165 lines
6.0 KiB
C++
165 lines
6.0 KiB
C++
/*
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* Copyright © 2013 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 "brw_fs.h"
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#include "brw_fs_live_variables.h"
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#include "brw_cfg.h"
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using namespace brw;
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/** @file brw_fs_saturate_propagation.cpp
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*
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* Implements a pass that propagates the SAT modifier from a MOV.SAT into the
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* instruction that produced the source of the MOV.SAT, thereby allowing the
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* MOV's src and dst to be coalesced and the MOV removed.
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*
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* For instance,
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*
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* ADD tmp, src0, src1
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* MOV.SAT dst, tmp
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*
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* would be transformed into
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*
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* ADD.SAT tmp, src0, src1
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* MOV dst, tmp
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*/
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static bool
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opt_saturate_propagation_local(const fs_live_variables &live, bblock_t *block)
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{
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bool progress = false;
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int ip = block->end_ip + 1;
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foreach_inst_in_block_reverse(fs_inst, inst, block) {
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ip--;
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if (inst->opcode != BRW_OPCODE_MOV ||
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!inst->saturate ||
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inst->dst.file != VGRF ||
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inst->dst.type != inst->src[0].type ||
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inst->src[0].file != VGRF ||
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inst->src[0].abs)
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continue;
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int src_var = live.var_from_reg(inst->src[0]);
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int src_end_ip = live.end[src_var];
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bool interfered = false;
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foreach_inst_in_block_reverse_starting_from(fs_inst, scan_inst, inst) {
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if (scan_inst->exec_size == inst->exec_size &&
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regions_overlap(scan_inst->dst, scan_inst->size_written,
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inst->src[0], inst->size_read(0))) {
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if (scan_inst->is_partial_write() ||
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(scan_inst->dst.type != inst->dst.type &&
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!scan_inst->can_change_types()))
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break;
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if (scan_inst->saturate) {
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inst->saturate = false;
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progress = true;
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} else if (src_end_ip == ip || inst->dst.equals(inst->src[0])) {
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if (scan_inst->can_do_saturate()) {
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if (scan_inst->dst.type != inst->dst.type) {
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scan_inst->dst.type = inst->dst.type;
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for (int i = 0; i < scan_inst->sources; i++) {
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scan_inst->src[i].type = inst->dst.type;
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}
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}
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if (inst->src[0].negate) {
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if (scan_inst->opcode == BRW_OPCODE_MUL) {
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scan_inst->src[0].negate = !scan_inst->src[0].negate;
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inst->src[0].negate = false;
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} else if (scan_inst->opcode == BRW_OPCODE_MAD) {
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for (int i = 0; i < 2; i++) {
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if (scan_inst->src[i].file == IMM) {
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brw_negate_immediate(scan_inst->src[i].type,
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&scan_inst->src[i].as_brw_reg());
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} else {
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scan_inst->src[i].negate = !scan_inst->src[i].negate;
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}
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}
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inst->src[0].negate = false;
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} else if (scan_inst->opcode == BRW_OPCODE_ADD) {
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if (scan_inst->src[1].file == IMM) {
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if (!brw_negate_immediate(scan_inst->src[1].type,
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&scan_inst->src[1].as_brw_reg())) {
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break;
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}
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} else {
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scan_inst->src[1].negate = !scan_inst->src[1].negate;
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}
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scan_inst->src[0].negate = !scan_inst->src[0].negate;
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inst->src[0].negate = false;
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} else {
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break;
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}
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}
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scan_inst->saturate = true;
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inst->saturate = false;
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progress = true;
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}
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}
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break;
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}
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for (int i = 0; i < scan_inst->sources; i++) {
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if (scan_inst->src[i].file == VGRF &&
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scan_inst->src[i].nr == inst->src[0].nr &&
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scan_inst->src[i].offset / REG_SIZE ==
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inst->src[0].offset / REG_SIZE) {
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if (scan_inst->opcode != BRW_OPCODE_MOV ||
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!scan_inst->saturate ||
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scan_inst->src[0].abs ||
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scan_inst->src[0].negate ||
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scan_inst->src[0].abs != inst->src[0].abs ||
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scan_inst->src[0].negate != inst->src[0].negate) {
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interfered = true;
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break;
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}
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}
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}
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if (interfered)
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break;
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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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fs_visitor::opt_saturate_propagation()
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{
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const fs_live_variables &live = live_analysis.require();
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bool progress = false;
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foreach_block (block, cfg) {
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progress = opt_saturate_propagation_local(live, block) || progress;
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}
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/* Live intervals are still valid. */
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return progress;
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}
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