ffmpeg / libavcodec / i386 / fft_sse.c @ b550bfaa
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/*


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* FFT/MDCT transform with SSE optimizations

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* Copyright (c) 2002 Fabrice Bellard.

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*

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* This file is part of FFmpeg.

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*

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* FFmpeg is free software; you can redistribute it and/or

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* modify it under the terms of the GNU Lesser General Public

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* License as published by the Free Software Foundation; either

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* version 2.1 of the License, or (at your option) any later version.

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*

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* FFmpeg is distributed in the hope that it will be useful,

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* but WITHOUT ANY WARRANTY; without even the implied warranty of

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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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* Lesser General Public License for more details.

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*

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* You should have received a copy of the GNU Lesser General Public

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* License along with FFmpeg; if not, write to the Free Software

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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 021101301 USA

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*/

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#include "dsputil.h" 
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static const int p1p1p1m1[4] __attribute__((aligned(16))) = 
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{ 0, 0, 0, 1 << 31 }; 
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static const int p1p1m1p1[4] __attribute__((aligned(16))) = 
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{ 0, 0, 1 << 31, 0 }; 
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static const int p1p1m1m1[4] __attribute__((aligned(16))) = 
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{ 0, 0, 1 << 31, 1 << 31 }; 
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static const int p1m1p1m1[4] __attribute__((aligned(16))) = 
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{ 0, 1 << 31, 0, 1 << 31 }; 
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static const int m1m1m1m1[4] __attribute__((aligned(16))) = 
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{ 1 << 31, 1 << 31, 1 << 31, 1 << 31 }; 
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#if 0

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static void print_v4sf(const char *str, __m128 a)

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{

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float *p = (float *)&a;

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printf("%s: %f %f %f %f\n",

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str, p[0], p[1], p[2], p[3]);

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}

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#endif

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/* XXX: handle reverse case */

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void ff_fft_calc_sse(FFTContext *s, FFTComplex *z)

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{ 
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int ln = s>nbits;

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long i, j;

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long nblocks, nloops;

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FFTComplex *p, *cptr; 
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asm volatile( 
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"movaps %0, %%xmm4 \n\t"

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"movaps %1, %%xmm5 \n\t"

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::"m"(*p1p1m1m1),

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"m"(*(s>inverse ? p1p1m1p1 : p1p1p1m1))

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); 
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i = 8 << ln;

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asm volatile( 
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"1: \n\t"

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"sub $32, %0 \n\t"

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/* do the pass 0 butterfly */

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"movaps (%0,%1), %%xmm0 \n\t"

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"movaps %%xmm0, %%xmm1 \n\t"

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"shufps $0x4E, %%xmm0, %%xmm0 \n\t"

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"xorps %%xmm4, %%xmm1 \n\t"

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"addps %%xmm1, %%xmm0 \n\t"

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"movaps 16(%0,%1), %%xmm2 \n\t"

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"movaps %%xmm2, %%xmm3 \n\t"

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"shufps $0x4E, %%xmm2, %%xmm2 \n\t"

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"xorps %%xmm4, %%xmm3 \n\t"

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"addps %%xmm3, %%xmm2 \n\t"

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/* multiply third by i */

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/* by toggling the sign bit */

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"shufps $0xB4, %%xmm2, %%xmm2 \n\t"

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"xorps %%xmm5, %%xmm2 \n\t"

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/* do the pass 1 butterfly */

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"movaps %%xmm0, %%xmm1 \n\t"

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"addps %%xmm2, %%xmm0 \n\t"

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"subps %%xmm2, %%xmm1 \n\t"

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"movaps %%xmm0, (%0,%1) \n\t"

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"movaps %%xmm1, 16(%0,%1) \n\t"

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"jg 1b \n\t"

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:"+r"(i)

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:"r"(z)

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); 
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/* pass 2 .. ln1 */

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nblocks = 1 << (ln3); 
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nloops = 1 << 2; 
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cptr = s>exptab1; 
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do {

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p = z; 
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j = nblocks; 
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do {

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i = nloops*8;

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asm volatile( 
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"1: \n\t"

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"sub $32, %0 \n\t"

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"movaps (%2,%0), %%xmm1 \n\t"

