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FFmpeg/libavcodec/ppc/fdct_altivec.c

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  1. /*

  2.  * Copyright (C) 2003  James Klicman <james@klicman.org>

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. #include "config.h"

  22. #if HAVE_ALTIVEC_H

  23. #include <altivec.h>

  24. #endif

  25. #include "libavutil/common.h"

  26. #include "libavcodec/dsputil.h"

  27. #include "dsputil_ppc.h"

  28. #include "dsputil_altivec.h"

  29. 

  30. #define vs16(v) ((vector signed short)(v))

  31. #define vs32(v) ((vector signed int)(v))

  32. #define vu8(v)  ((vector unsigned char)(v))

  33. #define vu16(v) ((vector unsigned short)(v))

  34. #define vu32(v) ((vector unsigned int)(v))

  35. 

  36. 

  37. #define C1     0.98078525066375732421875000 /* cos(1*PI/16) */

  38. #define C2     0.92387950420379638671875000 /* cos(2*PI/16) */

  39. #define C3     0.83146959543228149414062500 /* cos(3*PI/16) */

  40. #define C4     0.70710676908493041992187500 /* cos(4*PI/16) */

  41. #define C5     0.55557024478912353515625000 /* cos(5*PI/16) */

  42. #define C6     0.38268342614173889160156250 /* cos(6*PI/16) */

  43. #define C7     0.19509032368659973144531250 /* cos(7*PI/16) */

  44. #define SQRT_2 1.41421353816986083984375000 /* sqrt(2)      */

  45. 

  46. 

  47. #define W0 -(2 * C2)

  48. #define W1 (2 * C6)

  49. #define W2 (SQRT_2 * C6)

  50. #define W3 (SQRT_2 * C3)

  51. #define W4 (SQRT_2 * (-C1 + C3 + C5 - C7))

  52. #define W5 (SQRT_2 * ( C1 + C3 - C5 + C7))

  53. #define W6 (SQRT_2 * ( C1 + C3 + C5 - C7))

  54. #define W7 (SQRT_2 * ( C1 + C3 - C5 - C7))

  55. #define W8 (SQRT_2 * ( C7 - C3))

  56. #define W9 (SQRT_2 * (-C1 - C3))

  57. #define WA (SQRT_2 * (-C3 - C5))

  58. #define WB (SQRT_2 * ( C5 - C3))

  59. 

  60. 

  61. static vector float fdctconsts[3] = {

  62.     { W0, W1, W2, W3 },

  63.     { W4, W5, W6, W7 },

  64.     { W8, W9, WA, WB }

  65. };

  66. 

  67. #define LD_W0 vec_splat(cnsts0, 0)

  68. #define LD_W1 vec_splat(cnsts0, 1)

  69. #define LD_W2 vec_splat(cnsts0, 2)

  70. #define LD_W3 vec_splat(cnsts0, 3)

  71. #define LD_W4 vec_splat(cnsts1, 0)

  72. #define LD_W5 vec_splat(cnsts1, 1)

  73. #define LD_W6 vec_splat(cnsts1, 2)

  74. #define LD_W7 vec_splat(cnsts1, 3)

  75. #define LD_W8 vec_splat(cnsts2, 0)

  76. #define LD_W9 vec_splat(cnsts2, 1)

  77. #define LD_WA vec_splat(cnsts2, 2)

  78. #define LD_WB vec_splat(cnsts2, 3)

  79. 

  80. 

