Statistics
| Branch: | Revision:

ffmpeg / libavcodec / ppc / fdct_altivec.c @ 5137235e

History | View | Annotate | Download (18 KB)

1
/*
2
 * Copyright (C) 2003  James Klicman <james@klicman.org>
3
 *
4
 * This file is part of FFmpeg.
5
 *
6
 * FFmpeg 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
 * FFmpeg 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 FFmpeg; 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 "libavcodec/dsputil.h"
27
#include "dsputil_ppc.h"
28

    
29

    
30
#define vs16(v) ((vector signed short)(v))
31
#define vs32(v) ((vector signed int)(v))
32
#define vu8(v)  ((vector unsigned char)(v))
33
#define vu16(v) ((vector unsigned short)(v))
34
#define vu32(v) ((vector unsigned int)(v))
35

    
36

    
37
#define C1     0.98078525066375732421875000 /* cos(1*PI/16) */
38
#define C2     0.92387950420379638671875000 /* cos(2*PI/16) */
39
#define C3     0.83146959543228149414062500 /* cos(3*PI/16) */
40
#define C4     0.70710676908493041992187500 /* cos(4*PI/16) */
41
#define C5     0.55557024478912353515625000 /* cos(5*PI/16) */
42
#define C6     0.38268342614173889160156250 /* cos(6*PI/16) */
43
#define C7     0.19509032368659973144531250 /* cos(7*PI/16) */
44
#define SQRT_2 1.41421353816986083984375000 /* sqrt(2)      */
45

    
46

    
47
#define W0 -(2 * C2)
48
#define W1 (2 * C6)
49
#define W2 (SQRT_2 * C6)
50
#define W3 (SQRT_2 * C3)
51
#define W4 (SQRT_2 * (-C1 + C3 + C5 - C7))
52
#define W5 (SQRT_2 * ( C1 + C3 - C5 + C7))
53
#define W6 (SQRT_2 * ( C1 + C3 + C5 - C7))
54
#define W7 (SQRT_2 * ( C1 + C3 - C5 - C7))
55
#define W8 (SQRT_2 * ( C7 - C3))
56
#define W9 (SQRT_2 * (-C1 - C3))
57
#define WA (SQRT_2 * (-C3 - C5))
58
#define WB (SQRT_2 * ( C5 - C3))
59

    
60

    
61
static vector float fdctconsts[3] = {
62
    { W0, W1, W2, W3 },
63
    { W4, W5, W6, W7 },
64
    { W8, W9, WA, WB }
65
};
66

    
67
#define LD_W0 vec_splat(cnsts0, 0)
68
#define LD_W1 vec_splat(cnsts0, 1)
69
#define LD_W2 vec_splat(cnsts0, 2)
70
#define LD_W3 vec_splat(cnsts0, 3)
71
#define LD_W4 vec_splat(cnsts1, 0)
72
#define LD_W5 vec_splat(cnsts1, 1)
73
#define LD_W6 vec_splat(cnsts1, 2)
74
#define LD_W7 vec_splat(cnsts1, 3)
75
#define LD_W8 vec_splat(cnsts2, 0)
76
#define LD_W9 vec_splat(cnsts2, 1)
77
#define LD_WA vec_splat(cnsts2, 2)
78
#define LD_WB vec_splat(cnsts2, 3)
79

