libavcodec/ppc/fdct_altivec.c

   1 /*
   2  * Copyright (C) 2003  James Klicman <james@klicman.org>
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav 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  * Libav 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 Libav; 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 "dsputil_altivec.h"
  27
  28 #define vs16(v) ((vector signed short)(v))
  29 #define vs32(v) ((vector signed int)(v))
  30 #define vu8(v)  ((vector unsigned char)(v))
  31 #define vu16(v) ((vector unsigned short)(v))
  32 #define vu32(v) ((vector unsigned int)(v))
  33
  34
  35 #define C1     0.98078525066375732421875000 /* cos(1*PI/16) */
  36 #define C2     0.92387950420379638671875000 /* cos(2*PI/16) */
  37 #define C3     0.83146959543228149414062500 /* cos(3*PI/16) */
  38 #define C4     0.70710676908493041992187500 /* cos(4*PI/16) */
  39 #define C5     0.55557024478912353515625000 /* cos(5*PI/16) */
  40 #define C6     0.38268342614173889160156250 /* cos(6*PI/16) */
  41 #define C7     0.19509032368659973144531250 /* cos(7*PI/16) */
  42 #define SQRT_2 1.41421353816986083984375000 /* sqrt(2)      */
  43
  44
  45 #define W0 -(2 * C2)
  46 #define W1 (2 * C6)
  47 #define W2 (SQRT_2 * C6)
  48 #define W3 (SQRT_2 * C3)
  49 #define W4 (SQRT_2 * (-C1 + C3 + C5 - C7))
  50 #define W5 (SQRT_2 * ( C1 + C3 - C5 + C7))
  51 #define W6 (SQRT_2 * ( C1 + C3 + C5 - C7))
  52 #define W7 (SQRT_2 * ( C1 + C3 - C5 - C7))
  53 #define W8 (SQRT_2 * ( C7 - C3))
  54 #define W9 (SQRT_2 * (-C1 - C3))
  55 #define WA (SQRT_2 * (-C3 - C5))
  56 #define WB (SQRT_2 * ( C5 - C3))
  57
  58
  59 static vector float fdctconsts[3] = {
  60     { W0, W1, W2, W3 },
  61     { W4, W5, W6, W7 },
  62     { W8, W9, WA, WB }
  63 };
  64
  65 #define LD_W0 vec_splat(cnsts0, 0)
  66 #define LD_W1 vec_splat(cnsts0, 1)
  67 #define LD_W2 vec_splat(cnsts0, 2)
  68 #define LD_W3 vec_splat(cnsts0, 3)
  69 #define LD_W4 vec_splat(cnsts1, 0)
  70 #define LD_W5 vec_splat(cnsts1, 1)
  71 #define LD_W6 vec_splat(cnsts1, 2)
  72 #define LD_W7 vec_splat(cnsts1, 3)
  73 #define LD_W8 vec_splat(cnsts2, 0)
  74 #define LD_W9 vec_splat(cnsts2, 1)
  75 #define LD_WA vec_splat(cnsts2, 2)
  76 #define LD_WB vec_splat(cnsts2, 3)
  77
  78
  79 #define FDCTROW(b0,b1,b2,b3,b4,b5,b6,b7) /* {{{ */                  \
  80     x0 = vec_add(b0, b7);               /* x0 = b0 + b7; */         \
  81     x7 = vec_sub(b0, b7);               /* x7 = b0 - b7; */         \
  82     x1 = vec_add(b1, b6);               /* x1 = b1 + b6; */         \
  83     x6 = vec_sub(b1, b6);               /* x6 = b1 - b6; */         \
  84     x2 = vec_add(b2, b5);               /* x2 = b2 + b5; */         \
  85     x5 = vec_sub(b2, b5);               /* x5 = b2 - b5; */         \
  86     x3 = vec_add(b3, b4);               /* x3 = b3 + b4; */         \
  87     x4 = vec_sub(b3, b4);               /* x4 = b3 - b4; */         \
  88                                                                     \
  89     b7 = vec_add(x0, x3);               /* b7 = x0 + x3; */         \
  90     b1 = vec_add(x1, x2);               /* b1 = x1 + x2; */         \
  91     b0 = vec_add(b7, b1);               /* b0 = b7 + b1; */         \
  92     b4 = vec_sub(b7, b1);               /* b4 = b7 - b1; */         \
  93                                                                     \
