+++ /dev/null
-/*
- * Copyright © 2014 Intel Corporation
- *
- * 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
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * 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 NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS 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.
- *
- * Authors:
- * Connor Abbott (cwabbott0@gmail.com)
- *
- */
-
-/*
- * This lowering pass converts references to variables with loads/stores to
- * registers or inputs/outputs. We assume that structure splitting has already
- * been run, or else structures with indirect references can't be split. We
- * also assume that this pass will be consumed by a scalar backend, so we pack
- * things more tightly.
- */
-
-#include "nir.h"
-
-static unsigned
-type_size(const struct glsl_type *type)
-{
- unsigned int size, i;
-
- switch (glsl_get_base_type(type)) {
- case GLSL_TYPE_UINT:
- case GLSL_TYPE_INT:
- case GLSL_TYPE_FLOAT:
- case GLSL_TYPE_BOOL:
- return glsl_get_components(type);
- case GLSL_TYPE_ARRAY:
- return type_size(glsl_get_array_element(type)) * glsl_get_length(type);
- case GLSL_TYPE_STRUCT:
- size = 0;
- for (i = 0; i < glsl_get_length(type); i++) {
- size += type_size(glsl_get_struct_field(type, i));
- }
- return size;
- case GLSL_TYPE_SAMPLER:
- return 0;
- case GLSL_TYPE_ATOMIC_UINT:
- return 0;
- case GLSL_TYPE_INTERFACE:
- return 0;
- case GLSL_TYPE_IMAGE:
- return 0;
- case GLSL_TYPE_VOID:
- case GLSL_TYPE_ERROR:
- unreachable("not reached");
- }
-
- return 0;
-}
-
-/*
- * for inputs, outputs, and uniforms, assigns starting locations for variables
- */
-
-static void
-assign_var_locations(struct hash_table *ht, unsigned *size)
-{
- unsigned location = 0;
-
- struct hash_entry *entry;
- hash_table_foreach(ht, entry) {
- nir_variable *var = (nir_variable *) entry->data;
-
- /*
- * UBO's have their own address spaces, so don't count them towards the
- * number of global uniforms
- */
- if (var->data.mode == nir_var_uniform && var->interface_type != NULL)
- continue;
-
- var->data.driver_location = location;
- location += type_size(var->type);
- }
-
- *size = location;
-}
-
-static void
-assign_var_locations_shader(nir_shader *shader)
-{
- assign_var_locations(shader->inputs, &shader->num_inputs);
- assign_var_locations(shader->outputs, &shader->num_outputs);
- assign_var_locations(shader->uniforms, &shader->num_uniforms);
-}
-
-static void
-init_reg(nir_variable *var, nir_register *reg, struct hash_table *ht,
- bool add_names)
-{
- if (!glsl_type_is_scalar(var->type) &&
- !glsl_type_is_vector(var->type)) {
- reg->is_packed = true;
- reg->num_components = 1;
- reg->num_array_elems = type_size(var->type);
- } else {
- reg->num_components = glsl_get_components(var->type);
- }
- if (add_names)
- reg->name = ralloc_strdup(reg, var->name);
- _mesa_hash_table_insert(ht, var, reg);
-}
-
-static struct hash_table *
-init_var_ht(nir_shader *shader, bool lower_globals, bool lower_io,
- bool add_names)
-{
- struct hash_table *ht = _mesa_hash_table_create(NULL,
- _mesa_hash_pointer,
- _mesa_key_pointer_equal);
-
- if (lower_globals) {
- foreach_list_typed(nir_variable, var, node, &shader->globals) {
- nir_register *reg = nir_global_reg_create(shader);
- init_reg(var, reg, ht, add_names);
- }
- }
-
- if (lower_io) {
- struct hash_entry *entry;
- hash_table_foreach(shader->outputs, entry) {
- nir_variable *var = (nir_variable *) entry->data;
- nir_register *reg = nir_global_reg_create(shader);
- init_reg(var, reg, ht, add_names);
- }
- }
-
- nir_foreach_overload(shader, overload) {
- if (overload->impl) {
- nir_function_impl *impl = overload->impl;
-
- foreach_list_typed(nir_variable, var, node, &impl->locals) {
- nir_register *reg = nir_local_reg_create(impl);
- init_reg(var, reg, ht, add_names);
- }
- }
- }
-
- return ht;
-}
-
-static bool
-deref_has_indirect(nir_deref_var *deref_var)
-{
- nir_deref *deref = &deref_var->deref;
-
- while (deref->child != NULL) {
- deref = deref->child;
- if (deref->deref_type == nir_deref_type_array) {
- nir_deref_array *deref_array = nir_deref_as_array(deref);
- if (deref_array->deref_array_type == nir_deref_array_type_indirect)
- return true;
- }
- }
-
- return false;
-}
-
-static unsigned
-get_deref_offset(nir_deref_var *deref_var, nir_instr *instr,
- nir_function_impl *impl, bool native_integers,
- nir_src *indirect)
-{
- void *mem_ctx = ralloc_parent(instr);
-
- bool first_indirect = true;
-
- unsigned base_offset = 0;
- nir_deref *deref = &deref_var->deref;