    
80

    
81
#define FDCTROW(b0,b1,b2,b3,b4,b5,b6,b7) /* {{{ */                  \
82
    x0 = vec_add(b0, b7);               /* x0 = b0 + b7; */         \
83
    x7 = vec_sub(b0, b7);               /* x7 = b0 - b7; */         \
84
    x1 = vec_add(b1, b6);               /* x1 = b1 + b6; */         \
85
    x6 = vec_sub(b1, b6);               /* x6 = b1 - b6; */         \
86
    x2 = vec_add(b2, b5);               /* x2 = b2 + b5; */         \
87
    x5 = vec_sub(b2, b5);               /* x5 = b2 - b5; */         \
88
    x3 = vec_add(b3, b4);               /* x3 = b3 + b4; */         \
89
    x4 = vec_sub(b3, b4);               /* x4 = b3 - b4; */         \
90
                                                                    \
91
    b7 = vec_add(x0, x3);               /* b7 = x0 + x3; */         \
92
    b1 = vec_add(x1, x2);               /* b1 = x1 + x2; */         \
93
    b0 = vec_add(b7, b1);               /* b0 = b7 + b1; */         \
94
    b4 = vec_sub(b7, b1);               /* b4 = b7 - b1; */         \
95
                                                                    \
96
    b2 = vec_sub(x0, x3);               /* b2 = x0 - x3; */         \
97
    b6 = vec_sub(x1, x2);               /* b6 = x1 - x2; */         \
98
    b5 = vec_add(b6, b2);               /* b5 = b6 + b2; */         \
99
    cnst = LD_W2;                                                   \
100
    b5 = vec_madd(cnst, b5, mzero);     /* b5 = b5 * W2; */         \
101
    cnst = LD_W1;                                                   \
102
    b2 = vec_madd(cnst, b2, b5);        /* b2 = b5 + b2 * W1; */    \
103
    cnst = LD_W0;                                                   \
104
    b6 = vec_madd(cnst, b6, b5);        /* b6 = b5 + b6 * W0; */    \
105
                                                                    \
106
    x0 = vec_add(x4, x7);               /* x0 = x4 + x7; */         \
107
    x1 = vec_add(x5, x6);               /* x1 = x5 + x6; */         \
108
    x2 = vec_add(x4, x6);               /* x2 = x4 + x6; */         \
109
    x3 = vec_add(x5, x7);               /* x3 = x5 + x7; */         \
110
    x8 = vec_add(x2, x3);               /* x8 = x2 + x3; */         \
111
    cnst = LD_W3;                                                   \
112
    x8 = vec_madd(cnst, x8, mzero);     /* x8 = x8 * W3; */         \
113
                                                                    \
114
    cnst = LD_W8;                                                   \
115
    x0 = vec_madd(cnst, x0, mzero);     /* x0 *= W8; */             \
116
    cnst = LD_W9;                                                   \
117
    x1 = vec_madd(cnst, x1, mzero);     /* x1 *= W9; */             \
118
    cnst = LD_WA;                                                   \
119
    x2 = vec_madd(cnst, x2, x8);        /* x2 = x2 * WA + x8; */    \
120
    cnst = LD_WB;                                                   \
121
    x3 = vec_madd(cnst, x3, x8);        /* x3 = x3 * WB + x8; */    \
122
                                                                    \
123
    cnst = LD_W4;                                                   \
124
    b7 = vec_madd(cnst, x4, x0);        /* b7 = x4 * W4 + x0; */    \
125
    cnst = LD_W5;                                                   \
126
    b5 = vec_madd(cnst, x5, x1);        /* b5 = x5 * W5 + x1; */    \
127
    cnst = LD_W6;                                                   \
128
    b3 = vec_madd(cnst, x6, x1);        /* b3 = x6 * W6 + x1; */    \
129
    cnst = LD_W7;                                                   \
130
    b1 = vec_madd(cnst, x7, x0);        /* b1 = x7 * W7 + x0; */    \
131
                                                                    \
132
    b7 = vec_add(b7, x2);               /* b7 = b7 + x2; */         \
133
    b5 = vec_add(b5, x3);               /* b5 = b5 + x3; */         \
134
    b3 = vec_add(b3, x2);               /* b3 = b3 + x2; */         \
135
    b1 = vec_add(b1, x3);               /* b1 = b1 + x3; */         \
136
    /* }}} */
137

