apps/codecs/libspeex/ltp_arm4.h

   1 /* Copyright (C) 2004 Jean-Marc Valin */
   2 /**
   3    @file ltp_arm4.h
   4    @brief Long-Term Prediction functions (ARM4 version)
   5 */
   6 /*
   7    Redistribution and use in source and binary forms, with or without
   8    modification, are permitted provided that the following conditions
   9    are met:
  10
  11    - Redistributions of source code must retain the above copyright
  12    notice, this list of conditions and the following disclaimer.
  13
  14    - Redistributions in binary form must reproduce the above copyright
  15    notice, this list of conditions and the following disclaimer in the
  16    documentation and/or other materials provided with the distribution.
  17
  18    - Neither the name of the Xiph.org Foundation nor the names of its
  19    contributors may be used to endorse or promote products derived from
  20    this software without specific prior written permission.
  21
  22    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  25    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
  26    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  27    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  28    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  29    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  30    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  31    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  32    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33 */
  34
  35 #define OVERRIDE_INNER_PROD
  36 spx_word32_t inner_prod(const spx_word16_t *x, const spx_word16_t *y, int len)
  37 {
  38    spx_word32_t sum1=0,sum2=0;
  39    spx_word16_t *deadx, *deady;
  40    int deadlen, dead1, dead2, dead3, dead4, dead5, dead6;
  41    __asm__ __volatile__ (
  42          "\tldrsh %5, [%0], #2 \n"
  43          "\tldrsh %6, [%1], #2 \n"
  44          ".inner_prod_loop%=:\n"
  45          "\tsub %7, %7, %7\n"
  46          "\tsub %10, %10, %10\n"
  47
  48          "\tldrsh %8, [%0], #2 \n"
  49          "\tldrsh %9, [%1], #2 \n"
  50          "\tmla %7, %5, %6, %7\n"
  51          "\tldrsh %5, [%0], #2 \n"
  52          "\tldrsh %6, [%1], #2 \n"
  53          "\tmla %10, %8, %9, %10\n"
  54          "\tldrsh %8, [%0], #2 \n"
  55          "\tldrsh %9, [%1], #2 \n"
  56          "\tmla %7, %5, %6, %7\n"
  57          "\tldrsh %5, [%0], #2 \n"
  58          "\tldrsh %6, [%1], #2 \n"
  59          "\tmla %10, %8, %9, %10\n"
  60
  61          "\tldrsh %8, [%0], #2 \n"
  62          "\tldrsh %9, [%1], #2 \n"
  63          "\tmla %7, %5, %6, %7\n"
  64          "\tldrsh %5, [%0], #2 \n"
  65          "\tldrsh %6, [%1], #2 \n"
  66          "\tmla %10, %8, %9, %10\n"
  67          "\tldrsh %8, [%0], #2 \n"
  68          "\tldrsh %9, [%1], #2 \n"
  69          "\tmla %7, %5, %6, %7\n"
  70          "\tldrsh %5, [%0], #2 \n"
  71          "\tldrsh %6, [%1], #2 \n"
  72          "\tmla %10, %8, %9, %10\n"
  73
  74          "\tsubs %4, %4, #1\n"
  75          "\tadd %2, %2, %7, asr #5\n"
  76          "\tadd %3, %3, %10, asr #5\n"
  77          "\tbne .inner_prod_loop%=\n"
  78    : "=r" (deadx), "=r" (deady), "+r" (sum1),  "+r" (sum2),
  79      "=r" (deadlen), "=r" (dead1), "=r" (dead2), "=r" (dead3),
  80      "=r" (dead4), "=r" (dead5), "=r" (dead6)
  81    : "0" (x), "1" (y), "4" (len>>3)
  82    : "cc"
  83                         );
  84    return (sum1+sum2)>>1;
  85 }
  86
  87 #define OVERRIDE_PITCH_XCORR
  88 void pitch_xcorr(const spx_word16_t *_x, const spx_word16_t *_y, spx_word32_t *corr, int len, int nb_pitch, char *stack)
