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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_algebraic.c
*
* This is the optimization pass for miscellaneous changes to instructions
* where we can simplify the operation by some knowledge about the specific
* operations.
*
* Mostly this will be a matter of turning things into MOVs so that they can
* later be copy-propagated out.
*/
#include "vc4_qir.h"
bool
qir_opt_algebraic(struct qcompile *c)
{
bool progress = false;
struct simple_node *node;
bool debug = false;
foreach(node, &c->instructions) {
struct qinst *inst = (struct qinst *)node;
switch (inst->op) {
case QOP_CMP:
/* Turn "dst = (a < 0) ? b : b)" into "dst = b" */
if (qir_reg_equals(inst->src[1], inst->src[2])) {
if (debug) {
fprintf(stderr, "optimizing: ");
qir_dump_inst(inst);
fprintf(stderr, "\n");
}
inst->op = QOP_MOV;
inst->src[0] = inst->src[1];
inst->src[1] = c->undef;
progress = true;
if (debug) {
fprintf(stderr, "to: ");
qir_dump_inst(inst);
fprintf(stderr, "\n");
}
}
break;
default:
break;
}
}
return progress;
}
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