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  1. /*
  2.         dct64_i386.c: DCT64, a C variant for i386
  3.  
  4.         copyright ?-2006 by the mpg123 project - free software under the terms of the LGPL 2.1
  5.         see COPYING and AUTHORS files in distribution or http://mpg123.de
  6.         initially written by Michael Hipp
  7. */
  8.  
  9. /*
  10.  * Discrete Cosine Tansform (DCT) for subband synthesis
  11.  * optimized for machines with no auto-increment.
  12.  * The performance is highly compiler dependend. Maybe
  13.  * the dct64.c version for 'normal' processor may be faster
  14.  * even for Intel processors.
  15.  */
  16.  
  17. //#include "config.h"
  18. #include "mpg123.h"
  19.  
  20. static void dct64_1(real *out0,real *out1,real *b1,real *b2,real *samples)
  21. {
  22.  {
  23.   register real *costab = pnts[0];
  24.  
  25.   b1[0x00] = samples[0x00] + samples[0x1F];
  26.   b1[0x01] = samples[0x01] + samples[0x1E];
  27.   b1[0x1F] = (samples[0x00] - samples[0x1F]) * costab[0x0];
  28.   b1[0x1E] = (samples[0x01] - samples[0x1E]) * costab[0x1];
  29.  
  30.   b1[0x02] = samples[0x02] + samples[0x1D];
  31.   b1[0x03] = samples[0x03] + samples[0x1C];
  32.   b1[0x1D] = (samples[0x02] - samples[0x1D]) * costab[0x2];
  33.   b1[0x1C] = (samples[0x03] - samples[0x1C]) * costab[0x3];
  34.  
  35.   b1[0x04] = samples[0x04] + samples[0x1B];
  36.   b1[0x05] = samples[0x05] + samples[0x1A];
  37.   b1[0x1B] = (samples[0x04] - samples[0x1B]) * costab[0x4];
  38.   b1[0x1A] = (samples[0x05] - samples[0x1A]) * costab[0x5];
  39.  
  40.   b1[0x06] = samples[0x06] + samples[0x19];
  41.   b1[0x07] = samples[0x07] + samples[0x18];
  42.   b1[0x19] = (samples[0x06] - samples[0x19]) * costab[0x6];
  43.   b1[0x18] = (samples[0x07] - samples[0x18]) * costab[0x7];
  44.  
  45.   b1[0x08] = samples[0x08] + samples[0x17];
  46.   b1[0x09] = samples[0x09] + samples[0x16];
  47.   b1[0x17] = (samples[0x08] - samples[0x17]) * costab[0x8];
  48.   b1[0x16] = (samples[0x09] - samples[0x16]) * costab[0x9];
  49.  
  50.   b1[0x0A] = samples[0x0A] + samples[0x15];
  51.   b1[0x0B] = samples[0x0B] + samples[0x14];
  52.   b1[0x15] = (samples[0x0A] - samples[0x15]) * costab[0xA];
  53.   b1[0x14] = (samples[0x0B] - samples[0x14]) * costab[0xB];
  54.  
  55.   b1[0x0C] = samples[0x0C] + samples[0x13];
  56.   b1[0x0D] = samples[0x0D] + samples[0x12];
  57.   b1[0x13] = (samples[0x0C] - samples[0x13]) * costab[0xC];
  58.   b1[0x12] = (samples[0x0D] - samples[0x12]) * costab[0xD];
  59.  
  60.   b1[0x0E] = samples[0x0E] + samples[0x11];
  61.   b1[0x0F] = samples[0x0F] + samples[0x10];
  62.   b1[0x11] = (samples[0x0E] - samples[0x11]) * costab[0xE];
  63.   b1[0x10] = (samples[0x0F] - samples[0x10]) * costab[0xF];
  64.  
  65.  }
  66.  
  67.  
  68.  {
  69.   register real *costab = pnts[1];
  70.  
  71.   b2[0x00] = b1[0x00] + b1[0x0F];
  72.   b2[0x01] = b1[0x01] + b1[0x0E];
  73.   b2[0x0F] = (b1[0x00] - b1[0x0F]) * costab[0];
  74.   b2[0x0E] = (b1[0x01] - b1[0x0E]) * costab[1];
  75.  
