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Use memcpy() instead of a for loop in mdct512(). 

8% faster in function.

Originally committed as revision 26027 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2010-12-16 03:13:41 +00:00
parent b6f6204db9
commit 9d8533368f
1 changed files with 1 additions and 2 deletions
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3
libavcodec/ac3enc.c
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@ -339,8 +339,7 @@ static void mdct512(int32_t *out, int16_t *in)
/* shift to simplify computations */
for (i = 0; i < MDCT_SAMPLES/4; i++)
rot[i] = -in[i + 3*MDCT_SAMPLES/4];
for (;i < MDCT_SAMPLES; i++)
rot[i] = in[i - MDCT_SAMPLES/4];
memcpy(&rot[MDCT_SAMPLES/4], &in[0], 3*MDCT_SAMPLES/4*sizeof(*in));
/* pre rotation */
for (i = 0; i < MDCT_SAMPLES/4; i++) {