202 lines
6.5 KiB
C
202 lines
6.5 KiB
C
/*
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* Copyright © 2018 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "nir.h"
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#include "nir_deref.h"
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struct split_struct_state {
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void *dead_ctx;
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struct hash_table *var_to_member_map;
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};
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static nir_variable *
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find_var_member(struct nir_variable *var, unsigned member,
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struct hash_table *var_to_member_map)
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{
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struct hash_entry *map_entry =
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_mesa_hash_table_search(var_to_member_map, var);
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if (map_entry == NULL)
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return NULL;
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nir_variable **members = map_entry->data;
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assert(member < var->num_members);
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return members[member];
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}
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static const struct glsl_type *
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member_type(const struct glsl_type *type, unsigned index)
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{
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if (glsl_type_is_array(type)) {
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const struct glsl_type *elem =
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member_type(glsl_get_array_element(type), index);
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assert(glsl_get_explicit_stride(type) == 0);
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return glsl_array_type(elem, glsl_get_length(type), 0);
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} else {
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assert(glsl_type_is_struct_or_ifc(type));
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assert(index < glsl_get_length(type));
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return glsl_get_struct_field(type, index);
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}
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}
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static void
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split_variable(struct nir_variable *var, nir_shader *shader,
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struct hash_table *var_to_member_map, void *dead_ctx)
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{
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assert(var->state_slots == NULL);
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/* Constant initializers are currently not handled */
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assert(var->constant_initializer == NULL && var->pointer_initializer == NULL);
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nir_variable **members =
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ralloc_array(dead_ctx, nir_variable *, var->num_members);
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for (unsigned i = 0; i < var->num_members; i++) {
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char *member_name = NULL;
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if (var->name) {
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/* Calculate a reasonable variable name */
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member_name = ralloc_strdup(dead_ctx, var->name);
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const struct glsl_type *t = var->type;
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while (glsl_type_is_array(t)) {
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ralloc_strcat(&member_name, "[*]");
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t = glsl_get_array_element(t);
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}
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const char *field_name = glsl_get_struct_elem_name(t, i);
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if (field_name) {
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member_name = ralloc_asprintf(dead_ctx, "%s.%s",
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member_name, field_name);
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} else {
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member_name = ralloc_asprintf(dead_ctx, "%s.@%d", member_name, i);
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}
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}
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members[i] =
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nir_variable_create(shader, var->members[i].mode,
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member_type(var->type, i), member_name);
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if (var->interface_type) {
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members[i]->interface_type =
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glsl_get_struct_field(var->interface_type, i);
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}
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members[i]->data = var->members[i];
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}
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_mesa_hash_table_insert(var_to_member_map, var, members);
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}
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static nir_deref_instr *
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build_member_deref(nir_builder *b, nir_deref_instr *deref, nir_variable *member)
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{
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if (deref->deref_type == nir_deref_type_var) {
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return nir_build_deref_var(b, member);
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} else {
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nir_deref_instr *parent =
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build_member_deref(b, nir_deref_instr_parent(deref), member);
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return nir_build_deref_follower(b, parent, deref);
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}
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}
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static void
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rewrite_deref_instr(nir_builder *b, nir_deref_instr *deref,
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struct hash_table *var_to_member_map)
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{
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/* We must be a struct deref */
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if (deref->deref_type != nir_deref_type_struct)
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return;
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nir_deref_instr *base;
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for (base = nir_deref_instr_parent(deref);
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base && base->deref_type != nir_deref_type_var;
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base = nir_deref_instr_parent(base)) {
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/* If this struct is nested inside another, bail */
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if (base->deref_type == nir_deref_type_struct)
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return;
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}
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/* We must be on a variable with members */
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if (!base || base->var->num_members == 0)
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return;
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nir_variable *member = find_var_member(base->var, deref->strct.index,
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var_to_member_map);
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assert(member);
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b->cursor = nir_before_instr(&deref->instr);
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nir_deref_instr *member_deref =
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build_member_deref(b, nir_deref_instr_parent(deref), member);
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nir_ssa_def_rewrite_uses(&deref->dest.ssa,
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&member_deref->dest.ssa);
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/* The referenced variable is no longer valid, clean up the deref */
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nir_deref_instr_remove_if_unused(deref);
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}
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bool
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nir_split_per_member_structs(nir_shader *shader)
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{
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bool progress = false;
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void *dead_ctx = ralloc_context(NULL);
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struct hash_table *var_to_member_map =
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_mesa_pointer_hash_table_create(dead_ctx);
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nir_foreach_variable_with_modes_safe(var, shader, nir_var_shader_in |
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nir_var_shader_out |
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nir_var_system_value) {
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if (var->num_members == 0)
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continue;
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split_variable(var, shader, var_to_member_map, dead_ctx);
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exec_node_remove(&var->node);
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progress = true;
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}
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if (!progress) {
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ralloc_free(dead_ctx);
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return false;
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}
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nir_foreach_function(function, shader) {
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if (!function->impl)
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continue;
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nir_builder b;
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nir_builder_init(&b, function->impl);
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nir_foreach_block(block, function->impl) {
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nir_foreach_instr_safe(instr, block) {
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if (instr->type == nir_instr_type_deref) {
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rewrite_deref_instr(&b, nir_instr_as_deref(instr),
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var_to_member_map);
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}
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}
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}
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nir_metadata_preserve(function->impl,
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nir_metadata_block_index |
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nir_metadata_dominance);
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}
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ralloc_free(dead_ctx);
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return progress;
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}
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