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FFmpeg/libavcodec/i386/idct_mmx.c

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  1. /*

  2.  * idct_mmx.c

  3.  * Copyright (C) 1999-2001 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>

  4.  *

  5.  * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.

  6.  *

  7.  * mpeg2dec is free software; you can redistribute it and/or modify

  8.  * it under the terms of the GNU General Public License as published by

  9.  * the Free Software Foundation; either version 2 of the License, or

  10.  * (at your option) any later version.

  11.  *

  12.  * mpeg2dec is distributed in the hope that it will be useful,

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

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  15.  * GNU General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU General Public License

  18.  * along with mpeg2dec; if not, write to the Free Software

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

  20.  */

  21. 

  22. #include "common.h"

  23. #include "../dsputil.h"

  24. 

  25. #include "mmx.h"

  26. 

  27. #define ATTR_ALIGN(align) __attribute__ ((__aligned__ (align)))

  28. 

  29. #define ROW_SHIFT 11

  30. #define COL_SHIFT 6

  31. 

  32. #define round(bias) ((int)(((bias)+0.5) * (1<<ROW_SHIFT)))

  33. #define rounder(bias) {round (bias), round (bias)}

  34. 

  35. #if 0

  36. /* C row IDCT - its just here to document the MMXEXT and MMX versions */

  37. static inline void idct_row (int16_t * row, int offset,

  38.                              int16_t * table, int32_t * rounder)

  39. {

  40.     int C1, C2, C3, C4, C5, C6, C7;

  41.     int a0, a1, a2, a3, b0, b1, b2, b3;

  42. 

  43.     row += offset;

  44. 

  45.     C1 = table[1];

  46.     C2 = table[2];

  47.     C3 = table[3];

  48.     C4 = table[4];

  49.     C5 = table[5];

  50.     C6 = table[6];

  51.     C7 = table[7];

  52. 

  53.     a0 = C4*row[0] + C2*row[2] + C4*row[4] + C6*row[6] + *rounder;

  54.     a1 = C4*row[0] + C6*row[2] - C4*row[4] - C2*row[6] + *rounder;

  55.     a2 = C4*row[0] - C6*row[2] - C4*row[4] + C2*row[6] + *rounder;

  56.     a3 = C4*row[0] - C2*row[2] + C4*row[4] - C6*row[6] + *rounder;

  57. 

  58.     b0 = C1*row[1] + C3*row[3] + C5*row[5] + C7*row[7];

  59.     b1 = C3*row[1] - C7*row[3] - C1*row[5] - C5*row[7];

  60.     b2 = C5*row[1] - C1*row[3] + C7*row[5] + C3*row[7];

  61.     b3 = C7*row[1] - C5*row[3] + C3*row[5] - C1*row[7];

  62. 

  63.     row[0] = (a0 + b0) >> ROW_SHIFT;

  64.     row[1] = (a1 + b1) >> ROW_SHIFT;

  65.     row[2] = (a2 + b2) >> ROW_SHIFT;

  66.     row[3] = (a3 + b3) >> ROW_SHIFT;

  67.     row[4] = (a3 - b3) >> ROW_SHIFT;

  68.     row[5] = (a2 - b2) >> ROW_SHIFT;

  69.     row[6] = (a1 - b1) >> ROW_SHIFT;

  70.     row[7] = (a0 - b0) >> ROW_SHIFT;

  71. }

  72. #endif

  73. 

  74. 

  75. /* MMXEXT row IDCT */

  76. 

  77. #define mmxext_table(c1,c2,c3,c4,c5,c6,c7)      {  c4,  c2, -c4, -c2,   \

  78.                                                    c4,  c6,  c4,  c6,   \

  79.                                                    c1,  c3, -c1, -c5,   \

  80.                                                    c5,  c7,  c3, -c7,   \

  81.                                                    c4, -c6,  c4, -c6,   \

  82.                                                   -c4,  c2,  c4, -c2,   \

  83.                                                    c5, -c1,  c3, -c1,   \

  84.                                                    c7,  c3,  c7, -c5 }

  85. 

  86. static inline void mmxext_row_head (int16_t * row, int offset, const int16_t * table)

  87. {

  88.     movq_m2r (*(row+offset), mm2);      // mm2 = x6 x4 x2 x0

  89. 

