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FFmpeg/libavcodec/ppc/fdct_altivec.c

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  1. /* ffmpeg/libavcodec/ppc/fdct_altivec.c, this file is part of the

  2.  * AltiVec optimized library for the FFMPEG Multimedia System

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

  4.  *

  5.  * This library is free software; you can redistribute it and/or

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

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

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

  9.  *

  10.  * This library is distributed in the hope that it will be useful,

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

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

  13.  * Lesser General Public License for more details.

  14.  *

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

  16.  * License along with this library; if not, write to the Free Software

  17.  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  18.  */

  19. 

  20. 

  21. #include "../common.h"

  22. #include "../dsputil.h"

  23. #include "dsputil_altivec.h"

  24. #include "gcc_fixes.h"

  25. 

  26. 

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

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

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

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

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

  32. 

  33. 

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

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

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

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

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

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

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

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

  42. 

  43. 

  44. #define W0 -(2 * C2)

  45. #define W1 (2 * C6)

  46. #define W2 (SQRT_2 * C6)

  47. #define W3 (SQRT_2 * C3)

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

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

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

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

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

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

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

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

  56. 

  57. 

  58. static vector float fdctconsts[3] = {

  59.     (vector float)AVV( W0, W1, W2, W3 ),

  60.     (vector float)AVV( W4, W5, W6, W7 ),

  61.     (vector float)AVV( W8, W9, WA, WB )

  62. };

  63. 

  64. #define LD_W0 vec_splat(cnsts0, 0)

  65. #define LD_W1 vec_splat(cnsts0, 1)

  66. #define LD_W2 vec_splat(cnsts0, 2)

  67. #define LD_W3 vec_splat(cnsts0, 3)

  68. #define LD_W4 vec_splat(cnsts1, 0)

  69. #define LD_W5 vec_splat(cnsts1, 1)

  70. #define LD_W6 vec_splat(cnsts1, 2)

  71. #define LD_W7 vec_splat(cnsts1, 3)

  72. #define LD_W8 vec_splat(cnsts2, 0)

  73. #define LD_W9 vec_splat(cnsts2, 1)

  74. #define LD_WA vec_splat(cnsts2, 2)

  75. #define LD_WB vec_splat(cnsts2, 3)

  76. 

  77. 

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

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

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

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

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

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

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

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

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

  87.                                                                     \

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

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

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

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

  92.                                                                     \

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

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

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

  96.     cnst = LD_W2;                                                   \

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

  98.     cnst = LD_W1;                                                   \

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

  100.     cnst = LD_W0;                                                   \

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

  102.                                                                     \

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

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

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

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

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

  108.     cnst = LD_W3;                                                   \

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

  110.                                                                     \

  111.     cnst = LD_W8;                                                   \

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

  113.     cnst = LD_W9;                                                   \

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

  115.     cnst = LD_WA;                                                   \

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

  117.     cnst = LD_WB;                                                   \

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

  119.                                                                     \

  120.     cnst = LD_W4;                                                   \

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

  122.     cnst = LD_W5;                                                   \

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

  124.     cnst = LD_W6;                                                   \

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

  126.     cnst = LD_W7;                                                   \

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

  128.                                                                     \

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

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

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

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

  133.     /* }}} */

  134. 

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

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

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

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

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

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

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

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

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

  144.                                                                     \

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

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

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

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

  149.                                                                     \

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

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

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

  153.     cnst = LD_W2;                                                   \

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

  155.     cnst = LD_W1;                                                   \

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

  157.     cnst = LD_W0;                                                   \

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

  159.                                                                     \

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

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

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

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

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

  165.     cnst = LD_W3;                                                   \

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

  167.                                                                     \

  168.     cnst = LD_W8;                                                   \

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

  170.     cnst = LD_W9;                                                   \

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

  172.     cnst = LD_WA;                                                   \

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

  174.     cnst = LD_WB;                                                   \

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

  176.                                                                     \

  177.     cnst = LD_W4;                                                   \

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

  179.     cnst = LD_W5;                                                   \

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

  181.     cnst = LD_W6;                                                   \

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

  183.     cnst = LD_W7;                                                   \

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

  185.                                                                     \

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

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

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

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

  190.     /* }}} */

  191. 

