quicktime/ffmpeg/libavcodec/i386/idct_mmx.c

   1 /*
   2  * Note: For libavcodec, this code can also be used under the LGPL license
   3  */
   4 /*
   5  * idct_mmx.c
   6  * Copyright (C) 1999-2001 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
   7  *
   8  * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
   9  *
  10  * mpeg2dec is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * mpeg2dec is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include "../common.h"
  26 #include "../dsputil.h"
  27
  28 #include "mmx.h"
  29
  30 #define ATTR_ALIGN(align) __attribute__ ((__aligned__ (align)))
  31
  32 #define ROW_SHIFT 11
  33 #define COL_SHIFT 6
  34
  35 #define round(bias) ((int)(((bias)+0.5) * (1<<ROW_SHIFT)))
  36 #define rounder(bias) {round (bias), round (bias)}
  37
  38 #if 0
  39 /* C row IDCT - its just here to document the MMXEXT and MMX versions */
  40 static inline void idct_row (int16_t * row, int offset,
  41                              int16_t * table, int32_t * rounder)
  42 {
  43     int C1, C2, C3, C4, C5, C6, C7;
  44     int a0, a1, a2, a3, b0, b1, b2, b3;
  45
  46     row += offset;
  47
  48     C1 = table[1];
  49     C2 = table[2];
  50     C3 = table[3];
  51     C4 = table[4];
  52     C5 = table[5];
  53     C6 = table[6];
  54     C7 = table[7];
  55
  56     a0 = C4*row[0] + C2*row[2] + C4*row[4] + C6*row[6] + *rounder;
  57     a1 = C4*row[0] + C6*row[2] - C4*row[4] - C2*row[6] + *rounder;
  58     a2 = C4*row[0] - C6*row[2] - C4*row[4] + C2*row[6] + *rounder;
  59     a3 = C4*row[0] - C2*row[2] + C4*row[4] - C6*row[6] + *rounder;
  60
  61     b0 = C1*row[1] + C3*row[3] + C5*row[5] + C7*row[7];
  62     b1 = C3*row[1] - C7*row[3] - C1*row[5] - C5*row[7];
  63     b2 = C5*row[1] - C1*row[3] + C7*row[5] + C3*row[7];
  64     b3 = C7*row[1] - C5*row[3] + C3*row[5] - C1*row[7];
  65
  66     row[0] = (a0 + b0) >> ROW_SHIFT;
  67     row[1] = (a1 + b1) >> ROW_SHIFT;
  68     row[2] = (a2 + b2) >> ROW_SHIFT;
  69     row[3] = (a3 + b3) >> ROW_SHIFT;
  70     row[4] = (a3 - b3) >> ROW_SHIFT;
  71     row[5] = (a2 - b2) >> ROW_SHIFT;
  72     row[6] = (a1 - b1) >> ROW_SHIFT;
  73     row[7] = (a0 - b0) >> ROW_SHIFT;
  74 }
  75 #endif
  76
  77
  78 /* MMXEXT row IDCT */
  79
  80 #define mmxext_table(c1,c2,c3,c4,c5,c6,c7)      {  c4,  c2, -c4, -c2,   \
  81                                                    c4,  c6,  c4,  c6,   \
  82                                                    c1,  c3, -c1, -c5,   \
  83                                                    c5,  c7,  c3, -c7,   \
  84                                                    c4, -c6,  c4, -c6,   \
  85                                                   -c4,  c2,  c4, -c2,   \
  86                                                    c5, -c1,  c3, -c1,   \
  87                                                    c7,  c3,  c7, -c5 }
  88
  89 static inline void mmxext_row_head (int16_t * row, int offset, int16_t * table)
  90 {
