198 lines
5.4 KiB
C
198 lines
5.4 KiB
C
/*
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* Copyright © 2014 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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* Authors:
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* Connor Abbott (cwabbott0@gmail.com)
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*
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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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* SSA-based copy propagation
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*/
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static bool
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is_swizzleless_move(nir_alu_instr *instr)
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{
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unsigned num_comp = instr->dest.dest.ssa.num_components;
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if (instr->src[0].src.ssa->num_components != num_comp)
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return false;
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if (instr->op == nir_op_mov) {
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for (unsigned i = 0; i < num_comp; i++) {
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if (instr->src[0].swizzle[i] != i)
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return false;
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}
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} else {
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for (unsigned i = 0; i < num_comp; i++) {
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if (instr->src[i].swizzle[0] != i ||
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instr->src[i].src.ssa != instr->src[0].src.ssa)
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return false;
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}
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}
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return true;
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}
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static bool
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rewrite_to_vec(nir_function_impl *impl, nir_alu_instr *mov, nir_alu_instr *vec)
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{
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if (mov->op != nir_op_mov)
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return false;
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nir_builder b;
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nir_builder_init(&b, impl);
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b.cursor = nir_after_instr(&mov->instr);
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unsigned num_comp = mov->dest.dest.ssa.num_components;
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nir_alu_instr *new_vec = nir_alu_instr_create(b.shader, nir_op_vec(num_comp));
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for (unsigned i = 0; i < num_comp; i++)
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new_vec->src[i] = vec->src[mov->src[0].swizzle[i]];
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nir_ssa_def *new = nir_builder_alu_instr_finish_and_insert(&b, new_vec);
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nir_ssa_def_rewrite_uses(&mov->dest.dest.ssa, new);
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/* If we remove "mov" and it's the next instruction in the
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* nir_foreach_instr_safe() loop, then we would end copy-propagation early. */
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return true;
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}
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static bool
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copy_propagate_alu(nir_function_impl *impl, nir_alu_src *src, nir_alu_instr *copy)
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{
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nir_ssa_def *def = NULL;
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nir_alu_instr *user = nir_instr_as_alu(src->src.parent_instr);
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unsigned src_idx = src - user->src;
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assert(src_idx < nir_op_infos[user->op].num_inputs);
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unsigned num_comp = nir_ssa_alu_instr_src_components(user, src_idx);
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if (copy->op == nir_op_mov) {
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def = copy->src[0].src.ssa;
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for (unsigned i = 0; i < num_comp; i++)
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src->swizzle[i] = copy->src[0].swizzle[src->swizzle[i]];
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} else {
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def = copy->src[src->swizzle[0]].src.ssa;
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for (unsigned i = 1; i < num_comp; i++) {
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if (copy->src[src->swizzle[i]].src.ssa != def)
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return rewrite_to_vec(impl, user, copy);
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}
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for (unsigned i = 0; i < num_comp; i++)
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src->swizzle[i] = copy->src[src->swizzle[i]].swizzle[0];
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}
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nir_instr_rewrite_src_ssa(src->src.parent_instr, &src->src, def);
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return true;
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}
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static bool
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copy_propagate(nir_src *src, nir_alu_instr *copy)
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{
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if (!is_swizzleless_move(copy))
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return false;
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nir_instr_rewrite_src_ssa(src->parent_instr, src, copy->src[0].src.ssa);
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return true;
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}
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static bool
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copy_propagate_if(nir_src *src, nir_alu_instr *copy)
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{
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if (!is_swizzleless_move(copy))
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return false;
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nir_if_rewrite_condition_ssa(src->parent_if, src, copy->src[0].src.ssa);
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return true;
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}
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static bool
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copy_prop_instr(nir_function_impl *impl, nir_instr *instr)
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{
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if (instr->type != nir_instr_type_alu)
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return false;
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nir_alu_instr *mov = nir_instr_as_alu(instr);
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if (!nir_alu_instr_is_copy(mov))
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return false;
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bool progress = false;
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nir_foreach_use_safe(src, &mov->dest.dest.ssa) {
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if (src->parent_instr->type == nir_instr_type_alu)
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progress |= copy_propagate_alu(impl, container_of(src, nir_alu_src, src), mov);
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else
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progress |= copy_propagate(src, mov);
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}
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nir_foreach_if_use_safe(src, &mov->dest.dest.ssa)
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progress |= copy_propagate_if(src, mov);
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if (progress && nir_ssa_def_is_unused(&mov->dest.dest.ssa))
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nir_instr_remove(&mov->instr);
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return progress;
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}
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bool
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nir_copy_prop_impl(nir_function_impl *impl)
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{
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bool progress = false;
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nir_foreach_block(block, impl) {
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nir_foreach_instr_safe(instr, block) {
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progress |= copy_prop_instr(impl, instr);
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}
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}
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if (progress) {
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nir_metadata_preserve(impl, nir_metadata_block_index |
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nir_metadata_dominance);
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} else {
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nir_metadata_preserve(impl, nir_metadata_all);
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}
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return progress;
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}
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bool
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nir_copy_prop(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 && nir_copy_prop_impl(function->impl))
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progress = true;
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}
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return progress;
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}
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