libavcodec/ppc/fdct_altivec.c

   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 file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg 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 GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22
  23 #include "libavutil/common.h"
  24 #include "libavcodec/dsputil.h"
  25 #include "dsputil_ppc.h"
  26 #include "gcc_fixes.h"
  27
  28
  29 #define vs16(v) ((vector signed short)(v))
  30 #define vs32(v) ((vector signed int)(v))
  31 #define vu8(v)  ((vector unsigned char)(v))
  32 #define vu16(v) ((vector unsigned short)(v))
  33 #define vu32(v) ((vector unsigned int)(v))
  34
  35
  36 #define C1     0.98078525066375732421875000 /* cos(1*PI/16) */
  37 #define C2     0.92387950420379638671875000 /* cos(2*PI/16) */
  38 #define C3     0.83146959543228149414062500 /* cos(3*PI/16) */
  39 #define C4     0.70710676908493041992187500 /* cos(4*PI/16) */
  40 #define C5     0.55557024478912353515625000 /* cos(5*PI/16) */
  41 #define C6     0.38268342614173889160156250 /* cos(6*PI/16) */
  42 #define C7     0.19509032368659973144531250 /* cos(7*PI/16) */
  43 #define SQRT_2 1.41421353816986083984375000 /* sqrt(2)      */
  44
  45
  46 #define W0 -(2 * C2)
  47 #define W1 (2 * C6)
  48 #define W2 (SQRT_2 * C6)
  49 #define W3 (SQRT_2 * C3)
  50 #define W4 (SQRT_2 * (-C1 + C3 + C5 - C7))
  51 #define W5 (SQRT_2 * ( C1 + C3 - C5 + C7))
  52 #define W6 (SQRT_2 * ( C1 + C3 + C5 - C7))
  53 #define W7 (SQRT_2 * ( C1 + C3 - C5 - C7))
  54 #define W8 (SQRT_2 * ( C7 - C3))
  55 #define W9 (SQRT_2 * (-C1 - C3))
  56 #define WA (SQRT_2 * (-C3 - C5))
  57 #define WB (SQRT_2 * ( C5 - C3))
  58
  59
  60 static vector float fdctconsts[3] = {
  61     (vector float)AVV( W0, W1, W2, W3 ),
  62     (vector float)AVV( W4, W5, W6, W7 ),
  63     (vector float)AVV( W8, W9, WA, WB )
  64 };
  65
  66 #define LD_W0 vec_splat(cnsts0, 0)
  67 #define LD_W1 vec_splat(cnsts0, 1)
  68 #define LD_W2 vec_splat(cnsts0, 2)
  69 #define LD_W3 vec_splat(cnsts0, 3)
  70 #define LD_W4 vec_splat(cnsts1, 0)
  71 #define LD_W5 vec_splat(cnsts1, 1)
  72 #define LD_W6 vec_splat(cnsts1, 2)
  73 #define LD_W7 vec_splat(cnsts1, 3)
  74 #define LD_W8 vec_splat(cnsts2, 0)
  75 #define LD_W9 vec_splat(cnsts2, 1)
  76 #define LD_WA vec_splat(cnsts2, 2)
  77 #define LD_WB vec_splat(cnsts2, 3)
  78
  79
  80 #define FDCTROW(b0,b1,b2,b3,b4,b5,b6,b7) /* {{{ */                  \
  81     x0 = vec_add(b0, b7);               /* x0 = b0 + b7; */         \
  82     x7 = vec_sub(b0, b7);               /* x7 = b0 - b7; */         \
  83     x1 = vec_add(b1, b6);               /* x1 = b1 + b6; */         \
  84     x6 = vec_sub(b1, b6);               /* x6 = b1 - b6; */         \
  85     x2 = vec_add(b2, b5);               /* x2 = b2 + b5; */         \
  86     x5 = vec_sub(b2, b5);               /* x5 = b2 - b5; */         \
  87     x3 = vec_add(b3, b4);               /* x3 = b3 + b4; */         \
  88     x4 = vec_sub(b3, b4);               /* x4 = b3 - b4; */         \
  89                                                                     \
  90     b7 = vec_add(x0, x3);               /* b7 = x0 + x3; */         \
  91     b1 = vec_add(x1, x2);               /* b1 = x1 + x2; */         \
  92     b0 = vec_add(b7, b1);               /* b0 = b7 + b1; */         \
  93     b4 = vec_sub(b7, b1);               /* b4 = b7 - b1; */         \
