From: Matt Turner <mattst88@gmail.com>
Date: Mon, 28 Oct 2013 02:34:48 +0000 (-0700)
Subject: i965/fs: Optimize OR with identical sources into a MOV.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a8f76d829bdcdb5f238ba6206f1b768098745022;p=mesa.git

i965/fs: Optimize OR with identical sources into a MOV.

Helps a lot of Steam games.

total instructions in shared programs: 1409360 -> 1409124 (-0.02%)
instructions in affected programs:     20842 -> 20606 (-1.13%)

Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
---

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 236e86c7cc2..2350cd097c5 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -1872,6 +1872,14 @@ fs_visitor::opt_algebraic()
             break;
          }
          break;
+      case BRW_OPCODE_OR:
+         if (inst->src[0].equals(inst->src[1])) {
+            inst->opcode = BRW_OPCODE_MOV;
+            inst->src[1] = reg_undef;
+            progress = true;
+            break;
+         }
+         break;
       default:
 	 break;
       }