libavcodec/i386/flacdsp_mmx.c

   1 /*
   2  * MMX optimized FLAC DSP utils
   3  * Copyright (c) 2007 Loren Merritt
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/x86_cpu.h"
  23 #include "dsputil_mmx.h"
  24
  25 static void apply_welch_window_sse2(const int32_t *data, int len, double *w_data)
  26 {
  27     double c = 2.0 / (len-1.0);
  28     int n2 = len>>1;
  29     x86_reg i = -n2*sizeof(int32_t);
  30     x86_reg j =  n2*sizeof(int32_t);
  31     asm volatile(
  32         "movsd   %0,     %%xmm7 \n\t"
  33         "movapd  %1,     %%xmm6 \n\t"
  34         "movapd  %2,     %%xmm5 \n\t"
  35         "movlhps %%xmm7, %%xmm7 \n\t"
  36         "subpd   %%xmm5, %%xmm7 \n\t"
  37         "addsd   %%xmm6, %%xmm7 \n\t"
  38         ::"m"(c), "m"(*ff_pd_1), "m"(*ff_pd_2)
  39     );
  40 #define WELCH(MOVPD, offset)\
  41     asm volatile(\
  42         "1:                         \n\t"\
  43         "movapd   %%xmm7,  %%xmm1   \n\t"\
  44         "mulpd    %%xmm1,  %%xmm1   \n\t"\
  45         "movapd   %%xmm6,  %%xmm0   \n\t"\
  46         "subpd    %%xmm1,  %%xmm0   \n\t"\
  47         "pshufd   $0x4e,   %%xmm0, %%xmm1 \n\t"\
  48         "cvtpi2pd (%3,%0), %%xmm2   \n\t"\
  49         "cvtpi2pd "#offset"*4(%3,%1), %%xmm3 \n\t"\
  50         "mulpd    %%xmm0,  %%xmm2   \n\t"\
  51         "mulpd    %%xmm1,  %%xmm3   \n\t"\
  52         "movapd   %%xmm2, (%2,%0,2) \n\t"\
  53         MOVPD"    %%xmm3, "#offset"*8(%2,%1,2) \n\t"\
  54         "subpd    %%xmm5,  %%xmm7   \n\t"\
  55         "sub      $8,      %1       \n\t"\
  56         "add      $8,      %0       \n\t"\
  57         "jl 1b                      \n\t"\
  58         :"+&r"(i), "+&r"(j)\
  59         :"r"(w_data+n2), "r"(data+n2)\
  60     );
  61     if(len&1)
  62         WELCH("movupd", -1)
  63     else
  64         WELCH("movapd", -2)
  65 #undef WELCH
  66 }
  67
  68 void ff_flac_compute_autocorr_sse2(const int32_t *data, int len, int lag,
  69                                    double *autoc)
  70 {
  71     double tmp[len + lag + 2];
  72     double *data1 = tmp + lag;
  73     int j;
  74
  75     if((x86_reg)data1 & 15)
  76         data1++;
  77
  78     apply_welch_window_sse2(data, len, data1);
  79
  80     for(j=0; j<lag; j++)
  81         data1[j-lag]= 0.0;
  82     data1[len] = 0.0;
  83
  84     for(j=0; j<lag; j+=2){
  85         x86_reg i = -len*sizeof(double);
  86         if(j == lag-2) {
  87             asm volatile(
  88                 "movsd     %6,     %%xmm0 \n\t"
  89                 "movsd     %6,     %%xmm1 \n\t"
  90                 "movsd     %6,     %%xmm2 \n\t"
  91                 "1:                       \n\t"
  92                 "movapd   (%4,%0), %%xmm3 \n\t"
  93                 "movupd -8(%5,%0), %%xmm4 \n\t"
  94                 "movapd   (%5,%0), %%xmm5 \n\t"
  95                 "mulpd     %%xmm3, %%xmm4 \n\t"
  96                 "mulpd     %%xmm3, %%xmm5 \n\t"
  97                 "mulpd -16(%5,%0), %%xmm3 \n\t"
  98                 "addpd     %%xmm4, %%xmm1 \n\t"
  99                 "addpd     %%xmm5, %%xmm0 \n\t"
 100                 "addpd     %%xmm3, %%xmm2 \n\t"
 101                 "add       $16,    %0     \n\t"
 102                 "jl 1b                    \n\t"
 103                 "movhlps   %%xmm0, %%xmm3 \n\t"
 104                 "movhlps   %%xmm1, %%xmm4 \n\t"
 105                 "movhlps   %%xmm2, %%xmm5 \n\t"
 106                 "addsd     %%xmm3, %%xmm0 \n\t"
 107                 "addsd     %%xmm4, %%xmm1 \n\t"
 108                 "addsd     %%xmm5, %%xmm2 \n\t"
 109                 "movsd     %%xmm0, %1     \n\t"
 110                 "movsd     %%xmm1, %2     \n\t"
 111                 "movsd     %%xmm2, %3     \n\t"
 112                 :"+&r"(i), "=m"(autoc[j]), "=m"(autoc[j+1]), "=m"(autoc[j+2])
 113                 :"r"(data1+len), "r"(data1+len-j), "m"(*ff_pd_1)
 114             );
 115         } else {
 116             asm volatile(
 117                 "movsd     %5,     %%xmm0 \n\t"
 118                 "movsd     %5,     %%xmm1 \n\t"
 119                 "1:                       \n\t"
 120                 "movapd   (%3,%0), %%xmm3 \n\t"
 121                 "movupd -8(%4,%0), %%xmm4 \n\t"
 122                 "mulpd     %%xmm3, %%xmm4 \n\t"
 123                 "mulpd    (%4,%0), %%xmm3 \n\t"
 124                 "addpd     %%xmm4, %%xmm1 \n\t"
 125                 "addpd     %%xmm3, %%xmm0 \n\t"
 126                 "add       $16,    %0     \n\t"
 127                 "jl 1b                    \n\t"
 128                 "movhlps   %%xmm0, %%xmm3 \n\t"
 129                 "movhlps   %%xmm1, %%xmm4 \n\t"
 130                 "addsd     %%xmm3, %%xmm0 \n\t"
 131                 "addsd     %%xmm4, %%xmm1 \n\t"
 132                 "movsd     %%xmm0, %1     \n\t"
 133                 "movsd     %%xmm1, %2     \n\t"
 134                 :"+&r"(i), "=m"(autoc[j]), "=m"(autoc[j+1])
 135                 :"r"(data1+len), "r"(data1+len-j), "m"(*ff_pd_1)
 136             );
 137         }
 138     }
 139 }