- while (deref->child != NULL) {
- const struct glsl_type *parent_type = deref->type;
- deref = deref->child;
-
- if (deref->deref_type == nir_deref_type_array) {
- nir_deref_array *deref_array = nir_deref_as_array(deref);
- unsigned size = type_size(deref->type);
-
- base_offset += size * deref_array->base_offset;
-
- if (deref_array->deref_array_type == nir_deref_array_type_indirect) {
- nir_src src;
- if (size == 1) {
- src = deref_array->indirect;
- } else {
- /* temp1 = size * deref_array->indirect */
-
- nir_register *const_reg = nir_local_reg_create(impl);
- const_reg->num_components = 1;
-
- nir_load_const_instr *load_const =
- nir_load_const_instr_create(mem_ctx);
- load_const->dest.reg.reg = const_reg;
- load_const->num_components = 1;
- load_const->value.u[0] = size;
- nir_instr_insert_before(instr, &load_const->instr);
-
- nir_register *reg = nir_local_reg_create(impl);
- reg->num_components = 1;
-
- nir_op op;
- if (native_integers)
- op = nir_op_imul;
- else
- op = nir_op_fmul;
- nir_alu_instr *mul_instr = nir_alu_instr_create(mem_ctx, op);
- mul_instr->dest.write_mask = 1;
- mul_instr->dest.dest.reg.reg = reg;
- mul_instr->src[0].src = deref_array->indirect;
- mul_instr->src[1].src.reg.reg = const_reg;
- nir_instr_insert_before(instr, &mul_instr->instr);
-
- src.is_ssa = false;
- src.reg.reg = reg;
- src.reg.base_offset = 0;
- src.reg.indirect = NULL;
- }
-
- if (!first_indirect) {
- /* temp2 = indirect + temp1 */
-
- nir_register *reg = nir_local_reg_create(impl);
- reg->num_components = 1;
-
- nir_op op;
- if (native_integers)
- op = nir_op_iadd;
- else
- op = nir_op_fadd;
- nir_alu_instr *add_instr = nir_alu_instr_create(mem_ctx, op);
- add_instr->dest.write_mask = 1;
- add_instr->dest.dest.reg.reg = reg;
- add_instr->src[0].src = *indirect;
- add_instr->src[1].src = src;
- nir_instr_insert_before(instr, &add_instr->instr);
-
- src.is_ssa = false;
- src.reg.reg = reg;
- src.reg.base_offset = 0;
- src.reg.indirect = NULL;
- }
-
- /* indirect = tempX */
- *indirect = src;
- first_indirect = false;
- }
- } else {
- nir_deref_struct *deref_struct = nir_deref_as_struct(deref);
-
- for (unsigned i = 0; i < deref_struct->index; i++)
- base_offset += type_size(glsl_get_struct_field(parent_type, i));
- }
- }
-
- return base_offset;
-}
-
-/*
- * We cannot convert variables used in calls, so remove them from the hash
- * table.
- */
-
-static bool
-remove_call_vars_cb(nir_block *block, void *state)
-{
- struct hash_table *ht = (struct hash_table *) state;
-
- nir_foreach_instr(block, instr) {
- if (instr->type == nir_instr_type_call) {
- nir_call_instr *call = nir_instr_as_call(instr);
- if (call->return_deref) {
- struct hash_entry *entry =
- _mesa_hash_table_search(ht, call->return_deref->var);
- if (entry)
- _mesa_hash_table_remove(ht, entry);
- }
-
- for (unsigned i = 0; i < call->num_params; i++) {
- struct hash_entry *entry =
- _mesa_hash_table_search(ht, call->params[i]->var);
- if (entry)
- _mesa_hash_table_remove(ht, entry);
- }
- }
- }
-
- return true;
-}
-
-static void
-remove_local_vars(nir_function_impl *impl, struct hash_table *ht)
-{
- if (impl->return_var) {
- struct hash_entry *entry =
- _mesa_hash_table_search(ht, impl->return_var);
-
- if (entry)
- _mesa_hash_table_remove(ht, entry);
- }
-
- for (unsigned i = 0; i < impl->num_params; i++) {
- struct hash_entry *entry =
- _mesa_hash_table_search(ht, impl->params[i]);
- if (entry)
- _mesa_hash_table_remove(ht, entry);
- }
-
- nir_foreach_block(impl, remove_call_vars_cb, ht);
-}
-
-static void
-remove_local_vars_shader(nir_shader *shader, struct hash_table *ht)
-{
- nir_foreach_overload(shader, overload) {
- if (overload->impl)
- remove_local_vars(overload->impl, ht);
- }
-}
-
-static nir_deref *
-get_deref_tail(nir_deref *deref)
-{
- while (deref->child != NULL)
- deref = deref->child;
- return deref;
-}
-
-/* helper for reg_const_load which emits a single instruction */
-static void
-reg_const_load_single_instr(nir_reg_dest reg, nir_constant *constant,
- enum glsl_base_type base_type,
- unsigned num_components, unsigned offset,
- nir_function_impl *impl, void *mem_ctx)
-{
- nir_load_const_instr *instr = nir_load_const_instr_create(mem_ctx);
- instr->num_components = num_components;
- for (unsigned i = 0; i < num_components; i++) {
- switch (base_type) {
- case GLSL_TYPE_FLOAT:
- case GLSL_TYPE_INT:
- case GLSL_TYPE_UINT:
- instr->value.u[i] = constant->value.u[i + offset];
- break;
- case GLSL_TYPE_BOOL:
- instr->value.u[i] = constant->value.u[i + offset] ?