  91     movq_m2r (*(row+offset), mm2);      // mm2 = x6 x4 x2 x0
  92
  93     movq_m2r (*(row+offset+4), mm5);    // mm5 = x7 x5 x3 x1
  94     movq_r2r (mm2, mm0);                // mm0 = x6 x4 x2 x0
  95
  96     movq_m2r (*table, mm3);             // mm3 = -C2 -C4 C2 C4
  97     movq_r2r (mm5, mm6);                // mm6 = x7 x5 x3 x1
  98
  99     movq_m2r (*(table+4), mm4);         // mm4 = C6 C4 C6 C4
 100     pmaddwd_r2r (mm0, mm3);             // mm3 = -C4*x4-C2*x6 C4*x0+C2*x2
 101
 102     pshufw_r2r (mm2, mm2, 0x4e);        // mm2 = x2 x0 x6 x4
 103 }
 104
 105 static inline void mmxext_row (int16_t * table, int32_t * rounder)
 106 {
 107     movq_m2r (*(table+8), mm1);         // mm1 = -C5 -C1 C3 C1
 108     pmaddwd_r2r (mm2, mm4);             // mm4 = C4*x0+C6*x2 C4*x4+C6*x6
 109
 110     pmaddwd_m2r (*(table+16), mm0);     // mm0 = C4*x4-C6*x6 C4*x0-C6*x2
 111     pshufw_r2r (mm6, mm6, 0x4e);        // mm6 = x3 x1 x7 x5
 112
 113     movq_m2r (*(table+12), mm7);        // mm7 = -C7 C3 C7 C5
 114     pmaddwd_r2r (mm5, mm1);             // mm1 = -C1*x5-C5*x7 C1*x1+C3*x3
 115
 116     paddd_m2r (*rounder, mm3);          // mm3 += rounder
 117     pmaddwd_r2r (mm6, mm7);             // mm7 = C3*x1-C7*x3 C5*x5+C7*x7
 118
 119     pmaddwd_m2r (*(table+20), mm2);     // mm2 = C4*x0-C2*x2 -C4*x4+C2*x6
 120     paddd_r2r (mm4, mm3);               // mm3 = a1 a0 + rounder
 121
 122     pmaddwd_m2r (*(table+24), mm5);     // mm5 = C3*x5-C1*x7 C5*x1-C1*x3
 123     movq_r2r (mm3, mm4);                // mm4 = a1 a0 + rounder
 124
 125     pmaddwd_m2r (*(table+28), mm6);     // mm6 = C7*x1-C5*x3 C7*x5+C3*x7
 126     paddd_r2r (mm7, mm1);               // mm1 = b1 b0
 127
 128     paddd_m2r (*rounder, mm0);          // mm0 += rounder
 129     psubd_r2r (mm1, mm3);               // mm3 = a1-b1 a0-b0 + rounder
 130
 131     psrad_i2r (ROW_SHIFT, mm3);         // mm3 = y6 y7
 132     paddd_r2r (mm4, mm1);               // mm1 = a1+b1 a0+b0 + rounder
 133
 134     paddd_r2r (mm2, mm0);               // mm0 = a3 a2 + rounder
 135     psrad_i2r (ROW_SHIFT, mm1);         // mm1 = y1 y0
 136
 137     paddd_r2r (mm6, mm5);               // mm5 = b3 b2
 138     movq_r2r (mm0, mm4);                // mm4 = a3 a2 + rounder
 139
 140     paddd_r2r (mm5, mm0);               // mm0 = a3+b3 a2+b2 + rounder
 141     psubd_r2r (mm5, mm4);               // mm4 = a3-b3 a2-b2 + rounder
 142 }
 143
 144 static inline void mmxext_row_tail (int16_t * row, int store)
 145 {
 146     psrad_i2r (ROW_SHIFT, mm0);         // mm0 = y3 y2
 147
 148     psrad_i2r (ROW_SHIFT, mm4);         // mm4 = y4 y5
 149
 150     packssdw_r2r (mm0, mm1);            // mm1 = y3 y2 y1 y0
 151
 152     packssdw_r2r (mm3, mm4);            // mm4 = y6 y7 y4 y5
 153
 154     movq_r2m (mm1, *(row+store));       // save y3 y2 y1 y0
 155     pshufw_r2r (mm4, mm4, 0xb1);        // mm4 = y7 y6 y5 y4
 156
 157     /* slot */
 158
 159     movq_r2m (mm4, *(row+store+4));     // save y7 y6 y5 y4
 160 }
 161
 162 static inline void mmxext_row_mid (int16_t * row, int store,
