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/*
* Copyright © 2016 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.
*/
#include "nir.h"
#include "nir_builder.h"
static bool
deref_apply_constant_initializer(nir_deref_var *deref, void *state)
{
struct nir_builder *b = state;
nir_load_const_instr *initializer =
nir_deref_get_const_initializer_load(b->shader, deref);
nir_builder_instr_insert(b, &initializer->instr);
nir_store_deref_var(b, deref, &initializer->def, 0xf);
return true;
}
static bool
lower_const_initializer(struct nir_builder *b, struct exec_list *var_list)
{
bool progress = false;
b->cursor = nir_before_cf_list(&b->impl->body);
nir_foreach_variable(var, var_list) {
if (!var->constant_initializer)
continue;
progress = true;
nir_deref_var deref;
deref.deref.deref_type = nir_deref_type_var,
deref.deref.child = NULL;
deref.deref.type = var->type,
deref.var = var;
nir_deref_foreach_leaf(&deref, deref_apply_constant_initializer, b);
var->constant_initializer = NULL;
}
return progress;
}
bool
nir_lower_constant_initializers(nir_shader *shader, nir_variable_mode modes)
{
bool progress = false;
nir_builder builder;
if (modes & ~nir_var_local)
nir_builder_init(&builder, nir_shader_get_entrypoint(shader));
if (modes & nir_var_shader_out)
progress |= lower_const_initializer(&builder, &shader->outputs);
if (modes & nir_var_global)
progress |= lower_const_initializer(&builder, &shader->globals);
if (modes & nir_var_system_value)
progress |= lower_const_initializer(&builder, &shader->system_values);
if (progress) {
nir_foreach_function(function, shader) {
if (function->impl) {
nir_metadata_preserve(function->impl, nir_metadata_block_index |
nir_metadata_dominance |
nir_metadata_live_ssa_defs);
}
}
}
if (modes & nir_var_local) {
nir_foreach_function(function, shader) {
if (!function->impl)
continue;
nir_builder_init(&builder, function->impl);
if (lower_const_initializer(&builder, &function->impl->locals)) {
nir_metadata_preserve(function->impl, nir_metadata_block_index |
nir_metadata_dominance |
nir_metadata_live_ssa_defs);
progress = true;
}
}
}
return progress;
}
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