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ffmpeg / libavcodec / i386 / flacdsp_mmx.c @ 00969e1c

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/*
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 * MMX optimized FLAC DSP utils
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 * Copyright (c) 2007 Loren Merritt
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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 "libavutil/x86_cpu.h"
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#include "dsputil_mmx.h"
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static void apply_welch_window_sse2(const int32_t *data, int len, double *w_data)
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{
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    double c = 2.0 / (len-1.0);
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    int n2 = len>>1;
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    x86_reg i = -n2*sizeof(int32_t);
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    x86_reg j =  n2*sizeof(int32_t);
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    asm volatile(
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        "movsd   %0,     %%xmm7 \n\t"
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        "movapd  "MANGLE(ff_pd_1)",     %%xmm6 \n\t"
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        "movapd  "MANGLE(ff_pd_2)",     %%xmm5 \n\t"
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        "movlhps %%xmm7, %%xmm7 \n\t"
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        "subpd   %%xmm5, %%xmm7 \n\t"
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        "addsd   %%xmm6, %%xmm7 \n\t"
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        ::"m"(c)
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    );
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#define WELCH(MOVPD, offset)\
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    asm volatile(\
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        "1:                         \n\t"\
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        "movapd   %%xmm7,  %%xmm1   \n\t"\
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        "mulpd    %%xmm1,  %%xmm1   \n\t"\
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        "movapd   %%xmm6,  %%xmm0   \n\t"\
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        "subpd    %%xmm1,  %%xmm0   \n\t"\
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        "pshufd   $0x4e,   %%xmm0, %%xmm1 \n\t"\
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        "cvtpi2pd (%3,%0), %%xmm2   \n\t"\
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        "cvtpi2pd "#offset"*4(%3,%1), %%xmm3 \n\t"\
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        "mulpd    %%xmm0,  %%xmm2   \n\t"\
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        "mulpd    %%xmm1,  %%xmm3   \n\t"\
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        "movapd   %%xmm2, (%2,%0,2) \n\t"\
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        MOVPD"    %%xmm3, "#offset"*8(%2,%1,2) \n\t"\
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        "subpd    %%xmm5,  %%xmm7   \n\t"\
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        "sub      $8,      %1       \n\t"\
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        "add      $8,      %0       \n\t"\
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        "jl 1b                      \n\t"\
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        :"+&r"(i), "+&r"(j)\
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        :"r"(w_data+n2), "r"(data+n2)\
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    );
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    if(len&1)
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        WELCH("movupd", -1)
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    else
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        WELCH("movapd", -2)
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#undef WELCH
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}
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void ff_flac_compute_autocorr_sse2(const int32_t *data, int len, int lag,
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                                   double *autoc)
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{
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    double tmp[len + lag + 2];
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    double *data1 = tmp + lag;
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    int j;
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    if((x86_reg)data1 & 15)
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        data1++;
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    apply_welch_window_sse2(data, len, data1);
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    for(j=0; j<lag; j++)
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        data1[j-lag]= 0.0;
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    data1[len] = 0.0;
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    for(j=0; j<lag; j+=2){
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        x86_reg i = -len*sizeof(double);
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        if(j == lag-2) {
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            asm volatile(
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                "movsd     "MANGLE(ff_pd_1)",     %%xmm0 \n\t"
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                "movsd     "MANGLE(ff_pd_1)",     %%xmm1 \n\t"
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                "movsd     "MANGLE(ff_pd_1)",     %%xmm2 \n\t"
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                "1:                       \n\t"
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                "movapd   (%4,%0), %%xmm3 \n\t"
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                "movupd -8(%5,%0), %%xmm4 \n\t"
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                "movapd   (%5,%0), %%xmm5 \n\t"
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                "mulpd     %%xmm3, %%xmm4 \n\t"
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                "mulpd     %%xmm3, %%xmm5 \n\t"
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                "mulpd -16(%5,%0), %%xmm3 \n\t"
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                "addpd     %%xmm4, %%xmm1 \n\t"
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                "addpd     %%xmm5, %%xmm0 \n\t"
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                "addpd     %%xmm3, %%xmm2 \n\t"
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                "add       $16,    %0     \n\t"
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                "jl 1b                    \n\t"
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                "movhlps   %%xmm0, %%xmm3 \n\t"
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                "movhlps   %%xmm1, %%xmm4 \n\t"
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                "movhlps   %%xmm2, %%xmm5 \n\t"
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                "addsd     %%xmm3, %%xmm0 \n\t"
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                "addsd     %%xmm4, %%xmm1 \n\t"
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                "addsd     %%xmm5, %%xmm2 \n\t"
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                "movsd     %%xmm0, %1     \n\t"
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                "movsd     %%xmm1, %2     \n\t"
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                "movsd     %%xmm2, %3     \n\t"
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                :"+&r"(i), "=m"(autoc[j]), "=m"(autoc[j+1]), "=m"(autoc[j+2])
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                :"r"(data1+len), "r"(data1+len-j)
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            );
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        } else {
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            asm volatile(
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                "movsd     "MANGLE(ff_pd_1)",     %%xmm0 \n\t"
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                "movsd     "MANGLE(ff_pd_1)",     %%xmm1 \n\t"
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                "1:                       \n\t"
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                "movapd   (%3,%0), %%xmm3 \n\t"
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                "movupd -8(%4,%0), %%xmm4 \n\t"
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                "mulpd     %%xmm3, %%xmm4 \n\t"
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                "mulpd    (%4,%0), %%xmm3 \n\t"
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                "addpd     %%xmm4, %%xmm1 \n\t"
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                "addpd     %%xmm3, %%xmm0 \n\t"
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                "add       $16,    %0     \n\t"
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                "jl 1b                    \n\t"
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                "movhlps   %%xmm0, %%xmm3 \n\t"
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                "movhlps   %%xmm1, %%xmm4 \n\t"
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                "addsd     %%xmm3, %%xmm0 \n\t"
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                "addsd     %%xmm4, %%xmm1 \n\t"
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                "movsd     %%xmm0, %1     \n\t"
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                "movsd     %%xmm1, %2     \n\t"
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                :"+&r"(i), "=m"(autoc[j]), "=m"(autoc[j+1])
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                :"r"(data1+len), "r"(data1+len-j)
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            );
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        }
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    }
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}