  81. #define FDCTROW(b0,b1,b2,b3,b4,b5,b6,b7) /* {{{ */                  \

  82.     x0 = vec_add(b0, b7);               /* x0 = b0 + b7; */         \

  83.     x7 = vec_sub(b0, b7);               /* x7 = b0 - b7; */         \

  84.     x1 = vec_add(b1, b6);               /* x1 = b1 + b6; */         \

  85.     x6 = vec_sub(b1, b6);               /* x6 = b1 - b6; */         \

  86.     x2 = vec_add(b2, b5);               /* x2 = b2 + b5; */         \

  87.     x5 = vec_sub(b2, b5);               /* x5 = b2 - b5; */         \

  88.     x3 = vec_add(b3, b4);               /* x3 = b3 + b4; */         \

  89.     x4 = vec_sub(b3, b4);               /* x4 = b3 - b4; */         \

  90.                                                                     \

  91.     b7 = vec_add(x0, x3);               /* b7 = x0 + x3; */         \

  92.     b1 = vec_add(x1, x2);               /* b1 = x1 + x2; */         \

  93.     b0 = vec_add(b7, b1);               /* b0 = b7 + b1; */         \

  94.     b4 = vec_sub(b7, b1);               /* b4 = b7 - b1; */         \

  95.                                                                     \

  96.     b2 = vec_sub(x0, x3);               /* b2 = x0 - x3; */         \

  97.     b6 = vec_sub(x1, x2);               /* b6 = x1 - x2; */         \

  98.     b5 = vec_add(b6, b2);               /* b5 = b6 + b2; */         \

  99.     cnst = LD_W2;                                                   \

  100.     b5 = vec_madd(cnst, b5, mzero);     /* b5 = b5 * W2; */         \

  101.     cnst = LD_W1;                                                   \

  102.     b2 = vec_madd(cnst, b2, b5);        /* b2 = b5 + b2 * W1; */    \

  103.     cnst = LD_W0;                                                   \

  104.     b6 = vec_madd(cnst, b6, b5);        /* b6 = b5 + b6 * W0; */    \

  105.                                                                     \

  106.     x0 = vec_add(x4, x7);               /* x0 = x4 + x7; */         \

  107.     x1 = vec_add(x5, x6);               /* x1 = x5 + x6; */         \

  108.     x2 = vec_add(x4, x6);               /* x2 = x4 + x6; */         \

  109.     x3 = vec_add(x5, x7);               /* x3 = x5 + x7; */         \

  110.     x8 = vec_add(x2, x3);               /* x8 = x2 + x3; */         \

  111.     cnst = LD_W3;                                                   \

  112.     x8 = vec_madd(cnst, x8, mzero);     /* x8 = x8 * W3; */         \

  113.                                                                     \

  114.     cnst = LD_W8;                                                   \

  115.     x0 = vec_madd(cnst, x0, mzero);     /* x0 *= W8; */             \

  116.     cnst = LD_W9;                                                   \

  117.     x1 = vec_madd(cnst, x1, mzero);     /* x1 *= W9; */             \

  118.     cnst = LD_WA;                                                   \

  119.     x2 = vec_madd(cnst, x2, x8);        /* x2 = x2 * WA + x8; */    \

  120.     cnst = LD_WB;                                                   \

  121.     x3 = vec_madd(cnst, x3, x8);        /* x3 = x3 * WB + x8; */    \

  122.                                                                     \

  123.     cnst = LD_W4;                                                   \

  124.     b7 = vec_madd(cnst, x4, x0);        /* b7 = x4 * W4 + x0; */    \

  125.     cnst = LD_W5;                                                   \

  126.     b5 = vec_madd(cnst, x5, x1);        /* b5 = x5 * W5 + x1; */    \

  127.     cnst = LD_W6;                                                   \

  128.     b3 = vec_madd(cnst, x6, x1);        /* b3 = x6 * W6 + x1; */    \

  129.     cnst = LD_W7;                                                   \

  130.     b1 = vec_madd(cnst, x7, x0);        /* b1 = x7 * W7 + x0; */    \

  131.                                                                     \

  132.     b7 = vec_add(b7, x2);               /* b7 = b7 + x2; */         \

  133.     b5 = vec_add(b5, x3);               /* b5 = b5 + x3; */         \

  134.     b3 = vec_add(b3, x2);               /* b3 = b3 + x2; */         \

  135.     b1 = vec_add(b1, x3);               /* b1 = b1 + x3; */         \

  136.     /* }}} */

  137. 