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"movaps (%1,%0), %%xmm0 \n\t"

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"movaps 16(%2,%0), %%xmm5 \n\t"

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"movaps 16(%1,%0), %%xmm4 \n\t"

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"movaps %%xmm1, %%xmm2 \n\t"

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"movaps %%xmm5, %%xmm6 \n\t"

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"shufps $0xA0, %%xmm1, %%xmm1 \n\t"

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"shufps $0xF5, %%xmm2, %%xmm2 \n\t"

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"shufps $0xA0, %%xmm5, %%xmm5 \n\t"

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"shufps $0xF5, %%xmm6, %%xmm6 \n\t"

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"mulps (%3,%0,2), %%xmm1 \n\t" // cre*re cim*re 
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"mulps 16(%3,%0,2), %%xmm2 \n\t" // cim*im cre*im 
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"mulps 32(%3,%0,2), %%xmm5 \n\t" // cre*re cim*re 
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"mulps 48(%3,%0,2), %%xmm6 \n\t" // cim*im cre*im 
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"addps %%xmm2, %%xmm1 \n\t"

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"addps %%xmm6, %%xmm5 \n\t"

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"movaps %%xmm0, %%xmm3 \n\t"

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"movaps %%xmm4, %%xmm7 \n\t"

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"addps %%xmm1, %%xmm0 \n\t"

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"subps %%xmm1, %%xmm3 \n\t"

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"addps %%xmm5, %%xmm4 \n\t"

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"subps %%xmm5, %%xmm7 \n\t"

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"movaps %%xmm0, (%1,%0) \n\t"

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"movaps %%xmm3, (%2,%0) \n\t"

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"movaps %%xmm4, 16(%1,%0) \n\t"

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"movaps %%xmm7, 16(%2,%0) \n\t"

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"jg 1b \n\t"

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:"+r"(i)

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:"r"(p), "r"(p + nloops), "r"(cptr) 
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); 
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p += nloops*2;

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} while (j);

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cptr += nloops*2;

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nblocks >>= 1;

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nloops <<= 1;

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} while (nblocks != 0); 
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} 
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void ff_imdct_calc_sse(MDCTContext *s, FFTSample *output,

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const FFTSample *input, FFTSample *tmp)

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{ 
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long k, n8, n4, n2, n;

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const uint16_t *revtab = s>fft.revtab;

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const FFTSample *tcos = s>tcos;

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const FFTSample *tsin = s>tsin;

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const FFTSample *in1, *in2;

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FFTComplex *z = (FFTComplex *)tmp; 
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n = 1 << s>nbits;

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n2 = n >> 1;

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n4 = n >> 2;

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n8 = n >> 3;

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#ifdef ARCH_X86_64

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asm volatile ("movaps %0, %%xmm8\n\t"::"m"(*p1m1p1m1)); 
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#define P1M1P1M1 "%%xmm8" 
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#else

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#define P1M1P1M1 "%4" 
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#endif

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/* pre rotation */

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in1 = input; 
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in2 = input + n2  4;

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/* Complex multiplication */