  94                                                                     \
  95     b2 = vec_sub(x0, x3);               /* b2 = x0 - x3; */         \
  96     b6 = vec_sub(x1, x2);               /* b6 = x1 - x2; */         \
  97     b5 = vec_add(b6, b2);               /* b5 = b6 + b2; */         \
  98     cnst = LD_W2;                                                   \
  99     b5 = vec_madd(cnst, b5, mzero);     /* b5 = b5 * W2; */         \
 100     cnst = LD_W1;                                                   \
 101     b2 = vec_madd(cnst, b2, b5);        /* b2 = b5 + b2 * W1; */    \
 102     cnst = LD_W0;                                                   \
 103     b6 = vec_madd(cnst, b6, b5);        /* b6 = b5 + b6 * W0; */    \
 104                                                                     \
 105     x0 = vec_add(x4, x7);               /* x0 = x4 + x7; */         \
 106     x1 = vec_add(x5, x6);               /* x1 = x5 + x6; */         \
 107     x2 = vec_add(x4, x6);               /* x2 = x4 + x6; */         \
 108     x3 = vec_add(x5, x7);               /* x3 = x5 + x7; */         \
 109     x8 = vec_add(x2, x3);               /* x8 = x2 + x3; */         \
 110     cnst = LD_W3;                                                   \
 111     x8 = vec_madd(cnst, x8, mzero);     /* x8 = x8 * W3; */         \
 112                                                                     \
 113     cnst = LD_W8;                                                   \
 114     x0 = vec_madd(cnst, x0, mzero);     /* x0 *= W8; */             \
 115     cnst = LD_W9;                                                   \
 116     x1 = vec_madd(cnst, x1, mzero);     /* x1 *= W9; */             \
 117     cnst = LD_WA;                                                   \
 118     x2 = vec_madd(cnst, x2, x8);        /* x2 = x2 * WA + x8; */    \
 119     cnst = LD_WB;                                                   \
 120     x3 = vec_madd(cnst, x3, x8);        /* x3 = x3 * WB + x8; */    \
 121                                                                     \
 122     cnst = LD_W4;                                                   \
 123     b7 = vec_madd(cnst, x4, x0);        /* b7 = x4 * W4 + x0; */    \
 124     cnst = LD_W5;                                                   \
 125     b5 = vec_madd(cnst, x5, x1);        /* b5 = x5 * W5 + x1; */    \
 126     cnst = LD_W6;                                                   \
 127     b3 = vec_madd(cnst, x6, x1);        /* b3 = x6 * W6 + x1; */    \
 128     cnst = LD_W7;                                                   \
 129     b1 = vec_madd(cnst, x7, x0);        /* b1 = x7 * W7 + x0; */    \
 130                                                                     \
 131     b7 = vec_add(b7, x2);               /* b7 = b7 + x2; */         \
 132     b5 = vec_add(b5, x3);               /* b5 = b5 + x3; */         \
 133     b3 = vec_add(b3, x2);               /* b3 = b3 + x2; */         \
 134     b1 = vec_add(b1, x3);               /* b1 = b1 + x3; */         \
 135     /* }}} */
 136
 137 #define FDCTCOL(b0,b1,b2,b3,b4,b5,b6,b7) /* {{{ */                  \
 138     x0 = vec_add(b0, b7);               /* x0 = b0 + b7; */         \
 139     x7 = vec_sub(b0, b7);               /* x7 = b0 - b7; */         \
 140     x1 = vec_add(b1, b6);               /* x1 = b1 + b6; */         \
