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i965/fs: Eliminate null-dst instructions without side-effects.

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Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Matt Turner 2014-08-22 11:01:13 -07:00
parent 7452f18b22
commit 3759a89ad3
1 changed files with 11 additions and 0 deletions
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11
src/mesa/drivers/dri/i965/brw_fs_dead_code_eliminate.cpp
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@ -85,6 +85,17 @@ fs_visitor::dead_code_eliminate()
}
}
if ((inst->opcode != BRW_OPCODE_IF &&
inst->opcode != BRW_OPCODE_WHILE) &&
inst->dst.is_null() &&
!inst->has_side_effects() &&
!inst->writes_flag() &&
!inst->writes_accumulator) {
inst->opcode = BRW_OPCODE_NOP;
progress = true;
continue;
}
if (inst->dst.file == GRF) {
if (!inst->is_partial_write()) {
int var = live_intervals->var_from_reg(inst->dst);