  94     b2 = vec_sub(x0, x3);               /* b2 = x0 - x3; */         \
  95     b6 = vec_sub(x1, x2);               /* b6 = x1 - x2; */         \
  96     b5 = vec_add(b6, b2);               /* b5 = b6 + b2; */         \
  97     cnst = LD_W2;                                                   \
  98     b5 = vec_madd(cnst, b5, mzero);     /* b5 = b5 * W2; */         \
  99     cnst = LD_W1;                                                   \
 100     b2 = vec_madd(cnst, b2, b5);        /* b2 = b5 + b2 * W1; */    \
 101     cnst = LD_W0;                                                   \
 102     b6 = vec_madd(cnst, b6, b5);        /* b6 = b5 + b6 * W0; */    \
 103                                                                     \
 104     x0 = vec_add(x4, x7);               /* x0 = x4 + x7; */         \
 105     x1 = vec_add(x5, x6);               /* x1 = x5 + x6; */         \
 106     x2 = vec_add(x4, x6);               /* x2 = x4 + x6; */         \
 107     x3 = vec_add(x5, x7);               /* x3 = x5 + x7; */         \
 108     x8 = vec_add(x2, x3);               /* x8 = x2 + x3; */         \
 109     cnst = LD_W3;                                                   \
 110     x8 = vec_madd(cnst, x8, mzero);     /* x8 = x8 * W3; */         \
 111                                                                     \
 112     cnst = LD_W8;                                                   \
 113     x0 = vec_madd(cnst, x0, mzero);     /* x0 *= W8; */             \
 114     cnst = LD_W9;                                                   \
 115     x1 = vec_madd(cnst, x1, mzero);     /* x1 *= W9; */             \
 116     cnst = LD_WA;                                                   \
 117     x2 = vec_madd(cnst, x2, x8);        /* x2 = x2 * WA + x8; */    \
 118     cnst = LD_WB;                                                   \
 119     x3 = vec_madd(cnst, x3, x8);        /* x3 = x3 * WB + x8; */    \
 120                                                                     \
 121     cnst = LD_W4;                                                   \
 122     b7 = vec_madd(cnst, x4, x0);        /* b7 = x4 * W4 + x0; */    \
 123     cnst = LD_W5;                                                   \
 124     b5 = vec_madd(cnst, x5, x1);        /* b5 = x5 * W5 + x1; */    \
 125     cnst = LD_W6;                                                   \
 126     b3 = vec_madd(cnst, x6, x1);        /* b3 = x6 * W6 + x1; */    \
 127     cnst = LD_W7;                                                   \
 128     b1 = vec_madd(cnst, x7, x0);        /* b1 = x7 * W7 + x0; */    \
 129                                                                     \
 130     b7 = vec_add(b7, x2);               /* b7 = b7 + x2; */         \
 131     b5 = vec_add(b5, x3);               /* b5 = b5 + x3; */         \
 132     b3 = vec_add(b3, x2);               /* b3 = b3 + x2; */         \
 133     b1 = vec_add(b1, x3);               /* b1 = b1 + x3; */         \
 134     /* }}} */
 135
 136 #define FDCTCOL(b0,b1,b2,b3,b4,b5,b6,b7) /* {{{ */                  \
 137     x0 = vec_add(b0, b7);               /* x0 = b0 + b7; */         \
 138     x7 = vec_sub(b0, b7);               /* x7 = b0 - b7; */         \
 139     x1 = vec_add(b1, b6);               /* x1 = b1 + b6; */         \
