Mesa (master): i965/fs: Perform CSE on MAD instructions with final arguments switched.
Matt Turner
mattst88 at kemper.freedesktop.org
Thu Oct 30 04:34:10 UTC 2014
Module: Mesa
Branch: master
Commit: b65bd9583b9fe0080b5664df2a80d2084499e3c2
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=b65bd9583b9fe0080b5664df2a80d2084499e3c2
Author: Matt Turner <mattst88 at gmail.com>
Date: Sun Oct 26 10:08:40 2014 -0700
i965/fs: Perform CSE on MAD instructions with final arguments switched.
Multiplication is commutative.
instructions in affected programs: 48314 -> 47954 (-0.75%)
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
---
src/mesa/drivers/dri/i965/brw_fs_cse.cpp | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/src/mesa/drivers/dri/i965/brw_fs_cse.cpp b/src/mesa/drivers/dri/i965/brw_fs_cse.cpp
index 8012001..5fdbf46 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_cse.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_cse.cpp
@@ -128,7 +128,11 @@ operands_match(fs_inst *a, fs_inst *b)
fs_reg *xs = a->src;
fs_reg *ys = b->src;
- if (!is_expression_commutative(a->opcode)) {
+ if (a->opcode == BRW_OPCODE_MAD) {
+ return xs[0].equals(ys[0]) &&
+ ((xs[1].equals(ys[1]) && xs[2].equals(ys[2])) ||
+ (xs[2].equals(ys[1]) && xs[1].equals(ys[2])));
+ } else if (!is_expression_commutative(a->opcode)) {
bool match = true;
for (int i = 0; i < a->sources; i++) {
if (!xs[i].equals(ys[i])) {
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