NUM_USER_SGPR + 1);
                vgpr = GFX6_TCS_NUM_USER_SGPR + 2;
        }

        /* VGPRs */
        rel_patch_id = ac_to_float(&ctx->ac, rel_patch_id);
        invocation_id = ac_to_float(&ctx->ac, invocation_id);
        tf_lds_offset = ac_to_float(&ctx->ac, tf_lds_offset);

        /* Leave a hole corresponding to the two input VGPRs. This ensures that
         * the invocation_id output does not alias the tcs_rel_ids input,
         * which saves a V_MOV on gfx9.
         */
        vgpr += 2;

        ret = LLVMBuildInsertValue(builder, ret, rel_patch_id, vgpr++, "");
        ret = LLVMBuildInsertValue(builder, ret, invocation_id, vgpr++, "");

        if (ctx->shader->selector->tcs_info.tessfactors_are_def_in_all_invocs) {
                vgpr++; /* skip the tess factor LDS offset */
                for (unsigned i = 0; i < 6; i++) {
                        LLVMValueRef value =
                                LLVMBuildLoad(builder, ctx->invoc0_tess_factors[i], "");
                        value = ac_to_float(&ctx->ac, value);
                        ret = LLVMBuildInsertValue(builder, ret, value, vgpr++, "");
                }
        } else {
                ret = LLVMBuildInsertValue(builder, ret, tf_lds_offset, vgpr++, "");
        }
        ctx->return_value = ret;
}

/* Pass TCS inputs from LS to TCS on GFX9. */
static void si_set_ls_return_value_for_tcs(struct si_shader_context *ctx)
{
        LLVMValueRef ret = ctx->return_value;

        ret = si_insert_input_ptr(ctx, ret, 0, 0);
        ret = si_insert_input_ptr(ctx, ret, 1, 1);
        ret = si_insert_input_ret(ctx, ret, ctx->param_tcs_offchip_offset, 2);
        ret = si_insert_input_ret(ctx, ret, ctx->param_merged_wave_info, 3);
        ret = si_insert_input_ret(ctx, ret, ctx->param_tcs_factor_offset, 4);
        ret = si_insert_input_ret(ctx, ret, ctx->param_merged_scratch_offset, 5);

        ret = si_insert_input_ptr(ctx, ret, ctx->param_rw_buffers,
                                  8 + SI_SGPR_RW_BUFFERS);
        ret = si_insert_input_ptr(ctx, ret,
                                  ctx->param_bindless_samplers_and_images,
                                  8 + SI_SGPR_BINDLESS_SAMPLERS_AND_IMAGES);

        ret = si_insert_input_ret(ctx, ret, ctx->param_vs_state_bits,
                                  8 + SI_SGPR_VS_STATE_BITS);

        ret = si_insert_input_ret(ctx, ret, ctx->param_tcs_offchip_layout,
                                  8 + GFX9_SGPR_TCS_OFFCHIP_LAYOUT);
        ret = si_insert_input_ret(ctx, ret, ctx->param_tcs_out_lds_offsets,
                                  8 + GFX9_SGPR_TCS_OUT_OFFSETS);
        ret = si_insert_input_ret(ctx, ret, ctx->param_tcs_out_lds_layout,
                                  8 + GFX9_SGPR_TCS_OUT_LAYOUT);

        unsigned vgpr = 8 + GFX9_TCS_NUM_USER_SGPR;
        ret = LLVMBuildInsertValue(ctx->ac.builder, ret,
                                   ac_to_float(&ctx->ac, ctx->abi.tcs_patch_id),
                                   vgpr++, "");
        ret = LLVMBuildInsertValue(ctx->ac.builder, ret,
                                   ac_to_float(&ctx->ac, ctx->abi.tcs_rel_ids),
                                   vgpr++, "");
        ctx->return_value = ret;
}

/* Pass GS inputs from ES to GS on GFX9. */
static void si_set_es_return_value_for_gs(struct si_shader_context *ctx)
{
        LLVMValueRef ret = ctx->return_value;

        ret = si_insert_input_ptr(ctx, ret, 0, 0);
        ret = si_insert_input_ptr(ctx, ret, 1, 1);
        ret = si_insert_input_ret(ctx, ret, ctx->param_gs2vs_offset, 2);
        ret = si_insert_input_ret(ctx, ret, ctx->param_merged_wave_info, 3);
        ret = si_insert_input_ret(ctx, ret, ctx->param_merged_scratch_offset, 5);

        ret = si_insert_input_ptr(ctx, ret, ctx->param_rw_buffers,
                                  8 + SI_SGPR_RW_BUFFERS);
        ret = si_insert_input_ptr(ctx, ret,
                                  ctx->param_bindless_samplers_and_images,
                                  8 + SI_SGPR_BINDLESS_SAMPLERS_AND_IMAGES);

        unsigned vgpr;
        if (ctx->type == PIPE_SHADER_VERTEX)
                vgpr = 8 + GFX9_VSGS_NUM_USER_SGPR;
        else
                vgpr = 8 + GFX9_TESGS_NUM_USER_SGPR;

        for (unsigned i = 0; i < 5; i++) {
                unsigned param = ctx->param_gs_vtx01_offset + i;
                ret = si_insert_input_ret_float(ctx, ret, param, vgpr++);
        }
        ctx->return_value = ret;
}

static void si_llvm_emit_ls_epilogue(struct ac_shader_abi *abi,
                                     unsigned max_outputs,
                                     LLVMValueRef *addrs)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        struct si_shader *shader = ctx->shader;
        struct tgsi_shader_info *info = &shader->selector->info;
        unsigned i, chan;
        LLVMValueRef vertex_id = LLVMGetParam(ctx->main_fn,
                                              ctx->param_rel_auto_id);
        LLVMValueRef vertex_dw_stride = get_tcs_in_vertex_dw_stride(ctx);
        LLVMValueRef base_dw_addr = LLVMBuildMul(ctx->ac.builder, vertex_id,
                                                 vertex_dw_stride, "");

        /* Write outputs to LDS. The next shader (TCS aka HS) will read
         * its inputs from it. */
        for (i = 0; i < info->num_outputs; i++) {
                unsigned name = info->output_semantic_name[i];
                unsigned index = info->output_semantic_index[i];

                /* The ARB_shader_viewport_layer_array spec contains the
                 * following issue:
                 *
                 *    2) What happens if gl_ViewportIndex or gl_Layer is
                 *    written in the vertex shader and a geometry shader is
                 *    present?
                 *
                 *    RESOLVED: The value written by the last vertex processing
                 *    stage is used. If the last vertex processing stage
                 *    (vertex, tessellation evaluation or geometry) does not
                 *    statically assign to gl_ViewportIndex or gl_Layer, index
                 *    or layer zero is assumed.
                 *
                 * So writes to those outputs in VS-as-LS are simply ignored.
                 */
                if (name == TGSI_SEMANTIC_LAYER ||
                    name == TGSI_SEMANTIC_VIEWPORT_INDEX)
                        continue;

                int param = si_shader_io_get_unique_index(name, index, false);
                LLVMValueRef dw_addr = LLVMBuildAdd(ctx->ac.builder, base_dw_addr,
                                        LLVMConstInt(ctx->i32, param * 4, 0), "");

                for (chan = 0; chan < 4; chan++) {
                        if (!(info->output_usagemask[i] & (1 << chan)))
                                continue;

                        lds_store(ctx, chan, dw_addr,
                                  LLVMBuildLoad(ctx->ac.builder, addrs[4 * i + chan], ""));
                }
        }

        if (ctx->screen->info.chip_class >= GFX9)
                si_set_ls_return_value_for_tcs(ctx);
}

static void si_llvm_emit_es_epilogue(struct ac_shader_abi *abi,
                                     unsigned max_outputs,
                                     LLVMValueRef *addrs)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        struct si_shader *es = ctx->shader;
        struct tgsi_shader_info *info = &es->selector->info;
        LLVMValueRef soffset = LLVMGetParam(ctx->main_fn,
                                            ctx->param_es2gs_offset);
        LLVMValueRef lds_base = NULL;
        unsigned chan;
        int i;

        if (ctx->screen->info.chip_class >= GFX9 && info->num_outputs) {
                unsigned itemsize_dw = es->selector->esgs_itemsize / 4;
                LLVMValueRef vertex_idx = ac_get_thread_id(&ctx->ac);
                LLVMValueRef wave_idx = si_unpack_param(ctx, ctx->param_merged_wave_info, 24, 4);
                vertex_idx = LLVMBuildOr(ctx->ac.builder, vertex_idx,
                                         LLVMBuildMul(ctx->ac.builder, wave_idx,
                                                      LLVMConstInt(ctx->i32, 64, false), ""), "");
                lds_base = LLVMBuildMul(ctx->ac.builder, vertex_idx,
                                        LLVMConstInt(ctx->i32, itemsize_dw, 0), "");
        }

        for (i = 0; i < info->num_outputs; i++) {
                int param;

                if (info->output_semantic_name[i] == TGSI_SEMANTIC_VIEWPORT_INDEX ||
                    info->output_semantic_name[i] == TGSI_SEMANTIC_LAYER)
                        continue;

                param = si_shader_io_get_unique_index(info->output_semantic_name[i],
                                                      info->output_semantic_index[i], false);

                for (chan = 0; chan < 4; chan++) {
                        if (!(info->output_usagemask[i] & (1 << chan)))
                                continue;

                        LLVMValueRef out_val = LLVMBuildLoad(ctx->ac.builder, addrs[4 * i + chan], "");
                        out_val = ac_to_integer(&ctx->ac, out_val);

                        /* GFX9 has the ESGS ring in LDS. */
                        if (ctx->screen->info.chip_class >= GFX9) {
                                lds_store(ctx, param * 4 + chan, lds_base, out_val);
                                continue;
                        }

                        ac_build_buffer_store_dword(&ctx->ac,
                                                    ctx->esgs_ring,
                                                    out_val, 1, NULL, soffset,
                                                    (4 * param + chan) * 4,
                                                    1, 1, true, true);
                }
        }

        if (ctx->screen->info.chip_class >= GFX9)
                si_set_es_return_value_for_gs(ctx);
}

static LLVMValueRef si_get_gs_wave_id(struct si_shader_context *ctx)
{
        if (ctx->screen->info.chip_class >= GFX9)
                return si_unpack_param(ctx, ctx->param_merged_wave_info, 16, 8);
        else
                return LLVMGetParam(ctx->main_fn, ctx->param_gs_wave_id);
}

static void emit_gs_epilogue(struct si_shader_context *ctx)
{
        ac_build_sendmsg(&ctx->ac, AC_SENDMSG_GS_OP_NOP | AC_SENDMSG_GS_DONE,
                         si_get_gs_wave_id(ctx));

        if (ctx->screen->info.chip_class >= GFX9)
                lp_build_endif(&ctx->merged_wrap_if_state);
}

static void si_llvm_emit_gs_epilogue(struct ac_shader_abi *abi,
                                     unsigned max_outputs,
                                     LLVMValueRef *addrs)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        struct tgsi_shader_info UNUSED *info = &ctx->shader->selector->info;

        assert(info->num_outputs <= max_outputs);

        emit_gs_epilogue(ctx);
}

static void si_tgsi_emit_gs_epilogue(struct lp_build_tgsi_context *bld_base)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        emit_gs_epilogue(ctx);
}

static void si_llvm_emit_vs_epilogue(struct ac_shader_abi *abi,
                                     unsigned max_outputs,
                                     LLVMValueRef *addrs)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        struct tgsi_shader_info *info = &ctx->shader->selector->info;
        struct si_shader_output_values *outputs = NULL;
        int i,j;

        assert(!ctx->shader->is_gs_copy_shader);
        assert(info->num_outputs <= max_outputs);

        outputs = MALLOC((info->num_outputs + 1) * sizeof(outputs[0]));

        /* Vertex color clamping.
         *
         * This uses a state constant loaded in a user data SGPR and
         * an IF statement is added that clamps all colors if the constant
         * is true.
         */
        struct lp_build_if_state if_ctx;
        LLVMValueRef cond = NULL;
        LLVMValueRef addr, val;

        for (i = 0; i < info->num_outputs; i++) {
                if (info->output_semantic_name[i] != TGSI_SEMANTIC_COLOR &&
                    info->output_semantic_name[i] != TGSI_SEMANTIC_BCOLOR)
                        continue;

                /* We've found a color. */
                if (!cond) {
                        /* The state is in the first bit of the user SGPR. */
                        cond = LLVMGetParam(ctx->main_fn,
                                            ctx->param_vs_state_bits);
                        cond = LLVMBuildTrunc(ctx->ac.builder, cond,
                                              ctx->i1, "");
                        lp_build_if(&if_ctx, &ctx->gallivm, cond);
                }

                for (j = 0; j < 4; j++) {
                        addr = addrs[4 * i + j];
                        val = LLVMBuildLoad(ctx->ac.builder, addr, "");
                        val = ac_build_clamp(&ctx->ac, val);
                        LLVMBuildStore(ctx->ac.builder, val, addr);
                }
        }

        if (cond)
                lp_build_endif(&if_ctx);

        for (i = 0; i < info->num_outputs; i++) {
                outputs[i].semantic_name = info->output_semantic_name[i];
                outputs[i].semantic_index = info->output_semantic_index[i];

                for (j = 0; j < 4; j++) {
                        outputs[i].values[j] =
                                LLVMBuildLoad(ctx->ac.builder,
                                              addrs[4 * i + j],
                                              "");
                        outputs[i].vertex_stream[j] =
                                (info->output_streams[i] >> (2 * j)) & 3;
                }
        }

        if (ctx->shader->selector->so.num_outputs)
                si_llvm_emit_streamout(ctx, outputs, i, 0);

        /* Export PrimitiveID. */
        if (ctx->shader->key.mono.u.vs_export_prim_id) {
                outputs[i].semantic_name = TGSI_SEMANTIC_PRIMID;
                outputs[i].semantic_index = 0;
                outputs[i].values[0] = ac_to_float(&ctx->ac, get_primitive_id(ctx, 0));
                for (j = 1; j < 4; j++)
                        outputs[i].values[j] = LLVMConstReal(ctx->f32, 0);

                memset(outputs[i].vertex_stream, 0,
                       sizeof(outputs[i].vertex_stream));
                i++;
        }

        si_llvm_export_vs(ctx, outputs, i);
        FREE(outputs);
}

static void si_tgsi_emit_epilogue(struct lp_build_tgsi_context *bld_base)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);

        ctx->abi.emit_outputs(&ctx->abi, RADEON_LLVM_MAX_OUTPUTS,
                              &ctx->outputs[0][0]);
}

struct si_ps_exports {
        unsigned num;
        struct ac_export_args args[10];
};

static void si_export_mrt_z(struct lp_build_tgsi_context *bld_base,
                            LLVMValueRef depth, LLVMValueRef stencil,
                            LLVMValueRef samplemask, struct si_ps_exports *exp)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        struct ac_export_args args;

        ac_export_mrt_z(&ctx->ac, depth, stencil, samplemask, &args);

        memcpy(&exp->args[exp->num++], &args, sizeof(args));
}

static void si_export_mrt_color(struct lp_build_tgsi_context *bld_base,
                                LLVMValueRef *color, unsigned index,
                                unsigned samplemask_param,
                                bool is_last, struct si_ps_exports *exp)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        int i;

        /* Clamp color */
        if (ctx->shader->key.part.ps.epilog.clamp_color)
                for (i = 0; i < 4; i++)
                        color[i] = ac_build_clamp(&ctx->ac, color[i]);

        /* Alpha to one */
        if (ctx->shader->key.part.ps.epilog.alpha_to_one)
                color[3] = ctx->ac.f32_1;

        /* Alpha test */
        if (index == 0 &&
            ctx->shader->key.part.ps.epilog.alpha_func != PIPE_FUNC_ALWAYS)
                si_alpha_test(bld_base, color[3]);

        /* Line & polygon smoothing */
        if (ctx->shader->key.part.ps.epilog.poly_line_smoothing)
                color[3] = si_scale_alpha_by_sample_mask(bld_base, color[3],
                                                         samplemask_param);

        /* If last_cbuf > 0, FS_COLOR0_WRITES_ALL_CBUFS is true. */
        if (ctx->shader->key.part.ps.epilog.last_cbuf > 0) {
                struct ac_export_args args[8];
                int c, last = -1;

                /* Get the export arguments, also find out what the last one is. */
                for (c = 0; c <= ctx->shader->key.part.ps.epilog.last_cbuf; c++) {
                        si_llvm_init_export_args(ctx, color,
                                                 V_008DFC_SQ_EXP_MRT + c, &args[c]);
                        if (args[c].enabled_channels)
                                last = c;
                }

                /* Emit all exports. */
                for (c = 0; c <= ctx->shader->key.part.ps.epilog.last_cbuf; c++) {
                        if (is_last && last == c) {
                                args[c].valid_mask = 1; /* whether the EXEC mask is valid */
                                args[c].done = 1; /* DONE bit */
                        } else if (!args[c].enabled_channels)
                                continue; /* unnecessary NULL export */

                        memcpy(&exp->args[exp->num++], &args[c], sizeof(args[c]));
                }
        } else {
                struct ac_export_args args;

                /* Export */
                si_llvm_init_export_args(ctx, color, V_008DFC_SQ_EXP_MRT + index,
                                         &args);
                if (is_last) {
                        args.valid_mask = 1; /* whether the EXEC mask is valid */
                        args.done = 1; /* DONE bit */
                } else if (!args.enabled_channels)
                        return; /* unnecessary NULL export */

                memcpy(&exp->args[exp->num++], &args, sizeof(args));
        }
}

static void si_emit_ps_exports(struct si_shader_context *ctx,
                               struct si_ps_exports *exp)
{
        for (unsigned i = 0; i < exp->num; i++)
                ac_build_export(&ctx->ac, &exp->args[i]);
}

/**
 * Return PS outputs in this order:
 *
 * v[0:3] = color0.xyzw
 * v[4:7] = color1.xyzw
 * ...
 * vN+0 = Depth
 * vN+1 = Stencil
 * vN+2 = SampleMask
 * vN+3 = SampleMaskIn (used for OpenGL smoothing)
 *
 * The alpha-ref SGPR is returned via its original location.
 */
static void si_llvm_return_fs_outputs(struct ac_shader_abi *abi,
                                      unsigned max_outputs,
                                      LLVMValueRef *addrs)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        struct si_shader *shader = ctx->shader;
        struct tgsi_shader_info *info = &shader->selector->info;
        LLVMBuilderRef builder = ctx->ac.builder;
        unsigned i, j, first_vgpr, vgpr;

        LLVMValueRef color[8][4] = {};
        LLVMValueRef depth = NULL, stencil = NULL, samplemask = NULL;
        LLVMValueRef ret;

        if (ctx->postponed_kill)
                ac_build_kill_if_false(&ctx->ac, LLVMBuildLoad(builder, ctx->postponed_kill, ""));

        /* Read the output values. */
        for (i = 0; i < info->num_outputs; i++) {
                unsigned semantic_name = info->output_semantic_name[i];
                unsigned semantic_index = info->output_semantic_index[i];

                switch (semantic_name) {
                case TGSI_SEMANTIC_COLOR:
                        assert(semantic_index < 8);
                        for (j = 0; j < 4; j++) {
                                LLVMValueRef ptr = addrs[4 * i + j];
                                LLVMValueRef result = LLVMBuildLoad(builder, ptr, "");
                                color[semantic_index][j] = result;
                        }
                        break;
                case TGSI_SEMANTIC_POSITION:
                        depth = LLVMBuildLoad(builder,
                                              addrs[4 * i + 2], "");
                        break;
                case TGSI_SEMANTIC_STENCIL:
                        stencil = LLVMBuildLoad(builder,
                                                addrs[4 * i + 1], "");
                        break;
                case TGSI_SEMANTIC_SAMPLEMASK:
                        samplemask = LLVMBuildLoad(builder,
                                                   addrs[4 * i + 0], "");
                        break;
                default:
                        fprintf(stderr, "Warning: GFX6 unhandled fs output type:%d\n",
                                semantic_name);
                }
        }

        /* Fill the return structure. */
        ret = ctx->return_value;

        /* Set SGPRs. */
        ret = LLVMBuildInsertValue(builder, ret,
                                   ac_to_integer(&ctx->ac,
                                                 LLVMGetParam(ctx->main_fn,
                                                              SI_PARAM_ALPHA_REF)),
                                   SI_SGPR_ALPHA_REF, "");

        /* Set VGPRs */
        first_vgpr = vgpr = SI_SGPR_ALPHA_REF + 1;
        for (i = 0; i < ARRAY_SIZE(color); i++) {
                if (!color[i][0])
                        continue;

                for (j = 0; j < 4; j++)
                        ret = LLVMBuildInsertValue(builder, ret, color[i][j], vgpr++, "");
        }
        if (depth)
                ret = LLVMBuildInsertValue(builder, ret, depth, vgpr++, "");
        if (stencil)
                ret = LLVMBuildInsertValue(builder, ret, stencil, vgpr++, "");
        if (samplemask)
                ret = LLVMBuildInsertValue(builder, ret, samplemask, vgpr++, "");

        /* Add the input sample mask for smoothing at the end. */
        if (vgpr < first_vgpr + PS_EPILOG_SAMPLEMASK_MIN_LOC)
                vgpr = first_vgpr + PS_EPILOG_SAMPLEMASK_MIN_LOC;
        ret = LLVMBuildInsertValue(builder, ret,
                                   LLVMGetParam(ctx->main_fn,
                                                SI_PARAM_SAMPLE_COVERAGE), vgpr++, "");

        ctx->return_value = ret;
}

static void membar_emit(
                const struct lp_build_tgsi_action *action,
                struct lp_build_tgsi_context *bld_base,
                struct lp_build_emit_data *emit_data)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        LLVMValueRef src0 = lp_build_emit_fetch(bld_base, emit_data->inst, 0, 0);
        unsigned flags = LLVMConstIntGetZExtValue(src0);
        unsigned waitcnt = NOOP_WAITCNT;

        if (flags & TGSI_MEMBAR_THREAD_GROUP)
                waitcnt &= VM_CNT & LGKM_CNT;

        if (flags & (TGSI_MEMBAR_ATOMIC_BUFFER |
                     TGSI_MEMBAR_SHADER_BUFFER |
                     TGSI_MEMBAR_SHADER_IMAGE))
                waitcnt &= VM_CNT;

        if (flags & TGSI_MEMBAR_SHARED)
                waitcnt &= LGKM_CNT;

        if (waitcnt != NOOP_WAITCNT)
                ac_build_waitcnt(&ctx->ac, waitcnt);
}

static void clock_emit(
                const struct lp_build_tgsi_action *action,
                struct lp_build_tgsi_context *bld_base,
                struct lp_build_emit_data *emit_data)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        LLVMValueRef tmp = ac_build_shader_clock(&ctx->ac);

        emit_data->output[0] =
                LLVMBuildExtractElement(ctx->ac.builder, tmp, ctx->i32_0, "");
        emit_data->output[1] =
                LLVMBuildExtractElement(ctx->ac.builder, tmp, ctx->i32_1, "");
}

static void si_llvm_emit_ddxy(
        const struct lp_build_tgsi_action *action,
        struct lp_build_tgsi_context *bld_base,
        struct lp_build_emit_data *emit_data)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        unsigned opcode = emit_data->info->opcode;
        LLVMValueRef val;
        int idx;
        unsigned mask;

        if (opcode == TGSI_OPCODE_DDX_FINE)
                mask = AC_TID_MASK_LEFT;
        else if (opcode == TGSI_OPCODE_DDY_FINE)
                mask = AC_TID_MASK_TOP;
        else
                mask = AC_TID_MASK_TOP_LEFT;

        /* for DDX we want to next X pixel, DDY next Y pixel. */
        idx = (opcode == TGSI_OPCODE_DDX || opcode == TGSI_OPCODE_DDX_FINE) ? 1 : 2;

        val = ac_to_integer(&ctx->ac, emit_data->args[0]);
        val = ac_build_ddxy(&ctx->ac, mask, idx, val);
        emit_data->output[emit_data->chan] = val;
}

static void build_interp_intrinsic(const struct lp_build_tgsi_action *action,
                                struct lp_build_tgsi_context *bld_base,
                                struct lp_build_emit_data *emit_data)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        struct si_shader *shader = ctx->shader;
        const struct tgsi_shader_info *info = &shader->selector->info;
        LLVMValueRef interp_param;
        const struct tgsi_full_instruction *inst = emit_data->inst;
        const struct tgsi_full_src_register *input = &inst->Src[0];
        int input_base, input_array_size;
        int chan;
        int i;
        LLVMValueRef prim_mask = ctx->abi.prim_mask;
        LLVMValueRef array_idx, offset_x = NULL, offset_y = NULL;
        int interp_param_idx;
        unsigned interp;
        unsigned location;

        if (inst->Instruction.Opcode == TGSI_OPCODE_INTERP_OFFSET) {
                /* offset is in second src, first two channels */
                offset_x = lp_build_emit_fetch(bld_base, emit_data->inst, 1,
                                               TGSI_CHAN_X);
                offset_y = lp_build_emit_fetch(bld_base, emit_data->inst, 1,
                                               TGSI_CHAN_Y);
        } else if (inst->Instruction.Opcode == TGSI_OPCODE_INTERP_SAMPLE) {
                LLVMValueRef sample_position;
                LLVMValueRef sample_id;
                LLVMValueRef halfval = LLVMConstReal(ctx->f32, 0.5f);

                /* fetch sample ID, then fetch its sample position,
                 * and place into first two channels.
                 */
                sample_id = lp_build_emit_fetch(bld_base,
                                                emit_data->inst, 1, TGSI_CHAN_X);
                sample_id = ac_to_integer(&ctx->ac, sample_id);

