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FFmpeg/libavcodec/mips/fft_mips.c

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  1. /*

  2.  * Copyright (c) 2012

  3.  *      MIPS Technologies, Inc., California.

  4.  *

  5.  * Redistribution and use in source and binary forms, with or without

  6.  * modification, are permitted provided that the following conditions

  7.  * are met:

  8.  * 1. Redistributions of source code must retain the above copyright

  9.  *    notice, this list of conditions and the following disclaimer.

  10.  * 2. Redistributions in binary form must reproduce the above copyright

  11.  *    notice, this list of conditions and the following disclaimer in the

  12.  *    documentation and/or other materials provided with the distribution.

  13.  * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its

  14.  *    contributors may be used to endorse or promote products derived from

  15.  *    this software without specific prior written permission.

  16.  *

  17.  * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND

  18.  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  19.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  20.  * ARE DISCLAIMED.  IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE

  21.  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

  22.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

  23.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

  24.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

  25.  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

  26.  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

  27.  * SUCH DAMAGE.

  28.  *

  29.  * Author:  Stanislav Ocovaj (socovaj@mips.com)

  30.  * Author:  Zoran Lukic (zoranl@mips.com)

  31.  *

  32.  * Optimized MDCT/IMDCT and FFT transforms

  33.  *

  34.  * This file is part of FFmpeg.

  35.  *

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

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

  38.  * License as published by the Free Software Foundation; either

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

  40.  *

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

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

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

  44.  * Lesser General Public License for more details.

  45.  *

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

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

  48.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  49.  */

  50. #include "config.h"

  51. #include "libavcodec/fft.h"

  52. #include "libavcodec/fft_table.h"

  53. 

  54. /**

  55.  * FFT transform

  56.  */

  57. 

  58. #if HAVE_INLINE_ASM

  59. static void ff_fft_calc_mips(FFTContext *s, FFTComplex *z)

  60. {

  61.     int nbits, i, n, num_transforms, offset, step;

  62.     int n4, n2, n34;

  63.     FFTSample tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8;

  64.     FFTComplex *tmpz;

  65.     float w_re, w_im;

  66.     float *w_re_ptr, *w_im_ptr;

  67.     const int fft_size = (1 << s->nbits);

  68.     float pom,  pom1,  pom2,  pom3;

  69.     float temp, temp1, temp3, temp4;

  70.     FFTComplex * tmpz_n2, * tmpz_n34, * tmpz_n4;

  71.     FFTComplex * tmpz_n2_i, * tmpz_n34_i, * tmpz_n4_i, * tmpz_i;

  72. 

  73.     num_transforms = (0x2aab >> (16 - s->nbits)) | 1;

  74. 

  75.     for (n=0; n<num_transforms; n++) {

  76.         offset = ff_fft_offsets_lut[n] << 2;

  77.         tmpz = z + offset;

  78. 

  79.         tmp1 = tmpz[0].re + tmpz[1].re;

  80.         tmp5 = tmpz[2].re + tmpz[3].re;

  81.         tmp2 = tmpz[0].im + tmpz[1].im;

  82.         tmp6 = tmpz[2].im + tmpz[3].im;

  83.         tmp3 = tmpz[0].re - tmpz[1].re;

  84.         tmp8 = tmpz[2].im - tmpz[3].im;

  85.         tmp4 = tmpz[0].im - tmpz[1].im;

  86.         tmp7 = tmpz[2].re - tmpz[3].re;

  87. 

  88.         tmpz[0].re = tmp1 + tmp5;

  89.         tmpz[2].re = tmp1 - tmp5;

  90.         tmpz[0].im = tmp2 + tmp6;

  91.         tmpz[2].im = tmp2 - tmp6;

  92.         tmpz[1].re = tmp3 + tmp8;

  93.         tmpz[3].re = tmp3 - tmp8;

  94.         tmpz[1].im = tmp4 - tmp7;

  95.         tmpz[3].im = tmp4 + tmp7;

  96. 

  97.     }

  98. 

  99.     if (fft_size < 8)

  100.         return;

  101. 

  102.     num_transforms = (num_transforms >> 1) | 1;

  103. 

  104.     for (n=0; n<num_transforms; n++) {

  105.         offset = ff_fft_offsets_lut[n] << 3;

  106.         tmpz = z + offset;

  107. 

