342 lines
9.1 KiB
C
342 lines
9.1 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 <main/imports.h>
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/**
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* SSA-based copy propagation
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*/
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static bool is_move(nir_alu_instr *instr)
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{
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if (instr->op != nir_op_fmov &&
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instr->op != nir_op_imov)
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return false;
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if (instr->dest.saturate)
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return false;
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/* we handle modifiers in a separate pass */
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if (instr->src[0].abs || instr->src[0].negate)
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return false;
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if (!instr->src[0].src.is_ssa)
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return false;
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return true;
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}
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static bool is_vec(nir_alu_instr *instr)
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{
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for (unsigned i = 0; i < nir_op_infos[instr->op].num_inputs; i++) {
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if (!instr->src[i].src.is_ssa)
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return false;
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/* we handle modifiers in a separate pass */
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if (instr->src[i].abs || instr->src[i].negate)
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return false;
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}
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return instr->op == nir_op_vec2 ||
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instr->op == nir_op_vec3 ||
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instr->op == nir_op_vec4;
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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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if (is_move(instr)) {
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for (unsigned i = 0; i < 4; i++) {
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if (!((instr->dest.write_mask >> i) & 1))
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break;
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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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return true;
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} else if (is_vec(instr)) {
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nir_ssa_def *def = NULL;
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for (unsigned i = 0; i < nir_op_infos[instr->op].num_inputs; i++) {
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if (instr->src[i].swizzle[0] != i)
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return false;
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if (def == NULL) {
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def = instr->src[i].src.ssa;
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} else if (instr->src[i].src.ssa != def) {
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return false;
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}
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}
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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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copy_prop_src(nir_src *src, nir_instr *parent_instr, nir_if *parent_if,
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unsigned num_components)
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{
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if (!src->is_ssa) {
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if (src->reg.indirect)
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return copy_prop_src(src->reg.indirect, parent_instr, parent_if, 1);
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return false;
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}
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nir_instr *src_instr = src->ssa->parent_instr;
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if (src_instr->type != nir_instr_type_alu)
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return false;
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nir_alu_instr *alu_instr = nir_instr_as_alu(src_instr);
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if (!is_swizzleless_move(alu_instr))
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return false;
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if (alu_instr->src[0].src.ssa->num_components != num_components)
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return false;
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if (parent_instr) {
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nir_instr_rewrite_src(parent_instr, src,
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nir_src_for_ssa(alu_instr->src[0].src.ssa));
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} else {
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assert(src == &parent_if->condition);
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nir_if_rewrite_condition(parent_if,
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nir_src_for_ssa(alu_instr->src[0].src.ssa));
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}
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return true;
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}
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static bool
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copy_prop_alu_src(nir_alu_instr *parent_alu_instr, unsigned index)
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{
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nir_alu_src *src = &parent_alu_instr->src[index];
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if (!src->src.is_ssa) {
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if (src->src.reg.indirect)
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return copy_prop_src(src->src.reg.indirect, &parent_alu_instr->instr,
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NULL, 1);
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return false;
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}
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nir_instr *src_instr = src->src.ssa->parent_instr;
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if (src_instr->type != nir_instr_type_alu)
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return false;
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nir_alu_instr *alu_instr = nir_instr_as_alu(src_instr);
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if (!is_move(alu_instr) && !is_vec(alu_instr))
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return false;
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nir_ssa_def *def;
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unsigned new_swizzle[4] = {0, 0, 0, 0};
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if (alu_instr->op == nir_op_fmov ||
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alu_instr->op == nir_op_imov) {
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for (unsigned i = 0; i < 4; i++)
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new_swizzle[i] = alu_instr->src[0].swizzle[src->swizzle[i]];
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def = alu_instr->src[0].src.ssa;
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} else {
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def = NULL;
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for (unsigned i = 0; i < 4; i++) {
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if (!nir_alu_instr_channel_used(parent_alu_instr, index, i))
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continue;
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nir_ssa_def *new_def = alu_instr->src[src->swizzle[i]].src.ssa;
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if (def == NULL)
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def = new_def;
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else {
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if (def != new_def)
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return false;