- NIR_TRUE : NIR_FALSE;
- break;
- default:
- unreachable("Invalid immediate type");
- }
- }
- instr->dest.reg = reg;
- instr->dest.reg.base_offset += offset;
-
- nir_instr_insert_before_cf_list(&impl->body, &instr->instr);
-}
-
-/* loads a constant value into a register */
-static void
-reg_const_load(nir_reg_dest reg, nir_constant *constant,
- const struct glsl_type *type, nir_function_impl *impl,
- void *mem_ctx)
-{
- unsigned offset = 0;
- const struct glsl_type *subtype;
- unsigned subtype_size;
-
- enum glsl_base_type base_type = glsl_get_base_type(type);
- switch (base_type) {
- case GLSL_TYPE_FLOAT:
- case GLSL_TYPE_INT:
- case GLSL_TYPE_UINT:
- case GLSL_TYPE_BOOL:
- if (glsl_type_is_matrix(type)) {
- for (unsigned i = 0; i < glsl_get_matrix_columns(type); i++) {
- reg_const_load_single_instr(reg, constant, base_type,
- glsl_get_vector_elements(type),
- i * glsl_get_vector_elements(type),
- impl, mem_ctx);
- }
- } else {
- reg_const_load_single_instr(reg, constant, base_type,
- glsl_get_vector_elements(type), 0,
- impl, mem_ctx);
- }
- break;
-
- case GLSL_TYPE_STRUCT:
- for (unsigned i = 0; i < glsl_get_length(type); i++) {
- const struct glsl_type *field = glsl_get_struct_field(type, i);
- nir_reg_dest new_reg = reg;
- new_reg.base_offset += offset;
- reg_const_load(new_reg, constant->elements[i], field, impl,
- mem_ctx);
- offset += type_size(field);
- }
- break;
-
- case GLSL_TYPE_ARRAY:
- subtype = glsl_get_array_element(type);
- subtype_size = type_size(subtype);
- for (unsigned i = 0; i < glsl_get_length(type); i++) {
- nir_reg_dest new_reg = reg;
- new_reg.base_offset += subtype_size * i;
- reg_const_load(new_reg, constant->elements[i], subtype, impl,
- mem_ctx);
- }
- break;
-
- default:
- assert(0);
- break;
- }
-}
-
-/* recursively emits a register <-> dereference block copy */
-static void
-var_reg_block_copy_impl(nir_reg_src reg, nir_deref_var *deref_head,
- nir_src *predicate, const struct glsl_type *type,
- nir_instr *after, bool var_dest, void *mem_ctx)
-{
- unsigned offset;
-
- switch (glsl_get_base_type(type)) {
- case GLSL_TYPE_FLOAT:
- case GLSL_TYPE_INT:
- case GLSL_TYPE_UINT:
- case GLSL_TYPE_BOOL:
- if (glsl_type_is_matrix(type)) {
- for (unsigned i = 0; i < glsl_get_matrix_columns(type); i++) {
- nir_deref_array *deref_array = nir_deref_array_create(mem_ctx);
- deref_array->base_offset = i;
- deref_array->deref.type = glsl_get_column_type(type);
-
- nir_deref_var *new_deref_head =
- nir_deref_as_var(nir_copy_deref(mem_ctx, &deref_head->deref));
- get_deref_tail(&new_deref_head->deref)->child =
- &deref_array->deref;
-
- nir_reg_src new_reg = reg;
- new_reg.base_offset += i * glsl_get_vector_elements(type);
-
- var_reg_block_copy_impl(new_reg, new_deref_head, predicate,
- glsl_get_column_type(type), after,
- var_dest, mem_ctx);
- }
- } else {
- if (var_dest) {
- nir_intrinsic_op op;
- switch (glsl_get_vector_elements(type)) {
- case 1: op = nir_intrinsic_store_var_vec1; break;
- case 2: op = nir_intrinsic_store_var_vec2; break;
- case 3: op = nir_intrinsic_store_var_vec3; break;
- case 4: op = nir_intrinsic_store_var_vec4; break;
- default: assert(0); break;
- }
-
- nir_intrinsic_instr *store =
- nir_intrinsic_instr_create(mem_ctx, op);
- store->variables[0] = deref_head;
- store->src[0].reg.reg = reg.reg;
- store->src[0].reg.base_offset = reg.base_offset;
- if (reg.indirect) {
- store->src[0].reg.indirect = ralloc(mem_ctx, nir_src);
- *store->src[0].reg.indirect = *reg.indirect;
- }
-
- if (predicate) {
- store->has_predicate = true;
- store->predicate = nir_src_copy(*predicate, mem_ctx);
- }
-
- nir_instr_insert_before(after, &store->instr);
- } else {
- nir_intrinsic_op op;
- switch (glsl_get_vector_elements(type)) {
- case 1: op = nir_intrinsic_load_var_vec1; break;
- case 2: op = nir_intrinsic_load_var_vec2; break;
- case 3: op = nir_intrinsic_load_var_vec3; break;
- case 4: op = nir_intrinsic_load_var_vec4; break;
- default: assert(0); break;
- }
-
- nir_intrinsic_instr *load =
- nir_intrinsic_instr_create(mem_ctx, op);
- load->variables[0] = deref_head;
- load->dest.reg.reg = reg.reg;
- load->dest.reg.base_offset = reg.base_offset;
- if (reg.indirect) {
- load->dest.reg.indirect = ralloc(mem_ctx, nir_src);