  90.     movq_m2r (*(row+offset+4), mm5);    // mm5 = x7 x5 x3 x1

  91.     movq_r2r (mm2, mm0);                // mm0 = x6 x4 x2 x0

  92. 

  93.     movq_m2r (*table, mm3);             // mm3 = -C2 -C4 C2 C4

  94.     movq_r2r (mm5, mm6);                // mm6 = x7 x5 x3 x1

  95. 

  96.     movq_m2r (*(table+4), mm4);         // mm4 = C6 C4 C6 C4

  97.     pmaddwd_r2r (mm0, mm3);             // mm3 = -C4*x4-C2*x6 C4*x0+C2*x2

  98. 

  99.     pshufw_r2r (mm2, mm2, 0x4e);        // mm2 = x2 x0 x6 x4

  100. }

  101. 

  102. static inline void mmxext_row (const int16_t * table, const int32_t * rounder)

  103. {

  104.     movq_m2r (*(table+8), mm1);         // mm1 = -C5 -C1 C3 C1

  105.     pmaddwd_r2r (mm2, mm4);             // mm4 = C4*x0+C6*x2 C4*x4+C6*x6

  106. 

  107.     pmaddwd_m2r (*(table+16), mm0);     // mm0 = C4*x4-C6*x6 C4*x0-C6*x2

  108.     pshufw_r2r (mm6, mm6, 0x4e);        // mm6 = x3 x1 x7 x5

  109. 

  110.     movq_m2r (*(table+12), mm7);        // mm7 = -C7 C3 C7 C5

  111.     pmaddwd_r2r (mm5, mm1);             // mm1 = -C1*x5-C5*x7 C1*x1+C3*x3

  112. 

  113.     paddd_m2r (*rounder, mm3);          // mm3 += rounder

  114.     pmaddwd_r2r (mm6, mm7);             // mm7 = C3*x1-C7*x3 C5*x5+C7*x7

  115. 

  116.     pmaddwd_m2r (*(table+20), mm2);     // mm2 = C4*x0-C2*x2 -C4*x4+C2*x6

  117.     paddd_r2r (mm4, mm3);               // mm3 = a1 a0 + rounder

  118. 

  119.     pmaddwd_m2r (*(table+24), mm5);     // mm5 = C3*x5-C1*x7 C5*x1-C1*x3

  120.     movq_r2r (mm3, mm4);                // mm4 = a1 a0 + rounder

  121. 

  122.     pmaddwd_m2r (*(table+28), mm6);     // mm6 = C7*x1-C5*x3 C7*x5+C3*x7

  123.     paddd_r2r (mm7, mm1);               // mm1 = b1 b0

  124. 

  125.     paddd_m2r (*rounder, mm0);          // mm0 += rounder

  126.     psubd_r2r (mm1, mm3);               // mm3 = a1-b1 a0-b0 + rounder

  127. 

  128.     psrad_i2r (ROW_SHIFT, mm3);         // mm3 = y6 y7

  129.     paddd_r2r (mm4, mm1);               // mm1 = a1+b1 a0+b0 + rounder

  130. 

  131.     paddd_r2r (mm2, mm0);               // mm0 = a3 a2 + rounder

  132.     psrad_i2r (ROW_SHIFT, mm1);         // mm1 = y1 y0

  133. 

  134.     paddd_r2r (mm6, mm5);               // mm5 = b3 b2

  135.     movq_r2r (mm0, mm4);                // mm4 = a3 a2 + rounder

  136. 

  137.     paddd_r2r (mm5, mm0);               // mm0 = a3+b3 a2+b2 + rounder

  138.     psubd_r2r (mm5, mm4);               // mm4 = a3-b3 a2-b2 + rounder

  139. }

  140. 

  141. static inline void mmxext_row_tail (int16_t * row, int store)

  142. {

  143.     psrad_i2r (ROW_SHIFT, mm0);         // mm0 = y3 y2

  144. 

  145.     psrad_i2r (ROW_SHIFT, mm4);         // mm4 = y4 y5

  146. 

  147.     packssdw_r2r (mm0, mm1);            // mm1 = y3 y2 y1 y0

  148. 

  149.     packssdw_r2r (mm3, mm4);            // mm4 = y6 y7 y4 y5

  150. 