  76.   b2[0x02] = b1[0x02] + b1[0x0D];
  77.   b2[0x03] = b1[0x03] + b1[0x0C];
  78.   b2[0x0D] = (b1[0x02] - b1[0x0D]) * costab[2];
  79.   b2[0x0C] = (b1[0x03] - b1[0x0C]) * costab[3];
  80.  
  81.   b2[0x04] = b1[0x04] + b1[0x0B];
  82.   b2[0x05] = b1[0x05] + b1[0x0A];
  83.   b2[0x0B] = (b1[0x04] - b1[0x0B]) * costab[4];
  84.   b2[0x0A] = (b1[0x05] - b1[0x0A]) * costab[5];
  85.  
  86.   b2[0x06] = b1[0x06] + b1[0x09];
  87.   b2[0x07] = b1[0x07] + b1[0x08];
  88.   b2[0x09] = (b1[0x06] - b1[0x09]) * costab[6];
  89.   b2[0x08] = (b1[0x07] - b1[0x08]) * costab[7];
  90.  
  91.   /* */
  92.  
  93.   b2[0x10] = b1[0x10] + b1[0x1F];
  94.   b2[0x11] = b1[0x11] + b1[0x1E];
  95.   b2[0x1F] = (b1[0x1F] - b1[0x10]) * costab[0];
  96.   b2[0x1E] = (b1[0x1E] - b1[0x11]) * costab[1];
  97.  
  98.   b2[0x12] = b1[0x12] + b1[0x1D];
  99.   b2[0x13] = b1[0x13] + b1[0x1C];
  100.   b2[0x1D] = (b1[0x1D] - b1[0x12]) * costab[2];
  101.   b2[0x1C] = (b1[0x1C] - b1[0x13]) * costab[3];
  102.  
  103.   b2[0x14] = b1[0x14] + b1[0x1B];
  104.   b2[0x15] = b1[0x15] + b1[0x1A];
  105.   b2[0x1B] = (b1[0x1B] - b1[0x14]) * costab[4];
  106.   b2[0x1A] = (b1[0x1A] - b1[0x15]) * costab[5];
  107.  
  108.   b2[0x16] = b1[0x16] + b1[0x19];
  109.   b2[0x17] = b1[0x17] + b1[0x18];
  110.   b2[0x19] = (b1[0x19] - b1[0x16]) * costab[6];
  111.   b2[0x18] = (b1[0x18] - b1[0x17]) * costab[7];
  112.  }
  113.  
  114.  {
  115.   register real *costab = pnts[2];
  116.  
  117.   b1[0x00] = b2[0x00] + b2[0x07];
  118.   b1[0x07] = (b2[0x00] - b2[0x07]) * costab[0];
  119.   b1[0x01] = b2[0x01] + b2[0x06];
  120.   b1[0x06] = (b2[0x01] - b2[0x06]) * costab[1];
  121.   b1[0x02] = b2[0x02] + b2[0x05];
  122.   b1[0x05] = (b2[0x02] - b2[0x05]) * costab[2];
  123.   b1[0x03] = b2[0x03] + b2[0x04];
  124.   b1[0x04] = (b2[0x03] - b2[0x04]) * costab[3];
  125.  
  126.   b1[0x08] = b2[0x08] + b2[0x0F];
  127.   b1[0x0F] = (b2[0x0F] - b2[0x08]) * costab[0];
  128.   b1[0x09] = b2[0x09] + b2[0x0E];
  129.   b1[0x0E] = (b2[0x0E] - b2[0x09]) * costab[1];
  130.   b1[0x0A] = b2[0x0A] + b2[0x0D];
  131.   b1[0x0D] = (b2[0x0D] - b2[0x0A]) * costab[2];
  132.   b1[0x0B] = b2[0x0B] + b2[0x0C];
  133.   b1[0x0C] = (b2[0x0C] - b2[0x0B]) * costab[3];
  134.  