 141     x6 = vec_sub(b1, b6);               /* x6 = b1 - b6; */         \
 142     x2 = vec_add(b2, b5);               /* x2 = b2 + b5; */         \
 143     x5 = vec_sub(b2, b5);               /* x5 = b2 - b5; */         \
 144     x3 = vec_add(b3, b4);               /* x3 = b3 + b4; */         \
 145     x4 = vec_sub(b3, b4);               /* x4 = b3 - b4; */         \
 146                                                                     \
 147     b7 = vec_add(x0, x3);               /* b7 = x0 + x3; */         \
 148     b1 = vec_add(x1, x2);               /* b1 = x1 + x2; */         \
 149     b0 = vec_add(b7, b1);               /* b0 = b7 + b1; */         \
 150     b4 = vec_sub(b7, b1);               /* b4 = b7 - b1; */         \
 151                                                                     \
 152     b2 = vec_sub(x0, x3);               /* b2 = x0 - x3; */         \
 153     b6 = vec_sub(x1, x2);               /* b6 = x1 - x2; */         \
 154     b5 = vec_add(b6, b2);               /* b5 = b6 + b2; */         \
 155     cnst = LD_W2;                                                   \
 156     b5 = vec_madd(cnst, b5, mzero);     /* b5 = b5 * W2; */         \
 157     cnst = LD_W1;                                                   \
 158     b2 = vec_madd(cnst, b2, b5);        /* b2 = b5 + b2 * W1; */    \
 159     cnst = LD_W0;                                                   \
 160     b6 = vec_madd(cnst, b6, b5);        /* b6 = b5 + b6 * W0; */    \
 161                                                                     \
 162     x0 = vec_add(x4, x7);               /* x0 = x4 + x7; */         \
 163     x1 = vec_add(x5, x6);               /* x1 = x5 + x6; */         \
 164     x2 = vec_add(x4, x6);               /* x2 = x4 + x6; */         \
 165     x3 = vec_add(x5, x7);               /* x3 = x5 + x7; */         \
 166     x8 = vec_add(x2, x3);               /* x8 = x2 + x3; */         \
 167     cnst = LD_W3;                                                   \
 168     x8 = vec_madd(cnst, x8, mzero);     /* x8 = x8 * W3; */         \
 169                                                                     \
 170     cnst = LD_W8;                                                   \
 171     x0 = vec_madd(cnst, x0, mzero);     /* x0 *= W8; */             \
 172     cnst = LD_W9;                                                   \
 173     x1 = vec_madd(cnst, x1, mzero);     /* x1 *= W9; */             \
 174     cnst = LD_WA;                                                   \
 175     x2 = vec_madd(cnst, x2, x8);        /* x2 = x2 * WA + x8; */    \
 176     cnst = LD_WB;                                                   \
 177     x3 = vec_madd(cnst, x3, x8);        /* x3 = x3 * WB + x8; */    \
 178                                                                     \
 179     cnst = LD_W4;                                                   \
 180     b7 = vec_madd(cnst, x4, x0);        /* b7 = x4 * W4 + x0; */    \
 181     cnst = LD_W5;                                                   \
 182     b5 = vec_madd(cnst, x5, x1);        /* b5 = x5 * W5 + x1; */    \
 183     cnst = LD_W6;                                                   \
 184     b3 = vec_madd(cnst, x6, x1);        /* b3 = x6 * W6 + x1; */    \
 185     cnst = LD_W7;                                                   \
 186     b1 = vec_madd(cnst, x7, x0);        /* b1 = x7 * W7 + x0; */    \
