Mesa (master): i965/fs: Optimize LRP with x == y into a MOV.
Matt Turner
mattst88 at kemper.freedesktop.org
Tue Jan 21 22:26:43 UTC 2014
Module: Mesa
Branch: master
Commit: bf0773aeca86669371d99eadb928c6dc92d5840a
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=bf0773aeca86669371d99eadb928c6dc92d5840a
Author: Matt Turner <mattst88 at gmail.com>
Date: Thu Jan 9 20:57:36 2014 -0800
i965/fs: Optimize LRP with x == y into a MOV.
total instructions in shared programs: 1487331 -> 1485988 (-0.09%)
instructions in affected programs: 45638 -> 44295 (-2.94%)
GAINED: 7
LOST: 0
Reviewed-by: Jordan Justen <jordan.l.justen at intel.com>
---
src/mesa/drivers/dri/i965/brw_fs.cpp | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 4a96126..78ddf0d 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -2000,6 +2000,16 @@ fs_visitor::opt_algebraic()
break;
}
break;
+ case BRW_OPCODE_LRP:
+ if (inst->src[1].equals(inst->src[2])) {
+ inst->opcode = BRW_OPCODE_MOV;
+ inst->src[0] = inst->src[1];
+ inst->src[1] = reg_undef;
+ inst->src[2] = reg_undef;
+ progress = true;
+ break;
+ }
+ break;
case BRW_OPCODE_SEL:
if (inst->saturate && inst->src[1].file == IMM) {
switch (inst->conditional_mod) {
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