Mesa (master): vc4: Optimize out adds of 0.
Eric Anholt
anholt at kemper.freedesktop.org
Thu Oct 9 19:50:06 UTC 2014
Module: Mesa
Branch: master
Commit: 7e67ea994c34a6ebbaeb6a097036702c7a96496f
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=7e67ea994c34a6ebbaeb6a097036702c7a96496f
Author: Eric Anholt <eric at anholt.net>
Date: Thu Oct 9 15:10:52 2014 +0200
vc4: Optimize out adds of 0.
---
src/gallium/drivers/vc4/vc4_opt_algebraic.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/src/gallium/drivers/vc4/vc4_opt_algebraic.c b/src/gallium/drivers/vc4/vc4_opt_algebraic.c
index 435814e..c114458 100644
--- a/src/gallium/drivers/vc4/vc4_opt_algebraic.c
+++ b/src/gallium/drivers/vc4/vc4_opt_algebraic.c
@@ -99,6 +99,18 @@ replace_with_mov(struct vc4_compile *c, struct qinst *inst, struct qreg arg)
}
static bool
+add_replace_zero(struct vc4_compile *c,
+ struct qinst **defs,
+ struct qinst *inst,
+ int arg)
+{
+ if (!is_zero(c, defs, inst->src[arg]))
+ return false;
+ replace_with_mov(c, inst, inst->src[1 - arg]);
+ return true;
+}
+
+static bool
fmul_replace_zero(struct vc4_compile *c,
struct qinst **defs,
struct qinst *inst,
@@ -181,7 +193,21 @@ qir_opt_algebraic(struct vc4_compile *c)
}
break;
+ case QOP_ADD:
+ if (add_replace_zero(c, defs, inst, 0) ||
+ add_replace_zero(c, defs, inst, 1)) {
+ progress = true;
+ break;
+ }
+ break;
+
case QOP_FADD:
+ if (add_replace_zero(c, defs, inst, 0) ||
+ add_replace_zero(c, defs, inst, 1)) {
+ progress = true;
+ break;
+ }
+
/* FADD(a, FSUB(0, b)) -> FSUB(a, b) */
if (inst->src[1].file == QFILE_TEMP &&
defs[inst->src[1].index]->op == QOP_FSUB) {
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