 187                                                                     \
 188     b7 = vec_add(b7, x2);               /* b7 += x2; */             \
 189     b5 = vec_add(b5, x3);               /* b5 += x3; */             \
 190     b3 = vec_add(b3, x2);               /* b3 += x2; */             \
 191     b1 = vec_add(b1, x3);               /* b1 += x3; */             \
 192     /* }}} */
 193
 194
 195
 196 /* two dimensional discrete cosine transform */
 197
 198 void fdct_altivec(int16_t *block)
 199 {
 200 POWERPC_PERF_DECLARE(altivec_fdct, 1);
 201     vector signed short *bp;
 202     vector float *cp;
 203     vector float b00, b10, b20, b30, b40, b50, b60, b70;
 204     vector float b01, b11, b21, b31, b41, b51, b61, b71;
 205     vector float mzero, cnst, cnsts0, cnsts1, cnsts2;
 206     vector float x0, x1, x2, x3, x4, x5, x6, x7, x8;
 207
 208     POWERPC_PERF_START_COUNT(altivec_fdct, 1);
 209
 210
 211     /* setup constants {{{ */
 212     /* mzero = -0.0 */
 213     mzero = ((vector float)vec_splat_u32(-1));
 214     mzero = ((vector float)vec_sl(vu32(mzero), vu32(mzero)));
 215     cp = fdctconsts;
 216     cnsts0 = vec_ld(0, cp); cp++;
 217     cnsts1 = vec_ld(0, cp); cp++;
 218     cnsts2 = vec_ld(0, cp);
 219     /* }}} */
 220
 221
 222     /* 8x8 matrix transpose (vector short[8]) {{{ */
 223 #define MERGE_S16(hl,a,b) vec_merge##hl(vs16(a), vs16(b))
 224
 225     bp = (vector signed short*)block;
 226     b00 = ((vector float)vec_ld(0,    bp));
 227     b40 = ((vector float)vec_ld(16*4, bp));
 228     b01 = ((vector float)MERGE_S16(h, b00, b40));
 229     b11 = ((vector float)MERGE_S16(l, b00, b40));
 230     bp++;
 231     b10 = ((vector float)vec_ld(0,    bp));
 232     b50 = ((vector float)vec_ld(16*4, bp));
 233     b21 = ((vector float)MERGE_S16(h, b10, b50));
 234     b31 = ((vector float)MERGE_S16(l, b10, b50));
 235     bp++;
 236     b20 = ((vector float)vec_ld(0,    bp));
 237     b60 = ((vector float)vec_ld(16*4, bp));
 238     b41 = ((vector float)MERGE_S16(h, b20, b60));
 239     b51 = ((vector float)MERGE_S16(l, b20, b60));
 240     bp++;
 241     b30 = ((vector float)vec_ld(0,    bp));
 242     b70 = ((vector float)vec_ld(16*4, bp));
 243     b61 = ((vector float)MERGE_S16(h, b30, b70));
 244     b71 = ((vector float)MERGE_S16(l, b30, b70));
 245
 246     x0 = ((vector float)MERGE_S16(h, b01, b41));
 247     x1 = ((vector float)MERGE_S16(l, b01, b41));
 248     x2 = ((vector float)MERGE_S16(h, b11, b51));
 249     x3 = ((vector float)MERGE_S16(l, b11, b51));
 250     x4 = ((vector float)MERGE_S16(h, b21, b61));
 251     x5 = ((vector float)MERGE_S16(l, b21, b61));
 252     x6 = ((vector float)MERGE_S16(h, b31, b71));
 253     x7 = ((vector float)MERGE_S16(l, b31, b71));
 254
 255     b00 = ((vector float)MERGE_S16(h, x0, x4));
 256     b10 = ((vector float)MERGE_S16(l, x0, x4));
 257     b20 = ((vector float)MERGE_S16(h, x1, x5));
 258     b30 = ((vector float)MERGE_S16(l, x1, x5));
 259     b40 = ((vector float)MERGE_S16(h, x2, x6));
 260     b50 = ((vector float)MERGE_S16(l, x2, x6));
 261     b60 = ((vector float)MERGE_S16(h, x3, x7));
 262     b70 = ((vector float)MERGE_S16(l, x3, x7));
 263
 264 #undef MERGE_S16
 265     /* }}} */
 266
 267
 268 /* Some of the initial calculations can be done as vector short before
 269  * conversion to vector float.  The following code section takes advantage
 270  * of this.