  108.         __asm__ volatile (

  109.             "lwc1  %[tmp1], 32(%[tmpz])                     \n\t"

  110.             "lwc1  %[pom],  40(%[tmpz])                     \n\t"

  111.             "lwc1  %[tmp3], 48(%[tmpz])                     \n\t"

  112.             "lwc1  %[pom1], 56(%[tmpz])                     \n\t"

  113.             "lwc1  %[tmp2], 36(%[tmpz])                     \n\t"

  114.             "lwc1  %[pom2], 44(%[tmpz])                     \n\t"

  115.             "lwc1  %[pom3], 60(%[tmpz])                     \n\t"

  116.             "lwc1  %[tmp4], 52(%[tmpz])                     \n\t"

  117.             "add.s %[tmp1], %[tmp1],    %[pom]              \n\t"  // tmp1 = tmpz[4].re + tmpz[5].re;

  118.             "add.s %[tmp3], %[tmp3],    %[pom1]             \n\t"  // tmp3 = tmpz[6].re + tmpz[7].re;

  119.             "add.s %[tmp2], %[tmp2],    %[pom2]             \n\t"  // tmp2 = tmpz[4].im + tmpz[5].im;

  120.             "lwc1  %[pom],  40(%[tmpz])                     \n\t"

  121.             "add.s %[tmp4], %[tmp4],    %[pom3]             \n\t"  // tmp4 = tmpz[6].im + tmpz[7].im;

  122.             "add.s %[tmp5], %[tmp1],    %[tmp3]             \n\t"  // tmp5 = tmp1 + tmp3;

  123.             "sub.s %[tmp7], %[tmp1],    %[tmp3]             \n\t"  // tmp7 = tmp1 - tmp3;

  124.             "lwc1  %[tmp1], 32(%[tmpz])                     \n\t"

  125.             "lwc1  %[pom1], 44(%[tmpz])                     \n\t"

  126.             "add.s %[tmp6], %[tmp2],    %[tmp4]             \n\t"  // tmp6 = tmp2 + tmp4;

  127.             "sub.s %[tmp8], %[tmp2],    %[tmp4]             \n\t"  // tmp8 = tmp2 - tmp4;

  128.             "lwc1  %[tmp2], 36(%[tmpz])                     \n\t"

  129.             "lwc1  %[pom2], 56(%[tmpz])                     \n\t"

  130.             "lwc1  %[pom3], 60(%[tmpz])                     \n\t"

  131.             "lwc1  %[tmp3], 48(%[tmpz])                     \n\t"

  132.             "lwc1  %[tmp4], 52(%[tmpz])                     \n\t"

  133.             "sub.s %[tmp1], %[tmp1],    %[pom]              \n\t"  // tmp1 = tmpz[4].re - tmpz[5].re;

  134.             "lwc1  %[pom],  0(%[tmpz])                      \n\t"

  135.             "sub.s %[tmp2], %[tmp2],    %[pom1]             \n\t"  // tmp2 = tmpz[4].im - tmpz[5].im;

  136.             "sub.s %[tmp3], %[tmp3],    %[pom2]             \n\t"  // tmp3 = tmpz[6].re - tmpz[7].re;

  137.             "lwc1  %[pom2], 4(%[tmpz])                      \n\t"

  138.             "sub.s %[pom1], %[pom],     %[tmp5]             \n\t"

  139.             "sub.s %[tmp4], %[tmp4],    %[pom3]             \n\t"  // tmp4 = tmpz[6].im - tmpz[7].im;

  140.             "add.s %[pom3], %[pom],     %[tmp5]             \n\t"

  141.             "sub.s %[pom],  %[pom2],    %[tmp6]             \n\t"

  142.             "add.s %[pom2], %[pom2],    %[tmp6]             \n\t"

  143.             "swc1  %[pom1], 32(%[tmpz])                     \n\t"  // tmpz[4].re = tmpz[0].re - tmp5;

  144.             "swc1  %[pom3], 0(%[tmpz])                      \n\t"  // tmpz[0].re = tmpz[0].re + tmp5;

  145.             "swc1  %[pom],  36(%[tmpz])                     \n\t"  // tmpz[4].im = tmpz[0].im - tmp6;

  146.             "swc1  %[pom2], 4(%[tmpz])                      \n\t"  // tmpz[0].im = tmpz[0].im + tmp6;

  147.             "lwc1  %[pom1], 16(%[tmpz])                     \n\t"

  148.             "lwc1  %[pom3], 20(%[tmpz])                     \n\t"

  149.             "li.s  %[pom],  0.7071067812                    \n\t"  // float pom = 0.7071067812f;

  150.             "add.s %[temp1],%[tmp1],    %[tmp2]             \n\t"

  151.             "sub.s %[temp], %[pom1],    %[tmp8]             \n\t"

  152.             "add.s %[pom2], %[pom3],    %[tmp7]             \n\t"

  153.             "sub.s %[temp3],%[tmp3],    %[tmp4]             \n\t"