  192. 

  193. 

  194. /* two dimensional discrete cosine transform */

  195. 

  196. void fdct_altivec(int16_t *block)

  197. {

  198. POWERPC_PERF_DECLARE(altivec_fdct, 1);

  199. #ifdef ALTIVEC_USE_REFERENCE_C_CODE

  200. POWERPC_PERF_START_COUNT(altivec_fdct, 1);

  201.     void ff_jpeg_fdct_islow(int16_t *block);

  202.     ff_jpeg_fdct_islow(block);

  203. POWERPC_PERF_STOP_COUNT(altivec_fdct, 1);

  204. #else /* ALTIVEC_USE_REFERENCE_C_CODE */

  205.     vector signed short *bp;

  206.     vector float *cp;

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

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

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

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

  211. 

  212.     POWERPC_PERF_START_COUNT(altivec_fdct, 1);

  213. 

  214. 

  215.     /* setup constants {{{ */

  216.     /* mzero = -0.0 */

  217.     vu32(mzero) = vec_splat_u32(-1);

  218.     vu32(mzero) = vec_sl(vu32(mzero), vu32(mzero));

  219.     cp = fdctconsts;

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

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

  222.     cnsts2 = vec_ld(0, cp);

  223.     /* }}} */

  224. 

  225. 

  226.     /* 8x8 matrix transpose (vector short[8]) {{{ */

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

  228. 

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

  230.     vs16(b00) = vec_ld(0,    bp);

  231.     vs16(b40) = vec_ld(16*4, bp);

  232.     vs16(b01) = MERGE_S16(h, b00, b40);

  233.     vs16(b11) = MERGE_S16(l, b00, b40);

  234.     bp++;

  235.     vs16(b10) = vec_ld(0,    bp);

  236.     vs16(b50) = vec_ld(16*4, bp);

  237.     vs16(b21) = MERGE_S16(h, b10, b50);

  238.     vs16(b31) = MERGE_S16(l, b10, b50);

  239.     bp++;

  240.     vs16(b20) = vec_ld(0,    bp);

  241.     vs16(b60) = vec_ld(16*4, bp);

  242.     vs16(b41) = MERGE_S16(h, b20, b60);

  243.     vs16(b51) = MERGE_S16(l, b20, b60);

  244.     bp++;

  245.     vs16(b30) = vec_ld(0,    bp);

  246.     vs16(b70) = vec_ld(16*4, bp);

  247.     vs16(b61) = MERGE_S16(h, b30, b70);

  248.     vs16(b71) = MERGE_S16(l, b30, b70);

  249. 

  250.     vs16(x0) = MERGE_S16(h, b01, b41);

  251.     vs16(x1) = MERGE_S16(l, b01, b41);

  252.     vs16(x2) = MERGE_S16(h, b11, b51);

  253.     vs16(x3) = MERGE_S16(l, b11, b51);

  254.     vs16(x4) = MERGE_S16(h, b21, b61);

  255.     vs16(x5) = MERGE_S16(l, b21, b61);

  256.     vs16(x6) = MERGE_S16(h, b31, b71);

  257.     vs16(x7) = MERGE_S16(l, b31, b71);

  258. 

  259.     vs16(b00) = MERGE_S16(h, x0, x4);

  260.     vs16(b10) = MERGE_S16(l, x0, x4);

  261.     vs16(b20) = MERGE_S16(h, x1, x5);

  262.     vs16(b30) = MERGE_S16(l, x1, x5);

  263.     vs16(b40) = MERGE_S16(h, x2, x6);

  264.     vs16(b50) = MERGE_S16(l, x2, x6);

  265.     vs16(b60) = MERGE_S16(h, x3, x7);

  266.     vs16(b70) = MERGE_S16(l, x3, x7);

  267. 

