From ebff5a5f465e725056d1601cad631574cf24678f Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Wed, 18 Apr 2012 00:59:12 -0400
Subject: [PATCH] arb1: use MAD opcode for SRCMOD_SIGN instead of a SUB+MUL
 pair.

---
 mojoshader.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/mojoshader.c b/mojoshader.c
index 68ced8d0..65daaa6d 100644
--- a/mojoshader.c
+++ b/mojoshader.c
@@ -3807,10 +3807,9 @@ static const char *make_ARB1_srcarg_string_in_buf(Context *ctx,
             premod_str = "-";
             // fall through.
         case SRCMOD_SIGN:
-            output_line(ctx, "SUB %s, %s, { 0.5, 0.5, 0.5, 0.5 };",
-                        regtype_str, buf);
-            output_line(ctx, "MUL %s, %s, { 2.0, 2.0, 2.0, 2.0 };",
-                        regtype_str, regtype_str);
+            output_line(ctx,
+                "MAD %s, %s, { 2.0, 2.0, 2.0, 2.0 }, { -1.0, -1.0, -1.0, -1.0 };",
+                regtype_str, buf);
             break;
 
         case SRCMOD_COMPLEMENT: