Mesa (master): vc4: Optimize SF(ITOF(x)) -> SF(x).
Eric Anholt
anholt at kemper.freedesktop.org
Thu Oct 9 09:05:57 UTC 2014
Module: Mesa
Branch: master
Commit: 5a1352289862a9bd695a15009c69cad54727c66b
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=5a1352289862a9bd695a15009c69cad54727c66b
Author: Eric Anholt <eric at anholt.net>
Date: Thu Oct 9 09:36:03 2014 +0200
vc4: Optimize SF(ITOF(x)) -> SF(x).
This is a common production of st_glsl_to_tgsi, because CMP takes a float
argument.
---
src/gallium/drivers/vc4/vc4_opt_algebraic.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/src/gallium/drivers/vc4/vc4_opt_algebraic.c b/src/gallium/drivers/vc4/vc4_opt_algebraic.c
index 4155e72..e247f30 100644
--- a/src/gallium/drivers/vc4/vc4_opt_algebraic.c
+++ b/src/gallium/drivers/vc4/vc4_opt_algebraic.c
@@ -91,6 +91,22 @@ qir_opt_algebraic(struct vc4_compile *c)
defs[inst->dst.index] = inst;
switch (inst->op) {
+ case QOP_SF:
+ /* SF just looks at the sign bit, or whether all the
+ * bits are 0. This is preserved across an itof
+ * transformation.
+ */
+ if (inst->src[0].file == QFILE_TEMP &&
+ defs[inst->src[0].index]->op == QOP_ITOF) {
+ dump_from(c, inst);
+ inst->src[0] =
+ defs[inst->src[0].index]->src[0];
+ progress = true;
+ dump_to(c, inst);
+ break;
+ }
+ break;
+
case QOP_SEL_X_Y_ZS:
case QOP_SEL_X_Y_ZC:
case QOP_SEL_X_Y_NS:
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