                /* Section 8.13.2 (Interpolation Functions) of the OpenGL Shading
                 * Language 4.50 spec says about interpolateAtSample:
                 *
                 *    "Returns the value of the input interpolant variable at
                 *     the location of sample number sample. If multisample
                 *     buffers are not available, the input variable will be
                 *     evaluated at the center of the pixel. If sample sample
                 *     does not exist, the position used to interpolate the
                 *     input variable is undefined."
                 *
                 * This means that sample_id values outside of the valid are
                 * in fact valid input, and the usual mechanism for loading the
                 * sample position doesn't work.
                 */
                if (ctx->shader->key.mono.u.ps.interpolate_at_sample_force_center) {
                        LLVMValueRef center[4] = {
                                LLVMConstReal(ctx->f32, 0.5),
                                LLVMConstReal(ctx->f32, 0.5),
                                ctx->ac.f32_0,
                                ctx->ac.f32_0,
                        };

                        sample_position = ac_build_gather_values(&ctx->ac, center, 4);
                } else {
                        sample_position = load_sample_position(&ctx->abi, sample_id);
                }

                offset_x = LLVMBuildExtractElement(ctx->ac.builder, sample_position,
                                                   ctx->i32_0, "");

                offset_x = LLVMBuildFSub(ctx->ac.builder, offset_x, halfval, "");
                offset_y = LLVMBuildExtractElement(ctx->ac.builder, sample_position,
                                                   ctx->i32_1, "");
                offset_y = LLVMBuildFSub(ctx->ac.builder, offset_y, halfval, "");
        }

        assert(input->Register.File == TGSI_FILE_INPUT);

        if (input->Register.Indirect) {
                unsigned array_id = input->Indirect.ArrayID;

                if (array_id) {
                        input_base = info->input_array_first[array_id];
                        input_array_size = info->input_array_last[array_id] - input_base + 1;
                } else {
                        input_base = inst->Src[0].Register.Index;
                        input_array_size = info->num_inputs - input_base;
                }

                array_idx = si_get_indirect_index(ctx, &input->Indirect,
                                                  1, input->Register.Index - input_base);
        } else {
                input_base = inst->Src[0].Register.Index;
                input_array_size = 1;
                array_idx = ctx->i32_0;
        }

        interp = shader->selector->info.input_interpolate[input_base];

        if (inst->Instruction.Opcode == TGSI_OPCODE_INTERP_OFFSET ||
            inst->Instruction.Opcode == TGSI_OPCODE_INTERP_SAMPLE)
                location = TGSI_INTERPOLATE_LOC_CENTER;
        else
                location = TGSI_INTERPOLATE_LOC_CENTROID;

        interp_param_idx = lookup_interp_param_index(interp, location);
        if (interp_param_idx == -1)
                return;
        else if (interp_param_idx)
                interp_param = LLVMGetParam(ctx->main_fn, interp_param_idx);
        else
                interp_param = NULL;

        if (inst->Instruction.Opcode == TGSI_OPCODE_INTERP_OFFSET ||
            inst->Instruction.Opcode == TGSI_OPCODE_INTERP_SAMPLE) {
                LLVMValueRef ij_out[2];
                LLVMValueRef ddxy_out = ac_build_ddxy_interp(&ctx->ac, interp_param);

                /*
                 * take the I then J parameters, and the DDX/Y for it, and
                 * calculate the IJ inputs for the interpolator.
                 * temp1 = ddx * offset/sample.x + I;
                 * interp_param.I = ddy * offset/sample.y + temp1;
                 * temp1 = ddx * offset/sample.x + J;
                 * interp_param.J = ddy * offset/sample.y + temp1;
                 */
                for (i = 0; i < 2; i++) {
                        LLVMValueRef ix_ll = LLVMConstInt(ctx->i32, i, 0);
                        LLVMValueRef iy_ll = LLVMConstInt(ctx->i32, i + 2, 0);
                        LLVMValueRef ddx_el = LLVMBuildExtractElement(ctx->ac.builder,
                                                                      ddxy_out, ix_ll, "");
                        LLVMValueRef ddy_el = LLVMBuildExtractElement(ctx->ac.builder,
                                                                      ddxy_out, iy_ll, "");
                        LLVMValueRef interp_el = LLVMBuildExtractElement(ctx->ac.builder,
                                                                         interp_param, ix_ll, "");
                        LLVMValueRef temp;

                        interp_el = ac_to_float(&ctx->ac, interp_el);

                        temp = ac_build_fmad(&ctx->ac, ddx_el, offset_x, interp_el);
                        ij_out[i] = ac_build_fmad(&ctx->ac, ddy_el, offset_y, temp);
                }
                interp_param = ac_build_gather_values(&ctx->ac, ij_out, 2);
        }

        if (interp_param)
                interp_param = ac_to_float(&ctx->ac, interp_param);

        for (chan = 0; chan < 4; chan++) {
                LLVMValueRef gather = LLVMGetUndef(LLVMVectorType(ctx->f32, input_array_size));
                unsigned schan = tgsi_util_get_full_src_register_swizzle(&inst->Src[0], chan);

                for (unsigned idx = 0; idx < input_array_size; ++idx) {
                        LLVMValueRef v, i = NULL, j = NULL;

                        if (interp_param) {
                                i = LLVMBuildExtractElement(
                                        ctx->ac.builder, interp_param, ctx->i32_0, "");
                                j = LLVMBuildExtractElement(
                                        ctx->ac.builder, interp_param, ctx->i32_1, "");
                        }
                        v = si_build_fs_interp(ctx, input_base + idx, schan,
                                               prim_mask, i, j);

                        gather = LLVMBuildInsertElement(ctx->ac.builder,
                                gather, v, LLVMConstInt(ctx->i32, idx, false), "");
                }

                emit_data->output[chan] = LLVMBuildExtractElement(
                        ctx->ac.builder, gather, array_idx, "");
        }
}

static void vote_all_emit(
        const struct lp_build_tgsi_action *action,
        struct lp_build_tgsi_context *bld_base,
        struct lp_build_emit_data *emit_data)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);

        LLVMValueRef tmp = ac_build_vote_all(&ctx->ac, emit_data->args[0]);
        emit_data->output[emit_data->chan] =
                LLVMBuildSExt(ctx->ac.builder, tmp, ctx->i32, "");
}

static void vote_any_emit(
        const struct lp_build_tgsi_action *action,
        struct lp_build_tgsi_context *bld_base,
        struct lp_build_emit_data *emit_data)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);

        LLVMValueRef tmp = ac_build_vote_any(&ctx->ac, emit_data->args[0]);
        emit_data->output[emit_data->chan] =
                LLVMBuildSExt(ctx->ac.builder, tmp, ctx->i32, "");
}

static void vote_eq_emit(
        const struct lp_build_tgsi_action *action,
        struct lp_build_tgsi_context *bld_base,
        struct lp_build_emit_data *emit_data)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);

        LLVMValueRef tmp = ac_build_vote_eq(&ctx->ac, emit_data->args[0]);
        emit_data->output[emit_data->chan] =
                LLVMBuildSExt(ctx->ac.builder, tmp, ctx->i32, "");
}

static void ballot_emit(
        const struct lp_build_tgsi_action *action,
        struct lp_build_tgsi_context *bld_base,
        struct lp_build_emit_data *emit_data)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        LLVMBuilderRef builder = ctx->ac.builder;
        LLVMValueRef tmp;

        tmp = lp_build_emit_fetch(bld_base, emit_data->inst, 0, TGSI_CHAN_X);
        tmp = ac_build_ballot(&ctx->ac, tmp);
        tmp = LLVMBuildBitCast(builder, tmp, ctx->v2i32, "");

        emit_data->output[0] = LLVMBuildExtractElement(builder, tmp, ctx->i32_0, "");
        emit_data->output[1] = LLVMBuildExtractElement(builder, tmp, ctx->i32_1, "");
}

static void read_lane_emit(
        const struct lp_build_tgsi_action *action,
        struct lp_build_tgsi_context *bld_base,
        struct lp_build_emit_data *emit_data)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);

        if (emit_data->inst->Instruction.Opcode == TGSI_OPCODE_READ_INVOC) {
                emit_data->args[0] = lp_build_emit_fetch(bld_base, emit_data->inst,
                                                         0, emit_data->src_chan);

                /* Always read the source invocation (= lane) from the X channel. */
                emit_data->args[1] = lp_build_emit_fetch(bld_base, emit_data->inst,
                                                         1, TGSI_CHAN_X);
                emit_data->arg_count = 2;
        }

        /* We currently have no other way to prevent LLVM from lifting the icmp
         * calls to a dominating basic block.
         */
        ac_build_optimization_barrier(&ctx->ac, &emit_data->args[0]);

        for (unsigned i = 0; i < emit_data->arg_count; ++i)
                emit_data->args[i] = ac_to_integer(&ctx->ac, emit_data->args[i]);

        emit_data->output[emit_data->chan] =
                ac_build_intrinsic(&ctx->ac, action->intr_name,
                                   ctx->i32, emit_data->args, emit_data->arg_count,
                                   AC_FUNC_ATTR_READNONE |
                                   AC_FUNC_ATTR_CONVERGENT);
}

static unsigned si_llvm_get_stream(struct lp_build_tgsi_context *bld_base,
                                       struct lp_build_emit_data *emit_data)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        struct tgsi_src_register src0 = emit_data->inst->Src[0].Register;
        LLVMValueRef imm;
        unsigned stream;

        assert(src0.File == TGSI_FILE_IMMEDIATE);

        imm = ctx->imms[src0.Index * TGSI_NUM_CHANNELS + src0.SwizzleX];
        stream = LLVMConstIntGetZExtValue(imm) & 0x3;
        return stream;
}

/* Emit one vertex from the geometry shader */
static void si_llvm_emit_vertex(struct ac_shader_abi *abi,
                                unsigned stream,
                                LLVMValueRef *addrs)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);
        struct tgsi_shader_info *info = &ctx->shader->selector->info;
        struct si_shader *shader = ctx->shader;
        struct lp_build_if_state if_state;
        LLVMValueRef soffset = LLVMGetParam(ctx->main_fn,
                                            ctx->param_gs2vs_offset);
        LLVMValueRef gs_next_vertex;
        LLVMValueRef can_emit;
        unsigned chan, offset;
        int i;

        /* Write vertex attribute values to GSVS ring */
        gs_next_vertex = LLVMBuildLoad(ctx->ac.builder,
                                       ctx->gs_next_vertex[stream],
                                       "");

        /* If this thread has already emitted the declared maximum number of
         * vertices, skip the write: excessive vertex emissions are not
         * supposed to have any effect.
         *
         * If the shader has no writes to memory, kill it instead. This skips
         * further memory loads and may allow LLVM to skip to the end
         * altogether.
         */
        can_emit = LLVMBuildICmp(ctx->ac.builder, LLVMIntULT, gs_next_vertex,
                                 LLVMConstInt(ctx->i32,
                                              shader->selector->gs_max_out_vertices, 0), "");

        bool use_kill = !info->writes_memory;
        if (use_kill) {
                ac_build_kill_if_false(&ctx->ac, can_emit);
        } else {
                lp_build_if(&if_state, &ctx->gallivm, can_emit);
        }

        offset = 0;
        for (i = 0; i < info->num_outputs; i++) {
                for (chan = 0; chan < 4; chan++) {
                        if (!(info->output_usagemask[i] & (1 << chan)) ||
                            ((info->output_streams[i] >> (2 * chan)) & 3) != stream)
                                continue;

                        LLVMValueRef out_val = LLVMBuildLoad(ctx->ac.builder, addrs[4 * i + chan], "");
                        LLVMValueRef voffset =
                                LLVMConstInt(ctx->i32, offset *
                                             shader->selector->gs_max_out_vertices, 0);
                        offset++;

                        voffset = LLVMBuildAdd(ctx->ac.builder, voffset, gs_next_vertex, "");
                        voffset = LLVMBuildMul(ctx->ac.builder, voffset,
                                               LLVMConstInt(ctx->i32, 4, 0), "");

                        out_val = ac_to_integer(&ctx->ac, out_val);

                        ac_build_buffer_store_dword(&ctx->ac,
                                                    ctx->gsvs_ring[stream],
                                                    out_val, 1,
                                                    voffset, soffset, 0,
                                                    1, 1, true, true);
                }
        }

        gs_next_vertex = LLVMBuildAdd(ctx->ac.builder, gs_next_vertex, ctx->i32_1, "");
        LLVMBuildStore(ctx->ac.builder, gs_next_vertex, ctx->gs_next_vertex[stream]);

        /* Signal vertex emission if vertex data was written. */
        if (offset) {
                ac_build_sendmsg(&ctx->ac, AC_SENDMSG_GS_OP_EMIT | AC_SENDMSG_GS | (stream << 8),
                                 si_get_gs_wave_id(ctx));
        }

        if (!use_kill)
                lp_build_endif(&if_state);
}

/* Emit one vertex from the geometry shader */
static void si_tgsi_emit_vertex(
        const struct lp_build_tgsi_action *action,
        struct lp_build_tgsi_context *bld_base,
        struct lp_build_emit_data *emit_data)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);
        unsigned stream = si_llvm_get_stream(bld_base, emit_data);

        si_llvm_emit_vertex(&ctx->abi, stream, ctx->outputs[0]);
}

/* Cut one primitive from the geometry shader */
static void si_llvm_emit_primitive(struct ac_shader_abi *abi,
                                   unsigned stream)
{
        struct si_shader_context *ctx = si_shader_context_from_abi(abi);

        /* Signal primitive cut */
        ac_build_sendmsg(&ctx->ac, AC_SENDMSG_GS_OP_CUT | AC_SENDMSG_GS | (stream << 8),
                         si_get_gs_wave_id(ctx));
}

/* Cut one primitive from the geometry shader */
static void si_tgsi_emit_primitive(
        const struct lp_build_tgsi_action *action,
        struct lp_build_tgsi_context *bld_base,
        struct lp_build_emit_data *emit_data)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);

        si_llvm_emit_primitive(&ctx->abi, si_llvm_get_stream(bld_base, emit_data));
}

static void si_llvm_emit_barrier(const struct lp_build_tgsi_action *action,
                                 struct lp_build_tgsi_context *bld_base,
                                 struct lp_build_emit_data *emit_data)
{
        struct si_shader_context *ctx = si_shader_context(bld_base);

        /* GFX6 only (thanks to a hw bug workaround):
         * The real barrier instruction isn’t needed, because an entire patch
         * always fits into a single wave.
         */
        if (ctx->screen->info.chip_class == GFX6 &&
            ctx->type == PIPE_SHADER_TESS_CTRL) {
                ac_build_waitcnt(&ctx->ac, LGKM_CNT & VM_CNT);
                return;
        }

        ac_build_s_barrier(&ctx->ac);
}

void si_create_function(struct si_shader_context *ctx,
                        const char *name,
                        LLVMTypeRef *returns, unsigned num_returns,
                        struct si_function_info *fninfo,
                        unsigned max_workgroup_size)
{
        int i;

        si_llvm_create_func(ctx, name, returns, num_returns,
                            fninfo->types, fninfo->num_params);
        ctx->return_value = LLVMGetUndef(ctx->return_type);

        for (i = 0; i < fninfo->num_sgpr_params; ++i) {
                LLVMValueRef P = LLVMGetParam(ctx->main_fn, i);

                /* The combination of:
                 * - noalias
                 * - dereferenceable
                 * - invariant.load
                 * allows the optimization passes to move loads and reduces
                 * SGPR spilling significantly.
                 */
                ac_add_function_attr(ctx->ac.context, ctx->main_fn, i + 1,
                                     AC_FUNC_ATTR_INREG);

                if (LLVMGetTypeKind(LLVMTypeOf(P)) == LLVMPointerTypeKind) {
                        ac_add_function_attr(ctx->ac.context, ctx->main_fn, i + 1,
                                             AC_FUNC_ATTR_NOALIAS);
                        ac_add_attr_dereferenceable(P, UINT64_MAX);
                }
        }

        for (i = 0; i < fninfo->num_params; ++i) {
                if (fninfo->assign[i])
                        *fninfo->assign[i] = LLVMGetParam(ctx->main_fn, i);
        }

        if (ctx->screen->info.address32_hi) {
                ac_llvm_add_target_dep_function_attr(ctx->main_fn,
                                                     "amdgpu-32bit-address-high-bits",
                                                     ctx->screen->info.address32_hi);
        }

        if (max_workgroup_size) {
                ac_llvm_add_target_dep_function_attr(ctx->main_fn,
                                                     "amdgpu-max-work-group-size",
                                                     max_workgroup_size);
        }
        LLVMAddTargetDependentFunctionAttr(ctx->main_fn,
                                           "no-signed-zeros-fp-math",
                                           "true");

        if (ctx->screen->debug_flags & DBG(UNSAFE_MATH)) {
                /* These were copied from some LLVM test. */
                LLVMAddTargetDependentFunctionAttr(ctx->main_fn,
                                                   "less-precise-fpmad",
                                                   "true");
                LLVMAddTargetDependentFunctionAttr(ctx->main_fn,
                                                   "no-infs-fp-math",
                                                   "true");
                LLVMAddTargetDependentFunctionAttr(ctx->main_fn,
                                                   "no-nans-fp-math",
                                                   "true");
                LLVMAddTargetDependentFunctionAttr(ctx->main_fn,
                                                   "unsafe-fp-math",
                                                   "true");
        }
}

static void declare_streamout_params(struct si_shader_context *ctx,
                                     struct pipe_stream_output_info *so,
                                     struct si_function_info *fninfo)
{
        int i;

        /* Streamout SGPRs. */
        if (so->num_outputs) {
                if (ctx->type != PIPE_SHADER_TESS_EVAL)
                        ctx->param_streamout_config = add_arg(fninfo, ARG_SGPR, ctx->ac.i32);
                else
                        ctx->param_streamout_config = fninfo->num_params - 1;

                ctx->param_streamout_write_index = add_arg(fninfo, ARG_SGPR, ctx->ac.i32);
        }
        /* A streamout buffer offset is loaded if the stride is non-zero. */
        for (i = 0; i < 4; i++) {
                if (!so->stride[i])
                        continue;

                ctx->param_streamout_offset[i] = add_arg(fninfo, ARG_SGPR, ctx->ac.i32);
        }
}

static unsigned si_get_max_workgroup_size(const struct si_shader *shader)
{
        switch (shader->selector->type) {
        case PIPE_SHADER_TESS_CTRL:
                /* Return this so that LLVM doesn't remove s_barrier
                 * instructions on chips where we use s_barrier. */
                return shader->selector->screen->info.chip_class >= GFX7 ? 128 : 64;

        case PIPE_SHADER_GEOMETRY:
                return shader->selector->screen->info.chip_class >= GFX9 ? 128 : 64;

        case PIPE_SHADER_COMPUTE:
                break; /* see below */

        default:
                return 0;
        }

        const unsigned *properties = shader->selector->info.properties;
        unsigned max_work_group_size =
                       properties[TGSI_PROPERTY_CS_FIXED_BLOCK_WIDTH] *
                       properties[TGSI_PROPERTY_CS_FIXED_BLOCK_HEIGHT] *
                       properties[TGSI_PROPERTY_CS_FIXED_BLOCK_DEPTH];

        if (!max_work_group_size) {
                /* This is a variable group size compute shader,
                 * compile it for the maximum possible group size.
                 */
                max_work_group_size = SI_MAX_VARIABLE_THREADS_PER_BLOCK;
        }
        return max_work_group_size;
}

static void declare_const_and_shader_buffers(struct si_shader_context *ctx,
                                             struct si_function_info *fninfo,
                                             bool assign_params)
{
        LLVMTypeRef const_shader_buf_type;

        if (ctx->shader->selector->info.const_buffers_declared == 1 &&
            ctx->shader->selector->info.shader_buffers_declared == 0)
                const_shader_buf_type = ctx->f32;
        else
                const_shader_buf_type = ctx->v4i32;

        unsigned const_and_shader_buffers =
                add_arg(fninfo, ARG_SGPR,
                        ac_array_in_const32_addr_space(const_shader_buf_type));

        if (assign_params)
                ctx->param_const_and_shader_buffers = const_and_shader_buffers;
}

static void declare_samplers_and_images(struct si_shader_context *ctx,
                                        struct si_function_info *fninfo,
                                        bool assign_params)
{
        unsigned samplers_and_images =
                add_arg(fninfo, ARG_SGPR,
                        ac_array_in_const32_addr_space(ctx->v8i32));

        if (assign_params)
                ctx->param_samplers_and_images = samplers_and_images;
}

static void declare_per_stage_desc_pointers(struct si_shader_context *ctx,
                                            struct si_function_info *fninfo,
                                            bool assign_params)
{
        declare_const_and_shader_buffers(ctx, fninfo, assign_params);
        declare_samplers_and_images(ctx, fninfo, assign_params);
}

static void declare_global_desc_pointers(struct si_shader_context *ctx,
                                         struct si_function_info *fninfo)
{
        ctx->param_rw_buffers = add_arg(fninfo, ARG_SGPR,
                ac_array_in_const32_addr_space(ctx->v4i32));
        ctx->param_bindless_samplers_and_images = add_arg(fninfo, ARG_SGPR,
                ac_array_in_const32_addr_space(ctx->v8i32));
}

static void declare_vs_specific_input_sgprs(struct si_shader_context *ctx,
                                            struct si_function_info *fninfo)
{
        ctx->param_vs_state_bits = add_arg(fninfo, ARG_SGPR, ctx->i32);
        add_arg_assign(fninfo, ARG_SGPR, ctx->i32, &ctx->abi.base_vertex);
        add_arg_assign(fninfo, ARG_SGPR, ctx->i32, &ctx->abi.start_instance);
        add_arg_assign(fninfo, ARG_SGPR, ctx->i32, &ctx->abi.draw_id);
}

static void declare_vs_input_vgprs(struct si_shader_context *ctx,
                                   struct si_function_info *fninfo,
                                   unsigned *num_prolog_vgprs)
{
        struct si_shader *shader = ctx->shader;

        add_arg_assign(fninfo, ARG_VGPR, ctx->i32, &ctx->abi.vertex_id);
        if (shader->key.as_ls) {
                ctx->param_rel_auto_id = add_arg(fninfo, ARG_VGPR, ctx->i32);
                add_arg_assign(fninfo, ARG_VGPR, ctx->i32, &ctx->abi.instance_id);
        } else {
                add_arg_assign(fninfo, ARG_VGPR, ctx->i32, &ctx->abi.instance_id);
                ctx->param_vs_prim_id = add_arg(fninfo, ARG_VGPR, ctx->i32);
        }
        add_arg(fninfo, ARG_VGPR, ctx->i32); /* unused */

        if (!shader->is_gs_copy_shader) {
                /* Vertex load indices. */
                ctx->param_vertex_index0 = fninfo->num_params;
                for (unsigned i = 0; i < shader->selector->info.num_inputs; i++)
                        add_arg(fninfo, ARG_VGPR, ctx->i32);
                *num_prolog_vgprs += shader->selector->info.num_inputs;
        }
}

static void declare_vs_blit_inputs(struct si_shader_context *ctx,
                                   struct si_function_info *fninfo,
                                   unsigned vs_blit_property)
{
        ctx->param_vs_blit_inputs = fninfo->num_params;
        add_arg(fninfo, ARG_SGPR, ctx->i32); /* i16 x1, y1 */
        add_arg(fninfo, ARG_SGPR, ctx->i32); /* i16 x2, y2 */
        add_arg(fninfo, ARG_SGPR, ctx->f32); /* depth */

        if (vs_blit_property == SI_VS_BLIT_SGPRS_POS_COLOR) {
                add_arg(fninfo, ARG_SGPR, ctx->f32); /* color0 */
                add_arg(fninfo, ARG_SGPR, ctx->f32); /* color1 */
                add_arg(fninfo, ARG_SGPR, ctx->f32); /* color2 */
                add_arg(fninfo, ARG_SGPR, ctx->f32); /* color3 */
        } else if (vs_blit_property == SI_VS_BLIT_SGPRS_POS_TEXCOORD) {
                add_arg(fninfo, ARG_SGPR, ctx->f32); /* texcoord.x1 */
                add_arg(fninfo, ARG_SGPR, ctx->f32); /* texcoord.y1 */
                add_arg(fninfo, ARG_SGPR, ctx->f32); /* texcoord.x2 */
                add_arg(fninfo, ARG_SGPR, ctx->f32); /* texcoord.y2 */
                add_arg(fninfo, ARG_SGPR, ctx->f32); /* texcoord.z */
                add_arg(fninfo, ARG_SGPR, ctx->f32); /* texcoord.w */
        }
}

static void declare_tes_input_vgprs(struct si_shader_context *ctx,
                                    struct si_function_info *fninfo)
{
        ctx->param_tes_u = add_arg(fninfo, ARG_VGPR, ctx->f32);
        ctx->param_tes_v = add_arg(fninfo, ARG_VGPR, ctx->f32);
        ctx->param_tes_rel_patch_id = add_arg(fninfo, ARG_VGPR, ctx->i32);
        add_arg_assign(fninfo, ARG_VGPR, ctx->i32, &ctx->abi.tes_patch_id);
}

enum {
        /* Convenient merged shader definitions. */
        SI_SHADER_MERGED_VERTEX_TESSCTRL = PIPE_SHADER_TYPES,
        SI_SHADER_MERGED_VERTEX_OR_TESSEVAL_GEOMETRY,
};

static void create_function(struct si_shader_context *ctx)
{
        struct si_shader *shader = ctx->shader;
        struct si_function_info fninfo;
        LLVMTypeRef returns[16+32*4];
        unsigned i, num_return_sgprs;
        unsigned num_returns = 0;
        unsigned num_prolog_vgprs = 0;
        unsigned type = ctx->type;
        unsigned vs_blit_property =
                shader->selector->info.properties[TGSI_PROPERTY_VS_BLIT_SGPRS];

        si_init_function_info(&fninfo);