  268. #undef MERGE_S16

  269.     /* }}} */

  270. 

  271. 

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

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

  274.  * of this.

  275.  */

  276. #if 1

  277.     /* fdct rows {{{ */

  278.     vs16(x0) = vec_add(vs16(b00), vs16(b70));

  279.     vs16(x7) = vec_sub(vs16(b00), vs16(b70));

  280.     vs16(x1) = vec_add(vs16(b10), vs16(b60));

  281.     vs16(x6) = vec_sub(vs16(b10), vs16(b60));

  282.     vs16(x2) = vec_add(vs16(b20), vs16(b50));

  283.     vs16(x5) = vec_sub(vs16(b20), vs16(b50));

  284.     vs16(x3) = vec_add(vs16(b30), vs16(b40));

  285.     vs16(x4) = vec_sub(vs16(b30), vs16(b40));

  286. 

  287.     vs16(b70) = vec_add(vs16(x0), vs16(x3));

  288.     vs16(b10) = vec_add(vs16(x1), vs16(x2));

  289. 

  290.     vs16(b00) = vec_add(vs16(b70), vs16(b10));

  291.     vs16(b40) = vec_sub(vs16(b70), vs16(b10));

  292. 

  293. #define CTF0(n) \

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

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

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

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

  298. 

  299.     CTF0(0);

  300.     CTF0(4);

  301. 

  302.     vs16(b20) = vec_sub(vs16(x0), vs16(x3));

  303.     vs16(b60) = vec_sub(vs16(x1), vs16(x2));

  304. 

  305.     CTF0(2);

  306.     CTF0(6);

  307. 

  308. #undef CTF0

  309. 

  310.     x0 = vec_add(b60, b20);

  311.     x1 = vec_add(b61, b21);

  312. 

  313.     cnst = LD_W2;

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

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

  316.     cnst = LD_W1;

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

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

  319.     cnst = LD_W0;

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

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

  322. 

  323. #define CTFX(x,b) \

  324.     vs32(b##0) = vec_unpackh(vs16(x)); \

  325.     vs32(b##1) = vec_unpackl(vs16(x)); \

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

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

  328. 

  329.     CTFX(x4, b7);

  330.     CTFX(x5, b5);

  331.     CTFX(x6, b3);

  332.     CTFX(x7, b1);

  333. 

  334. #undef CTFX

  335. 

  336. 

  337.     x0 = vec_add(b70, b10);

  338.     x1 = vec_add(b50, b30);

  339.     x2 = vec_add(b70, b30);

  340.     x3 = vec_add(b50, b10);

  341.     x8 = vec_add(x2, x3);

  342.     cnst = LD_W3;

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

  344. 

  345.     cnst = LD_W8;

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

  347.     cnst = LD_W9;

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

  349.     cnst = LD_WA;

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

  351.     cnst = LD_WB;

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

  353. 

  354.     cnst = LD_W4;

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

  356.     cnst = LD_W5;

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

  358.     cnst = LD_W6;

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

  360.     cnst = LD_W7;

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

  362. 

  363.     b70 = vec_add(b70, x2);

  364.     b50 = vec_add(b50, x3);

  365.     b30 = vec_add(b30, x2);

  366.     b10 = vec_add(b10, x3);

  367. 

  368. 

  369.     x0 = vec_add(b71, b11);

  370.     x1 = vec_add(b51, b31);

  371.     x2 = vec_add(b71, b31);

  372.     x3 = vec_add(b51, b11);

  373.     x8 = vec_add(x2, x3);

  374.     cnst = LD_W3;

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

  376. 

  377.     cnst = LD_W8;

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

  379.     cnst = LD_W9;

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

  381.     cnst = LD_WA;

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

  383.     cnst = LD_WB;

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

  385. 