  151.     movq_r2m (mm1, *(row+store));       // save y3 y2 y1 y0

  152.     pshufw_r2r (mm4, mm4, 0xb1);        // mm4 = y7 y6 y5 y4

  153. 

  154.     /* slot */

  155. 

  156.     movq_r2m (mm4, *(row+store+4));     // save y7 y6 y5 y4

  157. }

  158. 

  159. static inline void mmxext_row_mid (int16_t * row, int store,

  160.                                    int offset, const int16_t * table)

  161. {

  162.     movq_m2r (*(row+offset), mm2);      // mm2 = x6 x4 x2 x0

  163.     psrad_i2r (ROW_SHIFT, mm0);         // mm0 = y3 y2

  164. 

  165.     movq_m2r (*(row+offset+4), mm5);    // mm5 = x7 x5 x3 x1

  166.     psrad_i2r (ROW_SHIFT, mm4);         // mm4 = y4 y5

  167. 

  168.     packssdw_r2r (mm0, mm1);            // mm1 = y3 y2 y1 y0

  169.     movq_r2r (mm5, mm6);                // mm6 = x7 x5 x3 x1

  170. 

  171.     packssdw_r2r (mm3, mm4);            // mm4 = y6 y7 y4 y5

  172.     movq_r2r (mm2, mm0);                // mm0 = x6 x4 x2 x0

  173. 

  174.     movq_r2m (mm1, *(row+store));       // save y3 y2 y1 y0

  175.     pshufw_r2r (mm4, mm4, 0xb1);        // mm4 = y7 y6 y5 y4

  176. 

  177.     movq_m2r (*table, mm3);             // mm3 = -C2 -C4 C2 C4

  178.     movq_r2m (mm4, *(row+store+4));     // save y7 y6 y5 y4

  179. 

  180.     pmaddwd_r2r (mm0, mm3);             // mm3 = -C4*x4-C2*x6 C4*x0+C2*x2

  181. 

  182.     movq_m2r (*(table+4), mm4);         // mm4 = C6 C4 C6 C4

  183.     pshufw_r2r (mm2, mm2, 0x4e);        // mm2 = x2 x0 x6 x4

  184. }

  185. 

  186. 

  187. /* MMX row IDCT */

  188. 

  189. #define mmx_table(c1,c2,c3,c4,c5,c6,c7) {  c4,  c2,  c4,  c6,   \

  190.                                            c4,  c6, -c4, -c2,   \

  191.                                            c1,  c3,  c3, -c7,   \

  192.                                            c5,  c7, -c1, -c5,   \

  193.                                            c4, -c6,  c4, -c2,   \

  194.                                           -c4,  c2,  c4, -c6,   \

  195.                                            c5, -c1,  c7, -c5,   \

  196.                                            c7,  c3,  c3, -c1 }

  197. 

  198. static inline void mmx_row_head (int16_t * row, int offset, const int16_t * table)

  199. {

  200.     movq_m2r (*(row+offset), mm2);      // mm2 = x6 x4 x2 x0

  201. 

  202.     movq_m2r (*(row+offset+4), mm5);    // mm5 = x7 x5 x3 x1

  203.     movq_r2r (mm2, mm0);                // mm0 = x6 x4 x2 x0

  204. 

  205.     movq_m2r (*table, mm3);             // mm3 = C6 C4 C2 C4

  206.     movq_r2r (mm5, mm6);                // mm6 = x7 x5 x3 x1

  207. 

  208.     punpckldq_r2r (mm0, mm0);           // mm0 = x2 x0 x2 x0

  209. 

  210.     movq_m2r (*(table+4), mm4);         // mm4 = -C2 -C4 C6 C4

  211.     pmaddwd_r2r (mm0, mm3);             // mm3 = C4*x0+C6*x2 C4*x0+C2*x2

  212. 

  213.     movq_m2r (*(table+8), mm1);         // mm1 = -C7 C3 C3 C1

  214.     punpckhdq_r2r (mm2, mm2);           // mm2 = x6 x4 x6 x4

  215. }

  216. 

  217. static inline void mmx_row (const int16_t * table, const int32_t * rounder)

  218. {

  219.     pmaddwd_r2r (mm2, mm4);             // mm4 = -C4*x4-C2*x6 C4*x4+C6*x6

  220.     punpckldq_r2r (mm5, mm5);           // mm5 = x3 x1 x3 x1

  221. 

