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lavu/common: make FF_CEIL_RSHIFT faster when shift is constant.

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See "[PATCH] lavfi/lut: use FF_CEIL_RSHIFT for chroma w/h rounding."
thread for more information.
This commit is contained in:
Clément Bœsch 2013-05-12 13:29:23 +02:00
parent 45150f90e7
commit b3c263e209
1 changed files with 2 additions and 1 deletions
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3
libavutil/common.h
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@ -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)))