From 3788e661f1e50558b92544c8e2d373aa553e9124 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Fri, 24 Apr 2009 00:26:49 +0000 Subject: [PATCH] Optimize sign handling in get_symbol(). Originally committed as revision 18672 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/ffv1.c | 6 ++---- libavcodec/snow.c | 6 ++---- 2 files changed, 4 insertions(+), 8 deletions(-) diff --git a/libavcodec/ffv1.c b/libavcodec/ffv1.c index 9eef531d59..62b12ede16 100644 --- a/libavcodec/ffv1.c +++ b/libavcodec/ffv1.c @@ -258,10 +258,8 @@ static inline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed){ a += a + get_rac(c, state+22 + i); //22..31 } - if(is_signed && get_rac(c, state+11 + e)) //11..21 - return -a; - else - return a; + e= -(is_signed && get_rac(c, state+11 + e)); //11..21 + return (a^e)-e; } } diff --git a/libavcodec/snow.c b/libavcodec/snow.c index 5d9577bc03..995c1a2024 100644 --- a/libavcodec/snow.c +++ b/libavcodec/snow.c @@ -665,10 +665,8 @@ static inline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed){ a += a + get_rac(c, state+22 + FFMIN(i,9)); //22..31 } - if(is_signed && get_rac(c, state+11 + FFMIN(e,10))) //11..21 - return -a; - else - return a; + e= -(is_signed && get_rac(c, state+11 + FFMIN(e,10))); //11..21 + return (a^e)-e; } }