small optimization

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@7327 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

diff --git a/libavcodec/vp6.c b/libavcodec/vp6.c
index b7ff004cc5d2dfbd009a5b3d3d693842352b7551..bc0ce817b16b6bf23f509431565ea9bcf3d7fb8d 100644 (file)
--- a/libavcodec/vp6.c
+++ b/libavcodec/vp6.c
@@ -343,7 +343,7 @@ static int vp6_block_variance(uint8_t *src, int stride)
         }
         src += 2*stride;
     }
-    return (16*square_sum - sum*sum) / (16*16);
+    return (16*square_sum - sum*sum) >> 8;
 }
 
 static void vp6_filter_hv2(vp56_context_t *s, uint8_t *dst, uint8_t *src,