  138. #define FDCTCOL(b0,b1,b2,b3,b4,b5,b6,b7) /* {{{ */                  \

  139.     x0 = vec_add(b0, b7);               /* x0 = b0 + b7; */         \

  140.     x7 = vec_sub(b0, b7);               /* x7 = b0 - b7; */         \

  141.     x1 = vec_add(b1, b6);               /* x1 = b1 + b6; */         \

  142.     x6 = vec_sub(b1, b6);               /* x6 = b1 - b6; */         \

  143.     x2 = vec_add(b2, b5);               /* x2 = b2 + b5; */         \

  144.     x5 = vec_sub(b2, b5);               /* x5 = b2 - b5; */         \

  145.     x3 = vec_add(b3, b4);               /* x3 = b3 + b4; */         \

  146.     x4 = vec_sub(b3, b4);               /* x4 = b3 - b4; */         \

  147.                                                                     \

  148.     b7 = vec_add(x0, x3);               /* b7 = x0 + x3; */         \

  149.     b1 = vec_add(x1, x2);               /* b1 = x1 + x2; */         \

  150.     b0 = vec_add(b7, b1);               /* b0 = b7 + b1; */         \

  151.     b4 = vec_sub(b7, b1);               /* b4 = b7 - b1; */         \

  152.                                                                     \

  153.     b2 = vec_sub(x0, x3);               /* b2 = x0 - x3; */         \

  154.     b6 = vec_sub(x1, x2);               /* b6 = x1 - x2; */         \

  155.     b5 = vec_add(b6, b2);               /* b5 = b6 + b2; */         \

  156.     cnst = LD_W2;                                                   \

  157.     b5 = vec_madd(cnst, b5, mzero);     /* b5 = b5 * W2; */         \

  158.     cnst = LD_W1;                                                   \

  159.     b2 = vec_madd(cnst, b2, b5);        /* b2 = b5 + b2 * W1; */    \

  160.     cnst = LD_W0;                                                   \

  161.     b6 = vec_madd(cnst, b6, b5);        /* b6 = b5 + b6 * W0; */    \

  162.                                                                     \

  163.     x0 = vec_add(x4, x7);               /* x0 = x4 + x7; */         \

  164.     x1 = vec_add(x5, x6);               /* x1 = x5 + x6; */         \

  165.     x2 = vec_add(x4, x6);               /* x2 = x4 + x6; */         \

  166.     x3 = vec_add(x5, x7);               /* x3 = x5 + x7; */         \

  167.     x8 = vec_add(x2, x3);               /* x8 = x2 + x3; */         \

  168.     cnst = LD_W3;                                                   \

  169.     x8 = vec_madd(cnst, x8, mzero);     /* x8 = x8 * W3; */         \

  170.                                                                     \

  171.     cnst = LD_W8;                                                   \

  172.     x0 = vec_madd(cnst, x0, mzero);     /* x0 *= W8; */             \

  173.     cnst = LD_W9;                                                   \

  174.     x1 = vec_madd(cnst, x1, mzero);     /* x1 *= W9; */             \

  175.     cnst = LD_WA;                                                   \

  176.     x2 = vec_madd(cnst, x2, x8);        /* x2 = x2 * WA + x8; */    \

  177.     cnst = LD_WB;                                                   \

  178.     x3 = vec_madd(cnst, x3, x8);        /* x3 = x3 * WB + x8; */    \