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}
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new_swizzle[i] = alu_instr->src[src->swizzle[i]].swizzle[0];
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}
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}
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for (unsigned i = 0; i < 4; i++)
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src->swizzle[i] = new_swizzle[i];
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nir_instr_rewrite_src(&parent_alu_instr->instr, &src->src,
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nir_src_for_ssa(def));
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return true;
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}
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static bool
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copy_prop_dest(nir_dest *dest, nir_instr *instr)
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{
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if (!dest->is_ssa && dest->reg.indirect)
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return copy_prop_src(dest->reg.indirect, instr, NULL, 1);
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return false;
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}
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static bool
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copy_prop_deref_var(nir_instr *instr, nir_deref_var *deref_var)
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{
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if (!deref_var)
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return false;
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bool progress = false;
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for (nir_deref *deref = deref_var->deref.child;
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deref; deref = deref->child) {
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if (deref->deref_type != nir_deref_type_array)
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continue;
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nir_deref_array *arr = nir_deref_as_array(deref);
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if (arr->deref_array_type != nir_deref_array_type_indirect)
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continue;
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while (copy_prop_src(&arr->indirect, instr, NULL, 1))
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progress = true;
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}
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return progress;
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}
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static bool
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copy_prop_instr(nir_instr *instr)
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{
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bool progress = false;
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switch (instr->type) {
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case nir_instr_type_alu: {
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nir_alu_instr *alu_instr = nir_instr_as_alu(instr);
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for (unsigned i = 0; i < nir_op_infos[alu_instr->op].num_inputs; i++)
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while (copy_prop_alu_src(alu_instr, i))
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progress = true;
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while (copy_prop_dest(&alu_instr->dest.dest, instr))
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progress = true;
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return progress;
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}
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case nir_instr_type_tex: {
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nir_tex_instr *tex = nir_instr_as_tex(instr);
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for (unsigned i = 0; i < tex->num_srcs; i++) {
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unsigned num_components = nir_tex_instr_src_size(tex, i);
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while (copy_prop_src(&tex->src[i].src, instr, NULL, num_components))
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progress = true;
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}
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if (copy_prop_deref_var(instr, tex->texture))
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progress = true;
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if (copy_prop_deref_var(instr, tex->sampler))
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progress = true;
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while (copy_prop_dest(&tex->dest, instr))
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progress = true;
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return progress;
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}
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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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for (unsigned i = 0;
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i < nir_intrinsic_infos[intrin->intrinsic].num_srcs; i++) {
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unsigned num_components =
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nir_intrinsic_infos[intrin->intrinsic].src_components[i];
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if (!num_components)
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num_components = intrin->num_components;
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while (copy_prop_src(&intrin->src[i], instr, NULL, num_components))
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progress = true;
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}
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for (unsigned i = 0;
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i < nir_intrinsic_infos[intrin->intrinsic].num_variables; i++) {
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if (copy_prop_deref_var(instr, intrin->variables[i]))
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progress = true;
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}
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if (nir_intrinsic_infos[intrin->intrinsic].has_dest) {
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while (copy_prop_dest(&intrin->dest, instr))
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progress = true;
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}
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return progress;
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}
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case nir_instr_type_phi: {
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nir_phi_instr *phi = nir_instr_as_phi(instr);
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assert(phi->dest.is_ssa);
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unsigned num_components = phi->dest.ssa.num_components;
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nir_foreach_phi_src(src, phi) {
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while (copy_prop_src(&src->src, instr, NULL, num_components))
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progress = true;
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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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copy_prop_if(nir_if *if_stmt)
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{
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return copy_prop_src(&if_stmt->condition, NULL, if_stmt, 1);
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}
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static 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(instr, block) {
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if (copy_prop_instr(instr))
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progress = true;
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}
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nir_if *if_stmt = nir_block_get_following_if(block);
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if (if_stmt && copy_prop_if(if_stmt))
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progress = true;
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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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}
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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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