  135.   b1[0x10] = b2[0x10] + b2[0x17];
  136.   b1[0x17] = (b2[0x10] - b2[0x17]) * costab[0];
  137.   b1[0x11] = b2[0x11] + b2[0x16];
  138.   b1[0x16] = (b2[0x11] - b2[0x16]) * costab[1];
  139.   b1[0x12] = b2[0x12] + b2[0x15];
  140.   b1[0x15] = (b2[0x12] - b2[0x15]) * costab[2];
  141.   b1[0x13] = b2[0x13] + b2[0x14];
  142.   b1[0x14] = (b2[0x13] - b2[0x14]) * costab[3];
  143.  
  144.   b1[0x18] = b2[0x18] + b2[0x1F];
  145.   b1[0x1F] = (b2[0x1F] - b2[0x18]) * costab[0];
  146.   b1[0x19] = b2[0x19] + b2[0x1E];
  147.   b1[0x1E] = (b2[0x1E] - b2[0x19]) * costab[1];
  148.   b1[0x1A] = b2[0x1A] + b2[0x1D];
  149.   b1[0x1D] = (b2[0x1D] - b2[0x1A]) * costab[2];
  150.   b1[0x1B] = b2[0x1B] + b2[0x1C];
  151.   b1[0x1C] = (b2[0x1C] - b2[0x1B]) * costab[3];
  152.  }
  153.  
  154.  {
  155.   register real const cos0 = pnts[3][0];
  156.   register real const cos1 = pnts[3][1];
  157.  
  158.   b2[0x00] = b1[0x00] + b1[0x03];
  159.   b2[0x03] = (b1[0x00] - b1[0x03]) * cos0;
  160.   b2[0x01] = b1[0x01] + b1[0x02];
  161.   b2[0x02] = (b1[0x01] - b1[0x02]) * cos1;
  162.  
  163.   b2[0x04] = b1[0x04] + b1[0x07];
  164.   b2[0x07] = (b1[0x07] - b1[0x04]) * cos0;
  165.   b2[0x05] = b1[0x05] + b1[0x06];
  166.   b2[0x06] = (b1[0x06] - b1[0x05]) * cos1;
  167.  
  168.   b2[0x08] = b1[0x08] + b1[0x0B];
  169.   b2[0x0B] = (b1[0x08] - b1[0x0B]) * cos0;
  170.   b2[0x09] = b1[0x09] + b1[0x0A];
  171.   b2[0x0A] = (b1[0x09] - b1[0x0A]) * cos1;
  172.  
  173.   b2[0x0C] = b1[0x0C] + b1[0x0F];
  174.   b2[0x0F] = (b1[0x0F] - b1[0x0C]) * cos0;
  175.   b2[0x0D] = b1[0x0D] + b1[0x0E];
  176.   b2[0x0E] = (b1[0x0E] - b1[0x0D]) * cos1;
  177.  
  178.   b2[0x10] = b1[0x10] + b1[0x13];
  179.   b2[0x13] = (b1[0x10] - b1[0x13]) * cos0;
  180.   b2[0x11] = b1[0x11] + b1[0x12];
  181.   b2[0x12] = (b1[0x11] - b1[0x12]) * cos1;
  182.  
  183.   b2[0x14] = b1[0x14] + b1[0x17];
  184.   b2[0x17] = (b1[0x17] - b1[0x14]) * cos0;
  185.   b2[0x15] = b1[0x15] + b1[0x16];
  186.   b2[0x16] = (b1[0x16] - b1[0x15]) * cos1;
  187.  
  188.   b2[0x18] = b1[0x18] + b1[0x1B];
  189.   b2[0x1B] = (b1[0x18] - b1[0x1B]) * cos0;
  190.   b2[0x19] = b1[0x19] + b1[0x1A];
  191.   b2[0x1A] = (b1[0x19] - b1[0x1A]) * cos1;
  192.  
