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.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 0c9f17f8fd..914141a397 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;
+	       }
 	    }
 	 }