- *load->dest.reg.indirect = *reg.indirect;
- }
-
- if (predicate) {
- load->has_predicate = true;
- load->predicate = nir_src_copy(*predicate, mem_ctx);
- }
-
- nir_instr_insert_before(after, &load->instr);
- }
- }
- break;
-
- case GLSL_TYPE_STRUCT:
- offset = 0;
- for (unsigned i = 0; i < glsl_get_length(type); i++) {
- const struct glsl_type *field_type = glsl_get_struct_field(type, i);
-
- nir_deref_struct *deref_struct = nir_deref_struct_create(mem_ctx, i);
- deref_struct->deref.type = field_type;
-
- nir_deref_var *new_deref_head =
- nir_deref_as_var(nir_copy_deref(mem_ctx, &deref_head->deref));
- get_deref_tail(&new_deref_head->deref)->child =
- &deref_struct->deref;
-
- nir_reg_src new_reg = reg;
- new_reg.base_offset += offset;
-
- var_reg_block_copy_impl(new_reg, new_deref_head, predicate,
- field_type, after, var_dest, mem_ctx);
-
- offset += type_size(field_type);
- }
- break;
-
- case GLSL_TYPE_ARRAY:
- for (unsigned i = 0; i < glsl_get_length(type);
- i++) {
- const struct glsl_type *elem_type = glsl_get_array_element(type);
-
- nir_deref_array *deref_array = nir_deref_array_create(mem_ctx);
- deref_array->base_offset = i;
- deref_array->deref.type = elem_type;
-
- nir_deref_var *new_deref_head =
- nir_deref_as_var(nir_copy_deref(mem_ctx, &deref_head->deref));
- get_deref_tail(&new_deref_head->deref)->child =
- &deref_array->deref;
-
- nir_reg_src new_reg = reg;
- new_reg.base_offset += i * type_size(elem_type);
-
- var_reg_block_copy_impl(new_reg, new_deref_head, predicate,
- elem_type, after, var_dest, mem_ctx);
- }
- break;
-
- default:
- break;
- }
-}
-
-static nir_intrinsic_op
-get_load_op(nir_variable_mode mode, bool indirect, unsigned num_components)
-{
- if (indirect) {
- switch (mode) {
- case nir_var_shader_in:
- switch (num_components) {
- case 1: return nir_intrinsic_load_input_vec1_indirect;
- case 2: return nir_intrinsic_load_input_vec2_indirect;
- case 3: return nir_intrinsic_load_input_vec3_indirect;
- case 4: return nir_intrinsic_load_input_vec4_indirect;
- default: assert(0); break;
- }
- break;
-
- case nir_var_uniform:
- switch (num_components) {
- case 1: return nir_intrinsic_load_uniform_vec1_indirect;
- case 2: return nir_intrinsic_load_uniform_vec2_indirect;
- case 3: return nir_intrinsic_load_uniform_vec3_indirect;
- case 4: return nir_intrinsic_load_uniform_vec4_indirect;
- default: assert(0); break;
- }
- break;
-
- default:
- assert(0);
- break;
- }
- } else {
- switch (mode) {
- case nir_var_shader_in:
- switch (num_components) {
- case 1: return nir_intrinsic_load_input_vec1;
- case 2: return nir_intrinsic_load_input_vec2;
- case 3: return nir_intrinsic_load_input_vec3;
- case 4: return nir_intrinsic_load_input_vec4;
- default: assert(0); break;
- }
- break;
-
- case nir_var_uniform:
- switch (num_components) {
- case 1: return nir_intrinsic_load_uniform_vec1;
- case 2: return nir_intrinsic_load_uniform_vec2;
- case 3: return nir_intrinsic_load_uniform_vec3;
- case 4: return nir_intrinsic_load_uniform_vec4;
- default: assert(0); break;
- }
- break;
-
- default:
- assert(0);
- break;
- }
- }
-
- return nir_intrinsic_load_input_vec1;
-}
-
-/* emits an input -> reg block copy */
-
-static void
-reg_input_block_copy(nir_reg_dest dest, unsigned src_index, nir_src *indirect,
- nir_src *predicate, unsigned size,
- unsigned num_components, nir_variable_mode mode,
- nir_instr *after, void *mem_ctx)
-{
- nir_intrinsic_op op = get_load_op(mode, indirect != NULL, num_components);
-
- nir_intrinsic_instr *load = nir_intrinsic_instr_create(mem_ctx, op);
- load->const_index[0] = src_index;
- load->const_index[1] = size;
- if (indirect)
- load->src[0] = *indirect;
- if (predicate) {
- load->has_predicate = true;
- load->predicate = nir_src_copy(*predicate, mem_ctx);
- }
- load->dest.reg = dest;
- nir_instr_insert_before(after, &load->instr);
-}
-
-/* emits a variable/input -> register block copy */
-
-static void
-var_reg_block_copy(nir_deref_var *src, nir_reg_dest dest, nir_src *predicate,
- bool lower_io, nir_instr *after, nir_function_impl *impl,
- bool native_integers, void *mem_ctx)
-{
- const struct glsl_type *src_type = get_deref_tail(&src->deref)->type;
-
