From: Eric Anholt <eric@anholt.net>
Date: Tue, 5 Oct 2010 17:25:22 +0000 (-0700)
Subject: i965: Also do constant propagation for the second operand of CMP.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=634abbf7b2e6ea21db30aafc0de9472ee31d4173;p=mesa.git

i965: Also do constant propagation for the second operand of CMP.

We could do the first operand as well by flipping the comparison, but
this covered several CMPs in code I was looking at.
---

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 0c9f17f8fdc..914141a3978 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -2607,6 +2607,11 @@ fs_visitor::propagate_constants()
 		  scan_inst->src[1] = inst->src[0];
 	       }
 	       break;
+	    case BRW_OPCODE_CMP:
+	       if (i == 1) {
+		  scan_inst->src[i] = inst->src[0];
+		  progress = true;
+	       }
 	    }
 	 }