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| author | Måns Rullgård <mans@mansr.com> | 2010-01-26 18:05:55 +0000 |
|---|---|---|
| committer | Måns Rullgård <mans@mansr.com> | 2010-01-26 18:05:55 +0000 |
| commit | f2c694af28c10dcde10aa1f357f2b4e6a6176812 (patch) | |
| tree | 7207e6a8ca2cc3dc738ed04190ce000ba8afe532 | |
| parent | 900479bb74ad0e472b04cef28c91c3b0fef918c2 (diff) | |
| download | ffmpeg-f2c694af28c10dcde10aa1f357f2b4e6a6176812.tar.gz | |
Add UMULH()
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
| -rw-r--r-- | libavcodec/mathops.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/libavcodec/mathops.h b/libavcodec/mathops.h index 5782459080..e33f3bf303 100644 --- a/libavcodec/mathops.h +++ b/libavcodec/mathops.h @@ -53,6 +53,12 @@ static av_always_inline int MULH(int a, int b){ } #endif +#ifndef UMULH +static av_always_inline unsigned UMULH(unsigned a, unsigned b){ + return ((uint64_t)(a) * (uint64_t)(b))>>32; +} +#endif + #ifndef MUL64 # define MUL64(a,b) ((int64_t)(a) * (int64_t)(b)) #endif |