  222.     pmaddwd_m2r (*(table+16), mm0);     // mm0 = C4*x0-C2*x2 C4*x0-C6*x2

  223.     punpckhdq_r2r (mm6, mm6);           // mm6 = x7 x5 x7 x5

  224. 

  225.     movq_m2r (*(table+12), mm7);        // mm7 = -C5 -C1 C7 C5

  226.     pmaddwd_r2r (mm5, mm1);             // mm1 = C3*x1-C7*x3 C1*x1+C3*x3

  227. 

  228.     paddd_m2r (*rounder, mm3);          // mm3 += rounder

  229.     pmaddwd_r2r (mm6, mm7);             // mm7 = -C1*x5-C5*x7 C5*x5+C7*x7

  230. 

  231.     pmaddwd_m2r (*(table+20), mm2);     // mm2 = C4*x4-C6*x6 -C4*x4+C2*x6

  232.     paddd_r2r (mm4, mm3);               // mm3 = a1 a0 + rounder

  233. 

  234.     pmaddwd_m2r (*(table+24), mm5);     // mm5 = C7*x1-C5*x3 C5*x1-C1*x3

  235.     movq_r2r (mm3, mm4);                // mm4 = a1 a0 + rounder

  236. 

  237.     pmaddwd_m2r (*(table+28), mm6);     // mm6 = C3*x5-C1*x7 C7*x5+C3*x7

  238.     paddd_r2r (mm7, mm1);               // mm1 = b1 b0

  239. 

  240.     paddd_m2r (*rounder, mm0);          // mm0 += rounder

  241.     psubd_r2r (mm1, mm3);               // mm3 = a1-b1 a0-b0 + rounder

  242. 

  243.     psrad_i2r (ROW_SHIFT, mm3);         // mm3 = y6 y7

  244.     paddd_r2r (mm4, mm1);               // mm1 = a1+b1 a0+b0 + rounder

  245. 

  246.     paddd_r2r (mm2, mm0);               // mm0 = a3 a2 + rounder

  247.     psrad_i2r (ROW_SHIFT, mm1);         // mm1 = y1 y0

  248. 

  249.     paddd_r2r (mm6, mm5);               // mm5 = b3 b2

  250.     movq_r2r (mm0, mm7);                // mm7 = a3 a2 + rounder

  251. 

  252.     paddd_r2r (mm5, mm0);               // mm0 = a3+b3 a2+b2 + rounder

  253.     psubd_r2r (mm5, mm7);               // mm7 = a3-b3 a2-b2 + rounder

  254. }

  255. 

  256. static inline void mmx_row_tail (int16_t * row, int store)

  257. {

  258.     psrad_i2r (ROW_SHIFT, mm0);         // mm0 = y3 y2

  259. 

  260.     psrad_i2r (ROW_SHIFT, mm7);         // mm7 = y4 y5

  261. 

  262.     packssdw_r2r (mm0, mm1);            // mm1 = y3 y2 y1 y0

  263. 

  264.     packssdw_r2r (mm3, mm7);            // mm7 = y6 y7 y4 y5

  265. 

  266.     movq_r2m (mm1, *(row+store));       // save y3 y2 y1 y0

  267.     movq_r2r (mm7, mm4);                // mm4 = y6 y7 y4 y5

  268. 

  269.     pslld_i2r (16, mm7);                // mm7 = y7 0 y5 0

  270. 

  271.     psrld_i2r (16, mm4);                // mm4 = 0 y6 0 y4

  272. 

  273.     por_r2r (mm4, mm7);                 // mm7 = y7 y6 y5 y4

  274. 

  275.     /* slot */

  276. 

  277.     movq_r2m (mm7, *(row+store+4));     // save y7 y6 y5 y4

  278. }

  279. 

  280. static inline void mmx_row_mid (int16_t * row, int store,

  281.                                 int offset, const int16_t * table)

  282. {

  283.     movq_m2r (*(row+offset), mm2);      // mm2 = x6 x4 x2 x0

  284.     psrad_i2r (ROW_SHIFT, mm0);         // mm0 = y3 y2

  285. 

  286.     movq_m2r (*(row+offset+4), mm5);    // mm5 = x7 x5 x3 x1

  287.     psrad_i2r (ROW_SHIFT, mm7);         // mm7 = y4 y5

  288. 