  193.   b2[0x1C] = b1[0x1C] + b1[0x1F];
  194.   b2[0x1F] = (b1[0x1F] - b1[0x1C]) * cos0;
  195.   b2[0x1D] = b1[0x1D] + b1[0x1E];
  196.   b2[0x1E] = (b1[0x1E] - b1[0x1D]) * cos1;
  197.  }
  198.  
  199.  {
  200.   register real const cos0 = pnts[4][0];
  201.  
  202.   b1[0x00] = b2[0x00] + b2[0x01];
  203.   b1[0x01] = (b2[0x00] - b2[0x01]) * cos0;
  204.   b1[0x02] = b2[0x02] + b2[0x03];
  205.   b1[0x03] = (b2[0x03] - b2[0x02]) * cos0;
  206.   b1[0x02] += b1[0x03];
  207.  
  208.   b1[0x04] = b2[0x04] + b2[0x05];
  209.   b1[0x05] = (b2[0x04] - b2[0x05]) * cos0;
  210.   b1[0x06] = b2[0x06] + b2[0x07];
  211.   b1[0x07] = (b2[0x07] - b2[0x06]) * cos0;
  212.   b1[0x06] += b1[0x07];
  213.   b1[0x04] += b1[0x06];
  214.   b1[0x06] += b1[0x05];
  215.   b1[0x05] += b1[0x07];
  216.  
  217.   b1[0x08] = b2[0x08] + b2[0x09];
  218.   b1[0x09] = (b2[0x08] - b2[0x09]) * cos0;
  219.   b1[0x0A] = b2[0x0A] + b2[0x0B];
  220.   b1[0x0B] = (b2[0x0B] - b2[0x0A]) * cos0;
  221.   b1[0x0A] += b1[0x0B];
  222.  
  223.   b1[0x0C] = b2[0x0C] + b2[0x0D];
  224.   b1[0x0D] = (b2[0x0C] - b2[0x0D]) * cos0;
  225.   b1[0x0E] = b2[0x0E] + b2[0x0F];
  226.   b1[0x0F] = (b2[0x0F] - b2[0x0E]) * cos0;
  227.   b1[0x0E] += b1[0x0F];
  228.   b1[0x0C] += b1[0x0E];
  229.   b1[0x0E] += b1[0x0D];
  230.   b1[0x0D] += b1[0x0F];
  231.  
  232.   b1[0x10] = b2[0x10] + b2[0x11];
  233.   b1[0x11] = (b2[0x10] - b2[0x11]) * cos0;
  234.   b1[0x12] = b2[0x12] + b2[0x13];
  235.   b1[0x13] = (b2[0x13] - b2[0x12]) * cos0;
  236.   b1[0x12] += b1[0x13];
  237.  
  238.   b1[0x14] = b2[0x14] + b2[0x15];
  239.   b1[0x15] = (b2[0x14] - b2[0x15]) * cos0;
  240.   b1[0x16] = b2[0x16] + b2[0x17];
  241.   b1[0x17] = (b2[0x17] - b2[0x16]) * cos0;
  242.   b1[0x16] += b1[0x17];
  243.   b1[0x14] += b1[0x16];
  244.   b1[0x16] += b1[0x15];
  245.   b1[0x15] += b1[0x17];
  246.  
  247.   b1[0x18] = b2[0x18] + b2[0x19];
  248.   b1[0x19] = (b2[0x18] - b2[0x19]) * cos0;
  249.   b1[0x1A] = b2[0x1A] + b2[0x1B];
  250.   b1[0x1B] = (b2[0x1B] - b2[0x1A]) * cos0;
  251.   b1[0x1A] += b1[0x1B];
  252.  
  253.   b1[0x1C] = b2[0x1C] + b2[0x1D];
  254.   b1[0x1D] = (b2[0x1C] - b2[0x1D]) * cos0;
  255.   b1[0x1E] = b2[0x1E] + b2[0x1F];
  256.   b1[0x1F] = (b2[0x1F] - b2[0x1E]) * cos0;
  257.   b1[0x1E] += b1[0x1F];
  258.   b1[0x1C] += b1[0x1E];
  259.   b1[0x1E] += b1[0x1D];
  260.   b1[0x1D] += b1[0x1F];
  261.  }
  262.  