  154.             "sub.s %[temp4],%[tmp2],    %[tmp1]             \n\t"

  155.             "swc1  %[temp], 48(%[tmpz])                     \n\t"  // tmpz[6].re = tmpz[2].re - tmp8;

  156.             "swc1  %[pom2], 52(%[tmpz])                     \n\t"  // tmpz[6].im = tmpz[2].im + tmp7;

  157.             "add.s %[pom1], %[pom1],    %[tmp8]             \n\t"

  158.             "sub.s %[pom3], %[pom3],    %[tmp7]             \n\t"

  159.             "add.s %[tmp3], %[tmp3],    %[tmp4]             \n\t"

  160.             "mul.s %[tmp5], %[pom],     %[temp1]            \n\t"  // tmp5 = pom * (tmp1 + tmp2);

  161.             "mul.s %[tmp7], %[pom],     %[temp3]            \n\t"  // tmp7 = pom * (tmp3 - tmp4);

  162.             "mul.s %[tmp6], %[pom],     %[temp4]            \n\t"  // tmp6 = pom * (tmp2 - tmp1);

  163.             "mul.s %[tmp8], %[pom],     %[tmp3]             \n\t"  // tmp8 = pom * (tmp3 + tmp4);

  164.             "swc1  %[pom1], 16(%[tmpz])                     \n\t"  // tmpz[2].re = tmpz[2].re + tmp8;

  165.             "swc1  %[pom3], 20(%[tmpz])                     \n\t"  // tmpz[2].im = tmpz[2].im - tmp7;

  166.             "add.s %[tmp1], %[tmp5],    %[tmp7]             \n\t"  // tmp1 = tmp5 + tmp7;

  167.             "sub.s %[tmp3], %[tmp5],    %[tmp7]             \n\t"  // tmp3 = tmp5 - tmp7;

  168.             "add.s %[tmp2], %[tmp6],    %[tmp8]             \n\t"  // tmp2 = tmp6 + tmp8;

  169.             "sub.s %[tmp4], %[tmp6],    %[tmp8]             \n\t"  // tmp4 = tmp6 - tmp8;

  170.             "lwc1  %[temp], 8(%[tmpz])                      \n\t"

  171.             "lwc1  %[temp1],12(%[tmpz])                     \n\t"

  172.             "lwc1  %[pom],  24(%[tmpz])                     \n\t"

  173.             "lwc1  %[pom2], 28(%[tmpz])                     \n\t"

  174.             "sub.s %[temp4],%[temp],    %[tmp1]             \n\t"

  175.             "sub.s %[temp3],%[temp1],   %[tmp2]             \n\t"

  176.             "add.s %[temp], %[temp],    %[tmp1]             \n\t"

  177.             "add.s %[temp1],%[temp1],   %[tmp2]             \n\t"

  178.             "sub.s %[pom1], %[pom],     %[tmp4]             \n\t"

  179.             "add.s %[pom3], %[pom2],    %[tmp3]             \n\t"

  180.             "add.s %[pom],  %[pom],     %[tmp4]             \n\t"

  181.             "sub.s %[pom2], %[pom2],    %[tmp3]             \n\t"

  182.             "swc1  %[temp4],40(%[tmpz])                     \n\t"  // tmpz[5].re = tmpz[1].re - tmp1;

  183.             "swc1  %[temp3],44(%[tmpz])                     \n\t"  // tmpz[5].im = tmpz[1].im - tmp2;

  184.             "swc1  %[temp], 8(%[tmpz])                      \n\t"  // tmpz[1].re = tmpz[1].re + tmp1;

  185.             "swc1  %[temp1],12(%[tmpz])                     \n\t"  // tmpz[1].im = tmpz[1].im + tmp2;

  186.             "swc1  %[pom1], 56(%[tmpz])                     \n\t"  // tmpz[7].re = tmpz[3].re - tmp4;

  187.             "swc1  %[pom3], 60(%[tmpz])                     \n\t"  // tmpz[7].im = tmpz[3].im + tmp3;

  188.             "swc1  %[pom],  24(%[tmpz])                     \n\t"  // tmpz[3].re = tmpz[3].re + tmp4;

  189.             "swc1  %[pom2], 28(%[tmpz])                     \n\t"  // tmpz[3].im = tmpz[3].im - tmp3;

  190.             : [tmp1]"=&f"(tmp1), [pom]"=&f"(pom),   [pom1]"=&f"(pom1), [pom2]"=&f"(pom2),

  191.               [tmp3]"=&f"(tmp3), [tmp2]"=&f"(tmp2), [tmp4]"=&f"(tmp4), [tmp5]"=&f"(tmp5),  [tmp7]"=&f"(tmp7),

  192.               [tmp6]"=&f"(tmp6), [tmp8]"=&f"(tmp8), [pom3]"=&f"(pom3),[temp]"=&f"(temp), [temp1]"=&f"(temp1),

  193.               [temp3]"=&f"(temp3), [temp4]"=&f"(temp4)

  194.             : [tmpz]"r"(tmpz)

  195.             : "memory"

  196.         );

  197.     }

  198. 