        /* Set MERGED shaders. */
        if (ctx->screen->info.chip_class >= GFX9) {
                if (shader->key.as_ls || type == PIPE_SHADER_TESS_CTRL)
                        type = SI_SHADER_MERGED_VERTEX_TESSCTRL; /* LS or HS */
                else if (shader->key.as_es || type == PIPE_SHADER_GEOMETRY)
                        type = SI_SHADER_MERGED_VERTEX_OR_TESSEVAL_GEOMETRY;
        }

        LLVMTypeRef v3i32 = LLVMVectorType(ctx->i32, 3);

        switch (type) {
        case PIPE_SHADER_VERTEX:
                declare_global_desc_pointers(ctx, &fninfo);

                if (vs_blit_property) {
                        declare_vs_blit_inputs(ctx, &fninfo, vs_blit_property);

                        /* VGPRs */
                        declare_vs_input_vgprs(ctx, &fninfo, &num_prolog_vgprs);
                        break;
                }

                declare_per_stage_desc_pointers(ctx, &fninfo, true);
                declare_vs_specific_input_sgprs(ctx, &fninfo);
                ctx->param_vertex_buffers = add_arg(&fninfo, ARG_SGPR,
                        ac_array_in_const32_addr_space(ctx->v4i32));

                if (shader->key.as_es) {
                        ctx->param_es2gs_offset = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                } else if (shader->key.as_ls) {
                        /* no extra parameters */
                } else {
                        if (shader->is_gs_copy_shader) {
                                fninfo.num_params = ctx->param_vs_state_bits + 1;
                                fninfo.num_sgpr_params = fninfo.num_params;
                        }

                        /* The locations of the other parameters are assigned dynamically. */
                        declare_streamout_params(ctx, &shader->selector->so,
                                                 &fninfo);
                }

                /* VGPRs */
                declare_vs_input_vgprs(ctx, &fninfo, &num_prolog_vgprs);
                break;

        case PIPE_SHADER_TESS_CTRL: /* GFX6-GFX8 */
                declare_global_desc_pointers(ctx, &fninfo);
                declare_per_stage_desc_pointers(ctx, &fninfo, true);
                ctx->param_tcs_offchip_layout = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_tcs_out_lds_offsets = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_tcs_out_lds_layout = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_vs_state_bits = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_tcs_offchip_offset = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_tcs_factor_offset = add_arg(&fninfo, ARG_SGPR, ctx->i32);

                /* VGPRs */
                add_arg_assign(&fninfo, ARG_VGPR, ctx->i32, &ctx->abi.tcs_patch_id);
                add_arg_assign(&fninfo, ARG_VGPR, ctx->i32, &ctx->abi.tcs_rel_ids);

                /* param_tcs_offchip_offset and param_tcs_factor_offset are
                 * placed after the user SGPRs.
                 */
                for (i = 0; i < GFX6_TCS_NUM_USER_SGPR + 2; i++)
                        returns[num_returns++] = ctx->i32; /* SGPRs */
                for (i = 0; i < 11; i++)
                        returns[num_returns++] = ctx->f32; /* VGPRs */
                break;

        case SI_SHADER_MERGED_VERTEX_TESSCTRL:
                /* Merged stages have 8 system SGPRs at the beginning. */
                /* SPI_SHADER_USER_DATA_ADDR_LO/HI_HS */
                declare_per_stage_desc_pointers(ctx, &fninfo,
                                                ctx->type == PIPE_SHADER_TESS_CTRL);
                ctx->param_tcs_offchip_offset = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_merged_wave_info = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_tcs_factor_offset = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_merged_scratch_offset = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                add_arg(&fninfo, ARG_SGPR, ctx->i32); /* unused */
                add_arg(&fninfo, ARG_SGPR, ctx->i32); /* unused */

                declare_global_desc_pointers(ctx, &fninfo);
                declare_per_stage_desc_pointers(ctx, &fninfo,
                                                ctx->type == PIPE_SHADER_VERTEX);
                declare_vs_specific_input_sgprs(ctx, &fninfo);

                ctx->param_tcs_offchip_layout = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_tcs_out_lds_offsets = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_tcs_out_lds_layout = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_vertex_buffers = add_arg(&fninfo, ARG_SGPR,
                        ac_array_in_const32_addr_space(ctx->v4i32));

                /* VGPRs (first TCS, then VS) */
                add_arg_assign(&fninfo, ARG_VGPR, ctx->i32, &ctx->abi.tcs_patch_id);
                add_arg_assign(&fninfo, ARG_VGPR, ctx->i32, &ctx->abi.tcs_rel_ids);

                if (ctx->type == PIPE_SHADER_VERTEX) {
                        declare_vs_input_vgprs(ctx, &fninfo,
                                               &num_prolog_vgprs);

                        /* LS return values are inputs to the TCS main shader part. */
                        for (i = 0; i < 8 + GFX9_TCS_NUM_USER_SGPR; i++)
                                returns[num_returns++] = ctx->i32; /* SGPRs */
                        for (i = 0; i < 2; i++)
                                returns[num_returns++] = ctx->f32; /* VGPRs */
                } else {
                        /* TCS return values are inputs to the TCS epilog.
                         *
                         * param_tcs_offchip_offset, param_tcs_factor_offset,
                         * param_tcs_offchip_layout, and param_rw_buffers
                         * should be passed to the epilog.
                         */
                        for (i = 0; i <= 8 + GFX9_SGPR_TCS_OUT_LAYOUT; i++)
                                returns[num_returns++] = ctx->i32; /* SGPRs */
                        for (i = 0; i < 11; i++)
                                returns[num_returns++] = ctx->f32; /* VGPRs */
                }
                break;

        case SI_SHADER_MERGED_VERTEX_OR_TESSEVAL_GEOMETRY:
                /* Merged stages have 8 system SGPRs at the beginning. */
                /* SPI_SHADER_USER_DATA_ADDR_LO/HI_GS */
                declare_per_stage_desc_pointers(ctx, &fninfo,
                                                ctx->type == PIPE_SHADER_GEOMETRY);
                ctx->param_gs2vs_offset = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_merged_wave_info = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_tcs_offchip_offset = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_merged_scratch_offset = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                add_arg(&fninfo, ARG_SGPR, ctx->i32); /* unused (SPI_SHADER_PGM_LO/HI_GS << 8) */
                add_arg(&fninfo, ARG_SGPR, ctx->i32); /* unused (SPI_SHADER_PGM_LO/HI_GS >> 24) */

                declare_global_desc_pointers(ctx, &fninfo);
                declare_per_stage_desc_pointers(ctx, &fninfo,
                                                (ctx->type == PIPE_SHADER_VERTEX ||
                                                 ctx->type == PIPE_SHADER_TESS_EVAL));
                if (ctx->type == PIPE_SHADER_VERTEX) {
                        declare_vs_specific_input_sgprs(ctx, &fninfo);
                } else {
                        ctx->param_vs_state_bits = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                        ctx->param_tcs_offchip_layout = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                        ctx->param_tes_offchip_addr = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                        /* Declare as many input SGPRs as the VS has. */
                }

                if (ctx->type == PIPE_SHADER_VERTEX) {
                        ctx->param_vertex_buffers = add_arg(&fninfo, ARG_SGPR,
                                ac_array_in_const32_addr_space(ctx->v4i32));
                }

                /* VGPRs (first GS, then VS/TES) */
                ctx->param_gs_vtx01_offset = add_arg(&fninfo, ARG_VGPR, ctx->i32);
                ctx->param_gs_vtx23_offset = add_arg(&fninfo, ARG_VGPR, ctx->i32);
                add_arg_assign(&fninfo, ARG_VGPR, ctx->i32, &ctx->abi.gs_prim_id);
                add_arg_assign(&fninfo, ARG_VGPR, ctx->i32, &ctx->abi.gs_invocation_id);
                ctx->param_gs_vtx45_offset = add_arg(&fninfo, ARG_VGPR, ctx->i32);

                if (ctx->type == PIPE_SHADER_VERTEX) {
                        declare_vs_input_vgprs(ctx, &fninfo,
                                               &num_prolog_vgprs);
                } else if (ctx->type == PIPE_SHADER_TESS_EVAL) {
                        declare_tes_input_vgprs(ctx, &fninfo);
                }

                if (ctx->type == PIPE_SHADER_VERTEX ||
                    ctx->type == PIPE_SHADER_TESS_EVAL) {
                        unsigned num_user_sgprs;

                        if (ctx->type == PIPE_SHADER_VERTEX)
                                num_user_sgprs = GFX9_VSGS_NUM_USER_SGPR;
                        else
                                num_user_sgprs = GFX9_TESGS_NUM_USER_SGPR;

                        /* ES return values are inputs to GS. */
                        for (i = 0; i < 8 + num_user_sgprs; i++)
                                returns[num_returns++] = ctx->i32; /* SGPRs */
                        for (i = 0; i < 5; i++)
                                returns[num_returns++] = ctx->f32; /* VGPRs */
                }
                break;

        case PIPE_SHADER_TESS_EVAL:
                declare_global_desc_pointers(ctx, &fninfo);
                declare_per_stage_desc_pointers(ctx, &fninfo, true);
                ctx->param_vs_state_bits = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_tcs_offchip_layout = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_tes_offchip_addr = add_arg(&fninfo, ARG_SGPR, ctx->i32);

                if (shader->key.as_es) {
                        ctx->param_tcs_offchip_offset = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                        add_arg(&fninfo, ARG_SGPR, ctx->i32);
                        ctx->param_es2gs_offset = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                } else {
                        add_arg(&fninfo, ARG_SGPR, ctx->i32);
                        declare_streamout_params(ctx, &shader->selector->so,
                                                 &fninfo);
                        ctx->param_tcs_offchip_offset = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                }

                /* VGPRs */
                declare_tes_input_vgprs(ctx, &fninfo);
                break;

        case PIPE_SHADER_GEOMETRY:
                declare_global_desc_pointers(ctx, &fninfo);
                declare_per_stage_desc_pointers(ctx, &fninfo, true);
                ctx->param_gs2vs_offset = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_gs_wave_id = add_arg(&fninfo, ARG_SGPR, ctx->i32);

                /* VGPRs */
                add_arg_assign(&fninfo, ARG_VGPR, ctx->i32, &ctx->gs_vtx_offset[0]);
                add_arg_assign(&fninfo, ARG_VGPR, ctx->i32, &ctx->gs_vtx_offset[1]);
                add_arg_assign(&fninfo, ARG_VGPR, ctx->i32, &ctx->abi.gs_prim_id);
                add_arg_assign(&fninfo, ARG_VGPR, ctx->i32, &ctx->gs_vtx_offset[2]);
                add_arg_assign(&fninfo, ARG_VGPR, ctx->i32, &ctx->gs_vtx_offset[3]);
                add_arg_assign(&fninfo, ARG_VGPR, ctx->i32, &ctx->gs_vtx_offset[4]);
                add_arg_assign(&fninfo, ARG_VGPR, ctx->i32, &ctx->gs_vtx_offset[5]);
                add_arg_assign(&fninfo, ARG_VGPR, ctx->i32, &ctx->abi.gs_invocation_id);
                break;

        case PIPE_SHADER_FRAGMENT:
                declare_global_desc_pointers(ctx, &fninfo);
                declare_per_stage_desc_pointers(ctx, &fninfo, true);
                add_arg_checked(&fninfo, ARG_SGPR, ctx->f32, SI_PARAM_ALPHA_REF);
                add_arg_assign_checked(&fninfo, ARG_SGPR, ctx->i32,
                                       &ctx->abi.prim_mask, SI_PARAM_PRIM_MASK);

                add_arg_checked(&fninfo, ARG_VGPR, ctx->v2i32, SI_PARAM_PERSP_SAMPLE);
                add_arg_checked(&fninfo, ARG_VGPR, ctx->v2i32, SI_PARAM_PERSP_CENTER);
                add_arg_checked(&fninfo, ARG_VGPR, ctx->v2i32, SI_PARAM_PERSP_CENTROID);
                add_arg_checked(&fninfo, ARG_VGPR, v3i32, SI_PARAM_PERSP_PULL_MODEL);
                add_arg_checked(&fninfo, ARG_VGPR, ctx->v2i32, SI_PARAM_LINEAR_SAMPLE);
                add_arg_checked(&fninfo, ARG_VGPR, ctx->v2i32, SI_PARAM_LINEAR_CENTER);
                add_arg_checked(&fninfo, ARG_VGPR, ctx->v2i32, SI_PARAM_LINEAR_CENTROID);
                add_arg_checked(&fninfo, ARG_VGPR, ctx->f32, SI_PARAM_LINE_STIPPLE_TEX);
                add_arg_assign_checked(&fninfo, ARG_VGPR, ctx->f32,
                                       &ctx->abi.frag_pos[0], SI_PARAM_POS_X_FLOAT);
                add_arg_assign_checked(&fninfo, ARG_VGPR, ctx->f32,
                                       &ctx->abi.frag_pos[1], SI_PARAM_POS_Y_FLOAT);
                add_arg_assign_checked(&fninfo, ARG_VGPR, ctx->f32,
                                       &ctx->abi.frag_pos[2], SI_PARAM_POS_Z_FLOAT);
                add_arg_assign_checked(&fninfo, ARG_VGPR, ctx->f32,
                                       &ctx->abi.frag_pos[3], SI_PARAM_POS_W_FLOAT);
                add_arg_assign_checked(&fninfo, ARG_VGPR, ctx->i32,
                                       &ctx->abi.front_face, SI_PARAM_FRONT_FACE);
                shader->info.face_vgpr_index = 20;
                add_arg_assign_checked(&fninfo, ARG_VGPR, ctx->i32,
                                       &ctx->abi.ancillary, SI_PARAM_ANCILLARY);
                shader->info.ancillary_vgpr_index = 21;
                add_arg_assign_checked(&fninfo, ARG_VGPR, ctx->f32,
                                       &ctx->abi.sample_coverage, SI_PARAM_SAMPLE_COVERAGE);
                add_arg_checked(&fninfo, ARG_VGPR, ctx->i32, SI_PARAM_POS_FIXED_PT);

                /* Color inputs from the prolog. */
                if (shader->selector->info.colors_read) {
                        unsigned num_color_elements =
                                util_bitcount(shader->selector->info.colors_read);

                        assert(fninfo.num_params + num_color_elements <= ARRAY_SIZE(fninfo.types));
                        for (i = 0; i < num_color_elements; i++)
                                add_arg(&fninfo, ARG_VGPR, ctx->f32);

                        num_prolog_vgprs += num_color_elements;
                }

                /* Outputs for the epilog. */
                num_return_sgprs = SI_SGPR_ALPHA_REF + 1;
                num_returns =
                        num_return_sgprs +
                        util_bitcount(shader->selector->info.colors_written) * 4 +
                        shader->selector->info.writes_z +
                        shader->selector->info.writes_stencil +
                        shader->selector->info.writes_samplemask +
                        1 /* SampleMaskIn */;

                num_returns = MAX2(num_returns,
                                   num_return_sgprs +
                                   PS_EPILOG_SAMPLEMASK_MIN_LOC + 1);

                for (i = 0; i < num_return_sgprs; i++)
                        returns[i] = ctx->i32;
                for (; i < num_returns; i++)
                        returns[i] = ctx->f32;
                break;

        case PIPE_SHADER_COMPUTE:
                declare_global_desc_pointers(ctx, &fninfo);
                declare_per_stage_desc_pointers(ctx, &fninfo, true);
                if (shader->selector->info.uses_grid_size)
                        add_arg_assign(&fninfo, ARG_SGPR, v3i32, &ctx->abi.num_work_groups);
                if (shader->selector->info.uses_block_size &&
                    shader->selector->info.properties[TGSI_PROPERTY_CS_FIXED_BLOCK_WIDTH] == 0)
                        ctx->param_block_size = add_arg(&fninfo, ARG_SGPR, v3i32);

                unsigned cs_user_data_dwords =
                        shader->selector->info.properties[TGSI_PROPERTY_CS_USER_DATA_DWORDS];
                if (cs_user_data_dwords) {
                        ctx->param_cs_user_data = add_arg(&fninfo, ARG_SGPR,
                                                          LLVMVectorType(ctx->i32, cs_user_data_dwords));
                }

                for (i = 0; i < 3; i++) {
                        ctx->abi.workgroup_ids[i] = NULL;
                        if (shader->selector->info.uses_block_id[i])
                                add_arg_assign(&fninfo, ARG_SGPR, ctx->i32, &ctx->abi.workgroup_ids[i]);
                }

                add_arg_assign(&fninfo, ARG_VGPR, v3i32, &ctx->abi.local_invocation_ids);
                break;
        default:
                assert(0 && "unimplemented shader");
                return;
        }

        si_create_function(ctx, "main", returns, num_returns, &fninfo,
                           si_get_max_workgroup_size(shader));

        /* Reserve register locations for VGPR inputs the PS prolog may need. */
        if (ctx->type == PIPE_SHADER_FRAGMENT && !ctx->shader->is_monolithic) {
                ac_llvm_add_target_dep_function_attr(ctx->main_fn,
                                                     "InitialPSInputAddr",
                                                     S_0286D0_PERSP_SAMPLE_ENA(1) |
                                                     S_0286D0_PERSP_CENTER_ENA(1) |
                                                     S_0286D0_PERSP_CENTROID_ENA(1) |
                                                     S_0286D0_LINEAR_SAMPLE_ENA(1) |
                                                     S_0286D0_LINEAR_CENTER_ENA(1) |
                                                     S_0286D0_LINEAR_CENTROID_ENA(1) |
                                                     S_0286D0_FRONT_FACE_ENA(1) |
                                                     S_0286D0_ANCILLARY_ENA(1) |
                                                     S_0286D0_POS_FIXED_PT_ENA(1));
        }

        shader->info.num_input_sgprs = 0;
        shader->info.num_input_vgprs = 0;

        for (i = 0; i < fninfo.num_sgpr_params; ++i)
                shader->info.num_input_sgprs += ac_get_type_size(fninfo.types[i]) / 4;

        for (; i < fninfo.num_params; ++i)
                shader->info.num_input_vgprs += ac_get_type_size(fninfo.types[i]) / 4;

        assert(shader->info.num_input_vgprs >= num_prolog_vgprs);
        shader->info.num_input_vgprs -= num_prolog_vgprs;

        if (shader->key.as_ls ||
            ctx->type == PIPE_SHADER_TESS_CTRL ||
            /* GFX9 has the ESGS ring buffer in LDS. */
            type == SI_SHADER_MERGED_VERTEX_OR_TESSEVAL_GEOMETRY)
                ac_declare_lds_as_pointer(&ctx->ac);
}

/**
 * Load ESGS and GSVS ring buffer resource descriptors and save the variables
 * for later use.
 */
static void preload_ring_buffers(struct si_shader_context *ctx)
{
        LLVMBuilderRef builder = ctx->ac.builder;

        LLVMValueRef buf_ptr = LLVMGetParam(ctx->main_fn,
                                            ctx->param_rw_buffers);

        if (ctx->screen->info.chip_class <= GFX8 &&
            (ctx->shader->key.as_es || ctx->type == PIPE_SHADER_GEOMETRY)) {
                unsigned ring =
                        ctx->type == PIPE_SHADER_GEOMETRY ? SI_GS_RING_ESGS
                                                             : SI_ES_RING_ESGS;
                LLVMValueRef offset = LLVMConstInt(ctx->i32, ring, 0);

                ctx->esgs_ring =
                        ac_build_load_to_sgpr(&ctx->ac, buf_ptr, offset);
        }

        if (ctx->shader->is_gs_copy_shader) {
                LLVMValueRef offset = LLVMConstInt(ctx->i32, SI_RING_GSVS, 0);

                ctx->gsvs_ring[0] =
                        ac_build_load_to_sgpr(&ctx->ac, buf_ptr, offset);
        } else if (ctx->type == PIPE_SHADER_GEOMETRY) {
                const struct si_shader_selector *sel = ctx->shader->selector;
                LLVMValueRef offset = LLVMConstInt(ctx->i32, SI_RING_GSVS, 0);
                LLVMValueRef base_ring;

                base_ring = ac_build_load_to_sgpr(&ctx->ac, buf_ptr, offset);

                /* The conceptual layout of the GSVS ring is
                 *   v0c0 .. vLv0 v0c1 .. vLc1 ..
                 * but the real memory layout is swizzled across
                 * threads:
                 *   t0v0c0 .. t15v0c0 t0v1c0 .. t15v1c0 ... t15vLcL
                 *   t16v0c0 ..
                 * Override the buffer descriptor accordingly.
                 */
                LLVMTypeRef v2i64 = LLVMVectorType(ctx->i64, 2);
                uint64_t stream_offset = 0;

                for (unsigned stream = 0; stream < 4; ++stream) {
                        unsigned num_components;
                        unsigned stride;
                        unsigned num_records;
                        LLVMValueRef ring, tmp;

                        num_components = sel->info.num_stream_output_components[stream];
                        if (!num_components)
                                continue;

                        stride = 4 * num_components * sel->gs_max_out_vertices;

                        /* Limit on the stride field for <= GFX7. */
                        assert(stride < (1 << 14));

                        num_records = 64;

                        ring = LLVMBuildBitCast(builder, base_ring, v2i64, "");
                        tmp = LLVMBuildExtractElement(builder, ring, ctx->i32_0, "");
                        tmp = LLVMBuildAdd(builder, tmp,
                                           LLVMConstInt(ctx->i64,
                                                        stream_offset, 0), "");
                        stream_offset += stride * 64;

                        ring = LLVMBuildInsertElement(builder, ring, tmp, ctx->i32_0, "");
                        ring = LLVMBuildBitCast(builder, ring, ctx->v4i32, "");
                        tmp = LLVMBuildExtractElement(builder, ring, ctx->i32_1, "");
                        tmp = LLVMBuildOr(builder, tmp,
                                LLVMConstInt(ctx->i32,
                                             S_008F04_STRIDE(stride) |
                                             S_008F04_SWIZZLE_ENABLE(1), 0), "");
                        ring = LLVMBuildInsertElement(builder, ring, tmp, ctx->i32_1, "");
                        ring = LLVMBuildInsertElement(builder, ring,
                                        LLVMConstInt(ctx->i32, num_records, 0),
                                        LLVMConstInt(ctx->i32, 2, 0), "");
                        ring = LLVMBuildInsertElement(builder, ring,
                                LLVMConstInt(ctx->i32,
                                             S_008F0C_DST_SEL_X(V_008F0C_SQ_SEL_X) |
                                             S_008F0C_DST_SEL_Y(V_008F0C_SQ_SEL_Y) |
                                             S_008F0C_DST_SEL_Z(V_008F0C_SQ_SEL_Z) |
                                             S_008F0C_DST_SEL_W(V_008F0C_SQ_SEL_W) |
                                             S_008F0C_NUM_FORMAT(V_008F0C_BUF_NUM_FORMAT_FLOAT) |
                                             S_008F0C_DATA_FORMAT(V_008F0C_BUF_DATA_FORMAT_32) |
                                             S_008F0C_ELEMENT_SIZE(1) | /* element_size = 4 (bytes) */
                                             S_008F0C_INDEX_STRIDE(1) | /* index_stride = 16 (elements) */
                                             S_008F0C_ADD_TID_ENABLE(1),
                                             0),
                                LLVMConstInt(ctx->i32, 3, 0), "");

                        ctx->gsvs_ring[stream] = ring;
                }
        } else if (ctx->type == PIPE_SHADER_TESS_EVAL) {
                ctx->tess_offchip_ring = get_tess_ring_descriptor(ctx, TESS_OFFCHIP_RING_TES);
        }
}

static void si_llvm_emit_polygon_stipple(struct si_shader_context *ctx,
                                         LLVMValueRef param_rw_buffers,
                                         unsigned param_pos_fixed_pt)
{
        LLVMBuilderRef builder = ctx->ac.builder;
        LLVMValueRef slot, desc, offset, row, bit, address[2];

        /* Use the fixed-point gl_FragCoord input.
         * Since the stipple pattern is 32x32 and it repeats, just get 5 bits
         * per coordinate to get the repeating effect.
         */
        address[0] = si_unpack_param(ctx, param_pos_fixed_pt, 0, 5);
        address[1] = si_unpack_param(ctx, param_pos_fixed_pt, 16, 5);

        /* Load the buffer descriptor. */
        slot = LLVMConstInt(ctx->i32, SI_PS_CONST_POLY_STIPPLE, 0);
        desc = ac_build_load_to_sgpr(&ctx->ac, param_rw_buffers, slot);

        /* The stipple pattern is 32x32, each row has 32 bits. */
        offset = LLVMBuildMul(builder, address[1],
                              LLVMConstInt(ctx->i32, 4, 0), "");
        row = buffer_load_const(ctx, desc, offset);
        row = ac_to_integer(&ctx->ac, row);
        bit = LLVMBuildLShr(builder, row, address[0], "");
        bit = LLVMBuildTrunc(builder, bit, ctx->i1, "");
        ac_build_kill_if_false(&ctx->ac, bit);
}

void si_shader_binary_read_config(struct ac_shader_binary *binary,
                                  struct si_shader_config *conf,
                                  unsigned symbol_offset)
{
        unsigned i;
        const unsigned char *config =
                ac_shader_binary_config_start(binary, symbol_offset);
        bool really_needs_scratch = false;

        /* LLVM adds SGPR spills to the scratch size.
         * Find out if we really need the scratch buffer.
         */
        for (i = 0; i < binary->reloc_count; i++) {
                const struct ac_shader_reloc *reloc = &binary->relocs[i];

                if (!strcmp(scratch_rsrc_dword0_symbol, reloc->name) ||
                    !strcmp(scratch_rsrc_dword1_symbol, reloc->name)) {
                        really_needs_scratch = true;
                        break;
                }
        }