 140     x6 = vec_sub(b1, b6);               /* x6 = b1 - b6; */         \
 141     x2 = vec_add(b2, b5);               /* x2 = b2 + b5; */         \
 142     x5 = vec_sub(b2, b5);               /* x5 = b2 - b5; */         \
 143     x3 = vec_add(b3, b4);               /* x3 = b3 + b4; */         \
 144     x4 = vec_sub(b3, b4);               /* x4 = b3 - b4; */         \
 145                                                                     \
 146     b7 = vec_add(x0, x3);               /* b7 = x0 + x3; */         \
 147     b1 = vec_add(x1, x2);               /* b1 = x1 + x2; */         \
 148     b0 = vec_add(b7, b1);               /* b0 = b7 + b1; */         \
 149     b4 = vec_sub(b7, b1);               /* b4 = b7 - b1; */         \
 150                                                                     \
 151     b2 = vec_sub(x0, x3);               /* b2 = x0 - x3; */         \
 152     b6 = vec_sub(x1, x2);               /* b6 = x1 - x2; */         \
 153     b5 = vec_add(b6, b2);               /* b5 = b6 + b2; */         \
 154     cnst = LD_W2;                                                   \
 155     b5 = vec_madd(cnst, b5, mzero);     /* b5 = b5 * W2; */         \
 156     cnst = LD_W1;                                                   \
 157     b2 = vec_madd(cnst, b2, b5);        /* b2 = b5 + b2 * W1; */    \
 158     cnst = LD_W0;                                                   \
 159     b6 = vec_madd(cnst, b6, b5);        /* b6 = b5 + b6 * W0; */    \
 160                                                                     \
 161     x0 = vec_add(x4, x7);               /* x0 = x4 + x7; */         \
 162     x1 = vec_add(x5, x6);               /* x1 = x5 + x6; */         \
 163     x2 = vec_add(x4, x6);               /* x2 = x4 + x6; */         \
 164     x3 = vec_add(x5, x7);               /* x3 = x5 + x7; */         \
 165     x8 = vec_add(x2, x3);               /* x8 = x2 + x3; */         \
 166     cnst = LD_W3;                                                   \
 167     x8 = vec_madd(cnst, x8, mzero);     /* x8 = x8 * W3; */         \
 168                                                                     \
 169     cnst = LD_W8;                                                   \
 170     x0 = vec_madd(cnst, x0, mzero);     /* x0 *= W8; */             \
 171     cnst = LD_W9;                                                   \
 172     x1 = vec_madd(cnst, x1, mzero);     /* x1 *= W9; */             \
 173     cnst = LD_WA;                                                   \
 174     x2 = vec_madd(cnst, x2, x8);        /* x2 = x2 * WA + x8; */    \
 175     cnst = LD_WB;                                                   \
 176     x3 = vec_madd(cnst, x3, x8);        /* x3 = x3 * WB + x8; */    \
 177                                                                     \
 178     cnst = LD_W4;                                                   \
 179     b7 = vec_madd(cnst, x4, x0);        /* b7 = x4 * W4 + x0; */    \
 180     cnst = LD_W5;                                                   \
 181     b5 = vec_madd(cnst, x5, x1);        /* b5 = x5 * W5 + x1; */    \
 182     cnst = LD_W6;                                                   \
 183     b3 = vec_madd(cnst, x6, x1);        /* b3 = x6 * W6 + x1; */    \
 184     cnst = LD_W7;                                                   \