  199.     step = 1 << (MAX_LOG2_NFFT - 4);

  200.     n4 = 4;

  201. 

  202.     for (nbits=4; nbits<=s->nbits; nbits++) {

  203.         num_transforms = (num_transforms >> 1) | 1;

  204.         n2  = 2 * n4;

  205.         n34 = 3 * n4;

  206. 

  207.         for (n=0; n<num_transforms; n++) {

  208.             offset = ff_fft_offsets_lut[n] << nbits;

  209.             tmpz = z + offset;

  210. 

  211.             tmpz_n2  = tmpz +  n2;

  212.             tmpz_n4  = tmpz +  n4;

  213.             tmpz_n34 = tmpz +  n34;

  214. 

  215.             __asm__ volatile (

  216.                 "lwc1  %[pom1], 0(%[tmpz_n2])            \n\t"

  217.                 "lwc1  %[pom],  0(%[tmpz_n34])           \n\t"

  218.                 "lwc1  %[pom2], 4(%[tmpz_n2])            \n\t"

  219.                 "lwc1  %[pom3], 4(%[tmpz_n34])           \n\t"

  220.                 "lwc1  %[temp1],0(%[tmpz])               \n\t"

  221.                 "lwc1  %[temp3],4(%[tmpz])               \n\t"

  222.                 "add.s %[tmp5], %[pom1],      %[pom]     \n\t"   //  tmp5 = tmpz[ n2].re + tmpz[n34].re;

  223.                 "sub.s %[tmp1], %[pom1],      %[pom]     \n\t"   //  tmp1 = tmpz[ n2].re - tmpz[n34].re;

  224.                 "add.s %[tmp6], %[pom2],      %[pom3]    \n\t"   //  tmp6 = tmpz[ n2].im + tmpz[n34].im;

  225.                 "sub.s %[tmp2], %[pom2],      %[pom3]    \n\t"   //  tmp2 = tmpz[ n2].im - tmpz[n34].im;

  226.                 "sub.s %[temp], %[temp1],     %[tmp5]    \n\t"

  227.                 "add.s %[temp1],%[temp1],     %[tmp5]    \n\t"

  228.                 "sub.s %[temp4],%[temp3],     %[tmp6]    \n\t"

  229.                 "add.s %[temp3],%[temp3],     %[tmp6]    \n\t"

  230.                 "swc1  %[temp], 0(%[tmpz_n2])            \n\t"   //  tmpz[ n2].re = tmpz[ 0].re - tmp5;

  231.                 "swc1  %[temp1],0(%[tmpz])               \n\t"   //  tmpz[  0].re = tmpz[ 0].re + tmp5;

  232.                 "lwc1  %[pom1], 0(%[tmpz_n4])            \n\t"

  233.                 "swc1  %[temp4],4(%[tmpz_n2])            \n\t"   //  tmpz[ n2].im = tmpz[ 0].im - tmp6;

  234.                 "lwc1  %[temp], 4(%[tmpz_n4])            \n\t"

  235.                 "swc1  %[temp3],4(%[tmpz])               \n\t"   //  tmpz[  0].im = tmpz[ 0].im + tmp6;

  236.                 "sub.s %[pom],  %[pom1],      %[tmp2]    \n\t"

  237.                 "add.s %[pom1], %[pom1],      %[tmp2]    \n\t"

  238.                 "add.s %[temp1],%[temp],      %[tmp1]    \n\t"

  239.                 "sub.s %[temp], %[temp],      %[tmp1]    \n\t"

  240.                 "swc1  %[pom],  0(%[tmpz_n34])           \n\t"   //  tmpz[n34].re = tmpz[n4].re - tmp2;

  241.                 "swc1  %[pom1], 0(%[tmpz_n4])            \n\t"   //  tmpz[ n4].re = tmpz[n4].re + tmp2;

  242.                 "swc1  %[temp1],4(%[tmpz_n34])           \n\t"   //  tmpz[n34].im = tmpz[n4].im + tmp1;

  243.                 "swc1  %[temp], 4(%[tmpz_n4])            \n\t"   //  tmpz[ n4].im = tmpz[n4].im - tmp1;