        /* XXX: We may be able to emit some of these values directly rather than
         * extracting fields to be emitted later.
         */

        for (i = 0; i < binary->config_size_per_symbol; i+= 8) {
                unsigned reg = util_le32_to_cpu(*(uint32_t*)(config + i));
                unsigned value = util_le32_to_cpu(*(uint32_t*)(config + i + 4));
                switch (reg) {
                case R_00B028_SPI_SHADER_PGM_RSRC1_PS:
                case R_00B128_SPI_SHADER_PGM_RSRC1_VS:
                case R_00B228_SPI_SHADER_PGM_RSRC1_GS:
                case R_00B428_SPI_SHADER_PGM_RSRC1_HS:
                case R_00B848_COMPUTE_PGM_RSRC1:
                        conf->num_sgprs = MAX2(conf->num_sgprs, (G_00B028_SGPRS(value) + 1) * 8);
                        conf->num_vgprs = MAX2(conf->num_vgprs, (G_00B028_VGPRS(value) + 1) * 4);
                        conf->float_mode =  G_00B028_FLOAT_MODE(value);
                        conf->rsrc1 = value;
                        break;
                case R_00B02C_SPI_SHADER_PGM_RSRC2_PS:
                        conf->lds_size = MAX2(conf->lds_size, G_00B02C_EXTRA_LDS_SIZE(value));
                        break;
                case R_00B84C_COMPUTE_PGM_RSRC2:
                        conf->lds_size = MAX2(conf->lds_size, G_00B84C_LDS_SIZE(value));
                        conf->rsrc2 = value;
                        break;
                case R_0286CC_SPI_PS_INPUT_ENA:
                        conf->spi_ps_input_ena = value;
                        break;
                case R_0286D0_SPI_PS_INPUT_ADDR:
                        conf->spi_ps_input_addr = value;
                        break;
                case R_0286E8_SPI_TMPRING_SIZE:
                case R_00B860_COMPUTE_TMPRING_SIZE:
                        /* WAVESIZE is in units of 256 dwords. */
                        if (really_needs_scratch)
                                conf->scratch_bytes_per_wave =
                                        G_00B860_WAVESIZE(value) * 256 * 4;
                        break;
                case 0x4: /* SPILLED_SGPRS */
                        conf->spilled_sgprs = value;
                        break;
                case 0x8: /* SPILLED_VGPRS */
                        conf->spilled_vgprs = value;
                        break;
                default:
                        {
                                static bool printed;

                                if (!printed) {
                                        fprintf(stderr, "Warning: LLVM emitted unknown "
                                                "config register: 0x%x\n", reg);
                                        printed = true;
                                }
                        }
                        break;
                }
        }

        if (!conf->spi_ps_input_addr)
                conf->spi_ps_input_addr = conf->spi_ps_input_ena;
}

void si_shader_apply_scratch_relocs(struct si_shader *shader,
                                    uint64_t scratch_va)
{
        unsigned i;
        uint32_t scratch_rsrc_dword0 = scratch_va;
        uint32_t scratch_rsrc_dword1 =
                S_008F04_BASE_ADDRESS_HI(scratch_va >> 32);

        /* Enable scratch coalescing. */
        scratch_rsrc_dword1 |= S_008F04_SWIZZLE_ENABLE(1);

        for (i = 0 ; i < shader->binary.reloc_count; i++) {
                const struct ac_shader_reloc *reloc =
                                        &shader->binary.relocs[i];
                if (!strcmp(scratch_rsrc_dword0_symbol, reloc->name)) {
                        util_memcpy_cpu_to_le32(shader->binary.code + reloc->offset,
                        &scratch_rsrc_dword0, 4);
                } else if (!strcmp(scratch_rsrc_dword1_symbol, reloc->name)) {
                        util_memcpy_cpu_to_le32(shader->binary.code + reloc->offset,
                        &scratch_rsrc_dword1, 4);
                }
        }
}

/* For the UMR disassembler. */
#define DEBUGGER_END_OF_CODE_MARKER     0xbf9f0000 /* invalid instruction */
#define DEBUGGER_NUM_MARKERS            5

static unsigned si_get_shader_binary_size(const struct si_shader *shader)
{
        unsigned size = shader->binary.code_size;

        if (shader->prolog)
                size += shader->prolog->binary.code_size;
        if (shader->previous_stage)
                size += shader->previous_stage->binary.code_size;
        if (shader->prolog2)
                size += shader->prolog2->binary.code_size;
        if (shader->epilog)
                size += shader->epilog->binary.code_size;
        return size + DEBUGGER_NUM_MARKERS * 4;
}

int si_shader_binary_upload(struct si_screen *sscreen, struct si_shader *shader)
{
        const struct ac_shader_binary *prolog =
                shader->prolog ? &shader->prolog->binary : NULL;
        const struct ac_shader_binary *previous_stage =
                shader->previous_stage ? &shader->previous_stage->binary : NULL;
        const struct ac_shader_binary *prolog2 =
                shader->prolog2 ? &shader->prolog2->binary : NULL;
        const struct ac_shader_binary *epilog =
                shader->epilog ? &shader->epilog->binary : NULL;
        const struct ac_shader_binary *mainb = &shader->binary;
        unsigned bo_size = si_get_shader_binary_size(shader) +
                           (!epilog ? mainb->rodata_size : 0);
        unsigned char *ptr;

        assert(!prolog || !prolog->rodata_size);
        assert(!previous_stage || !previous_stage->rodata_size);
        assert(!prolog2 || !prolog2->rodata_size);
        assert((!prolog && !previous_stage && !prolog2 && !epilog) ||
               !mainb->rodata_size);
        assert(!epilog || !epilog->rodata_size);

        si_resource_reference(&shader->bo, NULL);
        shader->bo = si_aligned_buffer_create(&sscreen->b,
                                              sscreen->cpdma_prefetch_writes_memory ?
                                                0 : SI_RESOURCE_FLAG_READ_ONLY,
                                              PIPE_USAGE_IMMUTABLE,
                                              align(bo_size, SI_CPDMA_ALIGNMENT),
                                              256);
        if (!shader->bo)
                return -ENOMEM;

        /* Upload. */
        ptr = sscreen->ws->buffer_map(shader->bo->buf, NULL,
                                        PIPE_TRANSFER_READ_WRITE |
                                        PIPE_TRANSFER_UNSYNCHRONIZED |
                                        RADEON_TRANSFER_TEMPORARY);

        /* Don't use util_memcpy_cpu_to_le32. LLVM binaries are
         * endian-independent. */
        if (prolog) {
                memcpy(ptr, prolog->code, prolog->code_size);
                ptr += prolog->code_size;
        }
        if (previous_stage) {
                memcpy(ptr, previous_stage->code, previous_stage->code_size);
                ptr += previous_stage->code_size;
        }
        if (prolog2) {
                memcpy(ptr, prolog2->code, prolog2->code_size);
                ptr += prolog2->code_size;
        }

        memcpy(ptr, mainb->code, mainb->code_size);
        ptr += mainb->code_size;

        if (epilog) {
                memcpy(ptr, epilog->code, epilog->code_size);
                ptr += epilog->code_size;
        } else if (mainb->rodata_size > 0) {
                memcpy(ptr, mainb->rodata, mainb->rodata_size);
                ptr += mainb->rodata_size;
        }

        /* Add end-of-code markers for the UMR disassembler. */
        uint32_t *ptr32 = (uint32_t*)ptr;
        for (unsigned i = 0; i < DEBUGGER_NUM_MARKERS; i++)
                ptr32[i] = DEBUGGER_END_OF_CODE_MARKER;

        sscreen->ws->buffer_unmap(shader->bo->buf);
        return 0;
}

static void si_shader_dump_disassembly(const struct ac_shader_binary *binary,
                                       struct pipe_debug_callback *debug,
                                       const char *name, FILE *file)
{
        char *line, *p;
        unsigned i, count;

        if (binary->disasm_string) {
                fprintf(file, "Shader %s disassembly:\n", name);
                fprintf(file, "%s", binary->disasm_string);

                if (debug && debug->debug_message) {
                        /* Very long debug messages are cut off, so send the
                         * disassembly one line at a time. This causes more
                         * overhead, but on the plus side it simplifies
                         * parsing of resulting logs.
                         */
                        pipe_debug_message(debug, SHADER_INFO,
                                           "Shader Disassembly Begin");

                        line = binary->disasm_string;
                        while (*line) {
                                p = util_strchrnul(line, '\n');
                                count = p - line;

                                if (count) {
                                        pipe_debug_message(debug, SHADER_INFO,
                                                           "%.*s", count, line);
                                }

                                if (!*p)
                                        break;
                                line = p + 1;
                        }

                        pipe_debug_message(debug, SHADER_INFO,
                                           "Shader Disassembly End");
                }
        } else {
                fprintf(file, "Shader %s binary:\n", name);
                for (i = 0; i < binary->code_size; i += 4) {
                        fprintf(file, "@0x%x: %02x%02x%02x%02x\n", i,
                                binary->code[i + 3], binary->code[i + 2],
                                binary->code[i + 1], binary->code[i]);
                }
        }
}

static void si_calculate_max_simd_waves(struct si_shader *shader)
{
        struct si_screen *sscreen = shader->selector->screen;
        struct si_shader_config *conf = &shader->config;
        unsigned num_inputs = shader->selector->info.num_inputs;
        unsigned lds_increment = sscreen->info.chip_class >= GFX7 ? 512 : 256;
        unsigned lds_per_wave = 0;
        unsigned max_simd_waves;

        max_simd_waves = ac_get_max_simd_waves(sscreen->info.family);

        /* Compute LDS usage for PS. */
        switch (shader->selector->type) {
        case PIPE_SHADER_FRAGMENT:
                /* The minimum usage per wave is (num_inputs * 48). The maximum
                 * usage is (num_inputs * 48 * 16).
                 * We can get anything in between and it varies between waves.
                 *
                 * The 48 bytes per input for a single primitive is equal to
                 * 4 bytes/component * 4 components/input * 3 points.
                 *
                 * Other stages don't know the size at compile time or don't
                 * allocate LDS per wave, but instead they do it per thread group.
                 */
                lds_per_wave = conf->lds_size * lds_increment +
                               align(num_inputs * 48, lds_increment);
                break;
        case PIPE_SHADER_COMPUTE:
                if (shader->selector) {
                        unsigned max_workgroup_size =
                                si_get_max_workgroup_size(shader);
                        lds_per_wave = (conf->lds_size * lds_increment) /
                                       DIV_ROUND_UP(max_workgroup_size, 64);
                }
                break;
        }

        /* Compute the per-SIMD wave counts. */
        if (conf->num_sgprs) {
                max_simd_waves =
                        MIN2(max_simd_waves,
                             ac_get_num_physical_sgprs(sscreen->info.chip_class) / conf->num_sgprs);
        }

        if (conf->num_vgprs)
                max_simd_waves = MIN2(max_simd_waves, 256 / conf->num_vgprs);

        /* LDS is 64KB per CU (4 SIMDs), which is 16KB per SIMD (usage above
         * 16KB makes some SIMDs unoccupied). */
        if (lds_per_wave)
                max_simd_waves = MIN2(max_simd_waves, 16384 / lds_per_wave);

        conf->max_simd_waves = max_simd_waves;
}

void si_shader_dump_stats_for_shader_db(const struct si_shader *shader,
                                        struct pipe_debug_callback *debug)
{
        const struct si_shader_config *conf = &shader->config;

        pipe_debug_message(debug, SHADER_INFO,
                           "Shader Stats: SGPRS: %d VGPRS: %d Code Size: %d "
                           "LDS: %d Scratch: %d Max Waves: %d Spilled SGPRs: %d "
                           "Spilled VGPRs: %d PrivMem VGPRs: %d",
                           conf->num_sgprs, conf->num_vgprs,
                           si_get_shader_binary_size(shader),
                           conf->lds_size, conf->scratch_bytes_per_wave,
                           conf->max_simd_waves, conf->spilled_sgprs,
                           conf->spilled_vgprs, conf->private_mem_vgprs);
}

static void si_shader_dump_stats(struct si_screen *sscreen,
                                 const struct si_shader *shader,
                                 unsigned processor,
                                 FILE *file,
                                 bool check_debug_option)
{
        const struct si_shader_config *conf = &shader->config;

        if (!check_debug_option ||
            si_can_dump_shader(sscreen, processor)) {
                if (processor == PIPE_SHADER_FRAGMENT) {
                        fprintf(file, "*** SHADER CONFIG ***\n"
                                "SPI_PS_INPUT_ADDR = 0x%04x\n"
                                "SPI_PS_INPUT_ENA  = 0x%04x\n",
                                conf->spi_ps_input_addr, conf->spi_ps_input_ena);
                }

                fprintf(file, "*** SHADER STATS ***\n"
                        "SGPRS: %d\n"
                        "VGPRS: %d\n"
                        "Spilled SGPRs: %d\n"
                        "Spilled VGPRs: %d\n"
                        "Private memory VGPRs: %d\n"
                        "Code Size: %d bytes\n"
                        "LDS: %d blocks\n"
                        "Scratch: %d bytes per wave\n"
                        "Max Waves: %d\n"
                        "********************\n\n\n",
                        conf->num_sgprs, conf->num_vgprs,
                        conf->spilled_sgprs, conf->spilled_vgprs,
                        conf->private_mem_vgprs,
                        si_get_shader_binary_size(shader),
                        conf->lds_size, conf->scratch_bytes_per_wave,
                        conf->max_simd_waves);
        }
}

const char *si_get_shader_name(const struct si_shader *shader, unsigned processor)
{
        switch (processor) {
        case PIPE_SHADER_VERTEX:
                if (shader->key.as_es)
                        return "Vertex Shader as ES";
                else if (shader->key.as_ls)
                        return "Vertex Shader as LS";
                else
                        return "Vertex Shader as VS";
        case PIPE_SHADER_TESS_CTRL:
                return "Tessellation Control Shader";
        case PIPE_SHADER_TESS_EVAL:
                if (shader->key.as_es)
                        return "Tessellation Evaluation Shader as ES";
                else
                        return "Tessellation Evaluation Shader as VS";
        case PIPE_SHADER_GEOMETRY:
                if (shader->is_gs_copy_shader)
                        return "GS Copy Shader as VS";
                else
                        return "Geometry Shader";
        case PIPE_SHADER_FRAGMENT:
                return "Pixel Shader";
        case PIPE_SHADER_COMPUTE:
                return "Compute Shader";
        default:
                return "Unknown Shader";
        }
}

void si_shader_dump(struct si_screen *sscreen, const struct si_shader *shader,
                    struct pipe_debug_callback *debug, unsigned processor,
                    FILE *file, bool check_debug_option)
{
        if (!check_debug_option ||
            si_can_dump_shader(sscreen, processor))
                si_dump_shader_key(processor, shader, file);

        if (!check_debug_option && shader->binary.llvm_ir_string) {
                if (shader->previous_stage &&
                    shader->previous_stage->binary.llvm_ir_string) {
                        fprintf(file, "\n%s - previous stage - LLVM IR:\n\n",
                                si_get_shader_name(shader, processor));
                        fprintf(file, "%s\n", shader->previous_stage->binary.llvm_ir_string);
                }

                fprintf(file, "\n%s - main shader part - LLVM IR:\n\n",
                        si_get_shader_name(shader, processor));
                fprintf(file, "%s\n", shader->binary.llvm_ir_string);
        }

        if (!check_debug_option ||
            (si_can_dump_shader(sscreen, processor) &&
             !(sscreen->debug_flags & DBG(NO_ASM)))) {
                fprintf(file, "\n%s:\n", si_get_shader_name(shader, processor));

                if (shader->prolog)
                        si_shader_dump_disassembly(&shader->prolog->binary,
                                                   debug, "prolog", file);
                if (shader->previous_stage)
                        si_shader_dump_disassembly(&shader->previous_stage->binary,
                                                   debug, "previous stage", file);
                if (shader->prolog2)
                        si_shader_dump_disassembly(&shader->prolog2->binary,
                                                   debug, "prolog2", file);

                si_shader_dump_disassembly(&shader->binary, debug, "main", file);

                if (shader->epilog)
                        si_shader_dump_disassembly(&shader->epilog->binary,
                                                   debug, "epilog", file);
                fprintf(file, "\n");
        }

        si_shader_dump_stats(sscreen, shader, processor, file,
                             check_debug_option);
}

static int si_compile_llvm(struct si_screen *sscreen,
                           struct ac_shader_binary *binary,
                           struct si_shader_config *conf,
                           struct ac_llvm_compiler *compiler,
                           LLVMModuleRef mod,
                           struct pipe_debug_callback *debug,
                           unsigned processor,
                           const char *name,
                           bool less_optimized)
{
        int r = 0;
        unsigned count = p_atomic_inc_return(&sscreen->num_compilations);

        if (si_can_dump_shader(sscreen, processor)) {
                fprintf(stderr, "radeonsi: Compiling shader %d\n", count);

                if (!(sscreen->debug_flags & (DBG(NO_IR) | DBG(PREOPT_IR)))) {
                        fprintf(stderr, "%s LLVM IR:\n\n", name);
                        ac_dump_module(mod);
                        fprintf(stderr, "\n");
                }
        }

        if (sscreen->record_llvm_ir) {
                char *ir = LLVMPrintModuleToString(mod);
                binary->llvm_ir_string = strdup(ir);
                LLVMDisposeMessage(ir);
        }

        if (!si_replace_shader(count, binary)) {
                r = si_llvm_compile(mod, binary, compiler, debug,
                                    less_optimized);
                if (r)
                        return r;
        }

        si_shader_binary_read_config(binary, conf, 0);

        /* Enable 64-bit and 16-bit denormals, because there is no performance
         * cost.
         *
         * If denormals are enabled, all floating-point output modifiers are
         * ignored.
         *
         * Don't enable denormals for 32-bit floats, because:
         * - Floating-point output modifiers would be ignored by the hw.
         * - Some opcodes don't support denormals, such as v_mad_f32. We would
         *   have to stop using those.
         * - GFX6 & GFX7 would be very slow.
         */
        conf->float_mode |= V_00B028_FP_64_DENORMS;

        FREE(binary->config);
        FREE(binary->global_symbol_offsets);
        binary->config = NULL;
        binary->global_symbol_offsets = NULL;

        /* Some shaders can't have rodata because their binaries can be
         * concatenated.
         */
        if (binary->rodata_size &&
            (processor == PIPE_SHADER_VERTEX ||
             processor == PIPE_SHADER_TESS_CTRL ||
             processor == PIPE_SHADER_TESS_EVAL ||
             processor == PIPE_SHADER_FRAGMENT)) {
                fprintf(stderr, "radeonsi: The shader can't have rodata.");
                return -EINVAL;
        }

        return r;
}

static void si_llvm_build_ret(struct si_shader_context *ctx, LLVMValueRef ret)
{
        if (LLVMGetTypeKind(LLVMTypeOf(ret)) == LLVMVoidTypeKind)
                LLVMBuildRetVoid(ctx->ac.builder);
        else
                LLVMBuildRet(ctx->ac.builder, ret);
}

/* Generate code for the hardware VS shader stage to go with a geometry shader */
struct si_shader *
si_generate_gs_copy_shader(struct si_screen *sscreen,
                           struct ac_llvm_compiler *compiler,
                           struct si_shader_selector *gs_selector,
                           struct pipe_debug_callback *debug)
{
        struct si_shader_context ctx;
        struct si_shader *shader;
        LLVMBuilderRef builder;
        struct si_shader_output_values outputs[SI_MAX_VS_OUTPUTS];
        struct tgsi_shader_info *gsinfo = &gs_selector->info;
        int i, r;


        shader = CALLOC_STRUCT(si_shader);
        if (!shader)
                return NULL;

        /* We can leave the fence as permanently signaled because the GS copy
         * shader only becomes visible globally after it has been compiled. */
        util_queue_fence_init(&shader->ready);

        shader->selector = gs_selector;
        shader->is_gs_copy_shader = true;

        si_init_shader_ctx(&ctx, sscreen, compiler);
        ctx.shader = shader;
        ctx.type = PIPE_SHADER_VERTEX;

        builder = ctx.ac.builder;

        create_function(&ctx);
        preload_ring_buffers(&ctx);

        LLVMValueRef voffset =
                LLVMBuildMul(ctx.ac.builder, ctx.abi.vertex_id,
                             LLVMConstInt(ctx.i32, 4, 0), "");

        /* Fetch the vertex stream ID.*/
        LLVMValueRef stream_id;

        if (gs_selector->so.num_outputs)
                stream_id = si_unpack_param(&ctx, ctx.param_streamout_config, 24, 2);
        else
                stream_id = ctx.i32_0;

        /* Fill in output information. */
        for (i = 0; i < gsinfo->num_outputs; ++i) {
                outputs[i].semantic_name = gsinfo->output_semantic_name[i];
                outputs[i].semantic_index = gsinfo->output_semantic_index[i];

                for (int chan = 0; chan < 4; chan++) {
                        outputs[i].vertex_stream[chan] =
                                (gsinfo->output_streams[i] >> (2 * chan)) & 3;
                }
        }

        LLVMBasicBlockRef end_bb;
        LLVMValueRef switch_inst;

        end_bb = LLVMAppendBasicBlockInContext(ctx.ac.context, ctx.main_fn, "end");
        switch_inst = LLVMBuildSwitch(builder, stream_id, end_bb, 4);

        for (int stream = 0; stream < 4; stream++) {
                LLVMBasicBlockRef bb;
                unsigned offset;

                if (!gsinfo->num_stream_output_components[stream])
                        continue;

                if (stream > 0 && !gs_selector->so.num_outputs)
                        continue;

                bb = LLVMInsertBasicBlockInContext(ctx.ac.context, end_bb, "out");
                LLVMAddCase(switch_inst, LLVMConstInt(ctx.i32, stream, 0), bb);
                LLVMPositionBuilderAtEnd(builder, bb);

                /* Fetch vertex data from GSVS ring */
                offset = 0;
                for (i = 0; i < gsinfo->num_outputs; ++i) {
                        for (unsigned chan = 0; chan < 4; chan++) {
                                if (!(gsinfo->output_usagemask[i] & (1 << chan)) ||
                                    outputs[i].vertex_stream[chan] != stream) {
                                        outputs[i].values[chan] = LLVMGetUndef(ctx.f32);
                                        continue;
                                }

                                LLVMValueRef soffset = LLVMConstInt(ctx.i32,
                                        offset * gs_selector->gs_max_out_vertices * 16 * 4, 0);
                                offset++;

                                outputs[i].values[chan] =
                                        ac_build_buffer_load(&ctx.ac,
                                                             ctx.gsvs_ring[0], 1,
                                                             ctx.i32_0, voffset,
                                                             soffset, 0, 1, 1,
                                                             true, false);
                        }
                }

                /* Streamout and exports. */
                if (gs_selector->so.num_outputs) {
                        si_llvm_emit_streamout(&ctx, outputs,
                                               gsinfo->num_outputs,
                                               stream);
                }

                if (stream == 0) {
                        /* Vertex color clamping.
                         *
                         * This uses a state constant loaded in a user data SGPR and
                         * an IF statement is added that clamps all colors if the constant
                         * is true.
                         */
                        struct lp_build_if_state if_ctx;
                        LLVMValueRef v[2], cond = NULL;
                        LLVMBasicBlockRef blocks[2];

                        for (unsigned i = 0; i < gsinfo->num_outputs; i++) {
                                if (gsinfo->output_semantic_name[i] != TGSI_SEMANTIC_COLOR &&
                                    gsinfo->output_semantic_name[i] != TGSI_SEMANTIC_BCOLOR)
                                        continue;

                                /* We've found a color. */
                                if (!cond) {
                                        /* The state is in the first bit of the user SGPR. */
                                        cond = LLVMGetParam(ctx.main_fn,
                                                            ctx.param_vs_state_bits);
                                        cond = LLVMBuildTrunc(ctx.ac.builder, cond,
                                                              ctx.i1, "");
                                        lp_build_if(&if_ctx, &ctx.gallivm, cond);
                                        /* Remember blocks for Phi. */
                                        blocks[0] = if_ctx.true_block;
                                        blocks[1] = if_ctx.entry_block;
                                }

                                for (unsigned j = 0; j < 4; j++) {
                                        /* Insert clamp into the true block. */
                                        v[0] = ac_build_clamp(&ctx.ac, outputs[i].values[j]);
                                        v[1] = outputs[i].values[j];

                                        /* Insert Phi into the endif block. */
                                        LLVMPositionBuilderAtEnd(ctx.ac.builder, if_ctx.merge_block);
                                        outputs[i].values[j] = ac_build_phi(&ctx.ac, ctx.f32, 2, v, blocks);
                                        LLVMPositionBuilderAtEnd(ctx.ac.builder, if_ctx.true_block);
                                }
                        }
                        if (cond)
                                lp_build_endif(&if_ctx);

                        si_llvm_export_vs(&ctx, outputs, gsinfo->num_outputs);
                }

                LLVMBuildBr(builder, end_bb);
        }

        LLVMPositionBuilderAtEnd(builder, end_bb);