 163                                    int offset, int16_t * table)
 164 {
 165     movq_m2r (*(row+offset), mm2);      // mm2 = x6 x4 x2 x0
 166     psrad_i2r (ROW_SHIFT, mm0);         // mm0 = y3 y2
 167
 168     movq_m2r (*(row+offset+4), mm5);    // mm5 = x7 x5 x3 x1
 169     psrad_i2r (ROW_SHIFT, mm4);         // mm4 = y4 y5
 170
 171     packssdw_r2r (mm0, mm1);            // mm1 = y3 y2 y1 y0
 172     movq_r2r (mm5, mm6);                // mm6 = x7 x5 x3 x1
 173
 174     packssdw_r2r (mm3, mm4);            // mm4 = y6 y7 y4 y5
 175     movq_r2r (mm2, mm0);                // mm0 = x6 x4 x2 x0
 176
 177     movq_r2m (mm1, *(row+store));       // save y3 y2 y1 y0
 178     pshufw_r2r (mm4, mm4, 0xb1);        // mm4 = y7 y6 y5 y4
 179
 180     movq_m2r (*table, mm3);             // mm3 = -C2 -C4 C2 C4
 181     movq_r2m (mm4, *(row+store+4));     // save y7 y6 y5 y4
 182
 183     pmaddwd_r2r (mm0, mm3);             // mm3 = -C4*x4-C2*x6 C4*x0+C2*x2
 184
 185     movq_m2r (*(table+4), mm4);         // mm4 = C6 C4 C6 C4
 186     pshufw_r2r (mm2, mm2, 0x4e);        // mm2 = x2 x0 x6 x4
 187 }
 188
 189
 190 /* MMX row IDCT */
 191
 192 #define mmx_table(c1,c2,c3,c4,c5,c6,c7) {  c4,  c2,  c4,  c6,   \
 193                                            c4,  c6, -c4, -c2,   \
 194                                            c1,  c3,  c3, -c7,   \
 195                                            c5,  c7, -c1, -c5,   \
 196                                            c4, -c6,  c4, -c2,   \
 197                                           -c4,  c2,  c4, -c6,   \
 198                                            c5, -c1,  c7, -c5,   \
 199                                            c7,  c3,  c3, -c1 }
 200
 201 static inline void mmx_row_head (int16_t * row, int offset, int16_t * table)
 202 {
 203     movq_m2r (*(row+offset), mm2);      // mm2 = x6 x4 x2 x0
 204
 205     movq_m2r (*(row+offset+4), mm5);    // mm5 = x7 x5 x3 x1
 206     movq_r2r (mm2, mm0);                // mm0 = x6 x4 x2 x0
 207
 208     movq_m2r (*table, mm3);             // mm3 = C6 C4 C2 C4
 209     movq_r2r (mm5, mm6);                // mm6 = x7 x5 x3 x1
 210
 211     punpckldq_r2r (mm0, mm0);           // mm0 = x2 x0 x2 x0
 212
 213     movq_m2r (*(table+4), mm4);         // mm4 = -C2 -C4 C6 C4
 214     pmaddwd_r2r (mm0, mm3);             // mm3 = C4*x0+C6*x2 C4*x0+C2*x2
 215
 216     movq_m2r (*(table+8), mm1);         // mm1 = -C7 C3 C3 C1
 217     punpckhdq_r2r (mm2, mm2);           // mm2 = x6 x4 x6 x4
 218 }
 219
 220 static inline void mmx_row (int16_t * table, int32_t * rounder)
 221 {
 222     pmaddwd_r2r (mm2, mm4);             // mm4 = -C4*x4-C2*x6 C4*x4+C6*x6
 223     punpckldq_r2r (mm5, mm5);           // mm5 = x3 x1 x3 x1
 224
 225     pmaddwd_m2r (*(table+16), mm0);     // mm0 = C4*x0-C2*x2 C4*x0-C6*x2
 226     punpckhdq_r2r (mm6, mm6);           // mm6 = x7 x5 x7 x5
 227
 228     movq_m2r (*(table+12), mm7);        // mm7 = -C5 -C1 C7 C5
