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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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2
libavcodec/arm/fft_init_arm.c
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@ -44,7 +44,7 @@ av_cold void ff_fft_init_arm(FFTContext *s)
s->imdct_calc = ff_imdct_calc_neon;
s->imdct_half = ff_imdct_half_neon;
s->mdct_calc = ff_mdct_calc_neon;
s->permutation = FF_MDCT_PERM_INTERLEAVE;
s->mdct_permutation = FF_MDCT_PERM_INTERLEAVE;
}
}