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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 void
build_constant_load(nir_builder *b, nir_deref_instr *deref, nir_constant *c)
{
if (glsl_type_is_vector_or_scalar(deref->type)) {
nir_load_const_instr *load =
nir_load_const_instr_create(b->shader,
glsl_get_vector_elements(deref->type),
glsl_get_bit_size(deref->type));
memcpy(load->value, c->values, sizeof(*load->value) * load->def.num_components);
nir_builder_instr_insert(b, &load->instr);
nir_store_deref(b, deref, &load->def, ~0);
} else if (glsl_type_is_struct_or_ifc(deref->type)) {
unsigned len = glsl_get_length(deref->type);
for (unsigned i = 0; i < len; i++) {
build_constant_load(b, nir_build_deref_struct(b, deref, i),
c->elements[i]);
}
} else {
assert(glsl_type_is_array(deref->type) ||
glsl_type_is_matrix(deref->type));
unsigned len = glsl_get_length(deref->type);
for (unsigned i = 0; i < len; i++) {
build_constant_load(b,
nir_build_deref_array_imm(b, deref, i),
c->elements[i]);
}
}
}
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) {
build_constant_load(b, nir_build_deref_var(b, var),
var->constant_initializer);
progress = true;
var->constant_initializer = NULL;
} else if (var->pointer_initializer) {
nir_deref_instr *src_deref = nir_build_deref_var(b, var->pointer_initializer);
nir_deref_instr *dst_deref = nir_build_deref_var(b, var);
/* Note that this stores a pointer to src into dst */
nir_store_deref(b, dst_deref, &src_deref->dest.ssa, ~0);
progress = true;
var->pointer_initializer = NULL;
}
}
return progress;
}
bool
nir_lower_variable_initializers(nir_shader *shader, nir_variable_mode modes)
{
bool progress = false;
nir_foreach_function(function, shader) {
if (!function->impl)
continue;
bool impl_progress = false;
nir_builder builder;
nir_builder_init(&builder, function->impl);
if ((modes & nir_var_shader_out) && function->is_entrypoint)
impl_progress |= lower_const_initializer(&builder, &shader->outputs);
if ((modes & nir_var_shader_temp) && function->is_entrypoint)
impl_progress |= lower_const_initializer(&builder, &shader->globals);
if ((modes & nir_var_system_value) && function->is_entrypoint)
impl_progress |= lower_const_initializer(&builder, &shader->system_values);
if (modes & nir_var_function_temp)
impl_progress |= lower_const_initializer(&builder, &function->impl->locals);
if (impl_progress) {
progress = true;
nir_metadata_preserve(function->impl, nir_metadata_block_index |
nir_metadata_dominance |
nir_metadata_live_ssa_defs);
} else {
#ifndef NDEBUG
function->impl->valid_metadata &= ~nir_metadata_not_properly_reset;
#endif
}
}
return progress;
}
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