src/mesa/drivers/dri/i965/brw_nir.c

   1 /*
   2  * Copyright © 2014 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include "brw_nir.h"
  25 #include "glsl/glsl_parser_extras.h"
  26 #include "glsl/nir/glsl_to_nir.h"
  27 #include "program/prog_to_nir.h"
  28
  29 static void
  30 nir_optimize(nir_shader *nir, bool is_scalar)
  31 {
  32    bool progress;
  33    do {
  34       progress = false;
  35       nir_lower_vars_to_ssa(nir);
  36       nir_validate_shader(nir);
  37
  38       if (is_scalar) {
  39          nir_lower_alu_to_scalar(nir);
  40          nir_validate_shader(nir);
  41       }
  42
  43       progress |= nir_copy_prop(nir);
  44       nir_validate_shader(nir);
  45       nir_lower_phis_to_scalar(nir);
  46       nir_validate_shader(nir);
  47       progress |= nir_copy_prop(nir);
  48       nir_validate_shader(nir);
  49       progress |= nir_opt_dce(nir);
  50       nir_validate_shader(nir);
  51       progress |= nir_opt_cse(nir);
  52       nir_validate_shader(nir);
  53       progress |= nir_opt_peephole_select(nir);
  54       nir_validate_shader(nir);
  55       progress |= nir_opt_algebraic(nir);
  56       nir_validate_shader(nir);
  57       progress |= nir_opt_constant_folding(nir);
  58       nir_validate_shader(nir);
  59       progress |= nir_opt_remove_phis(nir);
  60       nir_validate_shader(nir);
  61    } while (progress);
  62 }
  63
  64 nir_shader *
  65 brw_create_nir(struct brw_context *brw,
  66                const struct gl_shader_program *shader_prog,
  67                const struct gl_program *prog,
  68                gl_shader_stage stage,
  69                bool is_scalar)
  70 {
  71    struct gl_context *ctx = &brw->ctx;
  72    const nir_shader_compiler_options *options =
  73       ctx->Const.ShaderCompilerOptions[stage].NirOptions;
  74    struct gl_shader *shader = shader_prog ? shader_prog->_LinkedShaders[stage] : NULL;
  75    bool debug_enabled = INTEL_DEBUG & intel_debug_flag_for_shader_stage(stage);
  76    nir_shader *nir;
  77
  78    /* First, lower the GLSL IR or Mesa IR to NIR */
  79    if (shader_prog) {
  80       nir = glsl_to_nir(shader, options);
  81    } else {
  82       nir = prog_to_nir(prog, options);
  83       nir_convert_to_ssa(nir); /* turn registers into SSA */
  84    }
  85    nir_validate_shader(nir);
  86
  87    nir_lower_global_vars_to_local(nir);
  88    nir_validate_shader(nir);
  89
  90    nir_lower_tex_projector(nir);
  91    nir_validate_shader(nir);
  92
  93    nir_normalize_cubemap_coords(nir);
  94    nir_validate_shader(nir);
  95
  96    nir_split_var_copies(nir);
  97    nir_validate_shader(nir);
  98
  99    nir_optimize(nir, is_scalar);
 100
 101    /* Lower a bunch of stuff */
 102    nir_lower_var_copies(nir);
 103    nir_validate_shader(nir);
 104
 105    /* Get rid of split copies */
 106    nir_optimize(nir, is_scalar);
 107
 108    if (is_scalar) {
 109       nir_assign_var_locations_direct_first(nir, &nir->uniforms,
 110                                             &nir->num_direct_uniforms,
 111                                             &nir->num_uniforms,
 112                                             is_scalar);
 113       nir_assign_var_locations(&nir->outputs, &nir->num_outputs, is_scalar);
 114    } else {
 115       nir_assign_var_locations(&nir->uniforms,
 116                                &nir->num_uniforms,
 117                                is_scalar);
 118
 119       foreach_list_typed(nir_variable, var, node, &nir->outputs)
 120          var->data.driver_location = var->data.location;
 121    }
 122    nir_assign_var_locations(&nir->inputs, &nir->num_inputs, is_scalar);
 123
 124    nir_lower_io(nir, is_scalar);
 125
 126    nir_validate_shader(nir);
 127
 128    nir_remove_dead_variables(nir);
 129    nir_validate_shader(nir);
 130
 131    if (shader_prog) {
 132       nir_lower_samplers(nir, shader_prog, stage);
 133       nir_validate_shader(nir);
 134    }
 135
 136    nir_lower_system_values(nir);
 137    nir_validate_shader(nir);
 138
 139    nir_lower_atomics(nir);
 140    nir_validate_shader(nir);
 141
 142    nir_optimize(nir, is_scalar);
 143
 144    if (brw->gen >= 6) {
 145       /* Try and fuse multiply-adds */
 146       nir_opt_peephole_ffma(nir);
 147       nir_validate_shader(nir);
 148    }
 149
 150    nir_opt_algebraic_late(nir);
 151    nir_validate_shader(nir);
 152
 153    nir_lower_locals_to_regs(nir);
 154    nir_validate_shader(nir);
 155
 156    nir_lower_to_source_mods(nir);
 157    nir_validate_shader(nir);
 158    nir_copy_prop(nir);
 159    nir_validate_shader(nir);
 160    nir_opt_dce(nir);
 161    nir_validate_shader(nir);
 162
 163    if (unlikely(debug_enabled)) {
 164       /* Re-index SSA defs so we print more sensible numbers. */
 165       nir_foreach_overload(nir, overload) {
 166          if (overload->impl)
 167             nir_index_ssa_defs(overload->impl);
 168       }
 169
 170       fprintf(stderr, "NIR (SSA form) for %s shader:\n",
 171               _mesa_shader_stage_to_string(stage));
 172       nir_print_shader(nir, stderr);
 173    }
 174
 175    nir_convert_from_ssa(nir, is_scalar);
 176    nir_validate_shader(nir);
 177
 178    /* This is the last pass we run before we start emitting stuff.  It
 179     * determines when we need to insert boolean resolves on Gen <= 5.  We
 180     * run it last because it stashes data in instr->pass_flags and we don't
 181     * want that to be squashed by other NIR passes.
 182     */
 183    if (brw->gen <= 5)
 184       brw_nir_analyze_boolean_resolves(nir);
 185
 186    nir_sweep(nir);
 187
 188    if (unlikely(debug_enabled)) {
 189       fprintf(stderr, "NIR (final form) for %s shader:\n",
 190               _mesa_shader_stage_to_string(stage));
 191       nir_print_shader(nir, stderr);
 192    }
 193
 194    return nir;
 195 }
 196
 197 enum brw_reg_type
 198 brw_type_for_nir_type(nir_alu_type type)
 199 {
 200    switch (type) {
 201    case nir_type_unsigned:
 202       return BRW_REGISTER_TYPE_UD;
 203    case nir_type_bool:
 204    case nir_type_int:
 205       return BRW_REGISTER_TYPE_D;
 206    case nir_type_float:
 207       return BRW_REGISTER_TYPE_F;
 208    default:
 209       unreachable("unknown type");
 210    }
 211
 212    return BRW_REGISTER_TYPE_F;
 213 }