  179.                                                                     \

  180.     cnst = LD_W4;                                                   \

  181.     b7 = vec_madd(cnst, x4, x0);        /* b7 = x4 * W4 + x0; */    \

  182.     cnst = LD_W5;                                                   \

  183.     b5 = vec_madd(cnst, x5, x1);        /* b5 = x5 * W5 + x1; */    \

  184.     cnst = LD_W6;                                                   \

  185.     b3 = vec_madd(cnst, x6, x1);        /* b3 = x6 * W6 + x1; */    \

  186.     cnst = LD_W7;                                                   \

  187.     b1 = vec_madd(cnst, x7, x0);        /* b1 = x7 * W7 + x0; */    \

  188.                                                                     \

  189.     b7 = vec_add(b7, x2);               /* b7 += x2; */             \

  190.     b5 = vec_add(b5, x3);               /* b5 += x3; */             \

  191.     b3 = vec_add(b3, x2);               /* b3 += x2; */             \

  192.     b1 = vec_add(b1, x3);               /* b1 += x3; */             \

  193.     /* }}} */

  194. 

  195. 

  196. 

  197. /* two dimensional discrete cosine transform */

  198. 

  199. void fdct_altivec(int16_t *block)

  200. {

  201. POWERPC_PERF_DECLARE(altivec_fdct, 1);

  202.     vector signed short *bp;

  203.     vector float *cp;

  204.     vector float b00, b10, b20, b30, b40, b50, b60, b70;

  205.     vector float b01, b11, b21, b31, b41, b51, b61, b71;

  206.     vector float mzero, cnst, cnsts0, cnsts1, cnsts2;

  207.     vector float x0, x1, x2, x3, x4, x5, x6, x7, x8;

  208. 

  209.     POWERPC_PERF_START_COUNT(altivec_fdct, 1);

  210. 

  211. 

  212.     /* setup constants {{{ */

  213.     /* mzero = -0.0 */

  214.     mzero = ((vector float)vec_splat_u32(-1));

  215.     mzero = ((vector float)vec_sl(vu32(mzero), vu32(mzero)));

  216.     cp = fdctconsts;

  217.     cnsts0 = vec_ld(0, cp); cp++;

  218.     cnsts1 = vec_ld(0, cp); cp++;

  219.     cnsts2 = vec_ld(0, cp);

  220.     /* }}} */

  221. 

  222. 

  223.     /* 8x8 matrix transpose (vector short[8]) {{{ */

  224. #define MERGE_S16(hl,a,b) vec_merge##hl(vs16(a), vs16(b))

  225. 

  226.     bp = (vector signed short*)block;

  227.     b00 = ((vector float)vec_ld(0,    bp));

  228.     b40 = ((vector float)vec_ld(16*4, bp));

  229.     b01 = ((vector float)MERGE_S16(h, b00, b40));

  230.     b11 = ((vector float)MERGE_S16(l, b00, b40));

  231.     bp++;

  232.     b10 = ((vector float)vec_ld(0,    bp));

  233.     b50 = ((vector float)vec_ld(16*4, bp));

  234.     b21 = ((vector float)MERGE_S16(h, b10, b50));

  235.     b31 = ((vector float)MERGE_S16(l, b10, b50));

  236.     bp++;

  237.     b20 = ((vector float)vec_ld(0,    bp));

  238.     b60 = ((vector float)vec_ld(16*4, bp));

  239.     b41 = ((vector float)MERGE_S16(h, b20, b60));

  240.     b51 = ((vector float)MERGE_S16(l, b20, b60));

  241.     bp++;

  242.     b30 = ((vector float)vec_ld(0,    bp));

  243.     b70 = ((vector float)vec_ld(16*4, bp));

  244.     b61 = ((vector float)MERGE_S16(h, b30, b70));

  245.     b71 = ((vector float)MERGE_S16(l, b30, b70));

  246. 

