Mesa (master): vc4: Optimize out silly SUBs of 0.
Eric Anholt
anholt at kemper.freedesktop.org
Mon Sep 29 22:02:07 UTC 2014
Module: Mesa
Branch: master
Commit: 76cd9955d96c1b0a13905e255571eb35b3aa2a99
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=76cd9955d96c1b0a13905e255571eb35b3aa2a99
Author: Eric Anholt <eric at anholt.net>
Date: Wed Sep 24 21:57:06 2014 -0700
vc4: Optimize out silly SUBs of 0.
Drops instructions on vs-temp-array-mat4-index-col-row-wr.shader_test,
which I was looking at because it's failing to register allocate.
---
src/gallium/drivers/vc4/vc4_opt_algebraic.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/src/gallium/drivers/vc4/vc4_opt_algebraic.c b/src/gallium/drivers/vc4/vc4_opt_algebraic.c
index b5cde05..f88a5c1 100644
--- a/src/gallium/drivers/vc4/vc4_opt_algebraic.c
+++ b/src/gallium/drivers/vc4/vc4_opt_algebraic.c
@@ -117,6 +117,17 @@ qir_opt_algebraic(struct vc4_compile *c)
}
break;
+ case QOP_FSUB:
+ case QOP_SUB:
+ if (is_zero(c, defs, inst->src[1])) {
+ dump_from(c, inst);
+ inst->op = QOP_MOV;
+ inst->src[1] = c->undef;
+ progress = true;
+ dump_to(c, inst);
+ }
+ break;
+
default:
break;
}
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