 229     pmaddwd_r2r (mm5, mm1);             // mm1 = C3*x1-C7*x3 C1*x1+C3*x3
 230
 231     paddd_m2r (*rounder, mm3);          // mm3 += rounder
 232     pmaddwd_r2r (mm6, mm7);             // mm7 = -C1*x5-C5*x7 C5*x5+C7*x7
 233
 234     pmaddwd_m2r (*(table+20), mm2);     // mm2 = C4*x4-C6*x6 -C4*x4+C2*x6
 235     paddd_r2r (mm4, mm3);               // mm3 = a1 a0 + rounder
 236
 237     pmaddwd_m2r (*(table+24), mm5);     // mm5 = C7*x1-C5*x3 C5*x1-C1*x3
 238     movq_r2r (mm3, mm4);                // mm4 = a1 a0 + rounder
 239
 240     pmaddwd_m2r (*(table+28), mm6);     // mm6 = C3*x5-C1*x7 C7*x5+C3*x7
 241     paddd_r2r (mm7, mm1);               // mm1 = b1 b0
 242
 243     paddd_m2r (*rounder, mm0);          // mm0 += rounder
 244     psubd_r2r (mm1, mm3);               // mm3 = a1-b1 a0-b0 + rounder
 245
 246     psrad_i2r (ROW_SHIFT, mm3);         // mm3 = y6 y7
 247     paddd_r2r (mm4, mm1);               // mm1 = a1+b1 a0+b0 + rounder
 248
 249     paddd_r2r (mm2, mm0);               // mm0 = a3 a2 + rounder
 250     psrad_i2r (ROW_SHIFT, mm1);         // mm1 = y1 y0
 251
 252     paddd_r2r (mm6, mm5);               // mm5 = b3 b2
 253     movq_r2r (mm0, mm7);                // mm7 = a3 a2 + rounder
 254
 255     paddd_r2r (mm5, mm0);               // mm0 = a3+b3 a2+b2 + rounder
 256     psubd_r2r (mm5, mm7);               // mm7 = a3-b3 a2-b2 + rounder
 257 }
 258
 259 static inline void mmx_row_tail (int16_t * row, int store)
 260 {
 261     psrad_i2r (ROW_SHIFT, mm0);         // mm0 = y3 y2
 262
 263     psrad_i2r (ROW_SHIFT, mm7);         // mm7 = y4 y5
 264
 265     packssdw_r2r (mm0, mm1);            // mm1 = y3 y2 y1 y0
 266
 267     packssdw_r2r (mm3, mm7);            // mm7 = y6 y7 y4 y5
 268
 269     movq_r2m (mm1, *(row+store));       // save y3 y2 y1 y0
 270     movq_r2r (mm7, mm4);                // mm4 = y6 y7 y4 y5
 271
 272     pslld_i2r (16, mm7);                // mm7 = y7 0 y5 0
 273
 274     psrld_i2r (16, mm4);                // mm4 = 0 y6 0 y4
 275
 276     por_r2r (mm4, mm7);                 // mm7 = y7 y6 y5 y4
 277
 278     /* slot */
 279
 280     movq_r2m (mm7, *(row+store+4));     // save y7 y6 y5 y4
 281 }
 282
 283 static inline void mmx_row_mid (int16_t * row, int store,
 284                                 int offset, int16_t * table)
 285 {
 286     movq_m2r (*(row+offset), mm2);      // mm2 = x6 x4 x2 x0
 287     psrad_i2r (ROW_SHIFT, mm0);         // mm0 = y3 y2
 288
 289     movq_m2r (*(row+offset+4), mm5);    // mm5 = x7 x5 x3 x1
 290     psrad_i2r (ROW_SHIFT, mm7);         // mm7 = y4 y5
 291
 292     packssdw_r2r (mm0, mm1);            // mm1 = y3 y2 y1 y0
 293     movq_r2r (mm5, mm6);                // mm6 = x7 x5 x3 x1
 294
 295     packssdw_r2r (mm3, mm7);            // mm7 = y6 y7 y4 y5
 296     movq_r2r (mm2, mm0);                // mm0 = x6 x4 x2 x0
 297
 298     movq_r2m (mm1, *(row+store));       // save y3 y2 y1 y0
 299     movq_r2r (mm7, mm1);                // mm1 = y6 y7 y4 y5
 300
 301     punpckldq_r2r (mm0, mm0);           // mm0 = x2 x0 x2 x0