    
138
#define FDCTCOL(b0,b1,b2,b3,b4,b5,b6,b7) /* {{{ */                  \
139
    x0 = vec_add(b0, b7);               /* x0 = b0 + b7; */         \
140
    x7 = vec_sub(b0, b7);               /* x7 = b0 - b7; */         \
141
    x1 = vec_add(b1, b6);               /* x1 = b1 + b6; */         \
142
    x6 = vec_sub(b1, b6);               /* x6 = b1 - b6; */         \
143
    x2 = vec_add(b2, b5);               /* x2 = b2 + b5; */         \
144
    x5 = vec_sub(b2, b5);               /* x5 = b2 - b5; */         \
145
    x3 = vec_add(b3, b4);               /* x3 = b3 + b4; */         \
146
    x4 = vec_sub(b3, b4);               /* x4 = b3 - b4; */         \
147
                                                                    \
148
    b7 = vec_add(x0, x3);               /* b7 = x0 + x3; */         \
149
    b1 = vec_add(x1, x2);               /* b1 = x1 + x2; */         \
150
    b0 = vec_add(b7, b1);               /* b0 = b7 + b1; */         \
151
    b4 = vec_sub(b7, b1);               /* b4 = b7 - b1; */         \
152
                                                                    \
153
    b2 = vec_sub(x0, x3);               /* b2 = x0 - x3; */         \
154
    b6 = vec_sub(x1, x2);               /* b6 = x1 - x2; */         \
155
    b5 = vec_add(b6, b2);               /* b5 = b6 + b2; */         \
156
    cnst = LD_W2;                                                   \
157
    b5 = vec_madd(cnst, b5, mzero);     /* b5 = b5 * W2; */         \
158
    cnst = LD_W1;                                                   \
159
    b2 = vec_madd(cnst, b2, b5);        /* b2 = b5 + b2 * W1; */    \
160
    cnst = LD_W0;                                                   \
161
    b6 = vec_madd(cnst, b6, b5);        /* b6 = b5 + b6 * W0; */    \
162
                                                                    \
163
    x0 = vec_add(x4, x7);               /* x0 = x4 + x7; */         \
164
    x1 = vec_add(x5, x6);               /* x1 = x5 + x6; */         \
165
    x2 = vec_add(x4, x6);               /* x2 = x4 + x6; */         \
166
    x3 = vec_add(x5, x7);               /* x3 = x5 + x7; */         \
167
    x8 = vec_add(x2, x3);               /* x8 = x2 + x3; */         \
168
    cnst = LD_W3;                                                   \
169
    x8 = vec_madd(cnst, x8, mzero);     /* x8 = x8 * W3; */         \
170
                                                                    \
171
    cnst = LD_W8;                                                   \
172
    x0 = vec_madd(cnst, x0, mzero);     /* x0 *= W8; */             \
173
    cnst = LD_W9;                                                   \
174
    x1 = vec_madd(cnst, x1, mzero);     /* x1 *= W9; */             \
175
    cnst = LD_WA;                                                   \
176
    x2 = vec_madd(cnst, x2, x8);        /* x2 = x2 * WA + x8; */    \
177
    cnst = LD_WB;                                                   \
178
    x3 = vec_madd(cnst, x3, x8);        /* x3 = x3 * WB + x8; */    \
179
                                                                    \
180
    cnst = LD_W4;                                                   \
181
    b7 = vec_madd(cnst, x4, x0);        /* b7 = x4 * W4 + x0; */    \
182
    cnst = LD_W5;                                                   \
183
    b5 = vec_madd(cnst, x5, x1);        /* b5 = x5 * W5 + x1; */    \
184
    cnst = LD_W6;                                                   \
185
    b3 = vec_madd(cnst, x6, x1);        /* b3 = x6 * W6 + x1; */    \
186
    cnst = LD_W7;                                                   \
187
    b1 = vec_madd(cnst, x7, x0);        /* b1 = x7 * W7 + x0; */    \
188
                                                                    \
189
    b7 = vec_add(b7, x2);               /* b7 += x2; */             \
190
    b5 = vec_add(b5, x3);               /* b5 += x3; */             \
191
    b3 = vec_add(b3, x2);               /* b3 += x2; */             \
192
    b1 = vec_add(b1, x3);               /* b1 += x3; */             \
193
    /* }}} */
194

    
195

    
196

    
197
/* two dimensional discrete cosine transform */
198

    
199
void fdct_altivec(int16_t *block)
200
{
201
POWERPC_PERF_DECLARE(altivec_fdct, 1);
202
    vector signed short *bp;
203
    vector float *cp;
204
    vector float b00, b10, b20, b30, b40, b50, b60, b70;
205
    vector float b01, b11, b21, b31, b41, b51, b61, b71;
206
    vector float mzero, cnst, cnsts0, cnsts1, cnsts2;
207
    vector float x0, x1, x2, x3, x4, x5, x6, x7, x8;
208

    
209
    POWERPC_PERF_START_COUNT(altivec_fdct, 1);
210

    
211

    
212
    /* setup constants {{{ */
213
    /* mzero = -0.0 */
214
    mzero = ((vector float)vec_splat_u32(-1));
215
    mzero = ((vector float)vec_sl(vu32(mzero), vu32(mzero)));
216
    cp = fdctconsts;
217
    cnsts0 = vec_ld(0, cp); cp++;
218
    cnsts1 = vec_ld(0, cp); cp++;
219
    cnsts2 = vec_ld(0, cp);
220
    /* }}} */
221