  247.     x0 = ((vector float)MERGE_S16(h, b01, b41));

  248.     x1 = ((vector float)MERGE_S16(l, b01, b41));

  249.     x2 = ((vector float)MERGE_S16(h, b11, b51));

  250.     x3 = ((vector float)MERGE_S16(l, b11, b51));

  251.     x4 = ((vector float)MERGE_S16(h, b21, b61));

  252.     x5 = ((vector float)MERGE_S16(l, b21, b61));

  253.     x6 = ((vector float)MERGE_S16(h, b31, b71));

  254.     x7 = ((vector float)MERGE_S16(l, b31, b71));

  255. 

  256.     b00 = ((vector float)MERGE_S16(h, x0, x4));

  257.     b10 = ((vector float)MERGE_S16(l, x0, x4));

  258.     b20 = ((vector float)MERGE_S16(h, x1, x5));

  259.     b30 = ((vector float)MERGE_S16(l, x1, x5));

  260.     b40 = ((vector float)MERGE_S16(h, x2, x6));

  261.     b50 = ((vector float)MERGE_S16(l, x2, x6));

  262.     b60 = ((vector float)MERGE_S16(h, x3, x7));

  263.     b70 = ((vector float)MERGE_S16(l, x3, x7));

  264. 

  265. #undef MERGE_S16

  266.     /* }}} */

  267. 

  268. 

  269. /* Some of the initial calculations can be done as vector short before

  270.  * conversion to vector float.  The following code section takes advantage

  271.  * of this.

  272.  */

  273. #if 1

  274.     /* fdct rows {{{ */

  275.     x0 = ((vector float)vec_add(vs16(b00), vs16(b70)));

  276.     x7 = ((vector float)vec_sub(vs16(b00), vs16(b70)));

  277.     x1 = ((vector float)vec_add(vs16(b10), vs16(b60)));

  278.     x6 = ((vector float)vec_sub(vs16(b10), vs16(b60)));

  279.     x2 = ((vector float)vec_add(vs16(b20), vs16(b50)));

  280.     x5 = ((vector float)vec_sub(vs16(b20), vs16(b50)));

  281.     x3 = ((vector float)vec_add(vs16(b30), vs16(b40)));

  282.     x4 = ((vector float)vec_sub(vs16(b30), vs16(b40)));

  283. 

  284.     b70 = ((vector float)vec_add(vs16(x0), vs16(x3)));

  285.     b10 = ((vector float)vec_add(vs16(x1), vs16(x2)));

  286. 

  287.     b00 = ((vector float)vec_add(vs16(b70), vs16(b10)));

  288.     b40 = ((vector float)vec_sub(vs16(b70), vs16(b10)));

  289. 

  290. #define CTF0(n) \

  291.     b##n##1 = ((vector float)vec_unpackl(vs16(b##n##0))); \

  292.     b##n##0 = ((vector float)vec_unpackh(vs16(b##n##0))); \

  293.     b##n##1 = vec_ctf(vs32(b##n##1), 0); \

  294.     b##n##0 = vec_ctf(vs32(b##n##0), 0);

  295. 

  296.     CTF0(0);

  297.     CTF0(4);

  298. 

  299.     b20 = ((vector float)vec_sub(vs16(x0), vs16(x3)));

  300.     b60 = ((vector float)vec_sub(vs16(x1), vs16(x2)));

  301. 

  302.     CTF0(2);

  303.     CTF0(6);

  304. 

  305. #undef CTF0

  306. 

  307.     x0 = vec_add(b60, b20);

  308.     x1 = vec_add(b61, b21);

  309. 

  310.     cnst = LD_W2;

  311.     x0 = vec_madd(cnst, x0, mzero);

  312.     x1 = vec_madd(cnst, x1, mzero);

  313.     cnst = LD_W1;

  314.     b20 = vec_madd(cnst, b20, x0);

  315.     b21 = vec_madd(cnst, b21, x1);

  316.     cnst = LD_W0;

  317.     b60 = vec_madd(cnst, b60, x0);

  318.     b61 = vec_madd(cnst, b61, x1);

  319. 