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for (k = 0; k < n4; k += 4) { 
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asm volatile ( 
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"movaps %0, %%xmm0 \n\t" // xmm0 = r0 X r1 X : in2 
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"movaps %1, %%xmm3 \n\t" // xmm3 = X i1 X i0: in1 
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"movaps 16+%0, %%xmm4 \n\t" // xmm4 = r0 X r1 X : in2 
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"movaps 16+%1, %%xmm7 \n\t" // xmm7 = X i1 X i0: in1 
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"movlps %2, %%xmm1 \n\t" // xmm1 = X X R1 R0: tcos 
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"movlps %3, %%xmm2 \n\t" // xmm2 = X X I1 I0: tsin 
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"movlps 8+%2, %%xmm5 \n\t" // xmm5 = X X R1 R0: tcos 
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"movlps 8+%3, %%xmm6 \n\t" // xmm6 = X X I1 I0: tsin 
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"shufps $95, %%xmm0, %%xmm0 \n\t" // xmm0 = r1 r1 r0 r0 
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"shufps $160,%%xmm3, %%xmm3 \n\t" // xmm3 = i1 i1 i0 i0 
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"shufps $95, %%xmm4, %%xmm4 \n\t" // xmm4 = r1 r1 r0 r0 
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"shufps $160,%%xmm7, %%xmm7 \n\t" // xmm7 = i1 i1 i0 i0 
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"unpcklps %%xmm2, %%xmm1 \n\t" // xmm1 = I1 R1 I0 R0 
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"unpcklps %%xmm6, %%xmm5 \n\t" // xmm5 = I1 R1 I0 R0 
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"movaps %%xmm1, %%xmm2 \n\t" // xmm2 = I1 R1 I0 R0 
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"movaps %%xmm5, %%xmm6 \n\t" // xmm6 = I1 R1 I0 R0 
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"xorps "P1M1P1M1", %%xmm2 \n\t" // xmm2 = I1 R1 I0 R0 
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"xorps "P1M1P1M1", %%xmm6 \n\t" // xmm6 = I1 R1 I0 R0 
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"mulps %%xmm1, %%xmm0 \n\t" // xmm0 = rI rR rI rR 
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"mulps %%xmm5, %%xmm4 \n\t" // xmm4 = rI rR rI rR 
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"shufps $177,%%xmm2, %%xmm2 \n\t" // xmm2 = R1 I1 R0 I0 
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"shufps $177,%%xmm6, %%xmm6 \n\t" // xmm6 = R1 I1 R0 I0 
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"mulps %%xmm2, %%xmm3 \n\t" // xmm3 = Ri Ii Ri Ii 
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"mulps %%xmm6, %%xmm7 \n\t" // xmm7 = Ri Ii Ri Ii 
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"addps %%xmm3, %%xmm0 \n\t" // xmm0 = result 
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"addps %%xmm7, %%xmm4 \n\t" // xmm4 = result 
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::"m"(in2[2*k]), "m"(in1[2*k]), 
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"m"(tcos[k]), "m"(tsin[k]) 
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#ifndef ARCH_X86_64

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,"m"(*p1m1p1m1)

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#endif

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); 
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/* Should be in the same block, hack for gcc2.95 & gcc3 */

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asm (

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"movlps %%xmm0, %0 \n\t"

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"movhps %%xmm0, %1 \n\t"

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"movlps %%xmm4, %2 \n\t"

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"movhps %%xmm4, %3 \n\t"

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:"=m"(z[revtab[k]]), "=m"(z[revtab[k + 1]]), 
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"=m"(z[revtab[k + 2]]), "=m"(z[revtab[k + 3]]) 
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); 
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} 
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ff_fft_calc_sse(&s>fft, z); 
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#ifndef ARCH_X86_64

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#undef P1M1P1M1

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#define P1M1P1M1 "%3" 
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#endif

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/* post rotation + reordering */

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for (k = 0; k < n4; k += 4) { 
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asm (