  386.     cnst = LD_W4;

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

  388.     cnst = LD_W5;

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

  390.     cnst = LD_W6;

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

  392.     cnst = LD_W7;

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

  394. 

  395.     b71 = vec_add(b71, x2);

  396.     b51 = vec_add(b51, x3);

  397.     b31 = vec_add(b31, x2);

  398.     b11 = vec_add(b11, x3);

  399.     /* }}} */

  400. #else

  401.     /* convert to float {{{ */

  402. #define CTF(n) \

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

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

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

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

  407. 

  408.     CTF(0);

  409.     CTF(1);

  410.     CTF(2);

  411.     CTF(3);

  412.     CTF(4);

  413.     CTF(5);

  414.     CTF(6);

  415.     CTF(7);

  416. 

  417. #undef CTF

  418.     /* }}} */

  419. 

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

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

  422. #endif

  423. 

  424. 

  425.     /* 8x8 matrix transpose (vector float[8][2]) {{{ */

  426.     x0 = vec_mergel(b00, b20);

  427.     x1 = vec_mergeh(b00, b20);

  428.     x2 = vec_mergel(b10, b30);

  429.     x3 = vec_mergeh(b10, b30);

  430. 

  431.     b00 = vec_mergeh(x1, x3);

  432.     b10 = vec_mergel(x1, x3);

  433.     b20 = vec_mergeh(x0, x2);

  434.     b30 = vec_mergel(x0, x2);

  435. 

  436.     x4 = vec_mergel(b41, b61);

  437.     x5 = vec_mergeh(b41, b61);

  438.     x6 = vec_mergel(b51, b71);

  439.     x7 = vec_mergeh(b51, b71);

  440. 

  441.     b41 = vec_mergeh(x5, x7);

  442.     b51 = vec_mergel(x5, x7);

  443.     b61 = vec_mergeh(x4, x6);

  444.     b71 = vec_mergel(x4, x6);

  445. 

  446.     x0 = vec_mergel(b01, b21);

  447.     x1 = vec_mergeh(b01, b21);

  448.     x2 = vec_mergel(b11, b31);

  449.     x3 = vec_mergeh(b11, b31);

  450. 

  451.     x4 = vec_mergel(b40, b60);

  452.     x5 = vec_mergeh(b40, b60);

  453.     x6 = vec_mergel(b50, b70);

  454.     x7 = vec_mergeh(b50, b70);

  455. 

  456.     b40 = vec_mergeh(x1, x3);

  457.     b50 = vec_mergel(x1, x3);

  458.     b60 = vec_mergeh(x0, x2);

  459.     b70 = vec_mergel(x0, x2);

  460. 

  461.     b01 = vec_mergeh(x5, x7);

  462.     b11 = vec_mergel(x5, x7);

  463.     b21 = vec_mergeh(x4, x6);

  464.     b31 = vec_mergel(x4, x6);

  465.     /* }}} */

  466. 

  467. 

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

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

  470. 

  471. 

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

  473. #define CTS(n) \

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

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

  476.     vs32(b##n##0) = vec_cts(b##n##0, 0); \

  477.     vs32(b##n##1) = vec_cts(b##n##1, 0); \

  478.     vs16(b##n##0) = vec_pack(vs32(b##n##0), vs32(b##n##1)); \

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

  480. 

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

  482.     CTS(0); bp++;

  483.     CTS(1); bp++;

  484.     CTS(2); bp++;

  485.     CTS(3); bp++;

  486.     CTS(4); bp++;

  487.     CTS(5); bp++;

  488.     CTS(6); bp++;

  489.     CTS(7);

  490. 

  491. #undef CTS

  492.     /* }}} */

  493. 

  494. POWERPC_PERF_STOP_COUNT(altivec_fdct, 1);

  495. #endif /* ALTIVEC_USE_REFERENCE_C_CODE */

  496. }

  497. 

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