 185     b1 = vec_madd(cnst, x7, x0);        /* b1 = x7 * W7 + x0; */    \
 186                                                                     \
 187     b7 = vec_add(b7, x2);               /* b7 += x2; */             \
 188     b5 = vec_add(b5, x3);               /* b5 += x3; */             \
 189     b3 = vec_add(b3, x2);               /* b3 += x2; */             \
 190     b1 = vec_add(b1, x3);               /* b1 += x3; */             \
 191     /* }}} */
 192
 193
 194
 195 /* two dimensional discrete cosine transform */
 196
 197 void ff_fdct_altivec(int16_t *block)
 198 {
 199     vector signed short *bp;
 200     vector float *cp;
 201     vector float b00, b10, b20, b30, b40, b50, b60, b70;
 202     vector float b01, b11, b21, b31, b41, b51, b61, b71;
 203     vector float mzero, cnst, cnsts0, cnsts1, cnsts2;
 204     vector float x0, x1, x2, x3, x4, x5, x6, x7, x8;
 205
 206     /* setup constants {{{ */
 207     /* mzero = -0.0 */
 208     mzero = ((vector float)vec_splat_u32(-1));
 209     mzero = ((vector float)vec_sl(vu32(mzero), vu32(mzero)));
 210     cp = fdctconsts;
 211     cnsts0 = vec_ld(0, cp); cp++;
 212     cnsts1 = vec_ld(0, cp); cp++;
 213     cnsts2 = vec_ld(0, cp);
 214     /* }}} */
 215
 216
 217     /* 8x8 matrix transpose (vector short[8]) {{{ */
 218 #define MERGE_S16(hl,a,b) vec_merge##hl(vs16(a), vs16(b))
 219
 220     bp = (vector signed short*)block;
 221     b00 = ((vector float)vec_ld(0,    bp));
 222     b40 = ((vector float)vec_ld(16*4, bp));
 223     b01 = ((vector float)MERGE_S16(h, b00, b40));
 224     b11 = ((vector float)MERGE_S16(l, b00, b40));
 225     bp++;
 226     b10 = ((vector float)vec_ld(0,    bp));
 227     b50 = ((vector float)vec_ld(16*4, bp));
 228     b21 = ((vector float)MERGE_S16(h, b10, b50));
 229     b31 = ((vector float)MERGE_S16(l, b10, b50));
 230     bp++;
 231     b20 = ((vector float)vec_ld(0,    bp));
 232     b60 = ((vector float)vec_ld(16*4, bp));
 233     b41 = ((vector float)MERGE_S16(h, b20, b60));
 234     b51 = ((vector float)MERGE_S16(l, b20, b60));
 235     bp++;
 236     b30 = ((vector float)vec_ld(0,    bp));
 237     b70 = ((vector float)vec_ld(16*4, bp));
 238     b61 = ((vector float)MERGE_S16(h, b30, b70));
 239     b71 = ((vector float)MERGE_S16(l, b30, b70));
 240
 241     x0 = ((vector float)MERGE_S16(h, b01, b41));
 242     x1 = ((vector float)MERGE_S16(l, b01, b41));
 243     x2 = ((vector float)MERGE_S16(h, b11, b51));
 244     x3 = ((vector float)MERGE_S16(l, b11, b51));
 245     x4 = ((vector float)MERGE_S16(h, b21, b61));
 246     x5 = ((vector float)MERGE_S16(l, b21, b61));
 247     x6 = ((vector float)MERGE_S16(h, b31, b71));
 248     x7 = ((vector float)MERGE_S16(l, b31, b71));
 249
 250     b00 = ((vector float)MERGE_S16(h, x0, x4));
 251     b10 = ((vector float)MERGE_S16(l, x0, x4));
 252     b20 = ((vector float)MERGE_S16(h, x1, x5));
 253     b30 = ((vector float)MERGE_S16(l, x1, x5));
 254     b40 = ((vector float)MERGE_S16(h, x2, x6));
 255     b50 = ((vector float)MERGE_S16(l, x2, x6));
 256     b60 = ((vector float)MERGE_S16(h, x3, x7));
 257     b70 = ((vector float)MERGE_S16(l, x3, x7));
 258
 259 #undef MERGE_S16
 260     /* }}} */
 261
 262
 263 /* Some of the initial calculations can be done as vector short before
 264  * conversion to vector float.  The following code section takes advantage
 265  * of this.