  244.                 : [tmp5]"=&f"(tmp5),

  245.                   [tmp1]"=&f"(tmp1), [pom]"=&f"(pom),        [pom1]"=&f"(pom1),        [pom2]"=&f"(pom2),

  246.                   [tmp2]"=&f"(tmp2), [tmp6]"=&f"(tmp6),          [pom3]"=&f"(pom3),

  247.                   [temp]"=&f"(temp), [temp1]"=&f"(temp1),     [temp3]"=&f"(temp3),       [temp4]"=&f"(temp4)

  248.                 : [tmpz]"r"(tmpz), [tmpz_n2]"r"(tmpz_n2), [tmpz_n34]"r"(tmpz_n34), [tmpz_n4]"r"(tmpz_n4)

  249.                 : "memory"

  250.             );

  251. 

  252.             w_re_ptr = (float*)(ff_cos_65536 + step);

  253.             w_im_ptr = (float*)(ff_cos_65536 + MAX_FFT_SIZE/4 - step);

  254. 

  255.             for (i=1; i<n4; i++) {

  256.                 w_re = w_re_ptr[0];

  257.                 w_im = w_im_ptr[0];

  258.                 tmpz_n2_i = tmpz_n2  + i;

  259.                 tmpz_n4_i = tmpz_n4  + i;

  260.                 tmpz_n34_i= tmpz_n34 + i;

  261.                 tmpz_i    = tmpz     + i;

  262. 

  263.                 __asm__ volatile (

  264.                     "lwc1     %[temp],  0(%[tmpz_n2_i])               \n\t"

  265.                     "lwc1     %[temp1], 4(%[tmpz_n2_i])               \n\t"

  266.                     "lwc1     %[pom],   0(%[tmpz_n34_i])              \n\t"

  267.                     "lwc1     %[pom1],  4(%[tmpz_n34_i])              \n\t"

  268.                     "mul.s    %[temp3], %[w_im],    %[temp]           \n\t"

  269.                     "mul.s    %[temp4], %[w_im],    %[temp1]          \n\t"

  270.                     "mul.s    %[pom2],  %[w_im],    %[pom1]           \n\t"

  271.                     "mul.s    %[pom3],  %[w_im],    %[pom]            \n\t"

  272.                     "msub.s   %[tmp2],  %[temp3],   %[w_re], %[temp1] \n\t"  // tmp2 = w_re * tmpz[ n2+i].im - w_im * tmpz[ n2+i].re;

  273.                     "madd.s   %[tmp1],  %[temp4],   %[w_re], %[temp]  \n\t"  // tmp1 = w_re * tmpz[ n2+i].re + w_im * tmpz[ n2+i].im;

  274.                     "msub.s   %[tmp3],  %[pom2],    %[w_re], %[pom]   \n\t"  // tmp3 = w_re * tmpz[n34+i].re - w_im * tmpz[n34+i].im;

  275.                     "madd.s   %[tmp4],  %[pom3],    %[w_re], %[pom1]  \n\t"  // tmp4 = w_re * tmpz[n34+i].im + w_im * tmpz[n34+i].re;

  276.                     "lwc1     %[temp],  0(%[tmpz_i])                  \n\t"

  277.                     "lwc1     %[pom],   4(%[tmpz_i])                  \n\t"

  278.                     "add.s    %[tmp5],  %[tmp1],    %[tmp3]           \n\t"  // tmp5 = tmp1 + tmp3;

  279.                     "sub.s    %[tmp1],  %[tmp1],    %[tmp3]           \n\t"  // tmp1 = tmp1 - tmp3;

  280.                     "add.s    %[tmp6],  %[tmp2],    %[tmp4]           \n\t"  // tmp6 = tmp2 + tmp4;

  281.                     "sub.s    %[tmp2],  %[tmp2],    %[tmp4]           \n\t"  // tmp2 = tmp2 - tmp4;

  282.                     "sub.s    %[temp1], %[temp],    %[tmp5]           \n\t"

  283.                     "add.s    %[temp],  %[temp],    %[tmp5]           \n\t"

  284.                     "sub.s    %[pom1],  %[pom],     %[tmp6]           \n\t"

  285.                     "add.s    %[pom],   %[pom],     %[tmp6]           \n\t"

  286.                     "lwc1     %[temp3], 0(%[tmpz_n4_i])               \n\t"

  287.                     "lwc1     %[pom2],  4(%[tmpz_n4_i])               \n\t"

  288.                     "swc1     %[temp1], 0(%[tmpz_n2_i])               \n\t"  // tmpz[ n2+i].re = tmpz[   i].re - tmp5;

  289.                     "swc1     %[temp],  0(%[tmpz_i])                  \n\t"  // tmpz[    i].re = tmpz[   i].re + tmp5;