- if (lower_io && (src->var->data.mode == nir_var_shader_in ||
- src->var->data.mode == nir_var_uniform)) {
- unsigned size, num_components;
- if (glsl_type_is_scalar(src_type) || glsl_type_is_vector(src_type)) {
- num_components = glsl_get_vector_elements(src_type);
- size = 1;
- } else {
- num_components = 1;
- size = type_size(src_type);
- }
- bool has_indirect = deref_has_indirect(src);
- nir_src indirect;
- nir_src *indirect_ptr = has_indirect ? &indirect : NULL;
- unsigned offset = get_deref_offset(src, after, impl, native_integers,
- indirect_ptr);
- offset += src->var->data.driver_location;
-
- reg_input_block_copy(dest, offset, indirect_ptr, predicate, size,
- num_components, src->var->data.mode, after,
- mem_ctx);
- } else {
- nir_reg_src reg;
- reg.reg = dest.reg;
- reg.base_offset = dest.base_offset;
- reg.indirect = dest.indirect;
-
- var_reg_block_copy_impl(reg, src, predicate, src_type, after, false,
- mem_ctx);
- }
-}
-
-/* emits a register -> variable copy */
-static void
-reg_var_block_copy(nir_reg_src src, nir_deref_var *dest, nir_src *predicate,
- nir_instr *after, void *mem_ctx)
-{
- const struct glsl_type *dest_type = get_deref_tail(&dest->deref)->type;
-
- var_reg_block_copy_impl(src, dest, predicate, dest_type, after, true,
- mem_ctx);
-}
-
-/*
- * emits an input -> variable block copy using an intermediate register
- */
-static void
-var_var_block_copy(nir_deref_var *src, nir_deref_var *dest, nir_src *predicate,
- nir_instr *after, nir_function_impl *impl,
- bool native_integers, void *mem_ctx)
-{
- const struct glsl_type *type = get_deref_tail(&dest->deref)->type;
- nir_register *reg = nir_local_reg_create(impl);
- if (glsl_type_is_scalar(type) || glsl_type_is_vector(type)) {
- reg->num_components = glsl_get_vector_elements(type);
- } else {
- reg->is_packed = true;
- reg->num_components = 1;
- reg->num_array_elems = type_size(type);
- }
-
- nir_reg_src reg_src;
- reg_src.base_offset = 0;
- reg_src.indirect = NULL;
- reg_src.reg = reg;
-
- nir_reg_dest reg_dest;
- reg_dest.base_offset = 0;
- reg_dest.indirect = NULL;
- reg_dest.reg = reg;
-
- var_reg_block_copy(src, reg_dest, predicate, true, after, impl,
- native_integers, mem_ctx);
- reg_var_block_copy(reg_src, dest, predicate, after, mem_ctx);
-}
-
-/* emits a register -> register block copy */
-static void
-reg_reg_block_copy(nir_reg_dest dest, nir_reg_src src, nir_src *predicate,
- const struct glsl_type *type, nir_instr *after,
- void *mem_ctx)
-{
- if (!dest.reg->is_packed && !src.reg->is_packed)
- assert(dest.reg->num_components == src.reg->num_components);
-
- unsigned size, num_components;
- if (dest.reg->is_packed && src.reg->is_packed) {
- size = type_size(type);
- num_components = 1;
- } else {
- size = 1;
- if (dest.reg->is_packed)
- num_components = src.reg->num_components;
- else
- num_components = dest.reg->num_components;
- }
-
- for (unsigned i = 0; i < size; i++) {
- nir_alu_instr *move = nir_alu_instr_create(mem_ctx, nir_op_imov);
- move->dest.write_mask = (1 << num_components) - 1;
-
- move->dest.dest.reg.reg = dest.reg;
- move->dest.dest.reg.base_offset = dest.base_offset + i;
- if (dest.indirect != NULL) {
- move->dest.dest.reg.indirect = ralloc(mem_ctx, nir_src);
- *move->dest.dest.reg.indirect = *dest.indirect;
- }
-
- if (predicate) {
- move->has_predicate = true;
- move->predicate = nir_src_copy(*predicate, mem_ctx);
- }
-
- move->src[0].src.reg = src;
- move->src[0].src.reg.base_offset += i;
-
- nir_instr_insert_before(after, &move->instr);
- }
-}
-
-static nir_reg_dest
-create_dest(nir_deref_var *deref, nir_instr *instr, nir_register *reg,
- nir_function_impl *impl, bool native_integers, void *mem_ctx)
-{
- nir_reg_dest dest;
- if (deref_has_indirect(deref)) {
- dest.indirect = ralloc(mem_ctx, nir_src);
- dest.indirect->is_ssa = false;
- dest.base_offset = get_deref_offset(deref, instr,
- impl, native_integers,
- dest.indirect);
- } else {
- dest.base_offset = get_deref_offset(deref, instr,
- impl, native_integers, NULL);
- dest.indirect = NULL;
- }
- dest.reg = reg;
-
- return dest;
-}
-
-static nir_reg_src
-create_src(nir_deref_var *deref, nir_instr *instr, nir_register *reg,
- nir_function_impl *impl, bool native_integers, void *mem_ctx)