  320. #define CTFX(x,b) \

  321.     b##0 = ((vector float)vec_unpackh(vs16(x))); \

  322.     b##1 = ((vector float)vec_unpackl(vs16(x))); \

  323.     b##0 = vec_ctf(vs32(b##0), 0); \

  324.     b##1 = vec_ctf(vs32(b##1), 0); \

  325. 

  326.     CTFX(x4, b7);

  327.     CTFX(x5, b5);

  328.     CTFX(x6, b3);

  329.     CTFX(x7, b1);

  330. 

  331. #undef CTFX

  332. 

  333. 

  334.     x0 = vec_add(b70, b10);

  335.     x1 = vec_add(b50, b30);

  336.     x2 = vec_add(b70, b30);

  337.     x3 = vec_add(b50, b10);

  338.     x8 = vec_add(x2, x3);

  339.     cnst = LD_W3;

  340.     x8 = vec_madd(cnst, x8, mzero);

  341. 

  342.     cnst = LD_W8;

  343.     x0 = vec_madd(cnst, x0, mzero);

  344.     cnst = LD_W9;

  345.     x1 = vec_madd(cnst, x1, mzero);

  346.     cnst = LD_WA;

  347.     x2 = vec_madd(cnst, x2, x8);

  348.     cnst = LD_WB;

  349.     x3 = vec_madd(cnst, x3, x8);

  350. 

  351.     cnst = LD_W4;

  352.     b70 = vec_madd(cnst, b70, x0);

  353.     cnst = LD_W5;

  354.     b50 = vec_madd(cnst, b50, x1);

  355.     cnst = LD_W6;

  356.     b30 = vec_madd(cnst, b30, x1);

  357.     cnst = LD_W7;

  358.     b10 = vec_madd(cnst, b10, x0);

  359. 

  360.     b70 = vec_add(b70, x2);

  361.     b50 = vec_add(b50, x3);

  362.     b30 = vec_add(b30, x2);

  363.     b10 = vec_add(b10, x3);

  364. 

  365. 

  366.     x0 = vec_add(b71, b11);

  367.     x1 = vec_add(b51, b31);

  368.     x2 = vec_add(b71, b31);

  369.     x3 = vec_add(b51, b11);

  370.     x8 = vec_add(x2, x3);

  371.     cnst = LD_W3;

  372.     x8 = vec_madd(cnst, x8, mzero);

  373. 

  374.     cnst = LD_W8;

  375.     x0 = vec_madd(cnst, x0, mzero);

  376.     cnst = LD_W9;

  377.     x1 = vec_madd(cnst, x1, mzero);

  378.     cnst = LD_WA;

  379.     x2 = vec_madd(cnst, x2, x8);

  380.     cnst = LD_WB;

  381.     x3 = vec_madd(cnst, x3, x8);

  382. 

  383.     cnst = LD_W4;

  384.     b71 = vec_madd(cnst, b71, x0);

  385.     cnst = LD_W5;

  386.     b51 = vec_madd(cnst, b51, x1);

  387.     cnst = LD_W6;

  388.     b31 = vec_madd(cnst, b31, x1);

  389.     cnst = LD_W7;

  390.     b11 = vec_madd(cnst, b11, x0);

  391. 

  392.     b71 = vec_add(b71, x2);

  393.     b51 = vec_add(b51, x3);

  394.     b31 = vec_add(b31, x2);

  395.     b11 = vec_add(b11, x3);

  396.     /* }}} */

  397. #else

  398.     /* convert to float {{{ */

  399. #define CTF(n) \

  400.     vs32(b##n##1) = vec_unpackl(vs16(b##n##0)); \

  401.     vs32(b##n##0) = vec_unpackh(vs16(b##n##0)); \

  402.     b##n##1 = vec_ctf(vs32(b##n##1), 0); \

  403.     b##n##0 = vec_ctf(vs32(b##n##0), 0); \

  404. 