 271  */
 272 #if 1
 273     /* fdct rows {{{ */
 274     x0 = ((vector float)vec_add(vs16(b00), vs16(b70)));
 275     x7 = ((vector float)vec_sub(vs16(b00), vs16(b70)));
 276     x1 = ((vector float)vec_add(vs16(b10), vs16(b60)));
 277     x6 = ((vector float)vec_sub(vs16(b10), vs16(b60)));
 278     x2 = ((vector float)vec_add(vs16(b20), vs16(b50)));
 279     x5 = ((vector float)vec_sub(vs16(b20), vs16(b50)));
 280     x3 = ((vector float)vec_add(vs16(b30), vs16(b40)));
 281     x4 = ((vector float)vec_sub(vs16(b30), vs16(b40)));
 282
 283     b70 = ((vector float)vec_add(vs16(x0), vs16(x3)));
 284     b10 = ((vector float)vec_add(vs16(x1), vs16(x2)));
 285
 286     b00 = ((vector float)vec_add(vs16(b70), vs16(b10)));
 287     b40 = ((vector float)vec_sub(vs16(b70), vs16(b10)));
 288
 289 #define CTF0(n) \
 290     b##n##1 = ((vector float)vec_unpackl(vs16(b##n##0))); \
 291     b##n##0 = ((vector float)vec_unpackh(vs16(b##n##0))); \
 292     b##n##1 = vec_ctf(vs32(b##n##1), 0); \
 293     b##n##0 = vec_ctf(vs32(b##n##0), 0);
 294
 295     CTF0(0);
 296     CTF0(4);
 297
 298     b20 = ((vector float)vec_sub(vs16(x0), vs16(x3)));
 299     b60 = ((vector float)vec_sub(vs16(x1), vs16(x2)));
 300
 301     CTF0(2);
 302     CTF0(6);
 303
 304 #undef CTF0
 305
 306     x0 = vec_add(b60, b20);
 307     x1 = vec_add(b61, b21);
 308
 309     cnst = LD_W2;
 310     x0 = vec_madd(cnst, x0, mzero);
 311     x1 = vec_madd(cnst, x1, mzero);
 312     cnst = LD_W1;
 313     b20 = vec_madd(cnst, b20, x0);
 314     b21 = vec_madd(cnst, b21, x1);
 315     cnst = LD_W0;
 316     b60 = vec_madd(cnst, b60, x0);
 317     b61 = vec_madd(cnst, b61, x1);
 318
 319 #define CTFX(x,b) \
 320     b##0 = ((vector float)vec_unpackh(vs16(x))); \
 321     b##1 = ((vector float)vec_unpackl(vs16(x))); \
 322     b##0 = vec_ctf(vs32(b##0), 0); \
 323     b##1 = vec_ctf(vs32(b##1), 0); \
 324
 325     CTFX(x4, b7);
 326     CTFX(x5, b5);
 327     CTFX(x6, b3);
 328     CTFX(x7, b1);
 329
 330 #undef CTFX
 331
 332
 333     x0 = vec_add(b70, b10);
 334     x1 = vec_add(b50, b30);
 335     x2 = vec_add(b70, b30);
 336     x3 = vec_add(b50, b10);
 337     x8 = vec_add(x2, x3);
 338     cnst = LD_W3;
 339     x8 = vec_madd(cnst, x8, mzero);
 340
 341     cnst = LD_W8;
 342     x0 = vec_madd(cnst, x0, mzero);
 343     cnst = LD_W9;
 344     x1 = vec_madd(cnst, x1, mzero);
 345     cnst = LD_WA;
 346     x2 = vec_madd(cnst, x2, x8);
 347     cnst = LD_WB;
 348     x3 = vec_madd(cnst, x3, x8);
 349
 350     cnst = LD_W4;
 351     b70 = vec_madd(cnst, b70, x0);
 352     cnst = LD_W5;
 353     b50 = vec_madd(cnst, b50, x1);
 354     cnst = LD_W6;
 355     b30 = vec_madd(cnst, b30, x1);
 356     cnst = LD_W7;
 357     b10 = vec_madd(cnst, b10, x0);
 358
 359     b70 = vec_add(b70, x2);
 360     b50 = vec_add(b50, x3);
 361     b30 = vec_add(b30, x2);
 362     b10 = vec_add(b10, x3);
 363
 364
 365     x0 = vec_add(b71, b11);
 366     x1 = vec_add(b51, b31);
 367     x2 = vec_add(b71, b31);
 368     x3 = vec_add(b51, b11);
 369     x8 = vec_add(x2, x3);
 370     cnst = LD_W3;
 371     x8 = vec_madd(cnst, x8, mzero);
 372
 373     cnst = LD_W8;
 374     x0 = vec_madd(cnst, x0, mzero);
 375     cnst = LD_W9;
 376     x1 = vec_madd(cnst, x1, mzero);
 377     cnst = LD_WA;