 302     psrld_i2r (16, mm7);                // mm7 = 0 y6 0 y4
 303
 304     movq_m2r (*table, mm3);             // mm3 = C6 C4 C2 C4
 305     pslld_i2r (16, mm1);                // mm1 = y7 0 y5 0
 306
 307     movq_m2r (*(table+4), mm4);         // mm4 = -C2 -C4 C6 C4
 308     por_r2r (mm1, mm7);                 // mm7 = y7 y6 y5 y4
 309
 310     movq_m2r (*(table+8), mm1);         // mm1 = -C7 C3 C3 C1
 311     punpckhdq_r2r (mm2, mm2);           // mm2 = x6 x4 x6 x4
 312
 313     movq_r2m (mm7, *(row+store+4));     // save y7 y6 y5 y4
 314     pmaddwd_r2r (mm0, mm3);             // mm3 = C4*x0+C6*x2 C4*x0+C2*x2
 315 }
 316
 317
 318 #if 0
 319 // C column IDCT - its just here to document the MMXEXT and MMX versions
 320 static inline void idct_col (int16_t * col, int offset)
 321 {
 322 /* multiplication - as implemented on mmx */
 323 #define F(c,x) (((c) * (x)) >> 16)
 324
 325 /* saturation - it helps us handle torture test cases */
 326 #define S(x) (((x)>32767) ? 32767 : ((x)<-32768) ? -32768 : (x))
 327
 328     int16_t x0, x1, x2, x3, x4, x5, x6, x7;
 329     int16_t y0, y1, y2, y3, y4, y5, y6, y7;
 330     int16_t a0, a1, a2, a3, b0, b1, b2, b3;
 331     int16_t u04, v04, u26, v26, u17, v17, u35, v35, u12, v12;
 332
 333     col += offset;
 334
 335     x0 = col[0*8];
 336     x1 = col[1*8];
 337     x2 = col[2*8];
 338     x3 = col[3*8];
 339     x4 = col[4*8];
 340     x5 = col[5*8];
 341     x6 = col[6*8];
 342     x7 = col[7*8];
 343
 344     u04 = S (x0 + x4);
 345     v04 = S (x0 - x4);
 346     u26 = S (F (T2, x6) + x2);
 347     v26 = S (F (T2, x2) - x6);
 348
 349     a0 = S (u04 + u26);
 350     a1 = S (v04 + v26);
 351     a2 = S (v04 - v26);
 352     a3 = S (u04 - u26);
 353
 354     u17 = S (F (T1, x7) + x1);
 355     v17 = S (F (T1, x1) - x7);
 356     u35 = S (F (T3, x5) + x3);
 357     v35 = S (F (T3, x3) - x5);
 358
 359     b0 = S (u17 + u35);
 360     b3 = S (v17 - v35);
 361     u12 = S (u17 - u35);
 362     v12 = S (v17 + v35);
 363     u12 = S (2 * F (C4, u12));
 364     v12 = S (2 * F (C4, v12));
 365     b1 = S (u12 + v12);
 366     b2 = S (u12 - v12);
 367
 368     y0 = S (a0 + b0) >> COL_SHIFT;
 369     y1 = S (a1 + b1) >> COL_SHIFT;
 370     y2 = S (a2 + b2) >> COL_SHIFT;
 371     y3 = S (a3 + b3) >> COL_SHIFT;
 372
 373     y4 = S (a3 - b3) >> COL_SHIFT;
 374     y5 = S (a2 - b2) >> COL_SHIFT;
 375     y6 = S (a1 - b1) >> COL_SHIFT;
 376     y7 = S (a0 - b0) >> COL_SHIFT;
 377
 378     col[0*8] = y0;
 379     col[1*8] = y1;
 380     col[2*8] = y2;
 381     col[3*8] = y3;
 382     col[4*8] = y4;
 383     col[5*8] = y5;
 384     col[6*8] = y6;
 385     col[7*8] = y7;
 386 }
 387 #endif
 388
 389
 390 // MMX column IDCT
 391 static inline void idct_col (int16_t * col, int offset)
 392 {
 393 #define T1 13036
 394 #define T2 27146
 395 #define T3 43790
 396 #define C4 23170
 397
 398     static short _T1[] ATTR_ALIGN(8) = {T1,T1,T1,T1};
 399     static short _T2[] ATTR_ALIGN(8) = {T2,T2,T2,T2};
