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ffmpeg / libavcodec / i386 / fft_sse.c @ 25e4f8aa

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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 02110-1301 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 .. ln-1 */
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    nblocks = 1 << (ln-3);
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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
197
            ::"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)
201
#endif
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        );
203
        /* Should be in the same block, hack for gcc2.95 & gcc3 */
204
        asm (
205
            "movlps      %%xmm0, %0     \n\t"
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            "movhps      %%xmm0, %1     \n\t"
207
            "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"
219
#endif
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    /* post rotation + reordering */
222
    for (k = 0; k < n4; k += 4) {
223
        asm (
224
            "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
231
            "movlps        8+%2, %%xmm6 \n\t"   // xmm6 = X  X  I1 I0: tsin
232
            "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
237
            "unpcklps    %%xmm6, %%xmm5 \n\t"   // xmm5 = I1 R1 I0 R0
238
            "movaps      %%xmm1, %%xmm2 \n\t"   // xmm2 = I1 R1 I0 R0
239
            "movaps      %%xmm5, %%xmm6 \n\t"   // xmm6 = I1 R1 I0 R0
240
            "xorps   "P1M1P1M1", %%xmm2 \n\t"   // xmm2 = -I1 R1 -I0 R0
241
            "mulps       %%xmm1, %%xmm0 \n\t"   // xmm0 = rI rR rI rR
242
            "xorps   "P1M1P1M1", %%xmm6 \n\t"   // xmm6 = -I1 R1 -I0 R0
243
            "mulps       %%xmm5, %%xmm4 \n\t"   // xmm4 = rI rR rI rR
244
            "shufps $177,%%xmm2, %%xmm2 \n\t"   // xmm2 = R1 -I1 R0 -I0
245
            "shufps $177,%%xmm6, %%xmm6 \n\t"   // xmm6 = R1 -I1 R0 -I0
246
            "mulps       %%xmm2, %%xmm3 \n\t"   // xmm3 = Ri -Ii Ri -Ii
247
            "mulps       %%xmm6, %%xmm7 \n\t"   // xmm7 = Ri -Ii Ri -Ii
248
            "addps       %%xmm3, %%xmm0 \n\t"   // xmm0 = result
249
            "addps       %%xmm7, %%xmm4 \n\t"   // xmm4 = result
250
            "movaps      %%xmm0, %0     \n\t"
251
            "movaps      %%xmm4, 16+%0  \n\t"
252
            :"+m"(z[k])
253
            :"m"(tcos[k]), "m"(tsin[k])
254
#ifndef ARCH_X86_64
255
             ,"m"(*p1m1p1m1)
256
#endif
257
        );
258
    }
259

    
260
    /*
261
       Mnemonics:
262
       0 = z[k].re
263
       1 = z[k].im
264
       2 = z[k + 1].re
265
       3 = z[k + 1].im
266
       4 = z[-k - 2].re
267
       5 = z[-k - 2].im
268
       6 = z[-k - 1].re
269
       7 = z[-k - 1].im
270
    */
271
    k = 16-n;
272
    asm volatile("movaps %0, %%xmm7 \n\t"::"m"(*m1m1m1m1));
273
    asm volatile(
274
        "1: \n\t"
275
        "movaps  -16(%4,%0), %%xmm1 \n\t"   // xmm1 = 4 5 6 7 = z[-2-k]
276
        "neg %0 \n\t"
277
        "movaps     (%4,%0), %%xmm0 \n\t"   // xmm0 = 0 1 2 3 = z[k]
278
        "xorps       %%xmm7, %%xmm0 \n\t"   // xmm0 = -0 -1 -2 -3
279
        "movaps      %%xmm0, %%xmm2 \n\t"   // xmm2 = -0 -1 -2 -3
280
        "shufps $141,%%xmm1, %%xmm0 \n\t"   // xmm0 = -1 -3 4 6
281
        "shufps $216,%%xmm1, %%xmm2 \n\t"   // xmm2 = -0 -2 5 7
282
        "shufps $156,%%xmm0, %%xmm0 \n\t"   // xmm0 = -1 6 -3 4 !
283
        "shufps $156,%%xmm2, %%xmm2 \n\t"   // xmm2 = -0 7 -2 5 !
284
        "movaps      %%xmm0, (%1,%0) \n\t"  // output[2*k]
285
        "movaps      %%xmm2, (%2,%0) \n\t"  // output[n2+2*k]
286
        "neg %0 \n\t"
287
        "shufps $27, %%xmm0, %%xmm0 \n\t"   // xmm0 = 4 -3 6 -1
288
        "xorps       %%xmm7, %%xmm0 \n\t"   // xmm0 = -4 3 -6 1 !
289
        "shufps $27, %%xmm2, %%xmm2 \n\t"   // xmm2 = 5 -2 7 -0 !
290
        "movaps      %%xmm0, -16(%2,%0) \n\t" // output[n2-4-2*k]
291
        "movaps      %%xmm2, -16(%3,%0) \n\t" // output[n-4-2*k]
292
        "add $16, %0 \n\t"
293
        "jle 1b \n\t"
294
        :"+r"(k)
295
        :"r"(output), "r"(output+n2), "r"(output+n), "r"(z+n8)
296
        :"memory"
297
    );
298
}
299