  263.  out0[0x10*16] = b1[0x00];
  264.  out0[0x10*12] = b1[0x04];
  265.  out0[0x10* 8] = b1[0x02];
  266.  out0[0x10* 4] = b1[0x06];
  267.  out0[0x10* 0] = b1[0x01];
  268.  out1[0x10* 0] = b1[0x01];
  269.  out1[0x10* 4] = b1[0x05];
  270.  out1[0x10* 8] = b1[0x03];
  271.  out1[0x10*12] = b1[0x07];
  272.  
  273. #if 1
  274.  out0[0x10*14] = b1[0x08] + b1[0x0C];
  275.  out0[0x10*10] = b1[0x0C] + b1[0x0a];
  276.  out0[0x10* 6] = b1[0x0A] + b1[0x0E];
  277.  out0[0x10* 2] = b1[0x0E] + b1[0x09];
  278.  out1[0x10* 2] = b1[0x09] + b1[0x0D];
  279.  out1[0x10* 6] = b1[0x0D] + b1[0x0B];
  280.  out1[0x10*10] = b1[0x0B] + b1[0x0F];
  281.  out1[0x10*14] = b1[0x0F];
  282. #else
  283.  b1[0x08] += b1[0x0C];
  284.  out0[0x10*14] = b1[0x08];
  285.  b1[0x0C] += b1[0x0a];
  286.  out0[0x10*10] = b1[0x0C];
  287.  b1[0x0A] += b1[0x0E];
  288.  out0[0x10* 6] = b1[0x0A];
  289.  b1[0x0E] += b1[0x09];
  290.  out0[0x10* 2] = b1[0x0E];
  291.  b1[0x09] += b1[0x0D];
  292.  out1[0x10* 2] = b1[0x09];
  293.  b1[0x0D] += b1[0x0B];
  294.  out1[0x10* 6] = b1[0x0D];
  295.  b1[0x0B] += b1[0x0F];
  296.  out1[0x10*10] = b1[0x0B];
  297.  out1[0x10*14] = b1[0x0F];
  298. #endif
  299.  
  300.  {
  301.  real tmp;
  302.  tmp = b1[0x18] + b1[0x1C];
  303.  out0[0x10*15] = tmp + b1[0x10];
  304.  out0[0x10*13] = tmp + b1[0x14];
  305.  tmp = b1[0x1C] + b1[0x1A];
  306.  out0[0x10*11] = tmp + b1[0x14];
  307.  out0[0x10* 9] = tmp + b1[0x12];
  308.  tmp = b1[0x1A] + b1[0x1E];
  309.  out0[0x10* 7] = tmp + b1[0x12];
  310.  out0[0x10* 5] = tmp + b1[0x16];
  311.  tmp = b1[0x1E] + b1[0x19];
  312.  out0[0x10* 3] = tmp + b1[0x16];
  313.  out0[0x10* 1] = tmp + b1[0x11];
  314.  tmp = b1[0x19] + b1[0x1D];
  315.  out1[0x10* 1] = tmp + b1[0x11];
  316.  out1[0x10* 3] = tmp + b1[0x15];
  317.  tmp = b1[0x1D] + b1[0x1B];
  318.  out1[0x10* 5] = tmp + b1[0x15];
  319.  out1[0x10* 7] = tmp + b1[0x13];
  320.  tmp = b1[0x1B] + b1[0x1F];
  321.  out1[0x10* 9] = tmp + b1[0x13];
  322.  out1[0x10*11] = tmp + b1[0x17];
  323.  out1[0x10*13] = b1[0x17] + b1[0x1F];
  324.  out1[0x10*15] = b1[0x1F];
  325.  }
  326. }
  327.  
  328. /*
  329.  * the call via dct64 is a trick to force GCC to use
  330.  * (new) registers for the b1,b2 pointer to the bufs[xx] field
  331.  */
  332. void dct64(real *a,real *b,real *c)
  333. {
  334.   real bufs[0x40];
  335.   dct64_1(a,b,bufs,bufs+0x20,c);
  336. }
  337.  
  338.