 378     x2 = vec_madd(cnst, x2, x8);
 379     cnst = LD_WB;
 380     x3 = vec_madd(cnst, x3, x8);
 381
 382     cnst = LD_W4;
 383     b71 = vec_madd(cnst, b71, x0);
 384     cnst = LD_W5;
 385     b51 = vec_madd(cnst, b51, x1);
 386     cnst = LD_W6;
 387     b31 = vec_madd(cnst, b31, x1);
 388     cnst = LD_W7;
 389     b11 = vec_madd(cnst, b11, x0);
 390
 391     b71 = vec_add(b71, x2);
 392     b51 = vec_add(b51, x3);
 393     b31 = vec_add(b31, x2);
 394     b11 = vec_add(b11, x3);
 395     /* }}} */
 396 #else
 397     /* convert to float {{{ */
 398 #define CTF(n) \
 399     vs32(b##n##1) = vec_unpackl(vs16(b##n##0)); \
 400     vs32(b##n##0) = vec_unpackh(vs16(b##n##0)); \
 401     b##n##1 = vec_ctf(vs32(b##n##1), 0); \
 402     b##n##0 = vec_ctf(vs32(b##n##0), 0); \
 403
 404     CTF(0);
 405     CTF(1);
 406     CTF(2);
 407     CTF(3);
 408     CTF(4);
 409     CTF(5);
 410     CTF(6);
 411     CTF(7);
 412
 413 #undef CTF
 414     /* }}} */
 415
 416     FDCTROW(b00, b10, b20, b30, b40, b50, b60, b70);
 417     FDCTROW(b01, b11, b21, b31, b41, b51, b61, b71);
 418 #endif
 419
 420
 421     /* 8x8 matrix transpose (vector float[8][2]) {{{ */
 422     x0 = vec_mergel(b00, b20);
 423     x1 = vec_mergeh(b00, b20);
 424     x2 = vec_mergel(b10, b30);
 425     x3 = vec_mergeh(b10, b30);
 426
 427     b00 = vec_mergeh(x1, x3);
 428     b10 = vec_mergel(x1, x3);
 429     b20 = vec_mergeh(x0, x2);
 430     b30 = vec_mergel(x0, x2);
 431
 432     x4 = vec_mergel(b41, b61);
 433     x5 = vec_mergeh(b41, b61);
 434     x6 = vec_mergel(b51, b71);
 435     x7 = vec_mergeh(b51, b71);
 436
 437     b41 = vec_mergeh(x5, x7);
 438     b51 = vec_mergel(x5, x7);
 439     b61 = vec_mergeh(x4, x6);
 440     b71 = vec_mergel(x4, x6);
 441
 442     x0 = vec_mergel(b01, b21);
 443     x1 = vec_mergeh(b01, b21);
 444     x2 = vec_mergel(b11, b31);
 445     x3 = vec_mergeh(b11, b31);
 446
 447     x4 = vec_mergel(b40, b60);
 448     x5 = vec_mergeh(b40, b60);
 449     x6 = vec_mergel(b50, b70);
 450     x7 = vec_mergeh(b50, b70);
 451
 452     b40 = vec_mergeh(x1, x3);
 453     b50 = vec_mergel(x1, x3);
 454     b60 = vec_mergeh(x0, x2);
 455     b70 = vec_mergel(x0, x2);
 456
 457     b01 = vec_mergeh(x5, x7);
 458     b11 = vec_mergel(x5, x7);
 459     b21 = vec_mergeh(x4, x6);
 460     b31 = vec_mergel(x4, x6);
 461     /* }}} */
 462
 463
 464     FDCTCOL(b00, b10, b20, b30, b40, b50, b60, b70);
 465     FDCTCOL(b01, b11, b21, b31, b41, b51, b61, b71);
 466
 467
 468     /* round, convert back to short {{{ */
 469 #define CTS(n) \
 470     b##n##0 = vec_round(b##n##0); \
 471     b##n##1 = vec_round(b##n##1); \
 472     b##n##0 = ((vector float)vec_cts(b##n##0, 0)); \
 473     b##n##1 = ((vector float)vec_cts(b##n##1, 0)); \
 474     b##n##0 = ((vector float)vec_pack(vs32(b##n##0), vs32(b##n##1))); \
 475     vec_st(vs16(b##n##0), 0, bp);
 476
 477     bp = (vector signed short*)block;
 478     CTS(0); bp++;
 479     CTS(1); bp++;
 480     CTS(2); bp++;
 481     CTS(3); bp++;
 482     CTS(4); bp++;
 483     CTS(5); bp++;
 484     CTS(6); bp++;
 485     CTS(7);
 486
 487 #undef CTS
 488     /* }}} */
 489
 490 POWERPC_PERF_STOP_COUNT(altivec_fdct, 1);
 491 }
 492
 493 /* vim:set foldmethod=marker foldlevel=0: */