-{
- nir_reg_src src;
- if (deref_has_indirect(deref)) {
- src.indirect = ralloc(mem_ctx, nir_src);
- src.indirect->is_ssa = false;
- src.base_offset = get_deref_offset(deref, instr,
- impl, native_integers,
- src.indirect);
- } else {
- src.base_offset = get_deref_offset(deref, instr,
- impl, native_integers, NULL);
- src.indirect = NULL;
- }
- src.reg = reg;
-
- return src;
-}
-
-static void
-handle_var_copy(nir_intrinsic_instr *instr, nir_function_impl *impl,
- bool native_integers, bool lower_io, struct hash_table *ht)
-{
- void *mem_ctx = ralloc_parent(instr);
-
- struct hash_entry *entry;
-
- nir_variable *dest_var = instr->variables[0]->var;
- nir_variable *src_var = instr->variables[1]->var;
-
- const struct glsl_type *type =
- get_deref_tail(&instr->variables[0]->deref)->type;
-
- nir_src *predicate = instr->has_predicate ? &instr->predicate : NULL;
-
- /*
- * The source can be either:
- * 1. a variable we're lowering to a register
- * 2. an input or uniform we're lowering to loads from an index
- * 3. a variable we can't lower yet
- *
- * and similarly, the destination can be either:
- * 1. a variable we're lowering to a register
- * 2. a variable we can't lower yet
- *
- * meaning that there are six cases, including the trivial one (where
- * source and destination are #3 and #2 respectively) where we can't do
- * anything.
- */
-
- entry = _mesa_hash_table_search(ht, dest_var);
- if (entry) {
- nir_reg_dest dest = create_dest(instr->variables[0], &instr->instr,
- (nir_register *) entry->data, impl,
- native_integers, mem_ctx);
-
- entry = _mesa_hash_table_search(ht, src_var);
- if (entry) {
- nir_reg_src src = create_src(instr->variables[1], &instr->instr,
- (nir_register *) entry->data, impl,
- native_integers, mem_ctx);
-
- reg_reg_block_copy(dest, src, predicate, type, &instr->instr, mem_ctx);
- } else {
- var_reg_block_copy(instr->variables[1], dest, predicate, lower_io,
- &instr->instr, impl, native_integers, mem_ctx);
- }
- } else {
- entry = _mesa_hash_table_search(ht, src_var);
- if (entry) {
- nir_reg_src src = create_src(instr->variables[1], &instr->instr,
- (nir_register *) entry->data, impl,
- native_integers, mem_ctx);
-
- reg_var_block_copy(src, instr->variables[0], predicate, &instr->instr,
- mem_ctx);
- } else {
- if (!lower_io || (src_var->data.mode != nir_var_shader_in &&
- src_var->data.mode != nir_var_uniform)) {
- /* nothing to do here */
- return;
- }
-
- var_var_block_copy(instr->variables[1], instr->variables[0], predicate,
- &instr->instr, impl, native_integers, mem_ctx);
- }
- }
-
- nir_instr_remove(&instr->instr);
-}
-
-static void
-handle_var_load(nir_intrinsic_instr *instr, nir_function_impl *impl,
- bool native_integers, bool lower_io, struct hash_table *ht)
-{
- void *mem_ctx = ralloc_parent(instr);
-
- struct hash_entry *entry =
- _mesa_hash_table_search(ht, instr->variables[0]->var);
-
- if (entry == NULL) {
- nir_variable *src_var = instr->variables[0]->var;
-
- if (lower_io && (src_var->data.mode == nir_var_shader_in ||
- src_var->data.mode == nir_var_uniform)) {
- bool has_indirect = deref_has_indirect(instr->variables[0]);
- unsigned num_components =
- nir_intrinsic_infos[instr->intrinsic].dest_components;
- nir_src indirect;
- unsigned offset = get_deref_offset(instr->variables[0], &instr->instr,
- impl, native_integers, &indirect);
- offset += src_var->data.driver_location;
-
- nir_intrinsic_op op = get_load_op(src_var->data.mode, has_indirect,
- num_components);
- nir_intrinsic_instr *load = nir_intrinsic_instr_create(mem_ctx, op);
- load->dest = instr->dest;
- load->const_index[0] = (int) offset;
- load->const_index[1] = 1;
- if (has_indirect)
- load->src[0] = indirect;
-
- if (instr->has_predicate) {
- load->has_predicate = true;
- load->predicate = nir_src_copy(instr->predicate, mem_ctx);
- }
-
- nir_instr_insert_before(&instr->instr, &load->instr);
- } else {
- return;
- }
- } else {
- nir_register *reg = (nir_register *) entry->data;
-
- nir_alu_instr *move = nir_alu_instr_create(mem_ctx, nir_op_imov);
- unsigned dest_components =
- nir_intrinsic_infos[instr->intrinsic].dest_components;
- move->dest.dest = instr->dest;
