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i965: Don't dead-code eliminate instructions that write to the accumulator.

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Reviewed-by: Paul Berry <stereotype441@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Matt Turner 2013-09-19 19:31:31 -07:00
parent 014cce3dc4
commit 92dc16c3e2
2 changed files with 30 additions and 2 deletions
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16
src/mesa/drivers/dri/i965/brw_fs.cpp
View file

@ -1846,7 +1846,21 @@ fs_visitor::dead_code_eliminate()
if (inst->dst.file == GRF) {
assert(this->virtual_grf_end[inst->dst.reg] >= pc);
if (this->virtual_grf_end[inst->dst.reg] == pc) {
inst->remove();
/* Don't dead code eliminate instructions that write to the
* accumulator as a side-effect. Instead just set the destination
* to the null register to free it.
*/
switch (inst->opcode) {
case BRW_OPCODE_ADDC:
case BRW_OPCODE_SUBB:
case BRW_OPCODE_MACH:
inst->dst.file = ARF;
inst->dst.reg = BRW_ARF_NULL;
break;
default:
inst->remove();
break;
}
progress = true;
}
}

16
src/mesa/drivers/dri/i965/brw_vec4.cpp
View file

@ -314,7 +314,21 @@ vec4_visitor::dead_code_eliminate()
if (inst->dst.file == GRF) {
assert(this->virtual_grf_end[inst->dst.reg] >= pc);
if (this->virtual_grf_end[inst->dst.reg] == pc) {
inst->remove();
/* Don't dead code eliminate instructions that write to the
* accumulator as a side-effect. Instead just set the destination
* to the null register to free it.
*/
switch (inst->opcode) {
case BRW_OPCODE_ADDC:
case BRW_OPCODE_SUBB:
case BRW_OPCODE_MACH:
inst->dst.file = ARF;
inst->dst.reg = BRW_ARF_NULL;
break;
default:
inst->remove();
break;
}
progress = true;
}
}