    
222

    
223
    /* 8x8 matrix transpose (vector short[8]) {{{ */
224
#define MERGE_S16(hl,a,b) vec_merge##hl(vs16(a), vs16(b))
225

    
226
    bp = (vector signed short*)block;
227
    b00 = ((vector float)vec_ld(0,    bp));
228
    b40 = ((vector float)vec_ld(16*4, bp));
229
    b01 = ((vector float)MERGE_S16(h, b00, b40));
230
    b11 = ((vector float)MERGE_S16(l, b00, b40));
231
    bp++;
232
    b10 = ((vector float)vec_ld(0,    bp));
233
    b50 = ((vector float)vec_ld(16*4, bp));
234
    b21 = ((vector float)MERGE_S16(h, b10, b50));
235
    b31 = ((vector float)MERGE_S16(l, b10, b50));
236
    bp++;
237
    b20 = ((vector float)vec_ld(0,    bp));
238
    b60 = ((vector float)vec_ld(16*4, bp));
239
    b41 = ((vector float)MERGE_S16(h, b20, b60));
240
    b51 = ((vector float)MERGE_S16(l, b20, b60));
241
    bp++;
242
    b30 = ((vector float)vec_ld(0,    bp));
243
    b70 = ((vector float)vec_ld(16*4, bp));
244
    b61 = ((vector float)MERGE_S16(h, b30, b70));
245
    b71 = ((vector float)MERGE_S16(l, b30, b70));
246

    
247
    x0 = ((vector float)MERGE_S16(h, b01, b41));
248
    x1 = ((vector float)MERGE_S16(l, b01, b41));
249
    x2 = ((vector float)MERGE_S16(h, b11, b51));
250
    x3 = ((vector float)MERGE_S16(l, b11, b51));
251
    x4 = ((vector float)MERGE_S16(h, b21, b61));
252
    x5 = ((vector float)MERGE_S16(l, b21, b61));
253
    x6 = ((vector float)MERGE_S16(h, b31, b71));
254
    x7 = ((vector float)MERGE_S16(l, b31, b71));
255

    
256
    b00 = ((vector float)MERGE_S16(h, x0, x4));
257
    b10 = ((vector float)MERGE_S16(l, x0, x4));
258
    b20 = ((vector float)MERGE_S16(h, x1, x5));
259
    b30 = ((vector float)MERGE_S16(l, x1, x5));
260
    b40 = ((vector float)MERGE_S16(h, x2, x6));
261
    b50 = ((vector float)MERGE_S16(l, x2, x6));
262
    b60 = ((vector float)MERGE_S16(h, x3, x7));
263
    b70 = ((vector float)MERGE_S16(l, x3, x7));
264

    
265
#undef MERGE_S16
266
    /* }}} */
267

    
268

    
269
/* Some of the initial calculations can be done as vector short before
270
 * conversion to vector float.  The following code section takes advantage
271
 * of this.
272
 */
273
#if 1
274
    /* fdct rows {{{ */
275
    x0 = ((vector float)vec_add(vs16(b00), vs16(b70)));
276
    x7 = ((vector float)vec_sub(vs16(b00), vs16(b70)));
277
    x1 = ((vector float)vec_add(vs16(b10), vs16(b60)));
278
    x6 = ((vector float)vec_sub(vs16(b10), vs16(b60)));
279
    x2 = ((vector float)vec_add(vs16(b20), vs16(b50)));
280
    x5 = ((vector float)vec_sub(vs16(b20), vs16(b50)));
281
    x3 = ((vector float)vec_add(vs16(b30), vs16(b40)));
282
    x4 = ((vector float)vec_sub(vs16(b30), vs16(b40)));
283

    
284
    b70 = ((vector float)vec_add(vs16(x0), vs16(x3)));
285
    b10 = ((vector float)vec_add(vs16(x1), vs16(x2)));
286

    
287
    b00 = ((vector float)vec_add(vs16(b70), vs16(b10)));
288
    b40 = ((vector float)vec_sub(vs16(b70), vs16(b10)));
289