  289.     packssdw_r2r (mm0, mm1);            // mm1 = y3 y2 y1 y0

  290.     movq_r2r (mm5, mm6);                // mm6 = x7 x5 x3 x1

  291. 

  292.     packssdw_r2r (mm3, mm7);            // mm7 = y6 y7 y4 y5

  293.     movq_r2r (mm2, mm0);                // mm0 = x6 x4 x2 x0

  294. 

  295.     movq_r2m (mm1, *(row+store));       // save y3 y2 y1 y0

  296.     movq_r2r (mm7, mm1);                // mm1 = y6 y7 y4 y5

  297. 

  298.     punpckldq_r2r (mm0, mm0);           // mm0 = x2 x0 x2 x0

  299.     psrld_i2r (16, mm7);                // mm7 = 0 y6 0 y4

  300. 

  301.     movq_m2r (*table, mm3);             // mm3 = C6 C4 C2 C4

  302.     pslld_i2r (16, mm1);                // mm1 = y7 0 y5 0

  303. 

  304.     movq_m2r (*(table+4), mm4);         // mm4 = -C2 -C4 C6 C4

  305.     por_r2r (mm1, mm7);                 // mm7 = y7 y6 y5 y4

  306. 

  307.     movq_m2r (*(table+8), mm1);         // mm1 = -C7 C3 C3 C1

  308.     punpckhdq_r2r (mm2, mm2);           // mm2 = x6 x4 x6 x4

  309. 

  310.     movq_r2m (mm7, *(row+store+4));     // save y7 y6 y5 y4

  311.     pmaddwd_r2r (mm0, mm3);             // mm3 = C4*x0+C6*x2 C4*x0+C2*x2

  312. }

  313. 

  314. 

  315. #if 0

  316. // C column IDCT - its just here to document the MMXEXT and MMX versions

  317. static inline void idct_col (int16_t * col, int offset)

  318. {

  319. /* multiplication - as implemented on mmx */

  320. #define F(c,x) (((c) * (x)) >> 16)

  321. 

  322. /* saturation - it helps us handle torture test cases */

  323. #define S(x) (((x)>32767) ? 32767 : ((x)<-32768) ? -32768 : (x))

  324. 

  325.     int16_t x0, x1, x2, x3, x4, x5, x6, x7;

  326.     int16_t y0, y1, y2, y3, y4, y5, y6, y7;

  327.     int16_t a0, a1, a2, a3, b0, b1, b2, b3;

  328.     int16_t u04, v04, u26, v26, u17, v17, u35, v35, u12, v12;

  329. 

  330.     col += offset;

  331. 

  332.     x0 = col[0*8];

  333.     x1 = col[1*8];

  334.     x2 = col[2*8];

  335.     x3 = col[3*8];

  336.     x4 = col[4*8];

  337.     x5 = col[5*8];

  338.     x6 = col[6*8];

  339.     x7 = col[7*8];

  340. 

  341.     u04 = S (x0 + x4);

  342.     v04 = S (x0 - x4);

  343.     u26 = S (F (T2, x6) + x2);

  344.     v26 = S (F (T2, x2) - x6);

  345. 

  346.     a0 = S (u04 + u26);

  347.     a1 = S (v04 + v26);

  348.     a2 = S (v04 - v26);

  349.     a3 = S (u04 - u26);

  350. 

  351.     u17 = S (F (T1, x7) + x1);

  352.     v17 = S (F (T1, x1) - x7);

  353.     u35 = S (F (T3, x5) + x3);

  354.     v35 = S (F (T3, x3) - x5);

  355. 

  356.     b0 = S (u17 + u35);

  357.     b3 = S (v17 - v35);

  358.     u12 = S (u17 - u35);

  359.     v12 = S (v17 + v35);

  360.     u12 = S (2 * F (C4, u12));

  361.     v12 = S (2 * F (C4, v12));

  362.     b1 = S (u12 + v12);

  363.     b2 = S (u12 - v12);

  364. 

  365.     y0 = S (a0 + b0) >> COL_SHIFT;

  366.     y1 = S (a1 + b1) >> COL_SHIFT;

  367.     y2 = S (a2 + b2) >> COL_SHIFT;

  368.     y3 = S (a3 + b3) >> COL_SHIFT;

  369. 

