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| author | Nick Kurshev <nickols_k@mail.ru> | 2002-01-20 14:48:02 +0000 |
|---|---|---|
| committer | Nick Kurshev <nickols_k@mail.ru> | 2002-01-20 14:48:02 +0000 |
| commit | 1e98dffb7aa4b4681ecc7949e7ad58acc80ad86a (patch) | |
| tree | eda5315707572d48e2f75e55cd210254068fea18 /libavcodec/msmpeg4.c | |
| parent | 4bdd9157cc0b06c7001cb93e5cdd6304306253c4 (diff) | |
| download | ffmpeg-1e98dffb7aa4b4681ecc7949e7ad58acc80ad86a.tar.gz | |
Alpha optimizations by Falk Hueffner <falk.hueffner@student.uni-tuebingen.de>
Originally committed as revision 274 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/msmpeg4.c')
| -rw-r--r-- | libavcodec/msmpeg4.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/libavcodec/msmpeg4.c b/libavcodec/msmpeg4.c index db767422dc..c5bd55b93c 100644 --- a/libavcodec/msmpeg4.c +++ b/libavcodec/msmpeg4.c @@ -460,7 +460,19 @@ static int msmpeg4_pred_dc(MpegEncContext * s, int n, : "r" (scale) : "%eax", "%edx" ); -#else +#elif defined (ARCH_ALPHA) + /* Divisions are extremely costly on Alpha; optimize the most + common case. */ + if (scale == 8) { + a = (a + (8 >> 1)) / 8; + b = (b + (8 >> 1)) / 8; + c = (c + (8 >> 1)) / 8; + } else { + a = (a + (scale >> 1)) / scale; + b = (b + (scale >> 1)) / scale; + c = (c + (scale >> 1)) / scale; + } +#else a = (a + (scale >> 1)) / scale; b = (b + (scale >> 1)) / scale; c = (c + (scale >> 1)) / scale; |