[SCM] libav/experimental: Write results of post-rotation complex multiply directly to output. 2% faster in function mdct512().
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 17:20:29 UTC 2013
The following commit has been merged in the experimental branch:
commit e29065f7bfababd7016620e9535fe879d21fcf33
Author: Justin Ruggles <justin.ruggles at gmail.com>
Date: Thu Dec 16 03:13:45 2010 +0000
Write results of post-rotation complex multiply directly to output.
2% faster in function mdct512().
Originally committed as revision 26028 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c
index e041a41..1f9e01e 100644
--- a/libavcodec/ac3enc.c
+++ b/libavcodec/ac3enc.c
@@ -332,7 +332,7 @@ static void fft(IComplex *z, int ln)
*/
static void mdct512(int32_t *out, int16_t *in)
{
- int i, re, im, re1, im1;
+ int i, re, im;
int16_t rot[MDCT_SAMPLES];
IComplex x[MDCT_SAMPLES/4];
@@ -354,9 +354,7 @@ static void mdct512(int32_t *out, int16_t *in)
for (i = 0; i < MDCT_SAMPLES/4; i++) {
re = x[i].re;
im = x[i].im;
- CMUL(re1, im1, re, im, xsin1[i], xcos1[i]);
- out[ 2*i] = im1;
- out[MDCT_SAMPLES/2-1-2*i] = re1;
+ CMUL(out[MDCT_SAMPLES/2-1-2*i], out[2*i], re, im, xsin1[i], xcos1[i]);
}
}
--
Libav/FFmpeg packaging
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