Mesa (master): freedreno/ir3: only tex instructions have wrmask
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Tue Nov 12 22:32:46 UTC 2019
Module: Mesa
Branch: master
Commit: 4bb697d938d17bbdd5124db0102d97fb9ead2229
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=4bb697d938d17bbdd5124db0102d97fb9ead2229
Author: Rob Clark <robdclark at chromium.org>
Date: Fri Nov 1 15:17:22 2019 -0700
freedreno/ir3: only tex instructions have wrmask
At the ir3 level, we would assume that we could use wrmask to mask
off other components of an instruction returning a vecN when they are
not used. Which would let RA use components not written for other live
values. But this is only true for tex instructions.
Signed-off-by: Rob Clark <robdclark at chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg at google.com>
Reviewed-by: Eric Anholt <eric at anholt.net>
---
src/freedreno/ir3/ir3_depth.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/src/freedreno/ir3/ir3_depth.c b/src/freedreno/ir3/ir3_depth.c
index bdd00693104..4bbd1e56d7c 100644
--- a/src/freedreno/ir3/ir3_depth.c
+++ b/src/freedreno/ir3/ir3_depth.c
@@ -177,13 +177,10 @@ remove_unused_by_block(struct ir3_block *block)
if (instr->flags & IR3_INSTR_UNUSED) {
if (instr->opc == OPC_META_SPLIT) {
struct ir3_instruction *src = ssa(instr->regs[1]);
- /* leave inputs alone.. we can't optimize out components of
- * an input, since the hw is still going to be writing all
- * of the components, and we could end up in a situation
- * where multiple inputs overlap.
+ /* tex (cat5) instructions have a writemask, so we can
+ * mask off unused components. Other instructions do not.
*/
- if ((src->opc != OPC_META_INPUT) &&
- (src->regs[0]->wrmask > 1)) {
+ if (is_tex(src) && (src->regs[0]->wrmask > 1)) {
src->regs[0]->wrmask &= ~(1 << instr->split.off);
/* prune no-longer needed right-neighbors. We could
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