        LLVMBuildRetVoid(ctx.ac.builder);

        ctx.type = PIPE_SHADER_GEOMETRY; /* override for shader dumping */
        si_llvm_optimize_module(&ctx);

        r = si_compile_llvm(sscreen, &ctx.shader->binary,
                            &ctx.shader->config, ctx.compiler,
                            ctx.ac.module,
                            debug, PIPE_SHADER_GEOMETRY,
                            "GS Copy Shader", false);
        if (!r) {
                if (si_can_dump_shader(sscreen, PIPE_SHADER_GEOMETRY))
                        fprintf(stderr, "GS Copy Shader:\n");
                si_shader_dump(sscreen, ctx.shader, debug,
                               PIPE_SHADER_GEOMETRY, stderr, true);
                r = si_shader_binary_upload(sscreen, ctx.shader);
        }

        si_llvm_dispose(&ctx);

        if (r != 0) {
                FREE(shader);
                shader = NULL;
        } else {
                si_fix_resource_usage(sscreen, shader);
        }
        return shader;
}

static void si_dump_shader_key_vs(const struct si_shader_key *key,
                                  const struct si_vs_prolog_bits *prolog,
                                  const char *prefix, FILE *f)
{
        fprintf(f, "  %s.instance_divisor_is_one = %u\n",
                prefix, prolog->instance_divisor_is_one);
        fprintf(f, "  %s.instance_divisor_is_fetched = %u\n",
                prefix, prolog->instance_divisor_is_fetched);
        fprintf(f, "  %s.unpack_instance_id_from_vertex_id = %u\n",
                prefix, prolog->unpack_instance_id_from_vertex_id);
        fprintf(f, "  %s.ls_vgpr_fix = %u\n",
                prefix, prolog->ls_vgpr_fix);

        fprintf(f, "  mono.vs.fetch_opencode = %x\n", key->mono.vs_fetch_opencode);
        fprintf(f, "  mono.vs.fix_fetch = {");
        for (int i = 0; i < SI_MAX_ATTRIBS; i++) {
                union si_vs_fix_fetch fix = key->mono.vs_fix_fetch[i];
                if (i)
                        fprintf(f, ", ");
                if (!fix.bits)
                        fprintf(f, "0");
                else
                        fprintf(f, "%u.%u.%u.%u", fix.u.reverse, fix.u.log_size,
                                fix.u.num_channels_m1, fix.u.format);
        }
        fprintf(f, "}\n");
}

static void si_dump_shader_key(unsigned processor, const struct si_shader *shader,
                               FILE *f)
{
        const struct si_shader_key *key = &shader->key;

        fprintf(f, "SHADER KEY\n");

        switch (processor) {
        case PIPE_SHADER_VERTEX:
                si_dump_shader_key_vs(key, &key->part.vs.prolog,
                                      "part.vs.prolog", f);
                fprintf(f, "  as_es = %u\n", key->as_es);
                fprintf(f, "  as_ls = %u\n", key->as_ls);
                fprintf(f, "  mono.u.vs_export_prim_id = %u\n",
                        key->mono.u.vs_export_prim_id);
                break;

        case PIPE_SHADER_TESS_CTRL:
                if (shader->selector->screen->info.chip_class >= GFX9) {
                        si_dump_shader_key_vs(key, &key->part.tcs.ls_prolog,
                                              "part.tcs.ls_prolog", f);
                }
                fprintf(f, "  part.tcs.epilog.prim_mode = %u\n", key->part.tcs.epilog.prim_mode);
                fprintf(f, "  mono.u.ff_tcs_inputs_to_copy = 0x%"PRIx64"\n", key->mono.u.ff_tcs_inputs_to_copy);
                break;

        case PIPE_SHADER_TESS_EVAL:
                fprintf(f, "  as_es = %u\n", key->as_es);
                fprintf(f, "  mono.u.vs_export_prim_id = %u\n",
                        key->mono.u.vs_export_prim_id);
                break;

        case PIPE_SHADER_GEOMETRY:
                if (shader->is_gs_copy_shader)
                        break;

                if (shader->selector->screen->info.chip_class >= GFX9 &&
                    key->part.gs.es->type == PIPE_SHADER_VERTEX) {
                        si_dump_shader_key_vs(key, &key->part.gs.vs_prolog,
                                              "part.gs.vs_prolog", f);
                }
                fprintf(f, "  part.gs.prolog.tri_strip_adj_fix = %u\n", key->part.gs.prolog.tri_strip_adj_fix);
                break;

        case PIPE_SHADER_COMPUTE:
                break;

        case PIPE_SHADER_FRAGMENT:
                fprintf(f, "  part.ps.prolog.color_two_side = %u\n", key->part.ps.prolog.color_two_side);
                fprintf(f, "  part.ps.prolog.flatshade_colors = %u\n", key->part.ps.prolog.flatshade_colors);
                fprintf(f, "  part.ps.prolog.poly_stipple = %u\n", key->part.ps.prolog.poly_stipple);
                fprintf(f, "  part.ps.prolog.force_persp_sample_interp = %u\n", key->part.ps.prolog.force_persp_sample_interp);
                fprintf(f, "  part.ps.prolog.force_linear_sample_interp = %u\n", key->part.ps.prolog.force_linear_sample_interp);
                fprintf(f, "  part.ps.prolog.force_persp_center_interp = %u\n", key->part.ps.prolog.force_persp_center_interp);
                fprintf(f, "  part.ps.prolog.force_linear_center_interp = %u\n", key->part.ps.prolog.force_linear_center_interp);
                fprintf(f, "  part.ps.prolog.bc_optimize_for_persp = %u\n", key->part.ps.prolog.bc_optimize_for_persp);
                fprintf(f, "  part.ps.prolog.bc_optimize_for_linear = %u\n", key->part.ps.prolog.bc_optimize_for_linear);
                fprintf(f, "  part.ps.epilog.spi_shader_col_format = 0x%x\n", key->part.ps.epilog.spi_shader_col_format);
                fprintf(f, "  part.ps.epilog.color_is_int8 = 0x%X\n", key->part.ps.epilog.color_is_int8);
                fprintf(f, "  part.ps.epilog.color_is_int10 = 0x%X\n", key->part.ps.epilog.color_is_int10);
                fprintf(f, "  part.ps.epilog.last_cbuf = %u\n", key->part.ps.epilog.last_cbuf);
                fprintf(f, "  part.ps.epilog.alpha_func = %u\n", key->part.ps.epilog.alpha_func);
                fprintf(f, "  part.ps.epilog.alpha_to_one = %u\n", key->part.ps.epilog.alpha_to_one);
                fprintf(f, "  part.ps.epilog.poly_line_smoothing = %u\n", key->part.ps.epilog.poly_line_smoothing);
                fprintf(f, "  part.ps.epilog.clamp_color = %u\n", key->part.ps.epilog.clamp_color);
                break;

        default:
                assert(0);
        }

        if ((processor == PIPE_SHADER_GEOMETRY ||
             processor == PIPE_SHADER_TESS_EVAL ||
             processor == PIPE_SHADER_VERTEX) &&
            !key->as_es && !key->as_ls) {
                fprintf(f, "  opt.kill_outputs = 0x%"PRIx64"\n", key->opt.kill_outputs);
                fprintf(f, "  opt.clip_disable = %u\n", key->opt.clip_disable);
        }
}

static void si_init_shader_ctx(struct si_shader_context *ctx,
                               struct si_screen *sscreen,
                               struct ac_llvm_compiler *compiler)
{
        struct lp_build_tgsi_context *bld_base;

        si_llvm_context_init(ctx, sscreen, compiler);

        bld_base = &ctx->bld_base;
        bld_base->emit_fetch_funcs[TGSI_FILE_CONSTANT] = fetch_constant;

        bld_base->op_actions[TGSI_OPCODE_INTERP_CENTROID].emit = build_interp_intrinsic;
        bld_base->op_actions[TGSI_OPCODE_INTERP_SAMPLE].emit = build_interp_intrinsic;
        bld_base->op_actions[TGSI_OPCODE_INTERP_OFFSET].emit = build_interp_intrinsic;

        bld_base->op_actions[TGSI_OPCODE_MEMBAR].emit = membar_emit;

        bld_base->op_actions[TGSI_OPCODE_CLOCK].emit = clock_emit;

        bld_base->op_actions[TGSI_OPCODE_DDX].emit = si_llvm_emit_ddxy;
        bld_base->op_actions[TGSI_OPCODE_DDY].emit = si_llvm_emit_ddxy;
        bld_base->op_actions[TGSI_OPCODE_DDX_FINE].emit = si_llvm_emit_ddxy;
        bld_base->op_actions[TGSI_OPCODE_DDY_FINE].emit = si_llvm_emit_ddxy;

        bld_base->op_actions[TGSI_OPCODE_VOTE_ALL].emit = vote_all_emit;
        bld_base->op_actions[TGSI_OPCODE_VOTE_ANY].emit = vote_any_emit;
        bld_base->op_actions[TGSI_OPCODE_VOTE_EQ].emit = vote_eq_emit;
        bld_base->op_actions[TGSI_OPCODE_BALLOT].emit = ballot_emit;
        bld_base->op_actions[TGSI_OPCODE_READ_FIRST].intr_name = "llvm.amdgcn.readfirstlane";
        bld_base->op_actions[TGSI_OPCODE_READ_FIRST].emit = read_lane_emit;
        bld_base->op_actions[TGSI_OPCODE_READ_INVOC].intr_name = "llvm.amdgcn.readlane";
        bld_base->op_actions[TGSI_OPCODE_READ_INVOC].emit = read_lane_emit;

        bld_base->op_actions[TGSI_OPCODE_EMIT].emit = si_tgsi_emit_vertex;
        bld_base->op_actions[TGSI_OPCODE_ENDPRIM].emit = si_tgsi_emit_primitive;
        bld_base->op_actions[TGSI_OPCODE_BARRIER].emit = si_llvm_emit_barrier;
}

static void si_optimize_vs_outputs(struct si_shader_context *ctx)
{
        struct si_shader *shader = ctx->shader;
        struct tgsi_shader_info *info = &shader->selector->info;

        if ((ctx->type != PIPE_SHADER_VERTEX &&
             ctx->type != PIPE_SHADER_TESS_EVAL) ||
            shader->key.as_ls ||
            shader->key.as_es)
                return;

        ac_optimize_vs_outputs(&ctx->ac,
                               ctx->main_fn,
                               shader->info.vs_output_param_offset,
                               info->num_outputs,
                               &shader->info.nr_param_exports);
}

static void si_init_exec_from_input(struct si_shader_context *ctx,
                                    unsigned param, unsigned bitoffset)
{
        LLVMValueRef args[] = {
                LLVMGetParam(ctx->main_fn, param),
                LLVMConstInt(ctx->i32, bitoffset, 0),
        };
        ac_build_intrinsic(&ctx->ac,
                           "llvm.amdgcn.init.exec.from.input",
                           ctx->voidt, args, 2, AC_FUNC_ATTR_CONVERGENT);
}

static bool si_vs_needs_prolog(const struct si_shader_selector *sel,
                               const struct si_vs_prolog_bits *key)
{
        /* VGPR initialization fixup for Vega10 and Raven is always done in the
         * VS prolog. */
        return sel->vs_needs_prolog || key->ls_vgpr_fix;
}

static bool si_compile_tgsi_main(struct si_shader_context *ctx)
{
        struct si_shader *shader = ctx->shader;
        struct si_shader_selector *sel = shader->selector;
        struct lp_build_tgsi_context *bld_base = &ctx->bld_base;

        // TODO clean all this up!
        switch (ctx->type) {
        case PIPE_SHADER_VERTEX:
                ctx->load_input = declare_input_vs;
                if (shader->key.as_ls)
                        ctx->abi.emit_outputs = si_llvm_emit_ls_epilogue;
                else if (shader->key.as_es)
                        ctx->abi.emit_outputs = si_llvm_emit_es_epilogue;
                else
                        ctx->abi.emit_outputs = si_llvm_emit_vs_epilogue;
                bld_base->emit_epilogue = si_tgsi_emit_epilogue;
                ctx->abi.load_base_vertex = get_base_vertex;
                break;
        case PIPE_SHADER_TESS_CTRL:
                bld_base->emit_fetch_funcs[TGSI_FILE_INPUT] = fetch_input_tcs;
                ctx->abi.load_tess_varyings = si_nir_load_tcs_varyings;
                bld_base->emit_fetch_funcs[TGSI_FILE_OUTPUT] = fetch_output_tcs;
                bld_base->emit_store = store_output_tcs;
                ctx->abi.store_tcs_outputs = si_nir_store_output_tcs;
                ctx->abi.emit_outputs = si_llvm_emit_tcs_epilogue;
                ctx->abi.load_patch_vertices_in = si_load_patch_vertices_in;
                bld_base->emit_epilogue = si_tgsi_emit_epilogue;
                break;
        case PIPE_SHADER_TESS_EVAL:
                bld_base->emit_fetch_funcs[TGSI_FILE_INPUT] = fetch_input_tes;
                ctx->abi.load_tess_varyings = si_nir_load_input_tes;
                ctx->abi.load_tess_coord = si_load_tess_coord;
                ctx->abi.load_tess_level = si_load_tess_level;
                ctx->abi.load_patch_vertices_in = si_load_patch_vertices_in;
                if (shader->key.as_es)
                        ctx->abi.emit_outputs = si_llvm_emit_es_epilogue;
                else
                        ctx->abi.emit_outputs = si_llvm_emit_vs_epilogue;
                bld_base->emit_epilogue = si_tgsi_emit_epilogue;
                break;
        case PIPE_SHADER_GEOMETRY:
                bld_base->emit_fetch_funcs[TGSI_FILE_INPUT] = fetch_input_gs;
                ctx->abi.load_inputs = si_nir_load_input_gs;
                ctx->abi.emit_vertex = si_llvm_emit_vertex;
                ctx->abi.emit_primitive = si_llvm_emit_primitive;
                ctx->abi.emit_outputs = si_llvm_emit_gs_epilogue;
                bld_base->emit_epilogue = si_tgsi_emit_gs_epilogue;
                break;
        case PIPE_SHADER_FRAGMENT:
                ctx->load_input = declare_input_fs;
                ctx->abi.emit_outputs = si_llvm_return_fs_outputs;
                bld_base->emit_epilogue = si_tgsi_emit_epilogue;
                ctx->abi.lookup_interp_param = si_nir_lookup_interp_param;
                ctx->abi.load_sample_position = load_sample_position;
                ctx->abi.load_sample_mask_in = load_sample_mask_in;
                ctx->abi.emit_kill = si_llvm_emit_kill;
                break;
        case PIPE_SHADER_COMPUTE:
                ctx->abi.load_local_group_size = get_block_size;
                break;
        default:
                assert(!"Unsupported shader type");
                return false;
        }

        ctx->abi.load_ubo = load_ubo;
        ctx->abi.load_ssbo = load_ssbo;

        create_function(ctx);
        preload_ring_buffers(ctx);

        /* For GFX9 merged shaders:
         * - Set EXEC for the first shader. If the prolog is present, set
         *   EXEC there instead.
         * - Add a barrier before the second shader.
         * - In the second shader, reset EXEC to ~0 and wrap the main part in
         *   an if-statement. This is required for correctness in geometry
         *   shaders, to ensure that empty GS waves do not send GS_EMIT and
         *   GS_CUT messages.
         *
         * For monolithic merged shaders, the first shader is wrapped in an
         * if-block together with its prolog in si_build_wrapper_function.
         */
        if (ctx->screen->info.chip_class >= GFX9) {
                if (!shader->is_monolithic &&
                    sel->info.num_instructions > 1 && /* not empty shader */
                    (shader->key.as_es || shader->key.as_ls) &&
                    (ctx->type == PIPE_SHADER_TESS_EVAL ||
                     (ctx->type == PIPE_SHADER_VERTEX &&
                      !si_vs_needs_prolog(sel, &shader->key.part.vs.prolog)))) {
                        si_init_exec_from_input(ctx,
                                                ctx->param_merged_wave_info, 0);
                } else if (ctx->type == PIPE_SHADER_TESS_CTRL ||
                           ctx->type == PIPE_SHADER_GEOMETRY) {
                        if (!shader->is_monolithic)
                                ac_init_exec_full_mask(&ctx->ac);

                        LLVMValueRef num_threads = si_unpack_param(ctx, ctx->param_merged_wave_info, 8, 8);
                        LLVMValueRef ena =
                                LLVMBuildICmp(ctx->ac.builder, LLVMIntULT,
                                            ac_get_thread_id(&ctx->ac), num_threads, "");
                        lp_build_if(&ctx->merged_wrap_if_state, &ctx->gallivm, ena);

                        /* The barrier must execute for all shaders in a
                         * threadgroup.
                         *
                         * Execute the barrier inside the conditional block,
                         * so that empty waves can jump directly to s_endpgm,
                         * which will also signal the barrier.
                         *
                         * If the shader is TCS and the TCS epilog is present
                         * and contains a barrier, it will wait there and then
                         * reach s_endpgm.
                         */
                        si_llvm_emit_barrier(NULL, bld_base, NULL);
                }
        }

        if (ctx->type == PIPE_SHADER_TESS_CTRL &&
            sel->tcs_info.tessfactors_are_def_in_all_invocs) {
                for (unsigned i = 0; i < 6; i++) {
                        ctx->invoc0_tess_factors[i] =
                                ac_build_alloca_undef(&ctx->ac, ctx->i32, "");
                }
        }

        if (ctx->type == PIPE_SHADER_GEOMETRY) {
                int i;
                for (i = 0; i < 4; i++) {
                        ctx->gs_next_vertex[i] =
                                ac_build_alloca(&ctx->ac, ctx->i32, "");
                }
        }

        if (sel->force_correct_derivs_after_kill) {
                ctx->postponed_kill = ac_build_alloca_undef(&ctx->ac, ctx->i1, "");
                /* true = don't kill. */
                LLVMBuildStore(ctx->ac.builder, ctx->i1true,
                               ctx->postponed_kill);
        }

        if (sel->tokens) {
                if (!lp_build_tgsi_llvm(bld_base, sel->tokens)) {
                        fprintf(stderr, "Failed to translate shader from TGSI to LLVM\n");
                        return false;
                }
        } else {
                if (!si_nir_build_llvm(ctx, sel->nir)) {
                        fprintf(stderr, "Failed to translate shader from NIR to LLVM\n");
                        return false;
                }
        }

        si_llvm_build_ret(ctx, ctx->return_value);
        return true;
}

/**
 * Compute the VS prolog key, which contains all the information needed to
 * build the VS prolog function, and set shader->info bits where needed.
 *
 * \param info             Shader info of the vertex shader.
 * \param num_input_sgprs  Number of input SGPRs for the vertex shader.
 * \param prolog_key       Key of the VS prolog
 * \param shader_out       The vertex shader, or the next shader if merging LS+HS or ES+GS.
 * \param key              Output shader part key.
 */
static void si_get_vs_prolog_key(const struct tgsi_shader_info *info,
                                 unsigned num_input_sgprs,
                                 const struct si_vs_prolog_bits *prolog_key,
                                 struct si_shader *shader_out,
                                 union si_shader_part_key *key)
{
        memset(key, 0, sizeof(*key));
        key->vs_prolog.states = *prolog_key;
        key->vs_prolog.num_input_sgprs = num_input_sgprs;
        key->vs_prolog.last_input = MAX2(1, info->num_inputs) - 1;
        key->vs_prolog.as_ls = shader_out->key.as_ls;
        key->vs_prolog.as_es = shader_out->key.as_es;

        if (shader_out->selector->type == PIPE_SHADER_TESS_CTRL) {
                key->vs_prolog.as_ls = 1;
                key->vs_prolog.num_merged_next_stage_vgprs = 2;
        } else if (shader_out->selector->type == PIPE_SHADER_GEOMETRY) {
                key->vs_prolog.as_es = 1;
                key->vs_prolog.num_merged_next_stage_vgprs = 5;
        }

        /* Enable loading the InstanceID VGPR. */
        uint16_t input_mask = u_bit_consecutive(0, info->num_inputs);

        if ((key->vs_prolog.states.instance_divisor_is_one |
             key->vs_prolog.states.instance_divisor_is_fetched) & input_mask)
                shader_out->info.uses_instanceid = true;
}

/**
 * Compute the PS prolog key, which contains all the information needed to
 * build the PS prolog function, and set related bits in shader->config.
 */
static void si_get_ps_prolog_key(struct si_shader *shader,
                                 union si_shader_part_key *key,
                                 bool separate_prolog)
{
        struct tgsi_shader_info *info = &shader->selector->info;

        memset(key, 0, sizeof(*key));
        key->ps_prolog.states = shader->key.part.ps.prolog;
        key->ps_prolog.colors_read = info->colors_read;
        key->ps_prolog.num_input_sgprs = shader->info.num_input_sgprs;
        key->ps_prolog.num_input_vgprs = shader->info.num_input_vgprs;
        key->ps_prolog.wqm = info->uses_derivatives &&
                (key->ps_prolog.colors_read ||
                 key->ps_prolog.states.force_persp_sample_interp ||
                 key->ps_prolog.states.force_linear_sample_interp ||
                 key->ps_prolog.states.force_persp_center_interp ||
                 key->ps_prolog.states.force_linear_center_interp ||
                 key->ps_prolog.states.bc_optimize_for_persp ||
                 key->ps_prolog.states.bc_optimize_for_linear);
        key->ps_prolog.ancillary_vgpr_index = shader->info.ancillary_vgpr_index;

        if (info->colors_read) {
                unsigned *color = shader->selector->color_attr_index;

                if (shader->key.part.ps.prolog.color_two_side) {
                        /* BCOLORs are stored after the last input. */
                        key->ps_prolog.num_interp_inputs = info->num_inputs;
                        key->ps_prolog.face_vgpr_index = shader->info.face_vgpr_index;
                        shader->config.spi_ps_input_ena |= S_0286CC_FRONT_FACE_ENA(1);
                }

                for (unsigned i = 0; i < 2; i++) {
                        unsigned interp = info->input_interpolate[color[i]];
                        unsigned location = info->input_interpolate_loc[color[i]];

                        if (!(info->colors_read & (0xf << i*4)))
                                continue;

                        key->ps_prolog.color_attr_index[i] = color[i];

                        if (shader->key.part.ps.prolog.flatshade_colors &&
                            interp == TGSI_INTERPOLATE_COLOR)
                                interp = TGSI_INTERPOLATE_CONSTANT;

                        switch (interp) {
                        case TGSI_INTERPOLATE_CONSTANT:
                                key->ps_prolog.color_interp_vgpr_index[i] = -1;
                                break;
                        case TGSI_INTERPOLATE_PERSPECTIVE:
                        case TGSI_INTERPOLATE_COLOR:
                                /* Force the interpolation location for colors here. */
                                if (shader->key.part.ps.prolog.force_persp_sample_interp)
                                        location = TGSI_INTERPOLATE_LOC_SAMPLE;
                                if (shader->key.part.ps.prolog.force_persp_center_interp)
                                        location = TGSI_INTERPOLATE_LOC_CENTER;

                                switch (location) {
                                case TGSI_INTERPOLATE_LOC_SAMPLE:
                                        key->ps_prolog.color_interp_vgpr_index[i] = 0;
                                        shader->config.spi_ps_input_ena |=
                                                S_0286CC_PERSP_SAMPLE_ENA(1);
                                        break;
                                case TGSI_INTERPOLATE_LOC_CENTER:
                                        key->ps_prolog.color_interp_vgpr_index[i] = 2;
                                        shader->config.spi_ps_input_ena |=
                                                S_0286CC_PERSP_CENTER_ENA(1);
                                        break;
                                case TGSI_INTERPOLATE_LOC_CENTROID:
                                        key->ps_prolog.color_interp_vgpr_index[i] = 4;
                                        shader->config.spi_ps_input_ena |=
                                                S_0286CC_PERSP_CENTROID_ENA(1);
                                        break;
                                default:
                                        assert(0);
                                }
                                break;
                        case TGSI_INTERPOLATE_LINEAR:
                                /* Force the interpolation location for colors here. */
                                if (shader->key.part.ps.prolog.force_linear_sample_interp)
                                        location = TGSI_INTERPOLATE_LOC_SAMPLE;
                                if (shader->key.part.ps.prolog.force_linear_center_interp)
                                        location = TGSI_INTERPOLATE_LOC_CENTER;

                                /* The VGPR assignment for non-monolithic shaders
                                 * works because InitialPSInputAddr is set on the
                                 * main shader and PERSP_PULL_MODEL is never used.
                                 */
                                switch (location) {
                                case TGSI_INTERPOLATE_LOC_SAMPLE:
                                        key->ps_prolog.color_interp_vgpr_index[i] =
                                                separate_prolog ? 6 : 9;
                                        shader->config.spi_ps_input_ena |=
                                                S_0286CC_LINEAR_SAMPLE_ENA(1);
                                        break;
                                case TGSI_INTERPOLATE_LOC_CENTER:
                                        key->ps_prolog.color_interp_vgpr_index[i] =
                                                separate_prolog ? 8 : 11;
                                        shader->config.spi_ps_input_ena |=
                                                S_0286CC_LINEAR_CENTER_ENA(1);
                                        break;
                                case TGSI_INTERPOLATE_LOC_CENTROID:
                                        key->ps_prolog.color_interp_vgpr_index[i] =
                                                separate_prolog ? 10 : 13;
                                        shader->config.spi_ps_input_ena |=
                                                S_0286CC_LINEAR_CENTROID_ENA(1);
                                        break;
                                default:
                                        assert(0);
                                }
                                break;
                        default:
                                assert(0);
                        }
                }
        }
}

/**
 * Check whether a PS prolog is required based on the key.
 */
static bool si_need_ps_prolog(const union si_shader_part_key *key)
{
        return key->ps_prolog.colors_read ||
               key->ps_prolog.states.force_persp_sample_interp ||
               key->ps_prolog.states.force_linear_sample_interp ||
               key->ps_prolog.states.force_persp_center_interp ||
               key->ps_prolog.states.force_linear_center_interp ||
               key->ps_prolog.states.bc_optimize_for_persp ||
               key->ps_prolog.states.bc_optimize_for_linear ||
               key->ps_prolog.states.poly_stipple ||
               key->ps_prolog.states.samplemask_log_ps_iter;
}

/**
 * Compute the PS epilog key, which contains all the information needed to
 * build the PS epilog function.
 */
static void si_get_ps_epilog_key(struct si_shader *shader,
                                 union si_shader_part_key *key)
{
        struct tgsi_shader_info *info = &shader->selector->info;
        memset(key, 0, sizeof(*key));
        key->ps_epilog.colors_written = info->colors_written;
        key->ps_epilog.writes_z = info->writes_z;
        key->ps_epilog.writes_stencil = info->writes_stencil;
        key->ps_epilog.writes_samplemask = info->writes_samplemask;
        key->ps_epilog.states = shader->key.part.ps.epilog;
}