- move->dest.write_mask = (1 << dest_components) - 1;
- move->src[0].src.reg = create_src(instr->variables[0], &instr->instr,
- reg, impl, native_integers, mem_ctx);
- if (instr->has_predicate) {
- move->has_predicate = true;
- move->predicate = nir_src_copy(instr->predicate, mem_ctx);
- }
- nir_instr_insert_before(&instr->instr, &move->instr);
- }
-
- nir_instr_remove(&instr->instr);
-}
-
-static void
-handle_var_store(nir_intrinsic_instr *instr, nir_function_impl *impl,
- bool native_integers, bool lower_io, struct hash_table *ht)
-{
- void *mem_ctx = ralloc_parent(instr);
-
- struct hash_entry *entry =
- _mesa_hash_table_search(ht, instr->variables[0]->var);
- if (entry == NULL)
- return;
-
- nir_register *reg = (nir_register *) entry->data;
-
- nir_alu_instr *move = nir_alu_instr_create(mem_ctx, nir_op_imov);
- unsigned src_components =
- nir_intrinsic_infos[instr->intrinsic].src_components[0];
- move->dest.dest.reg = create_dest(instr->variables[0], &instr->instr,
- reg, impl, native_integers, mem_ctx);
- move->dest.write_mask = (1 << src_components) - 1;
- move->src[0].src = instr->src[0];
- if (instr->has_predicate) {
- move->has_predicate = true;
- move->predicate = nir_src_copy(instr->predicate, mem_ctx);
- }
- nir_instr_insert_before(&instr->instr, &move->instr);
- nir_instr_remove(&instr->instr);
-}
-
-typedef struct {
- struct hash_table *ht;
- bool native_integers, lower_io;
- nir_function_impl *impl;
-} rewrite_state;
-
-static bool
-rewrite_block_cb(nir_block *block, void *_state)
-{
- rewrite_state *state = (rewrite_state *) _state;
-
- nir_foreach_instr_safe(block, instr) {
- if (instr->type == nir_instr_type_intrinsic) {
- nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
- switch (intrin->intrinsic) {
- case nir_intrinsic_load_var_vec1:
- case nir_intrinsic_load_var_vec2:
- case nir_intrinsic_load_var_vec3:
- case nir_intrinsic_load_var_vec4:
- handle_var_load(intrin, state->impl, state->native_integers,
- state->lower_io, state->ht);
- break;
-
- case nir_intrinsic_store_var_vec1:
- case nir_intrinsic_store_var_vec2:
- case nir_intrinsic_store_var_vec3:
- case nir_intrinsic_store_var_vec4:
- handle_var_store(intrin, state->impl, state->native_integers,
- state->lower_io, state->ht);
- break;
-
- case nir_intrinsic_copy_var:
- handle_var_copy(intrin, state->impl, state->native_integers,
- state->lower_io, state->ht);
- break;
-
- default:
- break;
- }
- }
- }
-
- return true;
-}
-
-static void
-rewrite_impl(nir_function_impl *impl, struct hash_table *ht,
- bool native_integers, bool lower_io)
-{
- rewrite_state state;
- state.ht = ht;
- state.native_integers = native_integers;
- state.lower_io = lower_io;
- state.impl = impl;
-
- nir_foreach_block(impl, rewrite_block_cb, &state);
-}
-
-static void
-insert_load_const_impl(nir_function_impl *impl, struct exec_list *vars,
- struct hash_table *ht)
-{
- void *mem_ctx = ralloc_parent(impl);
-
- foreach_list_typed(nir_variable, var, node, vars) {
- if (var->constant_initializer == NULL)
- continue;
-
- struct hash_entry *entry = _mesa_hash_table_search(ht, var);
- if (entry) {
- nir_register *reg = (nir_register *) entry->data;
- nir_reg_dest dest;
- dest.reg = reg;
- dest.base_offset = 0;
- dest.indirect = NULL;
- reg_const_load(dest, var->constant_initializer, var->type, impl,
- mem_ctx);
- }
- }
-}
-
-static nir_intrinsic_op
-get_store_op(bool indirect, unsigned num_components)
-{
- if (indirect) {
- switch (num_components) {
- case 1: return nir_intrinsic_store_output_vec1_indirect;
- case 2: return nir_intrinsic_store_output_vec2_indirect;
- case 3: return nir_intrinsic_store_output_vec3_indirect;
- case 4: return nir_intrinsic_store_output_vec4_indirect;
- default: assert(0); break;
- }
- } else {
- switch (num_components) {
- case 1: return nir_intrinsic_store_output_vec1;
- case 2: return nir_intrinsic_store_output_vec2;
- case 3: return nir_intrinsic_store_output_vec3;
- case 4: return nir_intrinsic_store_output_vec4;
- default: assert(0); break;
- }
- }
-
- return nir_intrinsic_store_output_vec1;
-}
-
-/* emits a reg -> output block copy after a block */
-static void
-reg_output_block_copy_block(nir_reg_src src, unsigned dest_index,
- unsigned num_components, unsigned size,
