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Alpha optimizations by Falk Hueffner <falk.hueffner@student.uni-tuebingen.de>

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Originally committed as revision 274 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Nick Kurshev
2002-01-20 14:48:02 +00:00
parent 4bdd9157cc
commit 1e98dffb7a
9 changed files with 769 additions and 2 deletions
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14
libavcodec/msmpeg4.c
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@@ -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;