  290.                     "swc1     %[pom1],  4(%[tmpz_n2_i])               \n\t"  // tmpz[ n2+i].im = tmpz[   i].im - tmp6;

  291.                     "swc1     %[pom] ,  4(%[tmpz_i])                  \n\t"  // tmpz[    i].im = tmpz[   i].im + tmp6;

  292.                     "sub.s    %[temp4], %[temp3],   %[tmp2]           \n\t"

  293.                     "add.s    %[pom3],  %[pom2],    %[tmp1]           \n\t"

  294.                     "add.s    %[temp3], %[temp3],   %[tmp2]           \n\t"

  295.                     "sub.s    %[pom2],  %[pom2],    %[tmp1]           \n\t"

  296.                     "swc1     %[temp4], 0(%[tmpz_n34_i])              \n\t"  // tmpz[n34+i].re = tmpz[n4+i].re - tmp2;

  297.                     "swc1     %[pom3],  4(%[tmpz_n34_i])              \n\t"  // tmpz[n34+i].im = tmpz[n4+i].im + tmp1;

  298.                     "swc1     %[temp3], 0(%[tmpz_n4_i])               \n\t"  // tmpz[ n4+i].re = tmpz[n4+i].re + tmp2;

  299.                     "swc1     %[pom2],  4(%[tmpz_n4_i])               \n\t"  // tmpz[ n4+i].im = tmpz[n4+i].im - tmp1;

  300.                     : [tmp1]"=&f"(tmp1), [tmp2]"=&f" (tmp2), [temp]"=&f"(temp), [tmp3]"=&f"(tmp3),

  301.                       [tmp4]"=&f"(tmp4), [tmp5]"=&f"(tmp5), [tmp6]"=&f"(tmp6),

  302.                       [temp1]"=&f"(temp1), [temp3]"=&f"(temp3), [temp4]"=&f"(temp4),

  303.                       [pom]"=&f"(pom), [pom1]"=&f"(pom1), [pom2]"=&f"(pom2), [pom3]"=&f"(pom3)

  304.                     : [w_re]"f"(w_re), [w_im]"f"(w_im),

  305.                       [tmpz_i]"r"(tmpz_i),[tmpz_n2_i]"r"(tmpz_n2_i),

  306.                       [tmpz_n34_i]"r"(tmpz_n34_i), [tmpz_n4_i]"r"(tmpz_n4_i)

  307.                     : "memory"

  308.                 );

  309.                 w_re_ptr += step;

  310.                 w_im_ptr -= step;

  311.             }

  312.         }

  313.         step >>= 1;

  314.         n4   <<= 1;

  315.     }

  316. }

  317. 

  318. /**

  319.  * MDCT/IMDCT transforms.

  320.  */

  321. 

  322. static void ff_imdct_half_mips(FFTContext *s, FFTSample *output, const FFTSample *input)

  323. {

  324.     int k, n8, n4, n2, n, j;

  325.     const uint16_t *revtab = s->revtab;

  326.     const FFTSample *tcos = s->tcos;

  327.     const FFTSample *tsin = s->tsin;

  328.     const FFTSample *in1, *in2, *in3, *in4;

  329.     FFTComplex *z = (FFTComplex *)output;

  330. 

  331.     int j1;

  332.     const float *tcos1, *tsin1, *tcos2, *tsin2;

  333.     float temp1, temp2, temp3, temp4, temp5, temp6, temp7, temp8,

  334.         temp9, temp10, temp11, temp12, temp13, temp14, temp15, temp16;

  335.     FFTComplex *z1, *z2;

  336. 

  337.     n = 1 << s->mdct_bits;

  338.     n2 = n >> 1;

  339.     n4 = n >> 2;

  340.     n8 = n >> 3;

  341. 

  342.     /* pre rotation */

  343.     in1 = input;

  344.     in2 = input + n2 - 1;

  345.     in3 = input + 2;

  346.     in4 = input + n2 - 3;

  347. 

  348.     tcos1 = tcos;

  349.     tsin1 = tsin;

  350. 

  351.     /* n4 = 64 or 128 */

  352.     for(k = 0; k < n4; k += 2) {

  353.         j  = revtab[k    ];

  354.         j1 = revtab[k + 1];

  355. 

