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/*
* Copyright © 2017 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"
/**
* \file nir_opt_intrinsics.c
*/
static bool
opt_intrinsics_impl(nir_function_impl *impl,
const struct nir_shader_compiler_options *options)
{
nir_builder b;
nir_builder_init(&b, impl);
bool progress = false;
nir_foreach_block(block, impl) {
nir_foreach_instr_safe(instr, block) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
nir_ssa_def *replacement = NULL;
b.cursor = nir_before_instr(instr);
switch (intrin->intrinsic) {
case nir_intrinsic_vote_any:
case nir_intrinsic_vote_all:
if (nir_src_is_const(intrin->src[0]))
replacement = nir_ssa_for_src(&b, intrin->src[0], 1);
break;
case nir_intrinsic_vote_feq:
case nir_intrinsic_vote_ieq:
if (nir_src_is_const(intrin->src[0]))
replacement = nir_imm_true(&b);
break;
case nir_intrinsic_load_sample_mask_in:
/* Transform:
* gl_SampleMaskIn == 0 ---> gl_HelperInvocation
* gl_SampleMaskIn != 0 ---> !gl_HelperInvocation
*/
if (!options->optimize_sample_mask_in)
continue;
nir_foreach_use_safe(use_src, &intrin->dest.ssa) {
if (use_src->parent_instr->type == nir_instr_type_alu) {
nir_alu_instr *alu = nir_instr_as_alu(use_src->parent_instr);
if (alu->op == nir_op_ieq ||
alu->op == nir_op_ine) {
/* Check for 0 in either operand. */
nir_const_value *const_val =
nir_src_as_const_value(alu->src[0].src);
if (!const_val)
const_val = nir_src_as_const_value(alu->src[1].src);
if (!const_val || const_val->i32 != 0)
continue;
nir_ssa_def *new_expr = nir_load_helper_invocation(&b, 1);
if (alu->op == nir_op_ine)
new_expr = nir_inot(&b, new_expr);
nir_ssa_def_rewrite_uses(&alu->dest.dest.ssa,
nir_src_for_ssa(new_expr));
nir_instr_remove(&alu->instr);
continue;
}
}
}
continue;
default:
break;
}
if (!replacement)
continue;
nir_ssa_def_rewrite_uses(&intrin->dest.ssa,
nir_src_for_ssa(replacement));
nir_instr_remove(instr);
progress = true;
}
}
return progress;
}
bool
nir_opt_intrinsics(nir_shader *shader)
{
bool progress = false;
nir_foreach_function(function, shader) {
if (!function->impl)
continue;
if (opt_intrinsics_impl(function->impl, shader->options)) {
progress = true;
nir_metadata_preserve(function->impl, nir_metadata_block_index |
nir_metadata_dominance);
}
}
return progress;
}
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