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| author | Clément Bœsch <ubitux@gmail.com> | 2013-05-12 13:29:23 +0200 |
|---|---|---|
| committer | Clément Bœsch <ubitux@gmail.com> | 2013-05-13 17:53:16 +0200 |
| commit | b3c263e20925628eabf785afae5a9d7cc5d8bb4d (patch) | |
| tree | cee3a515805ae61682c42d691ce31d9097d257ce | |
| parent | 45150f90e7dcb12a07780244c1cc5efac5cb8f53 (diff) | |
| download | ffmpeg-b3c263e20925628eabf785afae5a9d7cc5d8bb4d.tar.gz | |
lavu/common: make FF_CEIL_RSHIFT faster when shift is constant.
See "[PATCH] lavfi/lut: use FF_CEIL_RSHIFT for chroma w/h rounding."
thread for more information.
| -rw-r--r-- | libavutil/common.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/libavutil/common.h b/libavutil/common.h index 9091070a01..c7c32fd363 100644 --- a/libavutil/common.h +++ b/libavutil/common.h @@ -49,7 +49,8 @@ /* assume b>0 */ #define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b)) /* assume a>0 and b>0 */ -#define FF_CEIL_RSHIFT(a,b) (-((-(a)) >> (b))) +#define FF_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \ + : ((a) + (1<<(b)) - 1) >> (b)) #define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b)) #define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b)) #define FFABS(a) ((a) >= 0 ? (a) : (-(a))) |