  405.     CTF(0);

  406.     CTF(1);

  407.     CTF(2);

  408.     CTF(3);

  409.     CTF(4);

  410.     CTF(5);

  411.     CTF(6);

  412.     CTF(7);

  413. 

  414. #undef CTF

  415.     /* }}} */

  416. 

  417.     FDCTROW(b00, b10, b20, b30, b40, b50, b60, b70);

  418.     FDCTROW(b01, b11, b21, b31, b41, b51, b61, b71);

  419. #endif

  420. 

  421. 

  422.     /* 8x8 matrix transpose (vector float[8][2]) {{{ */

  423.     x0 = vec_mergel(b00, b20);

  424.     x1 = vec_mergeh(b00, b20);

  425.     x2 = vec_mergel(b10, b30);

  426.     x3 = vec_mergeh(b10, b30);

  427. 

  428.     b00 = vec_mergeh(x1, x3);

  429.     b10 = vec_mergel(x1, x3);

  430.     b20 = vec_mergeh(x0, x2);

  431.     b30 = vec_mergel(x0, x2);

  432. 

  433.     x4 = vec_mergel(b41, b61);

  434.     x5 = vec_mergeh(b41, b61);

  435.     x6 = vec_mergel(b51, b71);

  436.     x7 = vec_mergeh(b51, b71);

  437. 

  438.     b41 = vec_mergeh(x5, x7);

  439.     b51 = vec_mergel(x5, x7);

  440.     b61 = vec_mergeh(x4, x6);

  441.     b71 = vec_mergel(x4, x6);

  442. 

  443.     x0 = vec_mergel(b01, b21);

  444.     x1 = vec_mergeh(b01, b21);

  445.     x2 = vec_mergel(b11, b31);

  446.     x3 = vec_mergeh(b11, b31);

  447. 

  448.     x4 = vec_mergel(b40, b60);

  449.     x5 = vec_mergeh(b40, b60);

  450.     x6 = vec_mergel(b50, b70);

  451.     x7 = vec_mergeh(b50, b70);

  452. 

  453.     b40 = vec_mergeh(x1, x3);

  454.     b50 = vec_mergel(x1, x3);

  455.     b60 = vec_mergeh(x0, x2);

  456.     b70 = vec_mergel(x0, x2);

  457. 

  458.     b01 = vec_mergeh(x5, x7);

  459.     b11 = vec_mergel(x5, x7);

  460.     b21 = vec_mergeh(x4, x6);

  461.     b31 = vec_mergel(x4, x6);

  462.     /* }}} */

  463. 

  464. 

  465.     FDCTCOL(b00, b10, b20, b30, b40, b50, b60, b70);

  466.     FDCTCOL(b01, b11, b21, b31, b41, b51, b61, b71);

  467. 

  468. 

  469.     /* round, convert back to short {{{ */

  470. #define CTS(n) \

  471.     b##n##0 = vec_round(b##n##0); \

  472.     b##n##1 = vec_round(b##n##1); \

  473.     b##n##0 = ((vector float)vec_cts(b##n##0, 0)); \

  474.     b##n##1 = ((vector float)vec_cts(b##n##1, 0)); \

  475.     b##n##0 = ((vector float)vec_pack(vs32(b##n##0), vs32(b##n##1))); \

  476.     vec_st(vs16(b##n##0), 0, bp);

  477. 

  478.     bp = (vector signed short*)block;

  479.     CTS(0); bp++;

  480.     CTS(1); bp++;

  481.     CTS(2); bp++;

  482.     CTS(3); bp++;

  483.     CTS(4); bp++;

  484.     CTS(5); bp++;

  485.     CTS(6); bp++;

  486.     CTS(7);

  487. 

  488. #undef CTS

  489.     /* }}} */

  490. 

  491. POWERPC_PERF_STOP_COUNT(altivec_fdct, 1);

  492. }

  493. 

  494. /* vim:set foldmethod=marker foldlevel=0: */