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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>
This commit is contained in:
Loren Merritt 2011-02-12 11:48:16 +00:00 committed by Janne Grunau
parent 3c33c0e263
commit e6b1ed693a
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;
}
}

9
libavcodec/fft.c
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@ -97,6 +97,7 @@ av_cold int ff_fft_init(FFTContext *s, int nbits, int inverse)
if (!s->tmp_buf)
goto fail;
s->inverse = inverse;
s->fft_permutation = FF_FFT_PERM_DEFAULT;
s->fft_permute = ff_fft_permute_c;
s->fft_calc = ff_fft_calc_c;
@ -113,8 +114,12 @@ av_cold int ff_fft_init(FFTContext *s, int nbits, int inverse)
for(j=4; j<=nbits; j++) {
ff_init_ff_cos_tabs(j);
}
for(i=0; i<n; i++)
s->revtab[-split_radix_permutation(i, n, s->inverse) & (n-1)] = i;
for(i=0; i<n; i++) {
int j = i;
if (s->fft_permutation == FF_FFT_PERM_SWAP_LSBS)
j = (j&~3) | ((j>>1)&1) | ((j<<1)&2);
s->revtab[-split_radix_permutation(i, n, s->inverse) & (n-1)] = j;
}
return 0;
fail:

5
libavcodec/fft.h
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@ -44,7 +44,10 @@ struct FFTContext {
void (*imdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
void (*imdct_half)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
void (*mdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
int permutation;
int fft_permutation;
#define FF_FFT_PERM_DEFAULT 0
#define FF_FFT_PERM_SWAP_LSBS 1
int mdct_permutation;
#define FF_MDCT_PERM_NONE 0
#define FF_MDCT_PERM_INTERLEAVE 1
};

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;

1
libavcodec/x86/fft.c
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@ -30,6 +30,7 @@ av_cold void ff_fft_init_mmx(FFTContext *s)
s->imdct_half = ff_imdct_half_sse;
s->fft_permute = ff_fft_permute_sse;
s->fft_calc = ff_fft_calc_sse;
s->fft_permutation = FF_FFT_PERM_SWAP_LSBS;
} else if (has_vectors & AV_CPU_FLAG_3DNOWEXT && HAVE_AMD3DNOWEXT) {
/* 3DNowEx for K7 */
s->imdct_calc = ff_imdct_calc_3dn2;

62
libavcodec/x86/fft_mmx.asm
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@ -51,6 +51,7 @@ SECTION_RODATA
%define M_SQRT1_2 0.70710678118654752440
ps_root2: times 4 dd M_SQRT1_2
ps_root2mppm: dd -M_SQRT1_2, M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2
ps_p1p1m1p1: dd 0, 0, 1<<31, 0
ps_m1p1: dd 1<<31, 0
%assign i 16
@ -95,54 +96,51 @@ section .text align=16
SWAP %3, %6
%endmacro
; in: %1={r0,i0,r1,i1} %2={r2,i2,r3,i3}
; in: %1={r0,i0,r2,i2} %2={r1,i1,r3,i3}
; out: %1={r0,r1,r2,r3} %2={i0,i1,i2,i3}
%macro T4_SSE 3
mova %3, %1
shufps %1, %2, 0x64 ; {r0,i0,r3,i2}
shufps %3, %2, 0xce ; {r1,i1,r2,i3}
addps %1, %2 ; {t1,t2,t6,t5}
subps %3, %2 ; {t3,t4,-t8,t7}
xorps %3, [ps_p1p1m1p1]
mova %2, %1
addps %1, %3 ; {t1,t2,t6,t5}
subps %2, %3 ; {t3,t4,t8,t7}
shufps %1, %3, 0x44 ; {t1,t2,t3,t4}
shufps %2, %3, 0xbe ; {t6,t5,t7,t8}
mova %3, %1
shufps %1, %2, 0x44 ; {t1,t2,t3,t4}
shufps %3, %2, 0xbe ; {t6,t5,t7,t8}
addps %1, %2 ; {r0,i0,r1,i1}
subps %3, %2 ; {r2,i2,r3,i3}
mova %2, %1
addps %1, %3 ; {r0,i0,r1,i1}
subps %2, %3 ; {r2,i2,r3,i3}
mova %3, %1
shufps %1, %2, 0x88 ; {r0,r1,r2,r3}
shufps %3, %2, 0xdd ; {i0,i1,i2,i3}
SWAP %2, %3
shufps %1, %3, 0x88 ; {r0,r1,r2,r3}
shufps %2, %3, 0xdd ; {i0,i1,i2,i3}
%endmacro
%macro T8_SSE 6 ; r0,i0,r1,i1,t0,t1
mova %5, %3
shufps %3, %4, 0x44 ; {r4,i4,r6,i6}
shufps %5, %4, 0xee ; {r5,i5,r7,i7}
; in: %1={r0,r1,r2,r3} %2={i0,i1,i2,i3} %3={r4,i4,r6,i6} %4={r5,i5,r7,i7}
; out: %1={r0,r1,r2,r3} %2={i0,i1,i2,i3} %1={r4,r5,r6,r7} %2={i4,i5,i6,i7}
%macro T8_SSE 6
mova %6, %3
subps %3, %5 ; {r5,i5,r7,i7}
addps %6, %5 ; {t1,t2,t3,t4}
mova %5, %3
shufps %5, %5, 0xb1 ; {i5,r5,i7,r7}
subps %3, %4 ; {r5,i5,r7,i7}
addps %6, %4 ; {t1,t2,t3,t4}
mova %4, %3
shufps %4, %4, 0xb1 ; {i5,r5,i7,r7}
mulps %3, [ps_root2mppm] ; {-r5,i5,r7,-i7}
mulps %5, [ps_root2]
addps %3, %5 ; {t8,t7,ta,t9}
mova %5, %6
mulps %4, [ps_root2]
addps %3, %4 ; {t8,t7,ta,t9}
mova %4, %6
shufps %6, %3, 0x36 ; {t3,t2,t9,t8}
shufps %5, %3, 0x9c ; {t1,t4,t7,ta}
shufps %4, %3, 0x9c ; {t1,t4,t7,ta}
mova %3, %6
addps %6, %5 ; {t1,t2,t9,ta}
subps %3, %5 ; {t6,t5,tc,tb}
mova %5, %6
addps %6, %4 ; {t1,t2,t9,ta}
subps %3, %4 ; {t6,t5,tc,tb}
mova %4, %6
shufps %6, %3, 0xd8 ; {t1,t9,t5,tb}
shufps %5, %3, 0x8d ; {t2,ta,t6,tc}
shufps %4, %3, 0x8d ; {t2,ta,t6,tc}
mova %3, %1
mova %4, %2
mova %5, %2
addps %1, %6 ; {r0,r1,r2,r3}
addps %2, %5 ; {i0,i1,i2,i3}
addps %2, %4 ; {i0,i1,i2,i3}
subps %3, %6 ; {r4,r5,r6,r7}
subps %4, %5 ; {i4,i5,i6,i7}
subps %5, %4 ; {i4,i5,i6,i7}
SWAP %4, %5
%endmacro
; scheduled for cpu-bound sizes