/**
 * Build the GS prolog function. Rotate the input vertices for triangle strips
 * with adjacency.
 */
static void si_build_gs_prolog_function(struct si_shader_context *ctx,
                                        union si_shader_part_key *key)
{
        unsigned num_sgprs, num_vgprs;
        struct si_function_info fninfo;
        LLVMBuilderRef builder = ctx->ac.builder;
        LLVMTypeRef returns[48];
        LLVMValueRef func, ret;

        si_init_function_info(&fninfo);

        if (ctx->screen->info.chip_class >= GFX9) {
                if (key->gs_prolog.states.gfx9_prev_is_vs)
                        num_sgprs = 8 + GFX9_VSGS_NUM_USER_SGPR;
                else
                        num_sgprs = 8 + GFX9_TESGS_NUM_USER_SGPR;
                num_vgprs = 5; /* ES inputs are not needed by GS */
        } else {
                num_sgprs = GFX6_GS_NUM_USER_SGPR + 2;
                num_vgprs = 8;
        }

        for (unsigned i = 0; i < num_sgprs; ++i) {
                add_arg(&fninfo, ARG_SGPR, ctx->i32);
                returns[i] = ctx->i32;
        }

        for (unsigned i = 0; i < num_vgprs; ++i) {
                add_arg(&fninfo, ARG_VGPR, ctx->i32);
                returns[num_sgprs + i] = ctx->f32;
        }

        /* Create the function. */
        si_create_function(ctx, "gs_prolog", returns, num_sgprs + num_vgprs,
                           &fninfo, 0);
        func = ctx->main_fn;

        /* Set the full EXEC mask for the prolog, because we are only fiddling
         * with registers here. The main shader part will set the correct EXEC
         * mask.
         */
        if (ctx->screen->info.chip_class >= GFX9 && !key->gs_prolog.is_monolithic)
                ac_init_exec_full_mask(&ctx->ac);

        /* Copy inputs to outputs. This should be no-op, as the registers match,
         * but it will prevent the compiler from overwriting them unintentionally.
         */
        ret = ctx->return_value;
        for (unsigned i = 0; i < num_sgprs; i++) {
                LLVMValueRef p = LLVMGetParam(func, i);
                ret = LLVMBuildInsertValue(builder, ret, p, i, "");
        }
        for (unsigned i = 0; i < num_vgprs; i++) {
                LLVMValueRef p = LLVMGetParam(func, num_sgprs + i);
                p = ac_to_float(&ctx->ac, p);
                ret = LLVMBuildInsertValue(builder, ret, p, num_sgprs + i, "");
        }

        if (key->gs_prolog.states.tri_strip_adj_fix) {
                /* Remap the input vertices for every other primitive. */
                const unsigned gfx6_vtx_params[6] = {
                        num_sgprs,
                        num_sgprs + 1,
                        num_sgprs + 3,
                        num_sgprs + 4,
                        num_sgprs + 5,
                        num_sgprs + 6
                };
                const unsigned gfx9_vtx_params[3] = {
                        num_sgprs,
                        num_sgprs + 1,
                        num_sgprs + 4,
                };
                LLVMValueRef vtx_in[6], vtx_out[6];
                LLVMValueRef prim_id, rotate;

                if (ctx->screen->info.chip_class >= GFX9) {
                        for (unsigned i = 0; i < 3; i++) {
                                vtx_in[i*2] = si_unpack_param(ctx, gfx9_vtx_params[i], 0, 16);
                                vtx_in[i*2+1] = si_unpack_param(ctx, gfx9_vtx_params[i], 16, 16);
                        }
                } else {
                        for (unsigned i = 0; i < 6; i++)
                                vtx_in[i] = LLVMGetParam(func, gfx6_vtx_params[i]);
                }

                prim_id = LLVMGetParam(func, num_sgprs + 2);
                rotate = LLVMBuildTrunc(builder, prim_id, ctx->i1, "");

                for (unsigned i = 0; i < 6; ++i) {
                        LLVMValueRef base, rotated;
                        base = vtx_in[i];
                        rotated = vtx_in[(i + 4) % 6];
                        vtx_out[i] = LLVMBuildSelect(builder, rotate, rotated, base, "");
                }

                if (ctx->screen->info.chip_class >= GFX9) {
                        for (unsigned i = 0; i < 3; i++) {
                                LLVMValueRef hi, out;

                                hi = LLVMBuildShl(builder, vtx_out[i*2+1],
                                                  LLVMConstInt(ctx->i32, 16, 0), "");
                                out = LLVMBuildOr(builder, vtx_out[i*2], hi, "");
                                out = ac_to_float(&ctx->ac, out);
                                ret = LLVMBuildInsertValue(builder, ret, out,
                                                           gfx9_vtx_params[i], "");
                        }
                } else {
                        for (unsigned i = 0; i < 6; i++) {
                                LLVMValueRef out;

                                out = ac_to_float(&ctx->ac, vtx_out[i]);
                                ret = LLVMBuildInsertValue(builder, ret, out,
                                                           gfx6_vtx_params[i], "");
                        }
                }
        }

        LLVMBuildRet(builder, ret);
}

/**
 * Given a list of shader part functions, build a wrapper function that
 * runs them in sequence to form a monolithic shader.
 */
static void si_build_wrapper_function(struct si_shader_context *ctx,
                                      LLVMValueRef *parts,
                                      unsigned num_parts,
                                      unsigned main_part,
                                      unsigned next_shader_first_part)
{
        LLVMBuilderRef builder = ctx->ac.builder;
        /* PS epilog has one arg per color component; gfx9 merged shader
         * prologs need to forward 32 user SGPRs.
         */
        struct si_function_info fninfo;
        LLVMValueRef initial[64], out[64];
        LLVMTypeRef function_type;
        unsigned num_first_params;
        unsigned num_out, initial_num_out;
        MAYBE_UNUSED unsigned num_out_sgpr; /* used in debug checks */
        MAYBE_UNUSED unsigned initial_num_out_sgpr; /* used in debug checks */
        unsigned num_sgprs, num_vgprs;
        unsigned gprs;
        struct lp_build_if_state if_state;

        si_init_function_info(&fninfo);

        for (unsigned i = 0; i < num_parts; ++i) {
                ac_add_function_attr(ctx->ac.context, parts[i], -1,
                                     AC_FUNC_ATTR_ALWAYSINLINE);
                LLVMSetLinkage(parts[i], LLVMPrivateLinkage);
        }

        /* The parameters of the wrapper function correspond to those of the
         * first part in terms of SGPRs and VGPRs, but we use the types of the
         * main part to get the right types. This is relevant for the
         * dereferenceable attribute on descriptor table pointers.
         */
        num_sgprs = 0;
        num_vgprs = 0;

        function_type = LLVMGetElementType(LLVMTypeOf(parts[0]));
        num_first_params = LLVMCountParamTypes(function_type);

        for (unsigned i = 0; i < num_first_params; ++i) {
                LLVMValueRef param = LLVMGetParam(parts[0], i);

                if (ac_is_sgpr_param(param)) {
                        assert(num_vgprs == 0);
                        num_sgprs += ac_get_type_size(LLVMTypeOf(param)) / 4;
                } else {
                        num_vgprs += ac_get_type_size(LLVMTypeOf(param)) / 4;
                }
        }

        gprs = 0;
        while (gprs < num_sgprs + num_vgprs) {
                LLVMValueRef param = LLVMGetParam(parts[main_part], fninfo.num_params);
                LLVMTypeRef type = LLVMTypeOf(param);
                unsigned size = ac_get_type_size(type) / 4;

                add_arg(&fninfo, gprs < num_sgprs ? ARG_SGPR : ARG_VGPR, type);

                assert(ac_is_sgpr_param(param) == (gprs < num_sgprs));
                assert(gprs + size <= num_sgprs + num_vgprs &&
                       (gprs >= num_sgprs || gprs + size <= num_sgprs));

                gprs += size;
        }

        /* Prepare the return type. */
        unsigned num_returns = 0;
        LLVMTypeRef returns[32], last_func_type, return_type;

        last_func_type = LLVMGetElementType(LLVMTypeOf(parts[num_parts - 1]));
        return_type = LLVMGetReturnType(last_func_type);

        switch (LLVMGetTypeKind(return_type)) {
        case LLVMStructTypeKind:
                num_returns = LLVMCountStructElementTypes(return_type);
                assert(num_returns <= ARRAY_SIZE(returns));
                LLVMGetStructElementTypes(return_type, returns);
                break;
        case LLVMVoidTypeKind:
                break;
        default:
                unreachable("unexpected type");
        }

        si_create_function(ctx, "wrapper", returns, num_returns, &fninfo,
                           si_get_max_workgroup_size(ctx->shader));

        if (is_merged_shader(ctx))
                ac_init_exec_full_mask(&ctx->ac);

        /* Record the arguments of the function as if they were an output of
         * a previous part.
         */
        num_out = 0;
        num_out_sgpr = 0;

        for (unsigned i = 0; i < fninfo.num_params; ++i) {
                LLVMValueRef param = LLVMGetParam(ctx->main_fn, i);
                LLVMTypeRef param_type = LLVMTypeOf(param);
                LLVMTypeRef out_type = i < fninfo.num_sgpr_params ? ctx->i32 : ctx->f32;
                unsigned size = ac_get_type_size(param_type) / 4;

                if (size == 1) {
                        if (LLVMGetTypeKind(param_type) == LLVMPointerTypeKind) {
                                param = LLVMBuildPtrToInt(builder, param, ctx->i32, "");
                                param_type = ctx->i32;
                        }

                        if (param_type != out_type)
                                param = LLVMBuildBitCast(builder, param, out_type, "");
                        out[num_out++] = param;
                } else {
                        LLVMTypeRef vector_type = LLVMVectorType(out_type, size);

                        if (LLVMGetTypeKind(param_type) == LLVMPointerTypeKind) {
                                param = LLVMBuildPtrToInt(builder, param, ctx->i64, "");
                                param_type = ctx->i64;
                        }

                        if (param_type != vector_type)
                                param = LLVMBuildBitCast(builder, param, vector_type, "");

                        for (unsigned j = 0; j < size; ++j)
                                out[num_out++] = LLVMBuildExtractElement(
                                        builder, param, LLVMConstInt(ctx->i32, j, 0), "");
                }

                if (i < fninfo.num_sgpr_params)
                        num_out_sgpr = num_out;
        }

        memcpy(initial, out, sizeof(out));
        initial_num_out = num_out;
        initial_num_out_sgpr = num_out_sgpr;

        /* Now chain the parts. */
        LLVMValueRef ret;
        for (unsigned part = 0; part < num_parts; ++part) {
                LLVMValueRef in[48];
                LLVMTypeRef ret_type;
                unsigned out_idx = 0;
                unsigned num_params = LLVMCountParams(parts[part]);

                /* Merged shaders are executed conditionally depending
                 * on the number of enabled threads passed in the input SGPRs. */
                if (is_merged_shader(ctx) && part == 0) {
                        LLVMValueRef ena, count = initial[3];

                        count = LLVMBuildAnd(builder, count,
                                             LLVMConstInt(ctx->i32, 0x7f, 0), "");
                        ena = LLVMBuildICmp(builder, LLVMIntULT,
                                            ac_get_thread_id(&ctx->ac), count, "");
                        lp_build_if(&if_state, &ctx->gallivm, ena);
                }

                /* Derive arguments for the next part from outputs of the
                 * previous one.
                 */
                for (unsigned param_idx = 0; param_idx < num_params; ++param_idx) {
                        LLVMValueRef param;
                        LLVMTypeRef param_type;
                        bool is_sgpr;
                        unsigned param_size;
                        LLVMValueRef arg = NULL;

                        param = LLVMGetParam(parts[part], param_idx);
                        param_type = LLVMTypeOf(param);
                        param_size = ac_get_type_size(param_type) / 4;
                        is_sgpr = ac_is_sgpr_param(param);

                        if (is_sgpr) {
                                ac_add_function_attr(ctx->ac.context, parts[part],
                                                     param_idx + 1, AC_FUNC_ATTR_INREG);
                        } else if (out_idx < num_out_sgpr) {
                                /* Skip returned SGPRs the current part doesn't
                                 * declare on the input. */
                                out_idx = num_out_sgpr;
                        }

                        assert(out_idx + param_size <= (is_sgpr ? num_out_sgpr : num_out));

                        if (param_size == 1)
                                arg = out[out_idx];
                        else
                                arg = ac_build_gather_values(&ctx->ac, &out[out_idx], param_size);

                        if (LLVMTypeOf(arg) != param_type) {
                                if (LLVMGetTypeKind(param_type) == LLVMPointerTypeKind) {
                                        if (LLVMGetPointerAddressSpace(param_type) ==
                                            AC_ADDR_SPACE_CONST_32BIT) {
                                                arg = LLVMBuildBitCast(builder, arg, ctx->i32, "");
                                                arg = LLVMBuildIntToPtr(builder, arg, param_type, "");
                                        } else {
                                                arg = LLVMBuildBitCast(builder, arg, ctx->i64, "");
                                                arg = LLVMBuildIntToPtr(builder, arg, param_type, "");
                                        }
                                } else {
                                        arg = LLVMBuildBitCast(builder, arg, param_type, "");
                                }
                        }

                        in[param_idx] = arg;
                        out_idx += param_size;
                }

                ret = LLVMBuildCall(builder, parts[part], in, num_params, "");

                if (is_merged_shader(ctx) &&
                    part + 1 == next_shader_first_part) {
                        lp_build_endif(&if_state);

                        /* The second half of the merged shader should use
                         * the inputs from the toplevel (wrapper) function,
                         * not the return value from the last call.
                         *
                         * That's because the last call was executed condi-
                         * tionally, so we can't consume it in the main
                         * block.
                         */
                        memcpy(out, initial, sizeof(initial));
                        num_out = initial_num_out;
                        num_out_sgpr = initial_num_out_sgpr;
                        continue;
                }

                /* Extract the returned GPRs. */
                ret_type = LLVMTypeOf(ret);
                num_out = 0;
                num_out_sgpr = 0;

                if (LLVMGetTypeKind(ret_type) != LLVMVoidTypeKind) {
                        assert(LLVMGetTypeKind(ret_type) == LLVMStructTypeKind);

                        unsigned ret_size = LLVMCountStructElementTypes(ret_type);

                        for (unsigned i = 0; i < ret_size; ++i) {
                                LLVMValueRef val =
                                        LLVMBuildExtractValue(builder, ret, i, "");

                                assert(num_out < ARRAY_SIZE(out));
                                out[num_out++] = val;

                                if (LLVMTypeOf(val) == ctx->i32) {
                                        assert(num_out_sgpr + 1 == num_out);
                                        num_out_sgpr = num_out;
                                }
                        }
                }
        }

        /* Return the value from the last part. */
        if (LLVMGetTypeKind(LLVMTypeOf(ret)) == LLVMVoidTypeKind)
                LLVMBuildRetVoid(builder);
        else
                LLVMBuildRet(builder, ret);
}

static bool si_should_optimize_less(struct ac_llvm_compiler *compiler,
                                    struct si_shader_selector *sel)
{
        if (!compiler->low_opt_passes)
                return false;

        /* Assume a slow CPU. */
        assert(!sel->screen->info.has_dedicated_vram &&
               sel->screen->info.chip_class <= GFX8);

        /* For a crazy dEQP test containing 2597 memory opcodes, mostly
         * buffer stores. */
        return sel->type == PIPE_SHADER_COMPUTE &&
               sel->info.num_memory_instructions > 1000;
}

int si_compile_tgsi_shader(struct si_screen *sscreen,
                           struct ac_llvm_compiler *compiler,
                           struct si_shader *shader,
                           struct pipe_debug_callback *debug)
{
        struct si_shader_selector *sel = shader->selector;
        struct si_shader_context ctx;
        int r = -1;

        /* Dump TGSI code before doing TGSI->LLVM conversion in case the
         * conversion fails. */
        if (si_can_dump_shader(sscreen, sel->info.processor) &&
            !(sscreen->debug_flags & DBG(NO_TGSI))) {
                if (sel->tokens)
                        tgsi_dump(sel->tokens, 0);
                else
                        nir_print_shader(sel->nir, stderr);
                si_dump_streamout(&sel->so);
        }

        si_init_shader_ctx(&ctx, sscreen, compiler);
        si_llvm_context_set_tgsi(&ctx, shader);

        memset(shader->info.vs_output_param_offset, AC_EXP_PARAM_UNDEFINED,
               sizeof(shader->info.vs_output_param_offset));

        shader->info.uses_instanceid = sel->info.uses_instanceid;

        if (!si_compile_tgsi_main(&ctx)) {
                si_llvm_dispose(&ctx);
                return -1;
        }

        if (shader->is_monolithic && ctx.type == PIPE_SHADER_VERTEX) {
                LLVMValueRef parts[2];
                bool need_prolog = sel->vs_needs_prolog;

                parts[1] = ctx.main_fn;

                if (need_prolog) {
                        union si_shader_part_key prolog_key;
                        si_get_vs_prolog_key(&sel->info,
                                             shader->info.num_input_sgprs,
                                             &shader->key.part.vs.prolog,
                                             shader, &prolog_key);
                        si_build_vs_prolog_function(&ctx, &prolog_key);
                        parts[0] = ctx.main_fn;
                }

                si_build_wrapper_function(&ctx, parts + !need_prolog,
                                          1 + need_prolog, need_prolog, 0);
        } else if (shader->is_monolithic && ctx.type == PIPE_SHADER_TESS_CTRL) {
                if (sscreen->info.chip_class >= GFX9) {
                        struct si_shader_selector *ls = shader->key.part.tcs.ls;
                        LLVMValueRef parts[4];
                        bool vs_needs_prolog =
                                si_vs_needs_prolog(ls, &shader->key.part.tcs.ls_prolog);

                        /* TCS main part */
                        parts[2] = ctx.main_fn;

                        /* TCS epilog */
                        union si_shader_part_key tcs_epilog_key;
                        memset(&tcs_epilog_key, 0, sizeof(tcs_epilog_key));
                        tcs_epilog_key.tcs_epilog.states = shader->key.part.tcs.epilog;
                        si_build_tcs_epilog_function(&ctx, &tcs_epilog_key);
                        parts[3] = ctx.main_fn;

                        /* VS as LS main part */
                        struct si_shader shader_ls = {};
                        shader_ls.selector = ls;
                        shader_ls.key.as_ls = 1;
                        shader_ls.key.mono = shader->key.mono;
                        shader_ls.key.opt = shader->key.opt;
                        shader_ls.is_monolithic = true;
                        si_llvm_context_set_tgsi(&ctx, &shader_ls);

                        if (!si_compile_tgsi_main(&ctx)) {
                                si_llvm_dispose(&ctx);
                                return -1;
                        }
                        shader->info.uses_instanceid |= ls->info.uses_instanceid;
                        parts[1] = ctx.main_fn;

                        /* LS prolog */
                        if (vs_needs_prolog) {
                                union si_shader_part_key vs_prolog_key;
                                si_get_vs_prolog_key(&ls->info,
                                                     shader_ls.info.num_input_sgprs,
                                                     &shader->key.part.tcs.ls_prolog,
                                                     shader, &vs_prolog_key);
                                vs_prolog_key.vs_prolog.is_monolithic = true;
                                si_build_vs_prolog_function(&ctx, &vs_prolog_key);
                                parts[0] = ctx.main_fn;
                        }

                        /* Reset the shader context. */
                        ctx.shader = shader;
                        ctx.type = PIPE_SHADER_TESS_CTRL;

                        si_build_wrapper_function(&ctx,
                                                  parts + !vs_needs_prolog,
                                                  4 - !vs_needs_prolog, vs_needs_prolog,
                                                  vs_needs_prolog ? 2 : 1);
                } else {
                        LLVMValueRef parts[2];
                        union si_shader_part_key epilog_key;

                        parts[0] = ctx.main_fn;

                        memset(&epilog_key, 0, sizeof(epilog_key));
                        epilog_key.tcs_epilog.states = shader->key.part.tcs.epilog;
                        si_build_tcs_epilog_function(&ctx, &epilog_key);
                        parts[1] = ctx.main_fn;

                        si_build_wrapper_function(&ctx, parts, 2, 0, 0);
                }
        } else if (shader->is_monolithic && ctx.type == PIPE_SHADER_GEOMETRY) {
                if (ctx.screen->info.chip_class >= GFX9) {
                        struct si_shader_selector *es = shader->key.part.gs.es;
                        LLVMValueRef es_prolog = NULL;
                        LLVMValueRef es_main = NULL;
                        LLVMValueRef gs_prolog = NULL;
                        LLVMValueRef gs_main = ctx.main_fn;

                        /* GS prolog */
                        union si_shader_part_key gs_prolog_key;
                        memset(&gs_prolog_key, 0, sizeof(gs_prolog_key));
                        gs_prolog_key.gs_prolog.states = shader->key.part.gs.prolog;
                        gs_prolog_key.gs_prolog.is_monolithic = true;
                        si_build_gs_prolog_function(&ctx, &gs_prolog_key);
                        gs_prolog = ctx.main_fn;

                        /* ES main part */
                        struct si_shader shader_es = {};
                        shader_es.selector = es;
                        shader_es.key.as_es = 1;
                        shader_es.key.mono = shader->key.mono;
                        shader_es.key.opt = shader->key.opt;
                        shader_es.is_monolithic = true;
                        si_llvm_context_set_tgsi(&ctx, &shader_es);

                        if (!si_compile_tgsi_main(&ctx)) {
                                si_llvm_dispose(&ctx);
                                return -1;
                        }
                        shader->info.uses_instanceid |= es->info.uses_instanceid;
                        es_main = ctx.main_fn;

                        /* ES prolog */
                        if (es->vs_needs_prolog) {
                                union si_shader_part_key vs_prolog_key;
                                si_get_vs_prolog_key(&es->info,
                                                     shader_es.info.num_input_sgprs,
                                                     &shader->key.part.gs.vs_prolog,
                                                     shader, &vs_prolog_key);
                                vs_prolog_key.vs_prolog.is_monolithic = true;
                                si_build_vs_prolog_function(&ctx, &vs_prolog_key);
                                es_prolog = ctx.main_fn;
                        }

                        /* Reset the shader context. */
                        ctx.shader = shader;
                        ctx.type = PIPE_SHADER_GEOMETRY;

                        /* Prepare the array of shader parts. */
                        LLVMValueRef parts[4];
                        unsigned num_parts = 0, main_part, next_first_part;

                        if (es_prolog)
                                parts[num_parts++] = es_prolog;

                        parts[main_part = num_parts++] = es_main;
                        parts[next_first_part = num_parts++] = gs_prolog;
                        parts[num_parts++] = gs_main;

                        si_build_wrapper_function(&ctx, parts, num_parts,
                                                  main_part, next_first_part);
                } else {
                        LLVMValueRef parts[2];
                        union si_shader_part_key prolog_key;

                        parts[1] = ctx.main_fn;

                        memset(&prolog_key, 0, sizeof(prolog_key));
                        prolog_key.gs_prolog.states = shader->key.part.gs.prolog;
                        si_build_gs_prolog_function(&ctx, &prolog_key);
                        parts[0] = ctx.main_fn;

                        si_build_wrapper_function(&ctx, parts, 2, 1, 0);
                }
        } else if (shader->is_monolithic && ctx.type == PIPE_SHADER_FRAGMENT) {
                LLVMValueRef parts[3];
                union si_shader_part_key prolog_key;
                union si_shader_part_key epilog_key;
                bool need_prolog;

                si_get_ps_prolog_key(shader, &prolog_key, false);
                need_prolog = si_need_ps_prolog(&prolog_key);

                parts[need_prolog ? 1 : 0] = ctx.main_fn;

                if (need_prolog) {
                        si_build_ps_prolog_function(&ctx, &prolog_key);
                        parts[0] = ctx.main_fn;
                }

                si_get_ps_epilog_key(shader, &epilog_key);
                si_build_ps_epilog_function(&ctx, &epilog_key);
                parts[need_prolog ? 2 : 1] = ctx.main_fn;

                si_build_wrapper_function(&ctx, parts, need_prolog ? 3 : 2,
                                          need_prolog ? 1 : 0, 0);
        }

        si_llvm_optimize_module(&ctx);

        /* Post-optimization transformations and analysis. */
        si_optimize_vs_outputs(&ctx);

        if ((debug && debug->debug_message) ||
            si_can_dump_shader(sscreen, ctx.type)) {
                ctx.shader->config.private_mem_vgprs =
                        ac_count_scratch_private_memory(ctx.main_fn);
        }

        /* Make sure the input is a pointer and not integer followed by inttoptr. */
        assert(LLVMGetTypeKind(LLVMTypeOf(LLVMGetParam(ctx.main_fn, 0))) ==
               LLVMPointerTypeKind);

        /* Compile to bytecode. */
        r = si_compile_llvm(sscreen, &shader->binary, &shader->config, compiler,
                            ctx.ac.module, debug, ctx.type,
                            si_get_shader_name(shader, ctx.type),
                            si_should_optimize_less(compiler, shader->selector));
        si_llvm_dispose(&ctx);
        if (r) {
                fprintf(stderr, "LLVM failed to compile shader\n");
                return r;
        }