  370.     y4 = S (a3 - b3) >> COL_SHIFT;

  371.     y5 = S (a2 - b2) >> COL_SHIFT;

  372.     y6 = S (a1 - b1) >> COL_SHIFT;

  373.     y7 = S (a0 - b0) >> COL_SHIFT;

  374. 

  375.     col[0*8] = y0;

  376.     col[1*8] = y1;

  377.     col[2*8] = y2;

  378.     col[3*8] = y3;

  379.     col[4*8] = y4;

  380.     col[5*8] = y5;

  381.     col[6*8] = y6;

  382.     col[7*8] = y7;

  383. }

  384. #endif

  385. 

  386. 

  387. // MMX column IDCT

  388. static inline void idct_col (int16_t * col, int offset)

  389. {

  390. #define T1 13036

  391. #define T2 27146

  392. #define T3 43790

  393. #define C4 23170

  394. 

  395.     static const short _T1[] ATTR_ALIGN(8) = {T1,T1,T1,T1};

  396.     static const short _T2[] ATTR_ALIGN(8) = {T2,T2,T2,T2};

  397.     static const short _T3[] ATTR_ALIGN(8) = {T3,T3,T3,T3};

  398.     static const short _C4[] ATTR_ALIGN(8) = {C4,C4,C4,C4};

  399. 

  400.     /* column code adapted from peter gubanov */

  401.     /* http://www.elecard.com/peter/idct.shtml */

  402. 

  403.     movq_m2r (*_T1, mm0);               // mm0 = T1

  404. 

  405.     movq_m2r (*(col+offset+1*8), mm1);  // mm1 = x1

  406.     movq_r2r (mm0, mm2);                // mm2 = T1

  407. 

  408.     movq_m2r (*(col+offset+7*8), mm4);  // mm4 = x7

  409.     pmulhw_r2r (mm1, mm0);              // mm0 = T1*x1

  410. 

  411.     movq_m2r (*_T3, mm5);               // mm5 = T3

  412.     pmulhw_r2r (mm4, mm2);              // mm2 = T1*x7

  413. 

  414.     movq_m2r (*(col+offset+5*8), mm6);  // mm6 = x5

  415.     movq_r2r (mm5, mm7);                // mm7 = T3-1

  416. 

  417.     movq_m2r (*(col+offset+3*8), mm3);  // mm3 = x3

  418.     psubsw_r2r (mm4, mm0);              // mm0 = v17

  419. 

  420.     movq_m2r (*_T2, mm4);               // mm4 = T2

  421.     pmulhw_r2r (mm3, mm5);              // mm5 = (T3-1)*x3

  422. 

  423.     paddsw_r2r (mm2, mm1);              // mm1 = u17

  424.     pmulhw_r2r (mm6, mm7);              // mm7 = (T3-1)*x5

  425. 

  426.     /* slot */

  427. 

  428.     movq_r2r (mm4, mm2);                // mm2 = T2

  429.     paddsw_r2r (mm3, mm5);              // mm5 = T3*x3

  430. 

  431.     pmulhw_m2r (*(col+offset+2*8), mm4);// mm4 = T2*x2

  432.     paddsw_r2r (mm6, mm7);              // mm7 = T3*x5

  433. 

  434.     psubsw_r2r (mm6, mm5);              // mm5 = v35

  435.     paddsw_r2r (mm3, mm7);              // mm7 = u35

  436. 

  437.     movq_m2r (*(col+offset+6*8), mm3);  // mm3 = x6

  438.     movq_r2r (mm0, mm6);                // mm6 = v17

  439. 

  440.     pmulhw_r2r (mm3, mm2);              // mm2 = T2*x6

  441.     psubsw_r2r (mm5, mm0);              // mm0 = b3

  442. 

  443.     psubsw_r2r (mm3, mm4);              // mm4 = v26

  444.     paddsw_r2r (mm6, mm5);              // mm5 = v12

  445. 

  446.     movq_r2m (mm0, *(col+offset+3*8));  // save b3 in scratch0

  447.     movq_r2r (mm1, mm6);                // mm6 = u17

  448. 

  449.     paddsw_m2r (*(col+offset+2*8), mm2);// mm2 = u26

  450.     paddsw_r2r (mm7, mm6);              // mm6 = b0

  451. 