    
290
#define CTF0(n) \
291
    b##n##1 = ((vector float)vec_unpackl(vs16(b##n##0))); \
292
    b##n##0 = ((vector float)vec_unpackh(vs16(b##n##0))); \
293
    b##n##1 = vec_ctf(vs32(b##n##1), 0); \
294
    b##n##0 = vec_ctf(vs32(b##n##0), 0);
295

    
296
    CTF0(0);
297
    CTF0(4);
298

    
299
    b20 = ((vector float)vec_sub(vs16(x0), vs16(x3)));
300
    b60 = ((vector float)vec_sub(vs16(x1), vs16(x2)));
301

    
302
    CTF0(2);
303
    CTF0(6);
304

    
305
#undef CTF0
306

    
307
    x0 = vec_add(b60, b20);
308
    x1 = vec_add(b61, b21);
309

    
310
    cnst = LD_W2;
311
    x0 = vec_madd(cnst, x0, mzero);
312
    x1 = vec_madd(cnst, x1, mzero);
313
    cnst = LD_W1;
314
    b20 = vec_madd(cnst, b20, x0);
315
    b21 = vec_madd(cnst, b21, x1);
316
    cnst = LD_W0;
317
    b60 = vec_madd(cnst, b60, x0);
318
    b61 = vec_madd(cnst, b61, x1);
319

    
320
#define CTFX(x,b) \
321
    b##0 = ((vector float)vec_unpackh(vs16(x))); \
322
    b##1 = ((vector float)vec_unpackl(vs16(x))); \
323
    b##0 = vec_ctf(vs32(b##0), 0); \
324
    b##1 = vec_ctf(vs32(b##1), 0); \
325

    
326
    CTFX(x4, b7);
327
    CTFX(x5, b5);
328
    CTFX(x6, b3);
329
    CTFX(x7, b1);
330

    
331
#undef CTFX
332

    
333

    
334
    x0 = vec_add(b70, b10);
335
    x1 = vec_add(b50, b30);
336
    x2 = vec_add(b70, b30);
337
    x3 = vec_add(b50, b10);
338
    x8 = vec_add(x2, x3);
339
    cnst = LD_W3;
340
    x8 = vec_madd(cnst, x8, mzero);
341

    
342
    cnst = LD_W8;
343
    x0 = vec_madd(cnst, x0, mzero);
344
    cnst = LD_W9;
345
    x1 = vec_madd(cnst, x1, mzero);
346
    cnst = LD_WA;
347
    x2 = vec_madd(cnst, x2, x8);
348
    cnst = LD_WB;
349
    x3 = vec_madd(cnst, x3, x8);
350

    
351
    cnst = LD_W4;
352
    b70 = vec_madd(cnst, b70, x0);
353
    cnst = LD_W5;
354
    b50 = vec_madd(cnst, b50, x1);
355
    cnst = LD_W6;
356
    b30 = vec_madd(cnst, b30, x1);
357
    cnst = LD_W7;
358
    b10 = vec_madd(cnst, b10, x0);
359

    
360
    b70 = vec_add(b70, x2);
361
    b50 = vec_add(b50, x3);
362
    b30 = vec_add(b30, x2);
363
    b10 = vec_add(b10, x3);
364

    
365

    
366
    x0 = vec_add(b71, b11);
367
    x1 = vec_add(b51, b31);
368
    x2 = vec_add(b71, b31);
369
    x3 = vec_add(b51, b11);
370
    x8 = vec_add(x2, x3);
371
    cnst = LD_W3;
372
    x8 = vec_madd(cnst, x8, mzero);
373

    
374
    cnst = LD_W8;
375
    x0 = vec_madd(cnst, x0, mzero);
376
    cnst = LD_W9;
377
    x1 = vec_madd(cnst, x1, mzero);
378
    cnst = LD_WA;
379
    x2 = vec_madd(cnst, x2, x8);
380
    cnst = LD_WB;
381
    x3 = vec_madd(cnst, x3, x8);
382

    
383
    cnst = LD_W4;
384
    b71 = vec_madd(cnst, b71, x0);
385
    cnst = LD_W5;
386
    b51 = vec_madd(cnst, b51, x1);
387
    cnst = LD_W6;
388
    b31 = vec_madd(cnst, b31, x1);
389
    cnst = LD_W7;
390
    b11 = vec_madd(cnst, b11, x0);
391

