231 lines
7.0 KiB
C
231 lines
7.0 KiB
C
/*
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* Copyright © 2017 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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#include "nir.h"
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#include "nir_builder.h"
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/**
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* \file nir_opt_intrinsics.c
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*/
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static bool
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src_is_single_use_shuffle(nir_src src, nir_ssa_def **data, nir_ssa_def **index)
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{
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nir_intrinsic_instr *shuffle = nir_src_as_intrinsic(src);
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if (shuffle == NULL || shuffle->intrinsic != nir_intrinsic_shuffle)
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return false;
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/* This is only called when src is part of an ALU op so requiring no if
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* uses is reasonable. If we ever want to use this from an if statement,
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* we can change it then.
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*/
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if (!list_is_empty(&shuffle->dest.ssa.if_uses) ||
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!list_is_singular(&shuffle->dest.ssa.uses))
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return false;
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assert(shuffle->src[0].is_ssa);
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assert(shuffle->src[1].is_ssa);
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*data = shuffle->src[0].ssa;
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*index = shuffle->src[1].ssa;
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return true;
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}
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static nir_ssa_def *
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try_opt_bcsel_of_shuffle(nir_builder *b, nir_alu_instr *alu,
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bool block_has_discard)
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{
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assert(alu->op == nir_op_bcsel);
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/* If we've seen a discard in this block, don't do the optimization. We
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* could try to do something fancy where we check if the shuffle is on our
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* side of the discard or not but this is good enough for correctness for
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* now and subgroup ops in the presence of discard aren't common.
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*/
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if (block_has_discard)
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return false;
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if (!nir_alu_src_is_trivial_ssa(alu, 0))
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return NULL;
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nir_ssa_def *data1, *index1;
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if (!nir_alu_src_is_trivial_ssa(alu, 1) ||
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alu->src[1].src.ssa->parent_instr->block != alu->instr.block ||
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!src_is_single_use_shuffle(alu->src[1].src, &data1, &index1))
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return NULL;
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nir_ssa_def *data2, *index2;
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if (!nir_alu_src_is_trivial_ssa(alu, 2) ||
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alu->src[2].src.ssa->parent_instr->block != alu->instr.block ||
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!src_is_single_use_shuffle(alu->src[2].src, &data2, &index2))
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return NULL;
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if (data1 != data2)
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return NULL;
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nir_ssa_def *index = nir_bcsel(b, alu->src[0].src.ssa, index1, index2);
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nir_ssa_def *shuffle = nir_shuffle(b, data1, index);
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return shuffle;
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}
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static bool
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opt_intrinsics_alu(nir_builder *b, nir_alu_instr *alu,
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bool block_has_discard)
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{
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nir_ssa_def *replacement = NULL;
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switch (alu->op) {
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case nir_op_bcsel:
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replacement = try_opt_bcsel_of_shuffle(b, alu, block_has_discard);
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break;
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default:
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break;
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}
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if (replacement) {
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nir_ssa_def_rewrite_uses(&alu->dest.dest.ssa,
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replacement);
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nir_instr_remove(&alu->instr);
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return true;
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} else {
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return false;
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}
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}
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static bool
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opt_intrinsics_intrin(nir_builder *b, nir_intrinsic_instr *intrin,
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const struct nir_shader_compiler_options *options)
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{
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switch (intrin->intrinsic) {
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case nir_intrinsic_load_sample_mask_in: {
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/* Transform:
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* gl_SampleMaskIn == 0 ---> gl_HelperInvocation
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* gl_SampleMaskIn != 0 ---> !gl_HelperInvocation
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*/
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if (!options->optimize_sample_mask_in)
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return false;
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bool progress = false;
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nir_foreach_use_safe(use_src, &intrin->dest.ssa) {
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if (use_src->parent_instr->type == nir_instr_type_alu) {
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nir_alu_instr *alu = nir_instr_as_alu(use_src->parent_instr);
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if (alu->op == nir_op_ieq ||
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alu->op == nir_op_ine) {
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/* Check for 0 in either operand. */
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nir_const_value *const_val =
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nir_src_as_const_value(alu->src[0].src);
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if (!const_val)
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const_val = nir_src_as_const_value(alu->src[1].src);
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if (!const_val || const_val->i32 != 0)
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continue;
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nir_ssa_def *new_expr = nir_load_helper_invocation(b, 1);
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if (alu->op == nir_op_ine)
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new_expr = nir_inot(b, new_expr);
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nir_ssa_def_rewrite_uses(&alu->dest.dest.ssa,
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new_expr);
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nir_instr_remove(&alu->instr);
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progress = true;
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}
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}
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}
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return progress;
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}
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default:
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return false;
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}
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}
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static bool
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opt_intrinsics_impl(nir_function_impl *impl,
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const struct nir_shader_compiler_options *options)
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{
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nir_builder b;
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nir_builder_init(&b, impl);
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bool progress = false;
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nir_foreach_block(block, impl) {
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bool block_has_discard = false;
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nir_foreach_instr_safe(instr, block) {
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b.cursor = nir_before_instr(instr);
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switch (instr->type) {
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case nir_instr_type_alu:
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if (opt_intrinsics_alu(&b, nir_instr_as_alu(instr),
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block_has_discard))
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progress = true;
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break;
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case nir_instr_type_intrinsic: {
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nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
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if (intrin->intrinsic == nir_intrinsic_discard ||
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intrin->intrinsic == nir_intrinsic_discard_if ||
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intrin->intrinsic == nir_intrinsic_demote ||
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intrin->intrinsic == nir_intrinsic_demote_if ||
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intrin->intrinsic == nir_intrinsic_terminate ||
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intrin->intrinsic == nir_intrinsic_terminate_if)
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block_has_discard = true;
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if (opt_intrinsics_intrin(&b, intrin, options))
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progress = true;
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break;
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}
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default:
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break;
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}
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}
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}
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return progress;
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}
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bool
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nir_opt_intrinsics(nir_shader *shader)
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{
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bool progress = false;
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nir_foreach_function(function, shader) {
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if (!function->impl)
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continue;
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if (opt_intrinsics_impl(function->impl, shader->options)) {
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progress = true;
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nir_metadata_preserve(function->impl, nir_metadata_block_index |
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nir_metadata_dominance);
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} else {
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nir_metadata_preserve(function->impl, nir_metadata_all);
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}
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}
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return progress;
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}
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