2015-08-05 00:25:24 +01:00
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/*
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* Copyright © 2015 Broadcom
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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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2016-04-20 09:42:25 +01:00
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#include "nir_builder.h"
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2015-08-05 00:25:24 +01:00
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/** @file nir_opt_undef.c
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*
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2016-04-20 09:15:53 +01:00
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* Handles optimization of operations involving ssa_undef.
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2015-08-05 00:25:24 +01:00
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*/
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2016-04-20 09:15:53 +01:00
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/**
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* Turn conditional selects between an undef and some other value into a move
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* of that other value (on the assumption that the condition's going to be
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* choosing the defined value). This reduces work after if flattening when
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* each side of the if is defining a variable.
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*/
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2015-08-05 00:25:24 +01:00
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static bool
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2016-04-20 09:15:53 +01:00
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opt_undef_csel(nir_alu_instr *instr)
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2015-08-05 00:25:24 +01:00
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{
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if (instr->op != nir_op_bcsel && instr->op != nir_op_fcsel)
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return false;
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assert(instr->dest.dest.is_ssa);
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for (int i = 1; i <= 2; i++) {
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if (!instr->src[i].src.is_ssa)
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continue;
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nir_instr *parent = instr->src[i].src.ssa->parent_instr;
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if (parent->type != nir_instr_type_ssa_undef)
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continue;
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/* We can't just use nir_alu_src_copy, because we need the def/use
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* updated.
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*/
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nir_instr_rewrite_src(&instr->instr, &instr->src[0].src,
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instr->src[i == 1 ? 2 : 1].src);
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nir_alu_src_copy(&instr->src[0], &instr->src[i == 1 ? 2 : 1],
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ralloc_parent(instr));
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nir_src empty_src;
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memset(&empty_src, 0, sizeof(empty_src));
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nir_instr_rewrite_src(&instr->instr, &instr->src[1].src, empty_src);
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nir_instr_rewrite_src(&instr->instr, &instr->src[2].src, empty_src);
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instr->op = nir_op_imov;
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return true;
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}
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return false;
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}
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2016-04-20 09:42:25 +01:00
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/**
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* Replace vecN(undef, undef, ...) with a single undef.
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*/
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static bool
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opt_undef_vecN(nir_builder *b, nir_alu_instr *alu)
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{
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if (alu->op != nir_op_vec2 &&
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alu->op != nir_op_vec3 &&
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2016-12-15 05:51:13 +00:00
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alu->op != nir_op_vec4)
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2016-04-20 09:42:25 +01:00
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return false;
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assert(alu->dest.dest.is_ssa);
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unsigned num_components = nir_op_infos[alu->op].num_inputs;
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for (unsigned i = 0; i < num_components; i++) {
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if (!alu->src[i].src.is_ssa ||
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alu->src[i].src.ssa->parent_instr->type != nir_instr_type_ssa_undef)
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return false;
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}
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b->cursor = nir_before_instr(&alu->instr);
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nir_ssa_def *undef =
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nir_ssa_undef(b, num_components, nir_dest_bit_size(alu->dest.dest));
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nir_ssa_def_rewrite_uses(&alu->dest.dest.ssa, nir_src_for_ssa(undef));
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return true;
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}
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2016-04-20 10:38:57 +01:00
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/**
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* Remove any store intrinsics whose value is undefined (the existing
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* value is a fine representation of "undefined").
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*/
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static bool
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opt_undef_store(nir_intrinsic_instr *intrin)
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{
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switch (intrin->intrinsic) {
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case nir_intrinsic_store_var:
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case nir_intrinsic_store_output:
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case nir_intrinsic_store_per_vertex_output:
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case nir_intrinsic_store_ssbo:
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case nir_intrinsic_store_shared:
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break;
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default:
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return false;
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}
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if (!intrin->src[0].is_ssa ||
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intrin->src[0].ssa->parent_instr->type != nir_instr_type_ssa_undef)
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return false;
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nir_instr_remove(&intrin->instr);
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return true;
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}
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2015-08-05 00:25:24 +01:00
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bool
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nir_opt_undef(nir_shader *shader)
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{
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2016-04-20 09:42:25 +01:00
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nir_builder b;
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2015-08-05 00:25:24 +01:00
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bool progress = false;
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2016-04-27 04:26:42 +01:00
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nir_foreach_function(function, shader) {
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2015-12-26 18:00:47 +00:00
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if (function->impl) {
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2016-04-20 09:42:25 +01:00
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nir_builder_init(&b, function->impl);
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2016-04-12 19:46:03 +01:00
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nir_foreach_block(block, function->impl) {
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2016-04-27 02:34:19 +01:00
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nir_foreach_instr_safe(instr, block) {
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2016-04-20 09:15:53 +01:00
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if (instr->type == nir_instr_type_alu) {
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nir_alu_instr *alu = nir_instr_as_alu(instr);
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progress = opt_undef_csel(alu) || progress;
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2016-04-20 09:42:25 +01:00
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progress = opt_undef_vecN(&b, alu) || progress;
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2016-04-20 10:38:57 +01:00
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} else if (instr->type == nir_instr_type_intrinsic) {
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nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
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progress = opt_undef_store(intrin) || progress;
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2016-04-20 09:15:53 +01:00
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}
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2016-04-12 19:46:03 +01:00
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}
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}
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2015-08-05 00:25:24 +01:00
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if (progress)
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2015-12-26 18:00:47 +00:00
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nir_metadata_preserve(function->impl,
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2015-08-05 00:25:24 +01:00
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nir_metadata_block_index |
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nir_metadata_dominance);
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}
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}
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return progress;
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}
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