 400     static short _T3[] ATTR_ALIGN(8) = {T3,T3,T3,T3};
 401     static short _C4[] ATTR_ALIGN(8) = {C4,C4,C4,C4};
 402
 403     /* column code adapted from peter gubanov */
 404     /* http://www.elecard.com/peter/idct.shtml */
 405
 406     movq_m2r (*_T1, mm0);               // mm0 = T1
 407
 408     movq_m2r (*(col+offset+1*8), mm1);  // mm1 = x1
 409     movq_r2r (mm0, mm2);                // mm2 = T1
 410
 411     movq_m2r (*(col+offset+7*8), mm4);  // mm4 = x7
 412     pmulhw_r2r (mm1, mm0);              // mm0 = T1*x1
 413
 414     movq_m2r (*_T3, mm5);               // mm5 = T3
 415     pmulhw_r2r (mm4, mm2);              // mm2 = T1*x7
 416
 417     movq_m2r (*(col+offset+5*8), mm6);  // mm6 = x5
 418     movq_r2r (mm5, mm7);                // mm7 = T3-1
 419
 420     movq_m2r (*(col+offset+3*8), mm3);  // mm3 = x3
 421     psubsw_r2r (mm4, mm0);              // mm0 = v17
 422
 423     movq_m2r (*_T2, mm4);               // mm4 = T2
 424     pmulhw_r2r (mm3, mm5);              // mm5 = (T3-1)*x3
 425
 426     paddsw_r2r (mm2, mm1);              // mm1 = u17
 427     pmulhw_r2r (mm6, mm7);              // mm7 = (T3-1)*x5
 428
 429     /* slot */
 430
 431     movq_r2r (mm4, mm2);                // mm2 = T2
 432     paddsw_r2r (mm3, mm5);              // mm5 = T3*x3
 433
 434     pmulhw_m2r (*(col+offset+2*8), mm4);// mm4 = T2*x2
 435     paddsw_r2r (mm6, mm7);              // mm7 = T3*x5
 436
 437     psubsw_r2r (mm6, mm5);              // mm5 = v35
 438     paddsw_r2r (mm3, mm7);              // mm7 = u35
 439
 440     movq_m2r (*(col+offset+6*8), mm3);  // mm3 = x6
 441     movq_r2r (mm0, mm6);                // mm6 = v17
 442
 443     pmulhw_r2r (mm3, mm2);              // mm2 = T2*x6
 444     psubsw_r2r (mm5, mm0);              // mm0 = b3
 445
 446     psubsw_r2r (mm3, mm4);              // mm4 = v26
 447     paddsw_r2r (mm6, mm5);              // mm5 = v12
 448
 449     movq_r2m (mm0, *(col+offset+3*8));  // save b3 in scratch0
 450     movq_r2r (mm1, mm6);                // mm6 = u17
 451
 452     paddsw_m2r (*(col+offset+2*8), mm2);// mm2 = u26
 453     paddsw_r2r (mm7, mm6);              // mm6 = b0
 454
 455     psubsw_r2r (mm7, mm1);              // mm1 = u12
 456     movq_r2r (mm1, mm7);                // mm7 = u12
 457
 458     movq_m2r (*(col+offset+0*8), mm3);  // mm3 = x0
 459     paddsw_r2r (mm5, mm1);              // mm1 = u12+v12
 460
 461     movq_m2r (*_C4, mm0);               // mm0 = C4/2
 462     psubsw_r2r (mm5, mm7);              // mm7 = u12-v12
 463
 464     movq_r2m (mm6, *(col+offset+5*8));  // save b0 in scratch1
 465     pmulhw_r2r (mm0, mm1);              // mm1 = b1/2
 466
 467     movq_r2r (mm4, mm6);                // mm6 = v26
 468     pmulhw_r2r (mm0, mm7);              // mm7 = b2/2
 469
 470     movq_m2r (*(col+offset+4*8), mm5);  // mm5 = x4
 471     movq_r2r (mm3, mm0);                // mm0 = x0
 472
 473     psubsw_r2r (mm5, mm3);              // mm3 = v04
 474     paddsw_r2r (mm5, mm0);              // mm0 = u04
 475
