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237f2f2d8b
When Connor originally drafted NIR, he copied the same function+overload system that GLSL IR had with a few names changed. However, this double-indirection is not really needed and has only served to confuse people. Instead, let's just have functions which may not have unique names and may or may not have an implementation. If someone wants to do overload resolving, they can hav a hash table based function+overload system in the overload resolving pass. There's no good reason to keep it in core NIR. Reviewed-by: Connor Abbott <cwabbott0@gmail.com> Acked-by: Kenneth Graunke <kenneth@whitecape.org> ir3 bits are Reviewed-by: Rob Clark <robclark@gmail.com>
141 lines
3.9 KiB
C
141 lines
3.9 KiB
C
/*
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* Copyright © 2014 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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* Authors:
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* Connor Abbott (cwabbott0@gmail.com)
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*
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*/
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#include "nir.h"
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static void
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add_var_use_intrinsic(nir_intrinsic_instr *instr, struct set *live)
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{
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unsigned num_vars = nir_intrinsic_infos[instr->intrinsic].num_variables;
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for (unsigned i = 0; i < num_vars; i++) {
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nir_variable *var = instr->variables[i]->var;
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_mesa_set_add(live, var);
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}
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}
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static void
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add_var_use_call(nir_call_instr *instr, struct set *live)
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{
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if (instr->return_deref != NULL) {
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nir_variable *var = instr->return_deref->var;
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_mesa_set_add(live, var);
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}
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for (unsigned i = 0; i < instr->num_params; i++) {
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nir_variable *var = instr->params[i]->var;
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_mesa_set_add(live, var);
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}
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}
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static void
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add_var_use_tex(nir_tex_instr *instr, struct set *live)
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{
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if (instr->sampler != NULL) {
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nir_variable *var = instr->sampler->var;
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_mesa_set_add(live, var);
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}
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}
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static bool
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add_var_use_block(nir_block *block, void *state)
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{
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struct set *live = state;
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nir_foreach_instr(block, instr) {
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switch(instr->type) {
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case nir_instr_type_intrinsic:
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add_var_use_intrinsic(nir_instr_as_intrinsic(instr), live);
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break;
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case nir_instr_type_call:
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add_var_use_call(nir_instr_as_call(instr), live);
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break;
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case nir_instr_type_tex:
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add_var_use_tex(nir_instr_as_tex(instr), live);
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break;
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default:
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break;
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}
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}
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return true;
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}
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static void
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add_var_use_shader(nir_shader *shader, struct set *live)
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{
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nir_foreach_function(shader, function) {
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if (function->impl) {
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nir_foreach_block(function->impl, add_var_use_block, live);
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}
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}
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}
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static bool
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remove_dead_vars(struct exec_list *var_list, struct set *live)
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{
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bool progress = false;
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foreach_list_typed_safe(nir_variable, var, node, var_list) {
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struct set_entry *entry = _mesa_set_search(live, var);
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if (entry == NULL) {
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exec_node_remove(&var->node);
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ralloc_free(var);
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progress = true;
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}
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}
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return progress;
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}
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bool
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nir_remove_dead_variables(nir_shader *shader)
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{
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bool progress = false;
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struct set *live =
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_mesa_set_create(NULL, _mesa_hash_pointer, _mesa_key_pointer_equal);
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add_var_use_shader(shader, live);
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progress = remove_dead_vars(&shader->globals, live) || progress;
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nir_foreach_function(shader, function) {
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if (function->impl) {
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if (remove_dead_vars(&function->impl->locals, live)) {
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nir_metadata_preserve(function->impl, nir_metadata_block_index |
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nir_metadata_dominance |
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nir_metadata_live_ssa_defs);
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progress = true;
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}
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}
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}
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_mesa_set_destroy(live, NULL);
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return progress;
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}
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