From: Justin Ruggles <justin.ruggles@gmail.com>
Date: Fri, 17 Feb 2012 02:51:03 +0000 (-0500)
Subject: ttadec: use branchless unsigned-to-signed unfolding
X-Git-Tag: v9_beta1~2916
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f2a4559c77ebce36b575e75fad102d2e9f02bb5a;p=platform%2Fupstream%2Flibav.git

ttadec: use branchless unsigned-to-signed unfolding
---

diff --git a/libavcodec/tta.c b/libavcodec/tta.c
index db9c1b2..6f4d161 100644
--- a/libavcodec/tta.c
+++ b/libavcodec/tta.c
@@ -396,8 +396,7 @@ static int tta_decode_frame(AVCodecContext *avctx, void *data,
         }
 
         // extract coded value
-#define UNFOLD(x) (((x)&1) ? (++(x)>>1) : (-(x)>>1))
-        *p = UNFOLD(value);
+        *p = 1 + ((value >> 1) ^ ((value & 1) - 1));
 
         // run hybrid filter
         ttafilter_process(filter, p);