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Add UMULH()

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This function/macro returns the high half of the unsigned 64-bit
product of two unsigned 32-bit operands.

Originally committed as revision 21463 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2010-01-26 18:05:55 +00:00
parent 900479bb74
commit f2c694af28
1 changed files with 6 additions and 0 deletions
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6
libavcodec/mathops.h
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@ -53,6 +53,12 @@ static av_always_inline int MULH(int a, int b){
} }
#endif #endif
#ifndef UMULH
static av_always_inline unsigned UMULH(unsigned a, unsigned b){
return ((uint64_t)(a) * (uint64_t)(b))>>32;
}
#endif
#ifndef MUL64 #ifndef MUL64
# define MUL64(a,b) ((int64_t)(a) * (int64_t)(b)) # define MUL64(a,b) ((int64_t)(a) * (int64_t)(b))
#endif #endif