  89 {
  90    (void)stack;
  91    int i,j;
  92    for (i=0;i<nb_pitch;i+=4)
  93    {
  94       /* Compute correlation*/
  95       //corr[nb_pitch-1-i]=inner_prod(x, _y+i, len);
  96       spx_word32_t sum1=0;
  97       spx_word32_t sum2=0;
  98       spx_word32_t sum3=0;
  99       spx_word32_t sum4=0;
 100       const spx_word16_t *y = _y+i;
 101       const spx_word16_t *x = _x;
 102       spx_word32_t y0, y1, y2, y3;
 103       y0=*y++;
 104       y1=*y++;
 105       y2=*y++;
 106       y3=*y++;
 107       for (j=0;j<len;j+=4)
 108       {
 109          spx_word32_t part1, part2, part3, part4, x0;
 110          spx_word32_t dead1;
 111          __asm__ __volatile__ (
 112 #ifdef SHORTCUTS
 113                "\tldrsh %10, [%8], #4 \n"
 114                "\tmul %4, %10, %0 \n"
 115                "\tldrsh %15, [%8], #4 \n"
 116                "\tmul %5, %10, %1 \n"
 117                "\tldrsh %0, [%9], #2 \n"
 118                "\tmul %6, %10, %2 \n"
 119                "\tldrsh %1, [%9], #2 \n"
 120                "\tmul %7, %10, %3 \n"
 121
 122
 123                "\tmla %4, %15, %2, %4 \n"
 124                "\tldrsh %2, [%9], #2 \n"
 125                "\tmla %5, %15, %3, %5 \n"
 126                "\tldrsh %3, [%9], #2 \n"
 127                "\tmla %6, %15, %0, %6 \n"
 128                "\tmla %7, %15, %1, %7 \n"
 129
 130 #else
 131                "\tldrsh %10, [%8], #2 \n"
 132                "\tmul %4, %10, %0 \n"
 133                "\tmul %5, %10, %1 \n"
 134                "\tmul %6, %10, %2 \n"
 135                "\tmul %7, %10, %3 \n"
 136
 137                "\tldrsh %10, [%8], #2 \n"
 138                "\tldrsh %0, [%9], #2 \n"
 139                "\tmla %4, %10, %1, %4 \n"
 140                "\tmla %5, %10, %2, %5 \n"
 141                "\tmla %6, %10, %3, %6 \n"
 142                "\tmla %7, %10, %0, %7 \n"
 143
 144                "\tldrsh %10, [%8], #2 \n"
 145                "\tldrsh %1, [%9], #2 \n"
 146                "\tmla %4, %10, %2, %4 \n"
 147                "\tmla %5, %10, %3, %5 \n"
 148                "\tmla %6, %10, %0, %6 \n"
 149                "\tmla %7, %10, %1, %7 \n"
 150
 151                "\tldrsh %10, [%8], #2 \n"
 152                "\tldrsh %2, [%9], #2 \n"
 153                "\tmla %4, %10, %3, %4 \n"
 154                "\tmla %5, %10, %0, %5 \n"
 155                "\tmla %6, %10, %1, %6 \n"
 156                "\tmla %7, %10, %2, %7 \n"
 157
 158                "\tldrsh %3, [%9], #2 \n"
 159 #endif
 160
 161                "\tldr %10, %11 \n"
 162                "\tldr %15, %12 \n"
 163                "\tadd %4, %10, %4, asr #6 \n"
 164                "\tstr %4, %11 \n"
 165                "\tldr %10, %13 \n"
 166                "\tadd %5, %15, %5, asr #6 \n"
 167                "\tstr %5, %12 \n"
 168                "\tldr %15, %14 \n"
 169                "\tadd %6, %10, %6, asr #6 \n"
 170                "\tadd %7, %15, %7, asr #6 \n"
 171                "\tstr %6, %13 \n"
 172                "\tstr %7, %14 \n"
 173
 174             : "+r" (y0), "+r" (y1), "+r" (y2), "+r" (y3),
 175          "=r" (part1),  "=r" (part2),  "=r" (part3),  "=r" (part4),
 176               "+r" (x), "+r" (y), "=r" (x0), "+m" (sum1),
 177               "+m" (sum2), "+m" (sum3), "+m" (sum4), "=r" (dead1)
 178             :
 179             : "cc", "memory"
 180                               );
 181       }
 182       corr[nb_pitch-1-i]=sum1;
 183       corr[nb_pitch-2-i]=sum2;
 184       corr[nb_pitch-3-i]=sum3;
 185       corr[nb_pitch-4-i]=sum4;
 186    }
 187
 188 }