 266  */
 267     /* fdct rows {{{ */
 268     x0 = ((vector float)vec_add(vs16(b00), vs16(b70)));
 269     x7 = ((vector float)vec_sub(vs16(b00), vs16(b70)));
 270     x1 = ((vector float)vec_add(vs16(b10), vs16(b60)));
 271     x6 = ((vector float)vec_sub(vs16(b10), vs16(b60)));
 272     x2 = ((vector float)vec_add(vs16(b20), vs16(b50)));
 273     x5 = ((vector float)vec_sub(vs16(b20), vs16(b50)));
 274     x3 = ((vector float)vec_add(vs16(b30), vs16(b40)));
 275     x4 = ((vector float)vec_sub(vs16(b30), vs16(b40)));
 276
 277     b70 = ((vector float)vec_add(vs16(x0), vs16(x3)));
 278     b10 = ((vector float)vec_add(vs16(x1), vs16(x2)));
 279
 280     b00 = ((vector float)vec_add(vs16(b70), vs16(b10)));
 281     b40 = ((vector float)vec_sub(vs16(b70), vs16(b10)));
 282
 283 #define CTF0(n) \
 284     b##n##1 = ((vector float)vec_unpackl(vs16(b##n##0))); \
 285     b##n##0 = ((vector float)vec_unpackh(vs16(b##n##0))); \
 286     b##n##1 = vec_ctf(vs32(b##n##1), 0); \
 287     b##n##0 = vec_ctf(vs32(b##n##0), 0);
 288
 289     CTF0(0);
 290     CTF0(4);
 291
 292     b20 = ((vector float)vec_sub(vs16(x0), vs16(x3)));
 293     b60 = ((vector float)vec_sub(vs16(x1), vs16(x2)));
 294
 295     CTF0(2);
 296     CTF0(6);
 297
 298 #undef CTF0
 299
 300     x0 = vec_add(b60, b20);
 301     x1 = vec_add(b61, b21);
 302
 303     cnst = LD_W2;
 304     x0 = vec_madd(cnst, x0, mzero);
 305     x1 = vec_madd(cnst, x1, mzero);
 306     cnst = LD_W1;
 307     b20 = vec_madd(cnst, b20, x0);
 308     b21 = vec_madd(cnst, b21, x1);
 309     cnst = LD_W0;
 310     b60 = vec_madd(cnst, b60, x0);
 311     b61 = vec_madd(cnst, b61, x1);
 312
 313 #define CTFX(x,b) \
 314     b##0 = ((vector float)vec_unpackh(vs16(x))); \
 315     b##1 = ((vector float)vec_unpackl(vs16(x))); \
 316     b##0 = vec_ctf(vs32(b##0), 0); \
 317     b##1 = vec_ctf(vs32(b##1), 0); \
 318
 319     CTFX(x4, b7);
 320     CTFX(x5, b5);
 321     CTFX(x6, b3);
 322     CTFX(x7, b1);
 323
 324 #undef CTFX
 325
 326
 327     x0 = vec_add(b70, b10);
 328     x1 = vec_add(b50, b30);
 329     x2 = vec_add(b70, b30);
 330     x3 = vec_add(b50, b10);
 331     x8 = vec_add(x2, x3);
 332     cnst = LD_W3;
 333     x8 = vec_madd(cnst, x8, mzero);
 334
 335     cnst = LD_W8;
 336     x0 = vec_madd(cnst, x0, mzero);
 337     cnst = LD_W9;
 338     x1 = vec_madd(cnst, x1, mzero);
 339     cnst = LD_WA;
 340     x2 = vec_madd(cnst, x2, x8);
 341     cnst = LD_WB;
 342     x3 = vec_madd(cnst, x3, x8);
 343
 344     cnst = LD_W4;
 345     b70 = vec_madd(cnst, b70, x0);
 346     cnst = LD_W5;
 347     b50 = vec_madd(cnst, b50, x1);
 348     cnst = LD_W6;
 349     b30 = vec_madd(cnst, b30, x1);
 350     cnst = LD_W7;
 351     b10 = vec_madd(cnst, b10, x0);
 352
 353     b70 = vec_add(b70, x2);
 354     b50 = vec_add(b50, x3);
 355     b30 = vec_add(b30, x2);
 356     b10 = vec_add(b10, x3);
 357
 358
 359     x0 = vec_add(b71, b11);
 360     x1 = vec_add(b51, b31);