        /* Validate SGPR and VGPR usage for compute to detect compiler bugs.
         * LLVM 3.9svn has this bug.
         */
        if (sel->type == PIPE_SHADER_COMPUTE) {
                unsigned wave_size = 64;
                unsigned max_vgprs = 256;
                unsigned max_sgprs = sscreen->info.chip_class >= GFX8 ? 800 : 512;
                unsigned max_sgprs_per_wave = 128;
                unsigned max_block_threads = si_get_max_workgroup_size(shader);
                unsigned min_waves_per_cu = DIV_ROUND_UP(max_block_threads, wave_size);
                unsigned min_waves_per_simd = DIV_ROUND_UP(min_waves_per_cu, 4);

                max_vgprs = max_vgprs / min_waves_per_simd;
                max_sgprs = MIN2(max_sgprs / min_waves_per_simd, max_sgprs_per_wave);

                if (shader->config.num_sgprs > max_sgprs ||
                    shader->config.num_vgprs > max_vgprs) {
                        fprintf(stderr, "LLVM failed to compile a shader correctly: "
                                "SGPR:VGPR usage is %u:%u, but the hw limit is %u:%u\n",
                                shader->config.num_sgprs, shader->config.num_vgprs,
                                max_sgprs, max_vgprs);

                        /* Just terminate the process, because dependent
                         * shaders can hang due to bad input data, but use
                         * the env var to allow shader-db to work.
                         */
                        if (!debug_get_bool_option("SI_PASS_BAD_SHADERS", false))
                                abort();
                }
        }

        /* Add the scratch offset to input SGPRs. */
        if (shader->config.scratch_bytes_per_wave && !is_merged_shader(&ctx))
                shader->info.num_input_sgprs += 1; /* scratch byte offset */

        /* Calculate the number of fragment input VGPRs. */
        if (ctx.type == PIPE_SHADER_FRAGMENT) {
                shader->info.num_input_vgprs = 0;
                shader->info.face_vgpr_index = -1;
                shader->info.ancillary_vgpr_index = -1;

                if (G_0286CC_PERSP_SAMPLE_ENA(shader->config.spi_ps_input_addr))
                        shader->info.num_input_vgprs += 2;
                if (G_0286CC_PERSP_CENTER_ENA(shader->config.spi_ps_input_addr))
                        shader->info.num_input_vgprs += 2;
                if (G_0286CC_PERSP_CENTROID_ENA(shader->config.spi_ps_input_addr))
                        shader->info.num_input_vgprs += 2;
                if (G_0286CC_PERSP_PULL_MODEL_ENA(shader->config.spi_ps_input_addr))
                        shader->info.num_input_vgprs += 3;
                if (G_0286CC_LINEAR_SAMPLE_ENA(shader->config.spi_ps_input_addr))
                        shader->info.num_input_vgprs += 2;
                if (G_0286CC_LINEAR_CENTER_ENA(shader->config.spi_ps_input_addr))
                        shader->info.num_input_vgprs += 2;
                if (G_0286CC_LINEAR_CENTROID_ENA(shader->config.spi_ps_input_addr))
                        shader->info.num_input_vgprs += 2;
                if (G_0286CC_LINE_STIPPLE_TEX_ENA(shader->config.spi_ps_input_addr))
                        shader->info.num_input_vgprs += 1;
                if (G_0286CC_POS_X_FLOAT_ENA(shader->config.spi_ps_input_addr))
                        shader->info.num_input_vgprs += 1;
                if (G_0286CC_POS_Y_FLOAT_ENA(shader->config.spi_ps_input_addr))
                        shader->info.num_input_vgprs += 1;
                if (G_0286CC_POS_Z_FLOAT_ENA(shader->config.spi_ps_input_addr))
                        shader->info.num_input_vgprs += 1;
                if (G_0286CC_POS_W_FLOAT_ENA(shader->config.spi_ps_input_addr))
                        shader->info.num_input_vgprs += 1;
                if (G_0286CC_FRONT_FACE_ENA(shader->config.spi_ps_input_addr)) {
                        shader->info.face_vgpr_index = shader->info.num_input_vgprs;
                        shader->info.num_input_vgprs += 1;
                }
                if (G_0286CC_ANCILLARY_ENA(shader->config.spi_ps_input_addr)) {
                        shader->info.ancillary_vgpr_index = shader->info.num_input_vgprs;
                        shader->info.num_input_vgprs += 1;
                }
                if (G_0286CC_SAMPLE_COVERAGE_ENA(shader->config.spi_ps_input_addr))
                        shader->info.num_input_vgprs += 1;
                if (G_0286CC_POS_FIXED_PT_ENA(shader->config.spi_ps_input_addr))
                        shader->info.num_input_vgprs += 1;
        }

        si_calculate_max_simd_waves(shader);
        si_shader_dump_stats_for_shader_db(shader, debug);
        return 0;
}

/**
 * Create, compile and return a shader part (prolog or epilog).
 *
 * \param sscreen       screen
 * \param list          list of shader parts of the same category
 * \param type          shader type
 * \param key           shader part key
 * \param prolog        whether the part being requested is a prolog
 * \param tm            LLVM target machine
 * \param debug         debug callback
 * \param build         the callback responsible for building the main function
 * \return              non-NULL on success
 */
static struct si_shader_part *
si_get_shader_part(struct si_screen *sscreen,
                   struct si_shader_part **list,
                   enum pipe_shader_type type,
                   bool prolog,
                   union si_shader_part_key *key,
                   struct ac_llvm_compiler *compiler,
                   struct pipe_debug_callback *debug,
                   void (*build)(struct si_shader_context *,
                                 union si_shader_part_key *),
                   const char *name)
{
        struct si_shader_part *result;

        mtx_lock(&sscreen->shader_parts_mutex);

        /* Find existing. */
        for (result = *list; result; result = result->next) {
                if (memcmp(&result->key, key, sizeof(*key)) == 0) {
                        mtx_unlock(&sscreen->shader_parts_mutex);
                        return result;
                }
        }

        /* Compile a new one. */
        result = CALLOC_STRUCT(si_shader_part);
        result->key = *key;

        struct si_shader shader = {};
        struct si_shader_context ctx;

        si_init_shader_ctx(&ctx, sscreen, compiler);
        ctx.shader = &shader;
        ctx.type = type;

        switch (type) {
        case PIPE_SHADER_VERTEX:
                shader.key.as_ls = key->vs_prolog.as_ls;
                shader.key.as_es = key->vs_prolog.as_es;
                break;
        case PIPE_SHADER_TESS_CTRL:
                assert(!prolog);
                shader.key.part.tcs.epilog = key->tcs_epilog.states;
                break;
        case PIPE_SHADER_GEOMETRY:
                assert(prolog);
                break;
        case PIPE_SHADER_FRAGMENT:
                if (prolog)
                        shader.key.part.ps.prolog = key->ps_prolog.states;
                else
                        shader.key.part.ps.epilog = key->ps_epilog.states;
                break;
        default:
                unreachable("bad shader part");
        }

        build(&ctx, key);

        /* Compile. */
        si_llvm_optimize_module(&ctx);

        if (si_compile_llvm(sscreen, &result->binary, &result->config, compiler,
                            ctx.ac.module, debug, ctx.type, name, false)) {
                FREE(result);
                result = NULL;
                goto out;
        }

        result->next = *list;
        *list = result;

out:
        si_llvm_dispose(&ctx);
        mtx_unlock(&sscreen->shader_parts_mutex);
        return result;
}

static LLVMValueRef si_prolog_get_rw_buffers(struct si_shader_context *ctx)
{
        LLVMValueRef ptr[2], list;
        bool merged_shader = is_merged_shader(ctx);

        ptr[0] = LLVMGetParam(ctx->main_fn, (merged_shader ? 8 : 0) + SI_SGPR_RW_BUFFERS);
        list = LLVMBuildIntToPtr(ctx->ac.builder, ptr[0],
                                 ac_array_in_const32_addr_space(ctx->v4i32), "");
        return list;
}

/**
 * Build the vertex shader prolog function.
 *
 * The inputs are the same as VS (a lot of SGPRs and 4 VGPR system values).
 * All inputs are returned unmodified. The vertex load indices are
 * stored after them, which will be used by the API VS for fetching inputs.
 *
 * For example, the expected outputs for instance_divisors[] = {0, 1, 2} are:
 *   input_v0,
 *   input_v1,
 *   input_v2,
 *   input_v3,
 *   (VertexID + BaseVertex),
 *   (InstanceID + StartInstance),
 *   (InstanceID / 2 + StartInstance)
 */
static void si_build_vs_prolog_function(struct si_shader_context *ctx,
                                        union si_shader_part_key *key)
{
        struct si_function_info fninfo;
        LLVMTypeRef *returns;
        LLVMValueRef ret, func;
        int num_returns, i;
        unsigned first_vs_vgpr = key->vs_prolog.num_merged_next_stage_vgprs;
        unsigned num_input_vgprs = key->vs_prolog.num_merged_next_stage_vgprs + 4;
        LLVMValueRef input_vgprs[9];
        unsigned num_all_input_regs = key->vs_prolog.num_input_sgprs +
                                      num_input_vgprs;
        unsigned user_sgpr_base = key->vs_prolog.num_merged_next_stage_vgprs ? 8 : 0;

        si_init_function_info(&fninfo);

        /* 4 preloaded VGPRs + vertex load indices as prolog outputs */
        returns = alloca((num_all_input_regs + key->vs_prolog.last_input + 1) *
                         sizeof(LLVMTypeRef));
        num_returns = 0;

        /* Declare input and output SGPRs. */
        for (i = 0; i < key->vs_prolog.num_input_sgprs; i++) {
                add_arg(&fninfo, ARG_SGPR, ctx->i32);
                returns[num_returns++] = ctx->i32;
        }

        /* Preloaded VGPRs (outputs must be floats) */
        for (i = 0; i < num_input_vgprs; i++) {
                add_arg_assign(&fninfo, ARG_VGPR, ctx->i32, &input_vgprs[i]);
                returns[num_returns++] = ctx->f32;
        }

        /* Vertex load indices. */
        for (i = 0; i <= key->vs_prolog.last_input; i++)
                returns[num_returns++] = ctx->f32;

        /* Create the function. */
        si_create_function(ctx, "vs_prolog", returns, num_returns, &fninfo, 0);
        func = ctx->main_fn;

        if (key->vs_prolog.num_merged_next_stage_vgprs) {
                if (!key->vs_prolog.is_monolithic)
                        si_init_exec_from_input(ctx, 3, 0);

                if (key->vs_prolog.as_ls &&
                    ctx->screen->has_ls_vgpr_init_bug) {
                        /* If there are no HS threads, SPI loads the LS VGPRs
                         * starting at VGPR 0. Shift them back to where they
                         * belong.
                         */
                        LLVMValueRef has_hs_threads =
                                LLVMBuildICmp(ctx->ac.builder, LLVMIntNE,
                                    si_unpack_param(ctx, 3, 8, 8),
                                    ctx->i32_0, "");

                        for (i = 4; i > 0; --i) {
                                input_vgprs[i + 1] =
                                        LLVMBuildSelect(ctx->ac.builder, has_hs_threads,
                                                        input_vgprs[i + 1],
                                                        input_vgprs[i - 1], "");
                        }
                }
        }

        unsigned vertex_id_vgpr = first_vs_vgpr;
        unsigned instance_id_vgpr = first_vs_vgpr + (key->vs_prolog.as_ls ? 2 : 1);

        ctx->abi.vertex_id = input_vgprs[vertex_id_vgpr];
        ctx->abi.instance_id = input_vgprs[instance_id_vgpr];

        /* InstanceID = VertexID >> 16;
         * VertexID   = VertexID & 0xffff;
         */
        if (key->vs_prolog.states.unpack_instance_id_from_vertex_id) {
                ctx->abi.instance_id = LLVMBuildLShr(ctx->ac.builder, ctx->abi.vertex_id,
                                                     LLVMConstInt(ctx->i32, 16, 0), "");
                ctx->abi.vertex_id = LLVMBuildAnd(ctx->ac.builder, ctx->abi.vertex_id,
                                                  LLVMConstInt(ctx->i32, 0xffff, 0), "");
        }

        /* Copy inputs to outputs. This should be no-op, as the registers match,
         * but it will prevent the compiler from overwriting them unintentionally.
         */
        ret = ctx->return_value;
        for (i = 0; i < key->vs_prolog.num_input_sgprs; i++) {
                LLVMValueRef p = LLVMGetParam(func, i);
                ret = LLVMBuildInsertValue(ctx->ac.builder, ret, p, i, "");
        }
        for (i = 0; i < num_input_vgprs; i++) {
                LLVMValueRef p = input_vgprs[i];

                if (i == vertex_id_vgpr)
                        p = ctx->abi.vertex_id;
                else if (i == instance_id_vgpr)
                        p = ctx->abi.instance_id;

                p = ac_to_float(&ctx->ac, p);
                ret = LLVMBuildInsertValue(ctx->ac.builder, ret, p,
                                           key->vs_prolog.num_input_sgprs + i, "");
        }

        /* Compute vertex load indices from instance divisors. */
        LLVMValueRef instance_divisor_constbuf = NULL;

        if (key->vs_prolog.states.instance_divisor_is_fetched) {
                LLVMValueRef list = si_prolog_get_rw_buffers(ctx);
                LLVMValueRef buf_index =
                        LLVMConstInt(ctx->i32, SI_VS_CONST_INSTANCE_DIVISORS, 0);
                instance_divisor_constbuf =
                        ac_build_load_to_sgpr(&ctx->ac, list, buf_index);
        }

        for (i = 0; i <= key->vs_prolog.last_input; i++) {
                bool divisor_is_one =
                        key->vs_prolog.states.instance_divisor_is_one & (1u << i);
                bool divisor_is_fetched =
                        key->vs_prolog.states.instance_divisor_is_fetched & (1u << i);
                LLVMValueRef index = NULL;

                if (divisor_is_one) {
                        index = ctx->abi.instance_id;
                } else if (divisor_is_fetched) {
                        LLVMValueRef udiv_factors[4];

                        for (unsigned j = 0; j < 4; j++) {
                                udiv_factors[j] =
                                        buffer_load_const(ctx, instance_divisor_constbuf,
                                                          LLVMConstInt(ctx->i32, i*16 + j*4, 0));
                                udiv_factors[j] = ac_to_integer(&ctx->ac, udiv_factors[j]);
                        }
                        /* The faster NUW version doesn't work when InstanceID == UINT_MAX.
                         * Such InstanceID might not be achievable in a reasonable time though.
                         */
                        index = ac_build_fast_udiv_nuw(&ctx->ac, ctx->abi.instance_id,
                                                       udiv_factors[0], udiv_factors[1],
                                                       udiv_factors[2], udiv_factors[3]);
                }

                if (divisor_is_one || divisor_is_fetched) {
                        /* Add StartInstance. */
                        index = LLVMBuildAdd(ctx->ac.builder, index,
                                             LLVMGetParam(ctx->main_fn, user_sgpr_base +
                                                          SI_SGPR_START_INSTANCE), "");
                } else {
                        /* VertexID + BaseVertex */
                        index = LLVMBuildAdd(ctx->ac.builder,
                                             ctx->abi.vertex_id,
                                             LLVMGetParam(func, user_sgpr_base +
                                                                SI_SGPR_BASE_VERTEX), "");
                }

                index = ac_to_float(&ctx->ac, index);
                ret = LLVMBuildInsertValue(ctx->ac.builder, ret, index,
                                           fninfo.num_params + i, "");
        }

        si_llvm_build_ret(ctx, ret);
}

static bool si_get_vs_prolog(struct si_screen *sscreen,
                             struct ac_llvm_compiler *compiler,
                             struct si_shader *shader,
                             struct pipe_debug_callback *debug,
                             struct si_shader *main_part,
                             const struct si_vs_prolog_bits *key)
{
        struct si_shader_selector *vs = main_part->selector;

        if (!si_vs_needs_prolog(vs, key))
                return true;

        /* Get the prolog. */
        union si_shader_part_key prolog_key;
        si_get_vs_prolog_key(&vs->info, main_part->info.num_input_sgprs,
                             key, shader, &prolog_key);

        shader->prolog =
                si_get_shader_part(sscreen, &sscreen->vs_prologs,
                                   PIPE_SHADER_VERTEX, true, &prolog_key, compiler,
                                   debug, si_build_vs_prolog_function,
                                   "Vertex Shader Prolog");
        return shader->prolog != NULL;
}

/**
 * Select and compile (or reuse) vertex shader parts (prolog & epilog).
 */
static bool si_shader_select_vs_parts(struct si_screen *sscreen,
                                      struct ac_llvm_compiler *compiler,
                                      struct si_shader *shader,
                                      struct pipe_debug_callback *debug)
{
        return si_get_vs_prolog(sscreen, compiler, shader, debug, shader,
                                &shader->key.part.vs.prolog);
}

/**
 * Compile the TCS epilog function. This writes tesselation factors to memory
 * based on the output primitive type of the tesselator (determined by TES).
 */
static void si_build_tcs_epilog_function(struct si_shader_context *ctx,
                                         union si_shader_part_key *key)
{
        struct lp_build_tgsi_context *bld_base = &ctx->bld_base;
        struct si_function_info fninfo;
        LLVMValueRef func;

        si_init_function_info(&fninfo);

        if (ctx->screen->info.chip_class >= GFX9) {
                add_arg(&fninfo, ARG_SGPR, ctx->i32);
                add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_tcs_offchip_offset = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                add_arg(&fninfo, ARG_SGPR, ctx->i32); /* wave info */
                ctx->param_tcs_factor_offset = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                add_arg(&fninfo, ARG_SGPR, ctx->i32);
                add_arg(&fninfo, ARG_SGPR, ctx->i32);
                add_arg(&fninfo, ARG_SGPR, ctx->i32);
                add_arg(&fninfo, ARG_SGPR, ctx->ac.intptr);
                add_arg(&fninfo, ARG_SGPR, ctx->ac.intptr);
                add_arg(&fninfo, ARG_SGPR, ctx->ac.intptr);
                add_arg(&fninfo, ARG_SGPR, ctx->ac.intptr);
                add_arg(&fninfo, ARG_SGPR, ctx->i32);
                add_arg(&fninfo, ARG_SGPR, ctx->i32);
                add_arg(&fninfo, ARG_SGPR, ctx->i32);
                add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_tcs_offchip_layout = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_tcs_out_lds_layout = add_arg(&fninfo, ARG_SGPR, ctx->i32);
        } else {
                add_arg(&fninfo, ARG_SGPR, ctx->ac.intptr);
                add_arg(&fninfo, ARG_SGPR, ctx->ac.intptr);
                add_arg(&fninfo, ARG_SGPR, ctx->ac.intptr);
                add_arg(&fninfo, ARG_SGPR, ctx->ac.intptr);
                ctx->param_tcs_offchip_layout = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_tcs_out_lds_layout = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_tcs_offchip_offset = add_arg(&fninfo, ARG_SGPR, ctx->i32);
                ctx->param_tcs_factor_offset = add_arg(&fninfo, ARG_SGPR, ctx->i32);
        }

        add_arg(&fninfo, ARG_VGPR, ctx->i32); /* VGPR gap */
        add_arg(&fninfo, ARG_VGPR, ctx->i32); /* VGPR gap */
        unsigned tess_factors_idx =
                add_arg(&fninfo, ARG_VGPR, ctx->i32); /* patch index within the wave (REL_PATCH_ID) */
        add_arg(&fninfo, ARG_VGPR, ctx->i32); /* invocation ID within the patch */
        add_arg(&fninfo, ARG_VGPR, ctx->i32); /* LDS offset where tess factors should be loaded from */

        for (unsigned i = 0; i < 6; i++)
                add_arg(&fninfo, ARG_VGPR, ctx->i32); /* tess factors */

        /* Create the function. */
        si_create_function(ctx, "tcs_epilog", NULL, 0, &fninfo,
                           ctx->screen->info.chip_class >= GFX7 ? 128 : 64);
        ac_declare_lds_as_pointer(&ctx->ac);
        func = ctx->main_fn;

        LLVMValueRef invoc0_tess_factors[6];
        for (unsigned i = 0; i < 6; i++)
                invoc0_tess_factors[i] = LLVMGetParam(func, tess_factors_idx + 3 + i);

        si_write_tess_factors(bld_base,
                              LLVMGetParam(func, tess_factors_idx),
                              LLVMGetParam(func, tess_factors_idx + 1),
                              LLVMGetParam(func, tess_factors_idx + 2),
                              invoc0_tess_factors, invoc0_tess_factors + 4);

        LLVMBuildRetVoid(ctx->ac.builder);
}

/**
 * Select and compile (or reuse) TCS parts (epilog).
 */
static bool si_shader_select_tcs_parts(struct si_screen *sscreen,
                                       struct ac_llvm_compiler *compiler,
                                       struct si_shader *shader,
                                       struct pipe_debug_callback *debug)
{
        if (sscreen->info.chip_class >= GFX9) {
                struct si_shader *ls_main_part =
                        shader->key.part.tcs.ls->main_shader_part_ls;

                if (!si_get_vs_prolog(sscreen, compiler, shader, debug, ls_main_part,
                                      &shader->key.part.tcs.ls_prolog))
                        return false;

                shader->previous_stage = ls_main_part;
        }

        /* Get the epilog. */
        union si_shader_part_key epilog_key;
        memset(&epilog_key, 0, sizeof(epilog_key));
        epilog_key.tcs_epilog.states = shader->key.part.tcs.epilog;

        shader->epilog = si_get_shader_part(sscreen, &sscreen->tcs_epilogs,
                                            PIPE_SHADER_TESS_CTRL, false,
                                            &epilog_key, compiler, debug,
                                            si_build_tcs_epilog_function,
                                            "Tessellation Control Shader Epilog");
        return shader->epilog != NULL;
}

/**
 * Select and compile (or reuse) GS parts (prolog).
 */
static bool si_shader_select_gs_parts(struct si_screen *sscreen,
                                      struct ac_llvm_compiler *compiler,
                                      struct si_shader *shader,
                                      struct pipe_debug_callback *debug)
{
        if (sscreen->info.chip_class >= GFX9) {
                struct si_shader *es_main_part =
                        shader->key.part.gs.es->main_shader_part_es;

                if (shader->key.part.gs.es->type == PIPE_SHADER_VERTEX &&
                    !si_get_vs_prolog(sscreen, compiler, shader, debug, es_main_part,
                                      &shader->key.part.gs.vs_prolog))
                        return false;

                shader->previous_stage = es_main_part;
        }

        if (!shader->key.part.gs.prolog.tri_strip_adj_fix)
                return true;

        union si_shader_part_key prolog_key;
        memset(&prolog_key, 0, sizeof(prolog_key));
        prolog_key.gs_prolog.states = shader->key.part.gs.prolog;

        shader->prolog2 = si_get_shader_part(sscreen, &sscreen->gs_prologs,
                                            PIPE_SHADER_GEOMETRY, true,
                                            &prolog_key, compiler, debug,
                                            si_build_gs_prolog_function,
                                            "Geometry Shader Prolog");
        return shader->prolog2 != NULL;
}

/**
 * Build the pixel shader prolog function. This handles:
 * - two-side color selection and interpolation
 * - overriding interpolation parameters for the API PS
 * - polygon stippling
 *
 * All preloaded SGPRs and VGPRs are passed through unmodified unless they are
 * overriden by other states. (e.g. per-sample interpolation)
 * Interpolated colors are stored after the preloaded VGPRs.
 */
static void si_build_ps_prolog_function(struct si_shader_context *ctx,
                                        union si_shader_part_key *key)
{
        struct si_function_info fninfo;
        LLVMValueRef ret, func;
        int num_returns, i, num_color_channels;

        assert(si_need_ps_prolog(key));

        si_init_function_info(&fninfo);

        /* Declare inputs. */
        for (i = 0; i < key->ps_prolog.num_input_sgprs; i++)
                add_arg(&fninfo, ARG_SGPR, ctx->i32);

        for (i = 0; i < key->ps_prolog.num_input_vgprs; i++)
                add_arg(&fninfo, ARG_VGPR, ctx->f32);

        /* Declare outputs (same as inputs + add colors if needed) */
        num_returns = fninfo.num_params;
        num_color_channels = util_bitcount(key->ps_prolog.colors_read);
        for (i = 0; i < num_color_channels; i++)
                fninfo.types[num_returns++] = ctx->f32;

        /* Create the function. */
        si_create_function(ctx, "ps_prolog", fninfo.types, num_returns,
                           &fninfo, 0);
        func = ctx->main_fn;

        /* Copy inputs to outputs. This should be no-op, as the registers match,
         * but it will prevent the compiler from overwriting them unintentionally.
         */
        ret = ctx->return_value;
        for (i = 0; i < fninfo.num_params; i++) {
                LLVMValueRef p = LLVMGetParam(func, i);
                ret = LLVMBuildInsertValue(ctx->ac.builder, ret, p, i, "");
        }

        /* Polygon stippling. */
        if (key->ps_prolog.states.poly_stipple) {
                /* POS_FIXED_PT is always last. */
                unsigned pos = key->ps_prolog.num_input_sgprs +
                               key->ps_prolog.num_input_vgprs - 1;
                LLVMValueRef list = si_prolog_get_rw_buffers(ctx);

                si_llvm_emit_polygon_stipple(ctx, list, pos);
        }

        if (key->ps_prolog.states.bc_optimize_for_persp ||
            key->ps_prolog.states.bc_optimize_for_linear) {
                unsigned i, base = key->ps_prolog.num_input_sgprs;
                LLVMValueRef center[2], centroid[2], tmp, bc_optimize;

