[Ffmpeg-cvslog] CVS: ffmpeg/libavcodec mjpeg.c,1.127,1.128

[Michael Niedermayer CVS]

Update of /cvsroot/ffmpeg/ffmpeg/libavcodec
In directory mail:/var2/tmp/cvs-serv14050

Modified Files:
	mjpeg.c 
Log Message:
avoid hard to predict branch (idea by arpi)


Index: mjpeg.c
===================================================================
RCS file: /cvsroot/ffmpeg/ffmpeg/libavcodec/mjpeg.c,v
retrieving revision 1.127
retrieving revision 1.128
diff -u -d -r1.127 -r1.128
--- mjpeg.c	29 Mar 2006 21:11:57 -0000	1.127
+++ mjpeg.c	31 Mar 2006 16:50:43 -0000	1.128
@@ -1288,11 +1288,10 @@
             code &= 0xf;
 
             UPDATE_CACHE(re, &s->gb)
-
-            if ((int32_t)GET_CACHE(re,&s->gb)<0) { //MSB=1
-                level =   NEG_USR32( GET_CACHE(re,&s->gb),code);
-            } else {
-                level = - NEG_USR32(~GET_CACHE(re,&s->gb),code);
+            {
+                int cache=GET_CACHE(re,gb);
+                int sign=(~cache)>>31;
+                level = (NEG_USR32(sign ^ cache,code) ^ sign) + (sign&1) ;
             }
 
             LAST_SKIP_BITS(re, &s->gb, code)