diff options
| author | BERO <bero@geocities.co.jp> | 2003-05-14 15:12:13 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2003-05-14 15:12:13 +0000 |
| commit | d4961b35236beb67785410473442f5923ac8a488 (patch) | |
| tree | 7b8474ce797d6e8b33ef0b3e6c19ff5b532ea375 /libavcodec/common.h | |
| parent | b82cdc727855fc11f0110c46c39eadd00009ebc0 (diff) | |
| download | ffmpeg-d4961b35236beb67785410473442f5923ac8a488.tar.gz | |
fastdiv patch by (BERO <bero at geocities dot co dot jp>) with fixes & cleanup by me
Originally committed as revision 1879 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/common.h')
| -rw-r--r-- | libavcodec/common.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/libavcodec/common.h b/libavcodec/common.h index 1a8202d709..092026d78e 100644 --- a/libavcodec/common.h +++ b/libavcodec/common.h @@ -197,6 +197,25 @@ inline void dprintf(const char* fmt,...) {} #define FFMAX(a,b) ((a) > (b) ? (a) : (b)) #define FFMIN(a,b) ((a) > (b) ? (b) : (a)) +extern const uint32_t inverse[256]; + +#ifdef ARCH_X86 +# define FASTDIV(a,b) \ + ({\ + int ret,dmy;\ + asm volatile(\ + "mull %3"\ + :"=d"(ret),"=a"(dmy)\ + :"1"(a),"g"(inverse[b])\ + );\ + ret;\ + }) +#elif defined(CONFIG_FASTDIV) +# define FASTDIV(a,b) ((uint32_t)((((uint64_t)a)*inverse[b])>>32)) +#else +# define FASTDIV(a,b) ((a)/(b)) +#endif + #ifdef ARCH_X86 // avoid +32 for shift optimization (gcc should do that ...) static inline int32_t NEG_SSR32( int32_t a, int8_t s){ |