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i965/fs: Clear variable from live-set if it's completely overwritten.

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One program affected:

instructions in affected programs:     246 -> 244 (-0.81%)

Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Matt Turner
2014-04-14 11:17:13 -07:00
parent f34f39330b
commit 18d12336b9
1 changed files with 9 additions and 0 deletions
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src/mesa/drivers/dri/i965/brw_fs_dead_code_eliminate.cpp
+9
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@@ -85,6 +85,15 @@ fs_visitor::dead_code_eliminate()
}
}
if (inst->dst.file == GRF) {
if (!inst->is_partial_write()) {
int var = live_intervals->var_from_vgrf[inst->dst.reg];
for (int i = 0; i < inst->regs_written; i++) {
BITSET_CLEAR(live, var + inst->dst.reg_offset + i);
}
}
}
for (int i = 0; i < 3; i++) {
if (inst->src[i].file == GRF) {
int var = live_intervals->var_from_vgrf[inst->src[i].reg];