  356.         __asm__ volatile (

  357.             "lwc1           %[temp1],       0(%[in2])                           \t\n"

  358.             "lwc1           %[temp2],       0(%[tcos1])                         \t\n"

  359.             "lwc1           %[temp3],       0(%[tsin1])                         \t\n"

  360.             "lwc1           %[temp4],       0(%[in1])                           \t\n"

  361.             "lwc1           %[temp5],       0(%[in4])                           \t\n"

  362.             "mul.s          %[temp9],       %[temp1],   %[temp2]                \t\n"

  363.             "mul.s          %[temp10],      %[temp1],   %[temp3]                \t\n"

  364.             "lwc1           %[temp6],       4(%[tcos1])                         \t\n"

  365.             "lwc1           %[temp7],       4(%[tsin1])                         \t\n"

  366.             "nmsub.s        %[temp9],       %[temp9],   %[temp4],   %[temp3]    \t\n"

  367.             "madd.s         %[temp10],      %[temp10],  %[temp4],   %[temp2]    \t\n"

  368.             "mul.s          %[temp11],      %[temp5],   %[temp6]                \t\n"

  369.             "mul.s          %[temp12],      %[temp5],   %[temp7]                \t\n"

  370.             "lwc1           %[temp8],       0(%[in3])                           \t\n"

  371.             "addiu          %[tcos1],       %[tcos1],   8                       \t\n"

  372.             "addiu          %[tsin1],       %[tsin1],   8                       \t\n"

  373.             "addiu          %[in1],         %[in1],     16                      \t\n"

  374.             "nmsub.s        %[temp11],      %[temp11],  %[temp8],   %[temp7]    \t\n"

  375.             "madd.s         %[temp12],      %[temp12],  %[temp8],   %[temp6]    \t\n"

  376.             "addiu          %[in2],         %[in2],     -16                     \t\n"

  377.             "addiu          %[in3],         %[in3],     16                      \t\n"

  378.             "addiu          %[in4],         %[in4],     -16                     \t\n"

  379. 

  380.             : [temp1]"=&f"(temp1), [temp2]"=&f"(temp2),

  381.               [temp3]"=&f"(temp3), [temp4]"=&f"(temp4),

  382.               [temp5]"=&f"(temp5), [temp6]"=&f"(temp6),

  383.               [temp7]"=&f"(temp7), [temp8]"=&f"(temp8),

  384.               [temp9]"=&f"(temp9), [temp10]"=&f"(temp10),

  385.               [temp11]"=&f"(temp11), [temp12]"=&f"(temp12),

  386.               [tsin1]"+r"(tsin1), [tcos1]"+r"(tcos1),

  387.               [in1]"+r"(in1), [in2]"+r"(in2),

  388.               [in3]"+r"(in3), [in4]"+r"(in4)

  389.             :

  390.             : "memory"

  391.         );

  392. 

  393.         z[j ].re = temp9;

  394.         z[j ].im = temp10;

  395.         z[j1].re = temp11;

  396.         z[j1].im = temp12;

  397.     }

  398. 

  399.     s->fft_calc(s, z);

  400. 

  401.     /* post rotation + reordering */

  402.     /* n8 = 32 or 64 */

  403.     for(k = 0; k < n8; k += 2) {

  404.         tcos1 = &tcos[n8 - k - 2];

  405.         tsin1 = &tsin[n8 - k - 2];

  406.         tcos2 = &tcos[n8 + k];

  407.         tsin2 = &tsin[n8 + k];

  408.         z1 = &z[n8 - k - 2];

  409.         z2 = &z[n8 + k    ];

  410. 

  411.         __asm__ volatile (

  412.             "lwc1       %[temp1],   12(%[z1])                           \t\n"

  413.             "lwc1       %[temp2],   4(%[tsin1])                         \t\n"

  414.             "lwc1       %[temp3],   4(%[tcos1])                         \t\n"

  415.             "lwc1       %[temp4],   8(%[z1])                            \t\n"

  416.             "lwc1       %[temp5],   4(%[z1])                            \t\n"

  417.             "mul.s      %[temp9],   %[temp1],   %[temp2]                \t\n"

  418.             "mul.s      %[temp10],  %[temp1],   %[temp3]                \t\n"

  419.             "lwc1       %[temp6],   0(%[tsin1])                         \t\n"

  420.             "lwc1       %[temp7],   0(%[tcos1])                         \t\n"

  421.             "nmsub.s    %[temp9],   %[temp9],   %[temp4],   %[temp3]    \t\n"

  422.             "madd.s     %[temp10],  %[temp10],  %[temp4],   %[temp2]    \t\n"

  423.             "mul.s      %[temp11],  %[temp5],   %[temp6]                \t\n"

  424.             "mul.s      %[temp12],  %[temp5],   %[temp7]                \t\n"

  425.             "lwc1       %[temp8],   0(%[z1])                            \t\n"

  426.             "lwc1       %[temp1],   4(%[z2])                            \t\n"

  427.             "lwc1       %[temp2],   0(%[tsin2])                         \t\n"