 361     x2 = vec_add(b71, b31);
 362     x3 = vec_add(b51, b11);
 363     x8 = vec_add(x2, x3);
 364     cnst = LD_W3;
 365     x8 = vec_madd(cnst, x8, mzero);
 366
 367     cnst = LD_W8;
 368     x0 = vec_madd(cnst, x0, mzero);
 369     cnst = LD_W9;
 370     x1 = vec_madd(cnst, x1, mzero);
 371     cnst = LD_WA;
 372     x2 = vec_madd(cnst, x2, x8);
 373     cnst = LD_WB;
 374     x3 = vec_madd(cnst, x3, x8);
 375
 376     cnst = LD_W4;
 377     b71 = vec_madd(cnst, b71, x0);
 378     cnst = LD_W5;
 379     b51 = vec_madd(cnst, b51, x1);
 380     cnst = LD_W6;
 381     b31 = vec_madd(cnst, b31, x1);
 382     cnst = LD_W7;
 383     b11 = vec_madd(cnst, b11, x0);
 384
 385     b71 = vec_add(b71, x2);
 386     b51 = vec_add(b51, x3);
 387     b31 = vec_add(b31, x2);
 388     b11 = vec_add(b11, x3);
 389     /* }}} */
 390
 391
 392     /* 8x8 matrix transpose (vector float[8][2]) {{{ */
 393     x0 = vec_mergel(b00, b20);
 394     x1 = vec_mergeh(b00, b20);
 395     x2 = vec_mergel(b10, b30);
 396     x3 = vec_mergeh(b10, b30);
 397
 398     b00 = vec_mergeh(x1, x3);
 399     b10 = vec_mergel(x1, x3);
 400     b20 = vec_mergeh(x0, x2);
 401     b30 = vec_mergel(x0, x2);
 402
 403     x4 = vec_mergel(b41, b61);
 404     x5 = vec_mergeh(b41, b61);
 405     x6 = vec_mergel(b51, b71);
 406     x7 = vec_mergeh(b51, b71);
 407
 408     b41 = vec_mergeh(x5, x7);
 409     b51 = vec_mergel(x5, x7);
 410     b61 = vec_mergeh(x4, x6);
 411     b71 = vec_mergel(x4, x6);
 412
 413     x0 = vec_mergel(b01, b21);
 414     x1 = vec_mergeh(b01, b21);
 415     x2 = vec_mergel(b11, b31);
 416     x3 = vec_mergeh(b11, b31);
 417
 418     x4 = vec_mergel(b40, b60);
 419     x5 = vec_mergeh(b40, b60);
 420     x6 = vec_mergel(b50, b70);
 421     x7 = vec_mergeh(b50, b70);
 422
 423     b40 = vec_mergeh(x1, x3);
 424     b50 = vec_mergel(x1, x3);
 425     b60 = vec_mergeh(x0, x2);
 426     b70 = vec_mergel(x0, x2);
 427
 428     b01 = vec_mergeh(x5, x7);
 429     b11 = vec_mergel(x5, x7);
 430     b21 = vec_mergeh(x4, x6);
 431     b31 = vec_mergel(x4, x6);
 432     /* }}} */
 433
 434
 435     FDCTCOL(b00, b10, b20, b30, b40, b50, b60, b70);
 436     FDCTCOL(b01, b11, b21, b31, b41, b51, b61, b71);
 437
 438
 439     /* round, convert back to short {{{ */
 440 #define CTS(n) \
 441     b##n##0 = vec_round(b##n##0); \
 442     b##n##1 = vec_round(b##n##1); \
 443     b##n##0 = ((vector float)vec_cts(b##n##0, 0)); \
 444     b##n##1 = ((vector float)vec_cts(b##n##1, 0)); \
 445     b##n##0 = ((vector float)vec_pack(vs32(b##n##0), vs32(b##n##1))); \
 446     vec_st(vs16(b##n##0), 0, bp);
 447
 448     bp = (vector signed short*)block;
 449     CTS(0); bp++;
 450     CTS(1); bp++;
 451     CTS(2); bp++;
 452     CTS(3); bp++;
 453     CTS(4); bp++;
 454     CTS(5); bp++;
 455     CTS(6); bp++;
 456     CTS(7);
 457
 458 #undef CTS
 459     /* }}} */
 460 }
 461
 462 /* vim:set foldmethod=marker foldlevel=0: */