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FFT: factor a shuffle out of the inner loop and merge it into fft_permute.

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6% faster SSE FFT on Conroe, 2.5% on Penryn.

Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net>
(cherry picked from commit e6b1ed693a)
This commit is contained in:
Loren Merritt
2011-02-12 11:48:16 +00:00
committed by Michael Niedermayer
parent 709946b34c
commit 11ab1e409f
6 changed files with 45 additions and 38 deletions
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4
libavcodec/mdct.c
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@@ -71,7 +71,7 @@ av_cold int ff_mdct_init(FFTContext *s, int nbits, int inverse, double scale)
s->mdct_bits = nbits;
s->mdct_size = n;
n4 = n >> 2;
s->permutation = FF_MDCT_PERM_NONE;
s->mdct_permutation = FF_MDCT_PERM_NONE;
if (ff_fft_init(s, s->mdct_bits - 2, inverse) < 0)
goto fail;
@@ -80,7 +80,7 @@ av_cold int ff_mdct_init(FFTContext *s, int nbits, int inverse, double scale)
if (!s->tcos)
goto fail;
switch (s->permutation) {
switch (s->mdct_permutation) {
case FF_MDCT_PERM_NONE:
s->tsin = s->tcos + n4;
tstep = 1;