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"movaps %0, %%xmm0 \n\t" // xmm0 = i1 r1 i0 r0: z 
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"movaps 16+%0, %%xmm4 \n\t" // xmm4 = i1 r1 i0 r0: z 
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"movlps %1, %%xmm1 \n\t" // xmm1 = X X R1 R0: tcos 
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"movlps 8+%1, %%xmm5 \n\t" // xmm5 = X X R1 R0: tcos 
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"movaps %%xmm0, %%xmm3 \n\t" // xmm3 = i1 r1 i0 r0 
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"movaps %%xmm4, %%xmm7 \n\t" // xmm7 = i1 r1 i0 r0 
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"movlps %2, %%xmm2 \n\t" // xmm2 = X X I1 I0: tsin 
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"movlps 8+%2, %%xmm6 \n\t" // xmm6 = X X I1 I0: tsin 
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"shufps $160,%%xmm0, %%xmm0 \n\t" // xmm0 = r1 r1 r0 r0 
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"shufps $245,%%xmm3, %%xmm3 \n\t" // xmm3 = i1 i1 i0 i0 
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"shufps $160,%%xmm4, %%xmm4 \n\t" // xmm4 = r1 r1 r0 r0 
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"shufps $245,%%xmm7, %%xmm7 \n\t" // xmm7 = i1 i1 i0 i0 
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"unpcklps %%xmm2, %%xmm1 \n\t" // xmm1 = I1 R1 I0 R0 
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"unpcklps %%xmm6, %%xmm5 \n\t" // xmm5 = I1 R1 I0 R0 
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"movaps %%xmm1, %%xmm2 \n\t" // xmm2 = I1 R1 I0 R0 
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"movaps %%xmm5, %%xmm6 \n\t" // xmm6 = I1 R1 I0 R0 
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"xorps "P1M1P1M1", %%xmm2 \n\t" // xmm2 = I1 R1 I0 R0 
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"mulps %%xmm1, %%xmm0 \n\t" // xmm0 = rI rR rI rR 
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"xorps "P1M1P1M1", %%xmm6 \n\t" // xmm6 = I1 R1 I0 R0 
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"mulps %%xmm5, %%xmm4 \n\t" // xmm4 = rI rR rI rR 
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"shufps $177,%%xmm2, %%xmm2 \n\t" // xmm2 = R1 I1 R0 I0 
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"shufps $177,%%xmm6, %%xmm6 \n\t" // xmm6 = R1 I1 R0 I0 
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"mulps %%xmm2, %%xmm3 \n\t" // xmm3 = Ri Ii Ri Ii 
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"mulps %%xmm6, %%xmm7 \n\t" // xmm7 = Ri Ii Ri Ii 
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"addps %%xmm3, %%xmm0 \n\t" // xmm0 = result 
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"addps %%xmm7, %%xmm4 \n\t" // xmm4 = result 
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"movaps %%xmm0, %0 \n\t"

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"movaps %%xmm4, 16+%0 \n\t"

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:"+m"(z[k])

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:"m"(tcos[k]), "m"(tsin[k]) 
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#ifndef ARCH_X86_64

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,"m"(*p1m1p1m1)

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#endif

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); 
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} 
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/*

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Mnemonics:

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0 = z[k].re

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1 = z[k].im

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2 = z[k + 1].re

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3 = z[k + 1].im

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4 = z[k  2].re

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5 = z[k  2].im

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6 = z[k  1].re

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7 = z[k  1].im

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*/

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k = 16n;

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asm volatile("movaps %0, %%xmm7 \n\t"::"m"(*m1m1m1m1)); 
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asm volatile( 
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"1: \n\t"

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"movaps 16(%4,%0), %%xmm1 \n\t" // xmm1 = 4 5 6 7 = z[2k] 
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"neg %0 \n\t"

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"movaps (%4,%0), %%xmm0 \n\t" // xmm0 = 0 1 2 3 = z[k] 
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"xorps %%xmm7, %%xmm0 \n\t" // xmm0 = 0 1 2 3 
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"movaps %%xmm0, %%xmm2 \n\t" // xmm2 = 0 1 2 3 
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"shufps $141,%%xmm1, %%xmm0 \n\t" // xmm0 = 1 3 4 6 
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"shufps $216,%%xmm1, %%xmm2 \n\t" // xmm2 = 0 2 5 7 
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"shufps $156,%%xmm0, %%xmm0 \n\t" // xmm0 = 1 6 3 4 ! 
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"shufps $156,%%xmm2, %%xmm2 \n\t" // xmm2 = 0 7 2 5 ! 
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"movaps %%xmm0, (%1,%0) \n\t" // output[2*k] 
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"movaps %%xmm2, (%2,%0) \n\t" // output[n2+2*k] 
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"neg %0 \n\t"

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"shufps $27, %%xmm0, %%xmm0 \n\t" // xmm0 = 4 3 6 1 
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"xorps %%xmm7, %%xmm0 \n\t" // xmm0 = 4 3 6 1 ! 
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"shufps $27, %%xmm2, %%xmm2 \n\t" // xmm2 = 5 2 7 0 ! 
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"movaps %%xmm0, 16(%2,%0) \n\t" // output[n242*k] 
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"movaps %%xmm2, 16(%3,%0) \n\t" // output[n42*k] 
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"add $16, %0 \n\t"

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"jle 1b \n\t"

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:"+r"(k)

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:"r"(output), "r"(output+n2), "r"(output+n), "r"(z+n8) 
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:"memory"

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); 
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} 
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