 476     paddsw_r2r (mm3, mm4);              // mm4 = a1
 477     movq_r2r (mm0, mm5);                // mm5 = u04
 478
 479     psubsw_r2r (mm6, mm3);              // mm3 = a2
 480     paddsw_r2r (mm2, mm5);              // mm5 = a0
 481
 482     paddsw_r2r (mm1, mm1);              // mm1 = b1
 483     psubsw_r2r (mm2, mm0);              // mm0 = a3
 484
 485     paddsw_r2r (mm7, mm7);              // mm7 = b2
 486     movq_r2r (mm3, mm2);                // mm2 = a2
 487
 488     movq_r2r (mm4, mm6);                // mm6 = a1
 489     paddsw_r2r (mm7, mm3);              // mm3 = a2+b2
 490
 491     psraw_i2r (COL_SHIFT, mm3);         // mm3 = y2
 492     paddsw_r2r (mm1, mm4);              // mm4 = a1+b1
 493
 494     psraw_i2r (COL_SHIFT, mm4);         // mm4 = y1
 495     psubsw_r2r (mm1, mm6);              // mm6 = a1-b1
 496
 497     movq_m2r (*(col+offset+5*8), mm1);  // mm1 = b0
 498     psubsw_r2r (mm7, mm2);              // mm2 = a2-b2
 499
 500     psraw_i2r (COL_SHIFT, mm6);         // mm6 = y6
 501     movq_r2r (mm5, mm7);                // mm7 = a0
 502
 503     movq_r2m (mm4, *(col+offset+1*8));  // save y1
 504     psraw_i2r (COL_SHIFT, mm2);         // mm2 = y5
 505
 506     movq_r2m (mm3, *(col+offset+2*8));  // save y2
 507     paddsw_r2r (mm1, mm5);              // mm5 = a0+b0
 508
 509     movq_m2r (*(col+offset+3*8), mm4);  // mm4 = b3
 510     psubsw_r2r (mm1, mm7);              // mm7 = a0-b0
 511
 512     psraw_i2r (COL_SHIFT, mm5);         // mm5 = y0
 513     movq_r2r (mm0, mm3);                // mm3 = a3
 514
 515     movq_r2m (mm2, *(col+offset+5*8));  // save y5
 516     psubsw_r2r (mm4, mm3);              // mm3 = a3-b3
 517
 518     psraw_i2r (COL_SHIFT, mm7);         // mm7 = y7
 519     paddsw_r2r (mm0, mm4);              // mm4 = a3+b3
 520
 521     movq_r2m (mm5, *(col+offset+0*8));  // save y0
 522     psraw_i2r (COL_SHIFT, mm3);         // mm3 = y4
 523
 524     movq_r2m (mm6, *(col+offset+6*8));  // save y6
 525     psraw_i2r (COL_SHIFT, mm4);         // mm4 = y3
 526
 527     movq_r2m (mm7, *(col+offset+7*8));  // save y7
 528
 529     movq_r2m (mm3, *(col+offset+4*8));  // save y4
 530
 531     movq_r2m (mm4, *(col+offset+3*8));  // save y3
 532
 533 #undef T1
 534 #undef T2
 535 #undef T3
 536 #undef C4
 537 }
 538
 539 static int32_t rounder0[] ATTR_ALIGN(8) =
 540     rounder ((1 << (COL_SHIFT - 1)) - 0.5);
 541 static int32_t rounder4[] ATTR_ALIGN(8) = rounder (0);
 542 static int32_t rounder1[] ATTR_ALIGN(8) =
 543     rounder (1.25683487303);    /* C1*(C1/C4+C1+C7)/2 */
 544 static int32_t rounder7[] ATTR_ALIGN(8) =
 545     rounder (-0.25);            /* C1*(C7/C4+C7-C1)/2 */
 546 static int32_t rounder2[] ATTR_ALIGN(8) =
 547     rounder (0.60355339059);    /* C2 * (C6+C2)/2 */
 548 static int32_t rounder6[] ATTR_ALIGN(8) =
 549     rounder (-0.25);            /* C2 * (C6-C2)/2 */
 550 static int32_t rounder3[] ATTR_ALIGN(8) =
 551     rounder (0.087788325588);   /* C3*(-C3/C4+C3+C5)/2 */
 552 static int32_t rounder5[] ATTR_ALIGN(8) =