                /* The shader should do: if (PRIM_MASK[31]) CENTROID = CENTER;
                 * The hw doesn't compute CENTROID if the whole wave only
                 * contains fully-covered quads.
                 *
                 * PRIM_MASK is after user SGPRs.
                 */
                bc_optimize = LLVMGetParam(func, SI_PS_NUM_USER_SGPR);
                bc_optimize = LLVMBuildLShr(ctx->ac.builder, bc_optimize,
                                            LLVMConstInt(ctx->i32, 31, 0), "");
                bc_optimize = LLVMBuildTrunc(ctx->ac.builder, bc_optimize,
                                             ctx->i1, "");

                if (key->ps_prolog.states.bc_optimize_for_persp) {
                        /* Read PERSP_CENTER. */
                        for (i = 0; i < 2; i++)
                                center[i] = LLVMGetParam(func, base + 2 + i);
                        /* Read PERSP_CENTROID. */
                        for (i = 0; i < 2; i++)
                                centroid[i] = LLVMGetParam(func, base + 4 + i);
                        /* Select PERSP_CENTROID. */
                        for (i = 0; i < 2; i++) {
                                tmp = LLVMBuildSelect(ctx->ac.builder, bc_optimize,
                                                      center[i], centroid[i], "");
                                ret = LLVMBuildInsertValue(ctx->ac.builder, ret,
                                                           tmp, base + 4 + i, "");
                        }
                }
                if (key->ps_prolog.states.bc_optimize_for_linear) {
                        /* Read LINEAR_CENTER. */
                        for (i = 0; i < 2; i++)
                                center[i] = LLVMGetParam(func, base + 8 + i);
                        /* Read LINEAR_CENTROID. */
                        for (i = 0; i < 2; i++)
                                centroid[i] = LLVMGetParam(func, base + 10 + i);
                        /* Select LINEAR_CENTROID. */
                        for (i = 0; i < 2; i++) {
                                tmp = LLVMBuildSelect(ctx->ac.builder, bc_optimize,
                                                      center[i], centroid[i], "");
                                ret = LLVMBuildInsertValue(ctx->ac.builder, ret,
                                                           tmp, base + 10 + i, "");
                        }
                }
        }

        /* Force per-sample interpolation. */
        if (key->ps_prolog.states.force_persp_sample_interp) {
                unsigned i, base = key->ps_prolog.num_input_sgprs;
                LLVMValueRef persp_sample[2];

                /* Read PERSP_SAMPLE. */
                for (i = 0; i < 2; i++)
                        persp_sample[i] = LLVMGetParam(func, base + i);
                /* Overwrite PERSP_CENTER. */
                for (i = 0; i < 2; i++)
                        ret = LLVMBuildInsertValue(ctx->ac.builder, ret,
                                                   persp_sample[i], base + 2 + i, "");
                /* Overwrite PERSP_CENTROID. */
                for (i = 0; i < 2; i++)
                        ret = LLVMBuildInsertValue(ctx->ac.builder, ret,
                                                   persp_sample[i], base + 4 + i, "");
        }
        if (key->ps_prolog.states.force_linear_sample_interp) {
                unsigned i, base = key->ps_prolog.num_input_sgprs;
                LLVMValueRef linear_sample[2];

                /* Read LINEAR_SAMPLE. */
                for (i = 0; i < 2; i++)
                        linear_sample[i] = LLVMGetParam(func, base + 6 + i);
                /* Overwrite LINEAR_CENTER. */
                for (i = 0; i < 2; i++)
                        ret = LLVMBuildInsertValue(ctx->ac.builder, ret,
                                                   linear_sample[i], base + 8 + i, "");
                /* Overwrite LINEAR_CENTROID. */
                for (i = 0; i < 2; i++)
                        ret = LLVMBuildInsertValue(ctx->ac.builder, ret,
                                                   linear_sample[i], base + 10 + i, "");
        }

        /* Force center interpolation. */
        if (key->ps_prolog.states.force_persp_center_interp) {
                unsigned i, base = key->ps_prolog.num_input_sgprs;
                LLVMValueRef persp_center[2];

                /* Read PERSP_CENTER. */
                for (i = 0; i < 2; i++)
                        persp_center[i] = LLVMGetParam(func, base + 2 + i);
                /* Overwrite PERSP_SAMPLE. */
                for (i = 0; i < 2; i++)
                        ret = LLVMBuildInsertValue(ctx->ac.builder, ret,
                                                   persp_center[i], base + i, "");
                /* Overwrite PERSP_CENTROID. */
                for (i = 0; i < 2; i++)
                        ret = LLVMBuildInsertValue(ctx->ac.builder, ret,
                                                   persp_center[i], base + 4 + i, "");
        }
        if (key->ps_prolog.states.force_linear_center_interp) {
                unsigned i, base = key->ps_prolog.num_input_sgprs;
                LLVMValueRef linear_center[2];

                /* Read LINEAR_CENTER. */
                for (i = 0; i < 2; i++)
                        linear_center[i] = LLVMGetParam(func, base + 8 + i);
                /* Overwrite LINEAR_SAMPLE. */
                for (i = 0; i < 2; i++)
                        ret = LLVMBuildInsertValue(ctx->ac.builder, ret,
                                                   linear_center[i], base + 6 + i, "");
                /* Overwrite LINEAR_CENTROID. */
                for (i = 0; i < 2; i++)
                        ret = LLVMBuildInsertValue(ctx->ac.builder, ret,
                                                   linear_center[i], base + 10 + i, "");
        }

        /* Interpolate colors. */
        unsigned color_out_idx = 0;
        for (i = 0; i < 2; i++) {
                unsigned writemask = (key->ps_prolog.colors_read >> (i * 4)) & 0xf;
                unsigned face_vgpr = key->ps_prolog.num_input_sgprs +
                                     key->ps_prolog.face_vgpr_index;
                LLVMValueRef interp[2], color[4];
                LLVMValueRef interp_ij = NULL, prim_mask = NULL, face = NULL;

                if (!writemask)
                        continue;

                /* If the interpolation qualifier is not CONSTANT (-1). */
                if (key->ps_prolog.color_interp_vgpr_index[i] != -1) {
                        unsigned interp_vgpr = key->ps_prolog.num_input_sgprs +
                                               key->ps_prolog.color_interp_vgpr_index[i];

                        /* Get the (i,j) updated by bc_optimize handling. */
                        interp[0] = LLVMBuildExtractValue(ctx->ac.builder, ret,
                                                          interp_vgpr, "");
                        interp[1] = LLVMBuildExtractValue(ctx->ac.builder, ret,
                                                          interp_vgpr + 1, "");
                        interp_ij = ac_build_gather_values(&ctx->ac, interp, 2);
                }

                /* Use the absolute location of the input. */
                prim_mask = LLVMGetParam(func, SI_PS_NUM_USER_SGPR);

                if (key->ps_prolog.states.color_two_side) {
                        face = LLVMGetParam(func, face_vgpr);
                        face = ac_to_integer(&ctx->ac, face);
                }

                interp_fs_input(ctx,
                                key->ps_prolog.color_attr_index[i],
                                TGSI_SEMANTIC_COLOR, i,
                                key->ps_prolog.num_interp_inputs,
                                key->ps_prolog.colors_read, interp_ij,
                                prim_mask, face, color);

                while (writemask) {
                        unsigned chan = u_bit_scan(&writemask);
                        ret = LLVMBuildInsertValue(ctx->ac.builder, ret, color[chan],
                                                   fninfo.num_params + color_out_idx++, "");
                }
        }

        /* Section 15.2.2 (Shader Inputs) of the OpenGL 4.5 (Core Profile) spec
         * says:
         *
         *    "When per-sample shading is active due to the use of a fragment
         *     input qualified by sample or due to the use of the gl_SampleID
         *     or gl_SamplePosition variables, only the bit for the current
         *     sample is set in gl_SampleMaskIn. When state specifies multiple
         *     fragment shader invocations for a given fragment, the sample
         *     mask for any single fragment shader invocation may specify a
         *     subset of the covered samples for the fragment. In this case,
         *     the bit corresponding to each covered sample will be set in
         *     exactly one fragment shader invocation."
         *
         * The samplemask loaded by hardware is always the coverage of the
         * entire pixel/fragment, so mask bits out based on the sample ID.
         */
        if (key->ps_prolog.states.samplemask_log_ps_iter) {
                /* The bit pattern matches that used by fixed function fragment
                 * processing. */
                static const uint16_t ps_iter_masks[] = {
                        0xffff, /* not used */
                        0x5555,
                        0x1111,
                        0x0101,
                        0x0001,
                };
                assert(key->ps_prolog.states.samplemask_log_ps_iter < ARRAY_SIZE(ps_iter_masks));

                uint32_t ps_iter_mask = ps_iter_masks[key->ps_prolog.states.samplemask_log_ps_iter];
                unsigned ancillary_vgpr = key->ps_prolog.num_input_sgprs +
                                          key->ps_prolog.ancillary_vgpr_index;
                LLVMValueRef sampleid = si_unpack_param(ctx, ancillary_vgpr, 8, 4);
                LLVMValueRef samplemask = LLVMGetParam(func, ancillary_vgpr + 1);

                samplemask = ac_to_integer(&ctx->ac, samplemask);
                samplemask = LLVMBuildAnd(
                        ctx->ac.builder,
                        samplemask,
                        LLVMBuildShl(ctx->ac.builder,
                                     LLVMConstInt(ctx->i32, ps_iter_mask, false),
                                     sampleid, ""),
                        "");
                samplemask = ac_to_float(&ctx->ac, samplemask);

                ret = LLVMBuildInsertValue(ctx->ac.builder, ret, samplemask,
                                           ancillary_vgpr + 1, "");
        }

        /* Tell LLVM to insert WQM instruction sequence when needed. */
        if (key->ps_prolog.wqm) {
                LLVMAddTargetDependentFunctionAttr(func,
                                                   "amdgpu-ps-wqm-outputs", "");
        }

        si_llvm_build_ret(ctx, ret);
}

/**
 * Build the pixel shader epilog function. This handles everything that must be
 * emulated for pixel shader exports. (alpha-test, format conversions, etc)
 */
static void si_build_ps_epilog_function(struct si_shader_context *ctx,
                                        union si_shader_part_key *key)
{
        struct lp_build_tgsi_context *bld_base = &ctx->bld_base;
        struct si_function_info fninfo;
        LLVMValueRef depth = NULL, stencil = NULL, samplemask = NULL;
        int i;
        struct si_ps_exports exp = {};

        si_init_function_info(&fninfo);

        /* Declare input SGPRs. */
        ctx->param_rw_buffers = add_arg(&fninfo, ARG_SGPR, ctx->ac.intptr);
        ctx->param_bindless_samplers_and_images = add_arg(&fninfo, ARG_SGPR, ctx->ac.intptr);
        ctx->param_const_and_shader_buffers = add_arg(&fninfo, ARG_SGPR, ctx->ac.intptr);
        ctx->param_samplers_and_images = add_arg(&fninfo, ARG_SGPR, ctx->ac.intptr);
        add_arg_checked(&fninfo, ARG_SGPR, ctx->f32, SI_PARAM_ALPHA_REF);

        /* Declare input VGPRs. */
        unsigned required_num_params =
                     fninfo.num_sgpr_params +
                     util_bitcount(key->ps_epilog.colors_written) * 4 +
                     key->ps_epilog.writes_z +
                     key->ps_epilog.writes_stencil +
                     key->ps_epilog.writes_samplemask;

        required_num_params = MAX2(required_num_params,
                                   fninfo.num_sgpr_params + PS_EPILOG_SAMPLEMASK_MIN_LOC + 1);

        while (fninfo.num_params < required_num_params)
                add_arg(&fninfo, ARG_VGPR, ctx->f32);

        /* Create the function. */
        si_create_function(ctx, "ps_epilog", NULL, 0, &fninfo, 0);
        /* Disable elimination of unused inputs. */
        ac_llvm_add_target_dep_function_attr(ctx->main_fn,
                                             "InitialPSInputAddr", 0xffffff);

        /* Process colors. */
        unsigned vgpr = fninfo.num_sgpr_params;
        unsigned colors_written = key->ps_epilog.colors_written;
        int last_color_export = -1;

        /* Find the last color export. */
        if (!key->ps_epilog.writes_z &&
            !key->ps_epilog.writes_stencil &&
            !key->ps_epilog.writes_samplemask) {
                unsigned spi_format = key->ps_epilog.states.spi_shader_col_format;

                /* If last_cbuf > 0, FS_COLOR0_WRITES_ALL_CBUFS is true. */
                if (colors_written == 0x1 && key->ps_epilog.states.last_cbuf > 0) {
                        /* Just set this if any of the colorbuffers are enabled. */
                        if (spi_format &
                            ((1ull << (4 * (key->ps_epilog.states.last_cbuf + 1))) - 1))
                                last_color_export = 0;
                } else {
                        for (i = 0; i < 8; i++)
                                if (colors_written & (1 << i) &&
                                    (spi_format >> (i * 4)) & 0xf)
                                        last_color_export = i;
                }
        }

        while (colors_written) {
                LLVMValueRef color[4];
                int mrt = u_bit_scan(&colors_written);

                for (i = 0; i < 4; i++)
                        color[i] = LLVMGetParam(ctx->main_fn, vgpr++);

                si_export_mrt_color(bld_base, color, mrt,
                                    fninfo.num_params - 1,
                                    mrt == last_color_export, &exp);
        }

        /* Process depth, stencil, samplemask. */
        if (key->ps_epilog.writes_z)
                depth = LLVMGetParam(ctx->main_fn, vgpr++);
        if (key->ps_epilog.writes_stencil)
                stencil = LLVMGetParam(ctx->main_fn, vgpr++);
        if (key->ps_epilog.writes_samplemask)
                samplemask = LLVMGetParam(ctx->main_fn, vgpr++);

        if (depth || stencil || samplemask)
                si_export_mrt_z(bld_base, depth, stencil, samplemask, &exp);
        else if (last_color_export == -1)
                ac_build_export_null(&ctx->ac);

        if (exp.num)
                si_emit_ps_exports(ctx, &exp);

        /* Compile. */
        LLVMBuildRetVoid(ctx->ac.builder);
}

/**
 * Select and compile (or reuse) pixel shader parts (prolog & epilog).
 */
static bool si_shader_select_ps_parts(struct si_screen *sscreen,
                                      struct ac_llvm_compiler *compiler,
                                      struct si_shader *shader,
                                      struct pipe_debug_callback *debug)
{
        union si_shader_part_key prolog_key;
        union si_shader_part_key epilog_key;

        /* Get the prolog. */
        si_get_ps_prolog_key(shader, &prolog_key, true);

        /* The prolog is a no-op if these aren't set. */
        if (si_need_ps_prolog(&prolog_key)) {
                shader->prolog =
                        si_get_shader_part(sscreen, &sscreen->ps_prologs,
                                           PIPE_SHADER_FRAGMENT, true,
                                           &prolog_key, compiler, debug,
                                           si_build_ps_prolog_function,
                                           "Fragment Shader Prolog");
                if (!shader->prolog)
                        return false;
        }

        /* Get the epilog. */
        si_get_ps_epilog_key(shader, &epilog_key);

        shader->epilog =
                si_get_shader_part(sscreen, &sscreen->ps_epilogs,
                                   PIPE_SHADER_FRAGMENT, false,
                                   &epilog_key, compiler, debug,
                                   si_build_ps_epilog_function,
                                   "Fragment Shader Epilog");
        if (!shader->epilog)
                return false;

        /* Enable POS_FIXED_PT if polygon stippling is enabled. */
        if (shader->key.part.ps.prolog.poly_stipple) {
                shader->config.spi_ps_input_ena |= S_0286CC_POS_FIXED_PT_ENA(1);
                assert(G_0286CC_POS_FIXED_PT_ENA(shader->config.spi_ps_input_addr));
        }

        /* Set up the enable bits for per-sample shading if needed. */
        if (shader->key.part.ps.prolog.force_persp_sample_interp &&
            (G_0286CC_PERSP_CENTER_ENA(shader->config.spi_ps_input_ena) ||
             G_0286CC_PERSP_CENTROID_ENA(shader->config.spi_ps_input_ena))) {
                shader->config.spi_ps_input_ena &= C_0286CC_PERSP_CENTER_ENA;
                shader->config.spi_ps_input_ena &= C_0286CC_PERSP_CENTROID_ENA;
                shader->config.spi_ps_input_ena |= S_0286CC_PERSP_SAMPLE_ENA(1);
        }
        if (shader->key.part.ps.prolog.force_linear_sample_interp &&
            (G_0286CC_LINEAR_CENTER_ENA(shader->config.spi_ps_input_ena) ||
             G_0286CC_LINEAR_CENTROID_ENA(shader->config.spi_ps_input_ena))) {
                shader->config.spi_ps_input_ena &= C_0286CC_LINEAR_CENTER_ENA;
                shader->config.spi_ps_input_ena &= C_0286CC_LINEAR_CENTROID_ENA;
                shader->config.spi_ps_input_ena |= S_0286CC_LINEAR_SAMPLE_ENA(1);
        }
        if (shader->key.part.ps.prolog.force_persp_center_interp &&
            (G_0286CC_PERSP_SAMPLE_ENA(shader->config.spi_ps_input_ena) ||
             G_0286CC_PERSP_CENTROID_ENA(shader->config.spi_ps_input_ena))) {
                shader->config.spi_ps_input_ena &= C_0286CC_PERSP_SAMPLE_ENA;
                shader->config.spi_ps_input_ena &= C_0286CC_PERSP_CENTROID_ENA;
                shader->config.spi_ps_input_ena |= S_0286CC_PERSP_CENTER_ENA(1);
        }
        if (shader->key.part.ps.prolog.force_linear_center_interp &&
            (G_0286CC_LINEAR_SAMPLE_ENA(shader->config.spi_ps_input_ena) ||
             G_0286CC_LINEAR_CENTROID_ENA(shader->config.spi_ps_input_ena))) {
                shader->config.spi_ps_input_ena &= C_0286CC_LINEAR_SAMPLE_ENA;
                shader->config.spi_ps_input_ena &= C_0286CC_LINEAR_CENTROID_ENA;
                shader->config.spi_ps_input_ena |= S_0286CC_LINEAR_CENTER_ENA(1);
        }

        /* POW_W_FLOAT requires that one of the perspective weights is enabled. */
        if (G_0286CC_POS_W_FLOAT_ENA(shader->config.spi_ps_input_ena) &&
            !(shader->config.spi_ps_input_ena & 0xf)) {
                shader->config.spi_ps_input_ena |= S_0286CC_PERSP_CENTER_ENA(1);
                assert(G_0286CC_PERSP_CENTER_ENA(shader->config.spi_ps_input_addr));
        }

        /* At least one pair of interpolation weights must be enabled. */
        if (!(shader->config.spi_ps_input_ena & 0x7f)) {
                shader->config.spi_ps_input_ena |= S_0286CC_LINEAR_CENTER_ENA(1);
                assert(G_0286CC_LINEAR_CENTER_ENA(shader->config.spi_ps_input_addr));
        }

        /* Samplemask fixup requires the sample ID. */
        if (shader->key.part.ps.prolog.samplemask_log_ps_iter) {
                shader->config.spi_ps_input_ena |= S_0286CC_ANCILLARY_ENA(1);
                assert(G_0286CC_ANCILLARY_ENA(shader->config.spi_ps_input_addr));
        }

        /* The sample mask input is always enabled, because the API shader always
         * passes it through to the epilog. Disable it here if it's unused.
         */
        if (!shader->key.part.ps.epilog.poly_line_smoothing &&
            !shader->selector->info.reads_samplemask)
                shader->config.spi_ps_input_ena &= C_0286CC_SAMPLE_COVERAGE_ENA;

        return true;
}

void si_multiwave_lds_size_workaround(struct si_screen *sscreen,
                                      unsigned *lds_size)
{
        /* If tessellation is all offchip and on-chip GS isn't used, this
         * workaround is not needed.
         */
        return;

        /* SPI barrier management bug:
         *   Make sure we have at least 4k of LDS in use to avoid the bug.
         *   It applies to workgroup sizes of more than one wavefront.
         */
        if (sscreen->info.family == CHIP_BONAIRE ||
            sscreen->info.family == CHIP_KABINI ||
            sscreen->info.family == CHIP_MULLINS)
                *lds_size = MAX2(*lds_size, 8);
}

static void si_fix_resource_usage(struct si_screen *sscreen,
                                  struct si_shader *shader)
{
        unsigned min_sgprs = shader->info.num_input_sgprs + 2; /* VCC */

        shader->config.num_sgprs = MAX2(shader->config.num_sgprs, min_sgprs);

        if (shader->selector->type == PIPE_SHADER_COMPUTE &&
            si_get_max_workgroup_size(shader) > 64) {
                si_multiwave_lds_size_workaround(sscreen,
                                                 &shader->config.lds_size);
        }
}

int si_shader_create(struct si_screen *sscreen, struct ac_llvm_compiler *compiler,
                     struct si_shader *shader,
                     struct pipe_debug_callback *debug)
{
        struct si_shader_selector *sel = shader->selector;
        struct si_shader *mainp = *si_get_main_shader_part(sel, &shader->key);
        int r;

        /* LS, ES, VS are compiled on demand if the main part hasn't been
         * compiled for that stage.
         *
         * Vertex shaders are compiled on demand when a vertex fetch
         * workaround must be applied.
         */
        if (shader->is_monolithic) {
                /* Monolithic shader (compiled as a whole, has many variants,
                 * may take a long time to compile).
                 */
                r = si_compile_tgsi_shader(sscreen, compiler, shader, debug);
                if (r)
                        return r;
        } else {
                /* The shader consists of several parts:
                 *
                 * - the middle part is the user shader, it has 1 variant only
                 *   and it was compiled during the creation of the shader
                 *   selector
                 * - the prolog part is inserted at the beginning
                 * - the epilog part is inserted at the end
                 *
                 * The prolog and epilog have many (but simple) variants.
                 *
                 * Starting with gfx9, geometry and tessellation control
                 * shaders also contain the prolog and user shader parts of
                 * the previous shader stage.
                 */

                if (!mainp)
                        return -1;

                /* Copy the compiled TGSI shader data over. */
                shader->is_binary_shared = true;
                shader->binary = mainp->binary;
                shader->config = mainp->config;
                shader->info.num_input_sgprs = mainp->info.num_input_sgprs;
                shader->info.num_input_vgprs = mainp->info.num_input_vgprs;
                shader->info.face_vgpr_index = mainp->info.face_vgpr_index;
                shader->info.ancillary_vgpr_index = mainp->info.ancillary_vgpr_index;
                memcpy(shader->info.vs_output_param_offset,
                       mainp->info.vs_output_param_offset,
                       sizeof(mainp->info.vs_output_param_offset));
                shader->info.uses_instanceid = mainp->info.uses_instanceid;
                shader->info.nr_pos_exports = mainp->info.nr_pos_exports;
                shader->info.nr_param_exports = mainp->info.nr_param_exports;

                /* Select prologs and/or epilogs. */
                switch (sel->type) {
                case PIPE_SHADER_VERTEX:
                        if (!si_shader_select_vs_parts(sscreen, compiler, shader, debug))
                                return -1;
                        break;
                case PIPE_SHADER_TESS_CTRL:
                        if (!si_shader_select_tcs_parts(sscreen, compiler, shader, debug))
                                return -1;
                        break;
                case PIPE_SHADER_TESS_EVAL:
                        break;
                case PIPE_SHADER_GEOMETRY:
                        if (!si_shader_select_gs_parts(sscreen, compiler, shader, debug))
                                return -1;
                        break;
                case PIPE_SHADER_FRAGMENT:
                        if (!si_shader_select_ps_parts(sscreen, compiler, shader, debug))
                                return -1;

                        /* Make sure we have at least as many VGPRs as there
                         * are allocated inputs.
                         */
                        shader->config.num_vgprs = MAX2(shader->config.num_vgprs,
                                                        shader->info.num_input_vgprs);
                        break;
                }

                /* Update SGPR and VGPR counts. */
                if (shader->prolog) {
                        shader->config.num_sgprs = MAX2(shader->config.num_sgprs,
                                                        shader->prolog->config.num_sgprs);
                        shader->config.num_vgprs = MAX2(shader->config.num_vgprs,
                                                        shader->prolog->config.num_vgprs);
                }
                if (shader->previous_stage) {
                        shader->config.num_sgprs = MAX2(shader->config.num_sgprs,
                                                        shader->previous_stage->config.num_sgprs);
                        shader->config.num_vgprs = MAX2(shader->config.num_vgprs,
                                                        shader->previous_stage->config.num_vgprs);
                        shader->config.spilled_sgprs =
                                MAX2(shader->config.spilled_sgprs,
                                     shader->previous_stage->config.spilled_sgprs);
                        shader->config.spilled_vgprs =
                                MAX2(shader->config.spilled_vgprs,
                                     shader->previous_stage->config.spilled_vgprs);
                        shader->config.private_mem_vgprs =
                                MAX2(shader->config.private_mem_vgprs,
                                     shader->previous_stage->config.private_mem_vgprs);
                        shader->config.scratch_bytes_per_wave =
                                MAX2(shader->config.scratch_bytes_per_wave,
                                     shader->previous_stage->config.scratch_bytes_per_wave);
                        shader->info.uses_instanceid |=
                                shader->previous_stage->info.uses_instanceid;
                }
                if (shader->prolog2) {
                        shader->config.num_sgprs = MAX2(shader->config.num_sgprs,
                                                        shader->prolog2->config.num_sgprs);
                        shader->config.num_vgprs = MAX2(shader->config.num_vgprs,
                                                        shader->prolog2->config.num_vgprs);
                }
                if (shader->epilog) {
                        shader->config.num_sgprs = MAX2(shader->config.num_sgprs,
                                                        shader->epilog->config.num_sgprs);
                        shader->config.num_vgprs = MAX2(shader->config.num_vgprs,
                                                        shader->epilog->config.num_vgprs);
                }
                si_calculate_max_simd_waves(shader);
        }

        si_fix_resource_usage(sscreen, shader);
        si_shader_dump(sscreen, shader, debug, sel->info.processor,
                       stderr, true);

        /* Upload. */
        r = si_shader_binary_upload(sscreen, shader);
        if (r) {
                fprintf(stderr, "LLVM failed to upload shader\n");
                return r;
        }

        return 0;
}

void si_shader_destroy(struct si_shader *shader)
{
        if (shader->scratch_bo)
                si_resource_reference(&shader->scratch_bo, NULL);

        si_resource_reference(&shader->bo, NULL);

        if (!shader->is_binary_shared)
                ac_shader_binary_clean(&shader->binary);

        free(shader->shader_log);
}