- nir_block *block, void *mem_ctx)
-{
- nir_intrinsic_op op = get_store_op(false, num_components);
-
- nir_intrinsic_instr *store = nir_intrinsic_instr_create(mem_ctx, op);
- store->const_index[0] = dest_index;
- store->const_index[1] = (size == 0) ? 1 : size;
- store->src[0].reg = src;
- nir_instr_insert_after_block(block, &store->instr);
-}
-
-/* emits a reg -> output copy after an instruction */
-static void
-reg_output_block_copy_instr(nir_reg_src src, unsigned dest_index,
- unsigned num_components, unsigned size,
- nir_instr *after, void *mem_ctx)
-{
- nir_intrinsic_op op = get_store_op(false, num_components);
-
- nir_intrinsic_instr *store = nir_intrinsic_instr_create(mem_ctx, op);
- store->const_index[0] = dest_index;
- store->const_index[1] = (size == 0) ? 1 : size;
- store->src[0].reg = src;
- nir_instr_insert_before(after, &store->instr);
-}
-
-static nir_function_impl *
-find_main(nir_shader *shader)
-{
- foreach_list_typed(nir_function, func, node, &shader->functions) {
- if (strcmp(func->name, "main") == 0) {
- assert(exec_list_length(&func->overload_list) == 1);
- nir_function_overload *overload = nir_function_first_overload(func);
- return overload->impl;
- }
- }
-
- assert(0);
- return NULL;
-}
-
-static void
-insert_output_reg_copies(nir_shader *shader, nir_block *block,
- nir_instr *after, struct hash_table *ht)
-{
- struct hash_entry *entry;
- hash_table_foreach(shader->outputs, entry) {
- nir_variable *var = (nir_variable *) entry->data;
-
- struct hash_entry *entry2;
- entry2 = _mesa_hash_table_search(ht, var);
- if (entry2) {
- nir_register *reg = (nir_register *) entry2->data;
- nir_reg_src src;
- src.reg = reg;
- src.base_offset = 0;
- src.indirect = NULL;
-
- if (after) {
- reg_output_block_copy_instr(src, var->data.driver_location,
- reg->num_components,
- reg->num_array_elems,
- after, shader);
- } else {
- reg_output_block_copy_block(src, var->data.driver_location,
- reg->num_components,
- reg->num_array_elems,
- block, shader);
- }
- }
- }
-}
-
-typedef struct {
- struct hash_table *ht;
- nir_shader *shader;
- bool found_emit_vertex;
-} reg_output_state;
-
-static bool
-insert_output_reg_copies_emit_vertex(nir_block *block, void *_state)
-{
- reg_output_state *state = (reg_output_state *) _state;
-
- nir_foreach_instr(block, instr) {
- if (instr->type == nir_instr_type_intrinsic) {
- nir_intrinsic_instr *intrin_instr = nir_instr_as_intrinsic(instr);
- if (intrin_instr->intrinsic == nir_intrinsic_emit_vertex) {
- insert_output_reg_copies(state->shader, NULL, instr, state->ht);
- state->found_emit_vertex = true;
- }
- }
- }
-
- return true;
-}
-
-static void
-insert_output_reg_copies_shader(nir_shader *shader, struct hash_table *ht)
-{
- nir_function_impl *main_impl = find_main(shader);
-
- reg_output_state state;
- state.shader = shader;
- state.ht = ht;
- state.found_emit_vertex = false;
- nir_foreach_block(main_impl, insert_output_reg_copies_emit_vertex, &state);
-
- if (!state.found_emit_vertex) {
- struct set_entry *entry;
- set_foreach(main_impl->end_block->predecessors, entry) {
- nir_block *block = (nir_block *) entry->key;
- insert_output_reg_copies(shader, block, NULL, ht);
- }
- }
-}
-
-static void
-rewrite_shader(nir_shader *shader, struct hash_table *ht, bool native_integers,
- bool lower_globals, bool lower_io)
-{
- nir_foreach_overload(shader, overload) {
- if (overload->impl) {
- insert_load_const_impl(overload->impl, &overload->impl->locals, ht);
- if (lower_globals && strcmp(overload->function->name, "main") == 0)
- insert_load_const_impl(overload->impl, &shader->globals, ht);
- rewrite_impl(overload->impl, ht, native_integers, lower_io);
- }
- }
-}
-
-void
-nir_lower_variables_scalar(nir_shader *shader, bool lower_globals,
- bool lower_io, bool add_names, bool native_integers)
-{
- if (lower_io)
- assign_var_locations_shader(shader);
- struct hash_table *ht = init_var_ht(shader, lower_globals, lower_io,
- add_names);
- remove_local_vars_shader(shader, ht);
- rewrite_shader(shader, ht, native_integers, lower_globals, lower_io);
- if (lower_io)
- insert_output_reg_copies_shader(shader, ht);
- _mesa_hash_table_destroy(ht, NULL);
-}
projects / mesa.git / commitdiff