    
392
    b71 = vec_add(b71, x2);
393
    b51 = vec_add(b51, x3);
394
    b31 = vec_add(b31, x2);
395
    b11 = vec_add(b11, x3);
396
    /* }}} */
397
#else
398
    /* convert to float {{{ */
399
#define CTF(n) \
400
    vs32(b##n##1) = vec_unpackl(vs16(b##n##0)); \
401
    vs32(b##n##0) = vec_unpackh(vs16(b##n##0)); \
402
    b##n##1 = vec_ctf(vs32(b##n##1), 0); \
403
    b##n##0 = vec_ctf(vs32(b##n##0), 0); \
404

    
405
    CTF(0);
406
    CTF(1);
407
    CTF(2);
408
    CTF(3);
409
    CTF(4);
410
    CTF(5);
411
    CTF(6);
412
    CTF(7);
413

    
414
#undef CTF
415
    /* }}} */
416

    
417
    FDCTROW(b00, b10, b20, b30, b40, b50, b60, b70);
418
    FDCTROW(b01, b11, b21, b31, b41, b51, b61, b71);
419
#endif
420

    
421

    
422
    /* 8x8 matrix transpose (vector float[8][2]) {{{ */
423
    x0 = vec_mergel(b00, b20);
424
    x1 = vec_mergeh(b00, b20);
425
    x2 = vec_mergel(b10, b30);
426
    x3 = vec_mergeh(b10, b30);
427

    
428
    b00 = vec_mergeh(x1, x3);
429
    b10 = vec_mergel(x1, x3);
430
    b20 = vec_mergeh(x0, x2);
431
    b30 = vec_mergel(x0, x2);
432

    
433
    x4 = vec_mergel(b41, b61);
434
    x5 = vec_mergeh(b41, b61);
435
    x6 = vec_mergel(b51, b71);
436
    x7 = vec_mergeh(b51, b71);
437

    
438
    b41 = vec_mergeh(x5, x7);
439
    b51 = vec_mergel(x5, x7);
440
    b61 = vec_mergeh(x4, x6);
441
    b71 = vec_mergel(x4, x6);
442

    
443
    x0 = vec_mergel(b01, b21);
444
    x1 = vec_mergeh(b01, b21);
445
    x2 = vec_mergel(b11, b31);
446
    x3 = vec_mergeh(b11, b31);
447

    
448
    x4 = vec_mergel(b40, b60);
449
    x5 = vec_mergeh(b40, b60);
450
    x6 = vec_mergel(b50, b70);
451
    x7 = vec_mergeh(b50, b70);
452

    
453
    b40 = vec_mergeh(x1, x3);
454
    b50 = vec_mergel(x1, x3);
455
    b60 = vec_mergeh(x0, x2);
456
    b70 = vec_mergel(x0, x2);
457

    
458
    b01 = vec_mergeh(x5, x7);
459
    b11 = vec_mergel(x5, x7);
460
    b21 = vec_mergeh(x4, x6);
461
    b31 = vec_mergel(x4, x6);
462
    /* }}} */
463

    
464

    
465
    FDCTCOL(b00, b10, b20, b30, b40, b50, b60, b70);
466
    FDCTCOL(b01, b11, b21, b31, b41, b51, b61, b71);
467

    
468

    
469
    /* round, convert back to short {{{ */
470
#define CTS(n) \
471
    b##n##0 = vec_round(b##n##0); \
472
    b##n##1 = vec_round(b##n##1); \
473
    b##n##0 = ((vector float)vec_cts(b##n##0, 0)); \
474
    b##n##1 = ((vector float)vec_cts(b##n##1, 0)); \
475
    b##n##0 = ((vector float)vec_pack(vs32(b##n##0), vs32(b##n##1))); \
476
    vec_st(vs16(b##n##0), 0, bp);
477

    
478
    bp = (vector signed short*)block;
479
    CTS(0); bp++;
480
    CTS(1); bp++;
481
    CTS(2); bp++;
482
    CTS(3); bp++;
483
    CTS(4); bp++;
484
    CTS(5); bp++;
485
    CTS(6); bp++;
486
    CTS(7);
487

    
488
#undef CTS
489
    /* }}} */
490

    
491
POWERPC_PERF_STOP_COUNT(altivec_fdct, 1);
492
}
493

    
494
/* vim:set foldmethod=marker foldlevel=0: */