 553     rounder (-0.441341716183);  /* C3*(-C5/C4+C5-C3)/2 */
 554
 555 #undef COL_SHIFT
 556 #undef ROW_SHIFT
 557
 558 #define declare_idct(idct,table,idct_row_head,idct_row,idct_row_tail,idct_row_mid)      \
 559 void idct (int16_t * block)                                     \
 560 {                                                                       \
 561     static int16_t table04[] ATTR_ALIGN(16) =                           \
 562         table (22725, 21407, 19266, 16384, 12873,  8867, 4520);         \
 563     static int16_t table17[] ATTR_ALIGN(16) =                           \
 564         table (31521, 29692, 26722, 22725, 17855, 12299, 6270);         \
 565     static int16_t table26[] ATTR_ALIGN(16) =                           \
 566         table (29692, 27969, 25172, 21407, 16819, 11585, 5906);         \
 567     static int16_t table35[] ATTR_ALIGN(16) =                           \
 568         table (26722, 25172, 22654, 19266, 15137, 10426, 5315);         \
 569                                                                         \
 570     idct_row_head (block, 0*8, table04);                                \
 571     idct_row (table04, rounder0);                                       \
 572     idct_row_mid (block, 0*8, 4*8, table04);                            \
 573     idct_row (table04, rounder4);                                       \
 574     idct_row_mid (block, 4*8, 1*8, table17);                            \
 575     idct_row (table17, rounder1);                                       \
 576     idct_row_mid (block, 1*8, 7*8, table17);                            \
 577     idct_row (table17, rounder7);                                       \
 578     idct_row_mid (block, 7*8, 2*8, table26);                            \
 579     idct_row (table26, rounder2);                                       \
 580     idct_row_mid (block, 2*8, 6*8, table26);                            \
 581     idct_row (table26, rounder6);                                       \
 582     idct_row_mid (block, 6*8, 3*8, table35);                            \
 583     idct_row (table35, rounder3);                                       \
 584     idct_row_mid (block, 3*8, 5*8, table35);                            \
 585     idct_row (table35, rounder5);                                       \
 586     idct_row_tail (block, 5*8);                                         \
 587                                                                         \
 588     idct_col (block, 0);                                                \
 589     idct_col (block, 4);                                                \
 590 }
 591
 592 void ff_mmx_idct(DCTELEM *block);
 593 void ff_mmxext_idct(DCTELEM *block);
 594
 595 declare_idct (ff_mmxext_idct, mmxext_table,
 596               mmxext_row_head, mmxext_row, mmxext_row_tail, mmxext_row_mid)
 597
 598 declare_idct (ff_mmx_idct, mmx_table,
 599               mmx_row_head, mmx_row, mmx_row_tail, mmx_row_mid)
 600