  452.     psubsw_r2r (mm7, mm1);              // mm1 = u12

  453.     movq_r2r (mm1, mm7);                // mm7 = u12

  454. 

  455.     movq_m2r (*(col+offset+0*8), mm3);  // mm3 = x0

  456.     paddsw_r2r (mm5, mm1);              // mm1 = u12+v12

  457. 

  458.     movq_m2r (*_C4, mm0);               // mm0 = C4/2

  459.     psubsw_r2r (mm5, mm7);              // mm7 = u12-v12

  460. 

  461.     movq_r2m (mm6, *(col+offset+5*8));  // save b0 in scratch1

  462.     pmulhw_r2r (mm0, mm1);              // mm1 = b1/2

  463. 

  464.     movq_r2r (mm4, mm6);                // mm6 = v26

  465.     pmulhw_r2r (mm0, mm7);              // mm7 = b2/2

  466. 

  467.     movq_m2r (*(col+offset+4*8), mm5);  // mm5 = x4

  468.     movq_r2r (mm3, mm0);                // mm0 = x0

  469. 

  470.     psubsw_r2r (mm5, mm3);              // mm3 = v04

  471.     paddsw_r2r (mm5, mm0);              // mm0 = u04

  472. 

  473.     paddsw_r2r (mm3, mm4);              // mm4 = a1

  474.     movq_r2r (mm0, mm5);                // mm5 = u04

  475. 

  476.     psubsw_r2r (mm6, mm3);              // mm3 = a2

  477.     paddsw_r2r (mm2, mm5);              // mm5 = a0

  478. 

  479.     paddsw_r2r (mm1, mm1);              // mm1 = b1

  480.     psubsw_r2r (mm2, mm0);              // mm0 = a3

  481. 

  482.     paddsw_r2r (mm7, mm7);              // mm7 = b2

  483.     movq_r2r (mm3, mm2);                // mm2 = a2

  484. 

  485.     movq_r2r (mm4, mm6);                // mm6 = a1

  486.     paddsw_r2r (mm7, mm3);              // mm3 = a2+b2

  487. 

  488.     psraw_i2r (COL_SHIFT, mm3);         // mm3 = y2

  489.     paddsw_r2r (mm1, mm4);              // mm4 = a1+b1

  490. 

  491.     psraw_i2r (COL_SHIFT, mm4);         // mm4 = y1

  492.     psubsw_r2r (mm1, mm6);              // mm6 = a1-b1

  493. 

  494.     movq_m2r (*(col+offset+5*8), mm1);  // mm1 = b0

  495.     psubsw_r2r (mm7, mm2);              // mm2 = a2-b2

  496. 

  497.     psraw_i2r (COL_SHIFT, mm6);         // mm6 = y6

  498.     movq_r2r (mm5, mm7);                // mm7 = a0

  499. 

  500.     movq_r2m (mm4, *(col+offset+1*8));  // save y1

  501.     psraw_i2r (COL_SHIFT, mm2);         // mm2 = y5

  502. 

  503.     movq_r2m (mm3, *(col+offset+2*8));  // save y2

  504.     paddsw_r2r (mm1, mm5);              // mm5 = a0+b0

  505. 

  506.     movq_m2r (*(col+offset+3*8), mm4);  // mm4 = b3

  507.     psubsw_r2r (mm1, mm7);              // mm7 = a0-b0

  508. 

  509.     psraw_i2r (COL_SHIFT, mm5);         // mm5 = y0

  510.     movq_r2r (mm0, mm3);                // mm3 = a3

  511. 

  512.     movq_r2m (mm2, *(col+offset+5*8));  // save y5

  513.     psubsw_r2r (mm4, mm3);              // mm3 = a3-b3

  514. 

  515.     psraw_i2r (COL_SHIFT, mm7);         // mm7 = y7

  516.     paddsw_r2r (mm0, mm4);              // mm4 = a3+b3

  517. 

  518.     movq_r2m (mm5, *(col+offset+0*8));  // save y0

  519.     psraw_i2r (COL_SHIFT, mm3);         // mm3 = y4

  520. 

  521.     movq_r2m (mm6, *(col+offset+6*8));  // save y6

  522.     psraw_i2r (COL_SHIFT, mm4);         // mm4 = y3

  523. 

  524.     movq_r2m (mm7, *(col+offset+7*8));  // save y7

  525. 