  428.             "lwc1       %[temp3],   0(%[tcos2])                         \t\n"

  429.             "nmsub.s    %[temp11],  %[temp11],  %[temp8],   %[temp7]    \t\n"

  430.             "madd.s     %[temp12],  %[temp12],  %[temp8],   %[temp6]    \t\n"

  431.             "mul.s      %[temp13],  %[temp1],   %[temp2]                \t\n"

  432.             "mul.s      %[temp14],  %[temp1],   %[temp3]                \t\n"

  433.             "lwc1       %[temp4],   0(%[z2])                            \t\n"

  434.             "lwc1       %[temp5],   12(%[z2])                           \t\n"

  435.             "lwc1       %[temp6],   4(%[tsin2])                         \t\n"

  436.             "lwc1       %[temp7],   4(%[tcos2])                         \t\n"

  437.             "nmsub.s    %[temp13],  %[temp13],  %[temp4],   %[temp3]    \t\n"

  438.             "madd.s     %[temp14],  %[temp14],  %[temp4],   %[temp2]    \t\n"

  439.             "mul.s      %[temp15],  %[temp5],   %[temp6]                \t\n"

  440.             "mul.s      %[temp16],  %[temp5],   %[temp7]                \t\n"

  441.             "lwc1       %[temp8],   8(%[z2])                            \t\n"

  442.             "nmsub.s    %[temp15],  %[temp15],  %[temp8],   %[temp7]    \t\n"

  443.             "madd.s     %[temp16],  %[temp16],  %[temp8],   %[temp6]    \t\n"

  444.             : [temp1]"=&f"(temp1), [temp2]"=&f"(temp2),

  445.               [temp3]"=&f"(temp3), [temp4]"=&f"(temp4),

  446.               [temp5]"=&f"(temp5), [temp6]"=&f"(temp6),

  447.               [temp7]"=&f"(temp7), [temp8]"=&f"(temp8),

  448.               [temp9]"=&f"(temp9), [temp10]"=&f"(temp10),

  449.               [temp11]"=&f"(temp11), [temp12]"=&f"(temp12),

  450.               [temp13]"=&f"(temp13), [temp14]"=&f"(temp14),

  451.               [temp15]"=&f"(temp15), [temp16]"=&f"(temp16)

  452.             : [z1]"r"(z1), [z2]"r"(z2),

  453.               [tsin1]"r"(tsin1), [tcos1]"r"(tcos1),

  454.               [tsin2]"r"(tsin2), [tcos2]"r"(tcos2)

  455.             : "memory"

  456.         );

  457. 

  458.         z1[1].re = temp9;

  459.         z1[1].im = temp14;

  460.         z2[0].re = temp13;

  461.         z2[0].im = temp10;

  462. 

  463.         z1[0].re = temp11;

  464.         z1[0].im = temp16;

  465.         z2[1].re = temp15;

  466.         z2[1].im = temp12;

  467.     }

  468. }

  469. 

  470. /**

  471.  * Compute inverse MDCT of size N = 2^nbits

  472.  * @param output N samples

  473.  * @param input N/2 samples

  474.  */

  475. static void ff_imdct_calc_mips(FFTContext *s, FFTSample *output, const FFTSample *input)

  476. {

  477.     int k;

  478.     int n = 1 << s->mdct_bits;

  479.     int n2 = n >> 1;

  480.     int n4 = n >> 2;

  481. 

  482.     ff_imdct_half_mips(s, output+n4, input);

  483. 

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

  485.         output[k] = -output[n2-k-1];

  486.         output[k+1] = -output[n2-k-2];

  487.         output[k+2] = -output[n2-k-3];

  488.         output[k+3] = -output[n2-k-4];

  489. 

  490.         output[n-k-1] = output[n2+k];

  491.         output[n-k-2] = output[n2+k+1];

  492.         output[n-k-3] = output[n2+k+2];

  493.         output[n-k-4] = output[n2+k+3];

  494.     }

  495. }

  496. #endif /* HAVE_INLINE_ASM */

  497. 

  498. av_cold void ff_fft_init_mips(FFTContext *s)

  499. {

  500.     int n=0;

  501. 

  502.     ff_fft_lut_init(ff_fft_offsets_lut, 0, 1 << 16, &n);

  503.     ff_init_ff_cos_tabs(16);

  504. 

  505. #if HAVE_INLINE_ASM

  506.     s->fft_calc     = ff_fft_calc_mips;

  507. #if CONFIG_MDCT

  508.     s->imdct_calc   = ff_imdct_calc_mips;

  509.     s->imdct_half   = ff_imdct_half_mips;

  510. #endif

  511. #endif

  512. }