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/*
* Copyright © 2014 Broadcom
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
/**
* @file vc4_opt_copy_propagation.c
*
* This implements simple copy propagation for QIR without control flow.
*
* For each temp, it keeps a qreg of which source it was MOVed from, if it
* was. If we see that used later, we can just reuse the source value, since
* we know we don't have control flow, and we have SSA for our values so
* there's no killing to worry about.
*/
#include "vc4_qir.h"
bool
qir_opt_copy_propagation(struct vc4_compile *c)
{
bool progress = false;
bool debug = false;
list_for_each_entry(struct qinst, inst, &c->instructions, link) {
for (int i = 0; i < qir_get_op_nsrc(inst->op); i++) {
int index = inst->src[i].index;
if (inst->src[i].file == QFILE_TEMP &&
c->defs[index] &&
c->defs[index]->op == QOP_MOV &&
(c->defs[index]->src[0].file == QFILE_TEMP ||
c->defs[index]->src[0].file == QFILE_UNIF)) {
/* If it has a pack, it shouldn't be an SSA
* def.
*/
assert(!c->defs[index]->dst.pack);
if (debug) {
fprintf(stderr, "Copy propagate: ");
qir_dump_inst(c, inst);
fprintf(stderr, "\n");
}
inst->src[i] = c->defs[index]->src[0];
if (debug) {
fprintf(stderr, "to: ");
qir_dump_inst(c, inst);
fprintf(stderr, "\n");
}
progress = true;
}
}
}
return progress;
}
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