  526.     movq_r2m (mm3, *(col+offset+4*8));  // save y4

  527. 

  528.     movq_r2m (mm4, *(col+offset+3*8));  // save y3

  529. 

  530. #undef T1

  531. #undef T2

  532. #undef T3

  533. #undef C4

  534. }

  535. 

  536. static const int32_t rounder0[] ATTR_ALIGN(8) =

  537.     rounder ((1 << (COL_SHIFT - 1)) - 0.5);

  538. static const int32_t rounder4[] ATTR_ALIGN(8) = rounder (0);

  539. static const int32_t rounder1[] ATTR_ALIGN(8) =

  540.     rounder (1.25683487303);        /* C1*(C1/C4+C1+C7)/2 */

  541. static const int32_t rounder7[] ATTR_ALIGN(8) =

  542.     rounder (-0.25);                /* C1*(C7/C4+C7-C1)/2 */

  543. static const int32_t rounder2[] ATTR_ALIGN(8) =

  544.     rounder (0.60355339059);        /* C2 * (C6+C2)/2 */

  545. static const int32_t rounder6[] ATTR_ALIGN(8) =

  546.     rounder (-0.25);                /* C2 * (C6-C2)/2 */

  547. static const int32_t rounder3[] ATTR_ALIGN(8) =

  548.     rounder (0.087788325588);       /* C3*(-C3/C4+C3+C5)/2 */

  549. static const int32_t rounder5[] ATTR_ALIGN(8) =

  550.     rounder (-0.441341716183);      /* C3*(-C5/C4+C5-C3)/2 */

  551. 

  552. #undef COL_SHIFT

  553. #undef ROW_SHIFT

  554. 

  555. #define declare_idct(idct,table,idct_row_head,idct_row,idct_row_tail,idct_row_mid) \

  556. void idct (int16_t * block)                                             \

  557. {                                                                       \

  558.     static const int16_t table04[] ATTR_ALIGN(16) =                     \

  559.         table (22725, 21407, 19266, 16384, 12873,  8867, 4520);         \

  560.     static const int16_t table17[] ATTR_ALIGN(16) =                     \

  561.         table (31521, 29692, 26722, 22725, 17855, 12299, 6270);         \

  562.     static const int16_t table26[] ATTR_ALIGN(16) =                     \

  563.         table (29692, 27969, 25172, 21407, 16819, 11585, 5906);         \

  564.     static const int16_t table35[] ATTR_ALIGN(16) =                     \

  565.         table (26722, 25172, 22654, 19266, 15137, 10426, 5315);         \

  566.                                                                         \

  567.     idct_row_head (block, 0*8, table04);                                \

  568.     idct_row (table04, rounder0);                                       \

  569.     idct_row_mid (block, 0*8, 4*8, table04);                            \

  570.     idct_row (table04, rounder4);                                       \

  571.     idct_row_mid (block, 4*8, 1*8, table17);                            \

  572.     idct_row (table17, rounder1);                                       \

  573.     idct_row_mid (block, 1*8, 7*8, table17);                            \

  574.     idct_row (table17, rounder7);                                       \

  575.     idct_row_mid (block, 7*8, 2*8, table26);                            \

  576.     idct_row (table26, rounder2);                                       \

  577.     idct_row_mid (block, 2*8, 6*8, table26);                            \

  578.     idct_row (table26, rounder6);                                       \

  579.     idct_row_mid (block, 6*8, 3*8, table35);                            \

  580.     idct_row (table35, rounder3);                                       \

  581.     idct_row_mid (block, 3*8, 5*8, table35);                            \

  582.     idct_row (table35, rounder5);                                       \

  583.     idct_row_tail (block, 5*8);                                         \

  584.                                                                         \

  585.     idct_col (block, 0);                                                \

  586.     idct_col (block, 4);                                                \

  587. }

  588. 

  589. void ff_mmx_idct(DCTELEM *block);

  590. void ff_mmxext_idct(DCTELEM *block);

  591. 

  592. declare_idct (ff_mmxext_idct, mmxext_table,

  593.               mmxext_row_head, mmxext_row, mmxext_row_tail, mmxext_row_mid)

  594. 

  595. declare_idct (ff_mmx_idct, mmx_table,

  596.               mmx_row_head, mmx_row, mmx_row_tail, mmx_row_mid)