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/*
* Copyright © 2014 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.
*
* Authors:
* Connor Abbott (cwabbott0@gmail.com)
*
*/
#include "nir.h"
#include "nir_builder.h"
struct lower_system_values_state {
nir_builder builder;
bool progress;
};
static bool
convert_block(nir_block *block, void *void_state)
{
struct lower_system_values_state *state = void_state;
nir_builder *b = &state->builder;
nir_foreach_instr_safe(block, instr) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *load_var = nir_instr_as_intrinsic(instr);
if (load_var->intrinsic != nir_intrinsic_load_var)
continue;
nir_variable *var = load_var->variables[0]->var;
if (var->data.mode != nir_var_system_value)
continue;
b->cursor = nir_after_instr(&load_var->instr);
nir_intrinsic_op sysval_op =
nir_intrinsic_from_system_value(var->data.location);
nir_ssa_def *sysval = nir_load_system_value(b, sysval_op, 0);
nir_ssa_def_rewrite_uses(&load_var->dest.ssa, nir_src_for_ssa(sysval));
nir_instr_remove(&load_var->instr);
state->progress = true;
}
return true;
}
static bool
convert_impl(nir_function_impl *impl)
{
struct lower_system_values_state state;
state.progress = false;
nir_builder_init(&state.builder, impl);
nir_foreach_block(impl, convert_block, &state);
nir_metadata_preserve(impl, nir_metadata_block_index |
nir_metadata_dominance);
return state.progress;
}
bool
nir_lower_system_values(nir_shader *shader)
{
bool progress = false;
nir_foreach_function(shader, function) {
if (function->impl)
progress = convert_impl(function->impl) || progress;
}
exec_list_make_empty(&shader->system_values);
return progress;
}
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