From: Matt Turner <mattst88@gmail.com>
Date: Fri, 18 Apr 2014 17:01:41 +0000 (-0700)
Subject: i965/fs: Optimize SEL with the same sources into a MOV.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=fab92fa1cba4196a4947731e7105bd1494dfffc4;p=mesa.git

i965/fs: Optimize SEL with the same sources into a MOV.

instructions in affected programs:     474 -> 462 (-2.53%)

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
---

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 62868d11245..d7b969e46c5 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -2021,7 +2021,13 @@ fs_visitor::opt_algebraic()
          }
          break;
       case BRW_OPCODE_SEL:
-         if (inst->saturate && inst->src[1].file == IMM) {
+         if (inst->src[0].equals(inst->src[1])) {
+            inst->opcode = BRW_OPCODE_MOV;
+            inst->src[1] = reg_undef;
+            inst->predicate = BRW_PREDICATE_NONE;
+            inst->predicate_inverse = false;
+            progress = true;
+         } else if (inst->saturate && inst->src[1].file == IMM) {
             switch (inst->conditional_mod) {
             case BRW_CONDITIONAL_LE:
             case BRW_CONDITIONAL_L: