From: Eric Anholt <eric@anholt.net>
Date: Mon, 19 Dec 2011 17:20:57 +0000 (-0800)
Subject: i965/fs: Allow constant propagation into IF with embedded compare.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=069901e2f5a8f4a58047d25335f2526f1acc7234;p=mesa.git

i965/fs: Allow constant propagation into IF with embedded compare.

This saves a couple of instructions on most programs with control
flow.  More interestingly, 6 shaders from unigine sanctuary now fit
into 16-wide without register spilling.
---

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 8ca4a8735d0..b6aa60e84f3 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -1144,6 +1144,7 @@ fs_visitor::propagate_constants()
 	       break;
 
 	    case BRW_OPCODE_CMP:
+	    case BRW_OPCODE_IF:
 	       if (i == 1) {
 		  scan_inst->src[i] = inst->src[0];
 		  progress = true;