116 lines
3.7 KiB
C
116 lines
3.7 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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* Jason Ekstrand (jason@jlekstrand.net)
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*
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*/
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/*
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* This lowering pass detects when a global variable is only being used by
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* one function and makes it local to that function
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*/
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#include "nir.h"
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static void
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register_var_use(nir_variable *var, nir_function_impl *impl,
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struct hash_table *var_func_table)
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{
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if (var->data.mode != nir_var_shader_temp)
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return;
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struct hash_entry *entry =
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_mesa_hash_table_search(var_func_table, var);
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if (entry) {
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if (entry->data != impl)
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entry->data = NULL;
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} else {
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_mesa_hash_table_insert(var_func_table, var, impl);
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}
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}
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static bool
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mark_global_var_uses_block(nir_block *block, nir_function_impl *impl,
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struct hash_table *var_func_table)
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{
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nir_foreach_instr(instr, block) {
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if (instr->type == nir_instr_type_deref) {
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nir_deref_instr *deref = nir_instr_as_deref(instr);
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if (deref->deref_type == nir_deref_type_var)
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register_var_use(deref->var, impl, var_func_table);
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}
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}
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return true;
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}
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bool
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nir_lower_global_vars_to_local(nir_shader *shader)
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{
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bool progress = false;
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/* A hash table keyed on variable pointers that stores the unique
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* nir_function_impl that uses the given variable. If a variable is
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* used in multiple functions, the data for the given key will be NULL.
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*/
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struct hash_table *var_func_table = _mesa_pointer_hash_table_create(NULL);
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nir_foreach_function(function, shader) {
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if (function->impl) {
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nir_foreach_block(block, function->impl)
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mark_global_var_uses_block(block, function->impl, var_func_table);
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}
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}
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nir_foreach_variable_with_modes_safe(var, shader, nir_var_shader_temp) {
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struct hash_entry *entry = _mesa_hash_table_search(var_func_table, var);
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if (!entry)
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continue;
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nir_function_impl *impl = entry->data;
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if (impl != NULL) {
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exec_node_remove(&var->node);
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var->data.mode = nir_var_function_temp;
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exec_list_push_tail(&impl->locals, &var->node);
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nir_metadata_preserve(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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_mesa_hash_table_destroy(var_func_table, NULL);
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if (progress)
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nir_fixup_deref_modes(shader);
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nir_foreach_function(function, shader) {
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if (function->impl)
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nir_metadata_preserve(function->impl, nir_metadata_all);
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}
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return progress;
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}
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