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fdct_altivec.c
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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_altivec.h"
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  { W0, W1, W2, W3 },
62  { W4, W5, W6, W7 },
63  { 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 ff_fdct_altivec(int16_t *block)
199 {
200  vector signed short *bp;
201  vector float *cp;
202  vector float b00, b10, b20, b30, b40, b50, b60, b70;
203  vector float b01, b11, b21, b31, b41, b51, b61, b71;
204  vector float mzero, cnst, cnsts0, cnsts1, cnsts2;
205  vector float x0, x1, x2, x3, x4, x5, x6, x7, x8;
206 
207  /* setup constants {{{ */
208  /* mzero = -0.0 */
209  mzero = ((vector float)vec_splat_u32(-1));
210  mzero = ((vector float)vec_sl(vu32(mzero), vu32(mzero)));
211  cp = fdctconsts;
212  cnsts0 = vec_ld(0, cp); cp++;
213  cnsts1 = vec_ld(0, cp); cp++;
214  cnsts2 = vec_ld(0, cp);
215  /* }}} */
216 
217 
218  /* 8x8 matrix transpose (vector short[8]) {{{ */
219 #define MERGE_S16(hl,a,b) vec_merge##hl(vs16(a), vs16(b))
220 
221  bp = (vector signed short*)block;
222  b00 = ((vector float)vec_ld(0, bp));
223  b40 = ((vector float)vec_ld(16*4, bp));
224  b01 = ((vector float)MERGE_S16(h, b00, b40));
225  b11 = ((vector float)MERGE_S16(l, b00, b40));
226  bp++;
227  b10 = ((vector float)vec_ld(0, bp));
228  b50 = ((vector float)vec_ld(16*4, bp));
229  b21 = ((vector float)MERGE_S16(h, b10, b50));
230  b31 = ((vector float)MERGE_S16(l, b10, b50));
231  bp++;
232  b20 = ((vector float)vec_ld(0, bp));
233  b60 = ((vector float)vec_ld(16*4, bp));
234  b41 = ((vector float)MERGE_S16(h, b20, b60));
235  b51 = ((vector float)MERGE_S16(l, b20, b60));
236  bp++;
237  b30 = ((vector float)vec_ld(0, bp));
238  b70 = ((vector float)vec_ld(16*4, bp));
239  b61 = ((vector float)MERGE_S16(h, b30, b70));
240  b71 = ((vector float)MERGE_S16(l, b30, b70));
241 
242  x0 = ((vector float)MERGE_S16(h, b01, b41));
243  x1 = ((vector float)MERGE_S16(l, b01, b41));
244  x2 = ((vector float)MERGE_S16(h, b11, b51));
245  x3 = ((vector float)MERGE_S16(l, b11, b51));
246  x4 = ((vector float)MERGE_S16(h, b21, b61));
247  x5 = ((vector float)MERGE_S16(l, b21, b61));
248  x6 = ((vector float)MERGE_S16(h, b31, b71));
249  x7 = ((vector float)MERGE_S16(l, b31, b71));
250 
251  b00 = ((vector float)MERGE_S16(h, x0, x4));
252  b10 = ((vector float)MERGE_S16(l, x0, x4));
253  b20 = ((vector float)MERGE_S16(h, x1, x5));
254  b30 = ((vector float)MERGE_S16(l, x1, x5));
255  b40 = ((vector float)MERGE_S16(h, x2, x6));
256  b50 = ((vector float)MERGE_S16(l, x2, x6));
257  b60 = ((vector float)MERGE_S16(h, x3, x7));
258  b70 = ((vector float)MERGE_S16(l, x3, x7));
259 
260 #undef MERGE_S16
261  /* }}} */
262 
263 
264 /* Some of the initial calculations can be done as vector short before
265  * conversion to vector float. The following code section takes advantage
266  * of this.
267  */
268  /* fdct rows {{{ */
269  x0 = ((vector float)vec_add(vs16(b00), vs16(b70)));
270  x7 = ((vector float)vec_sub(vs16(b00), vs16(b70)));
271  x1 = ((vector float)vec_add(vs16(b10), vs16(b60)));
272  x6 = ((vector float)vec_sub(vs16(b10), vs16(b60)));
273  x2 = ((vector float)vec_add(vs16(b20), vs16(b50)));
274  x5 = ((vector float)vec_sub(vs16(b20), vs16(b50)));
275  x3 = ((vector float)vec_add(vs16(b30), vs16(b40)));
276  x4 = ((vector float)vec_sub(vs16(b30), vs16(b40)));
277 
278  b70 = ((vector float)vec_add(vs16(x0), vs16(x3)));
279  b10 = ((vector float)vec_add(vs16(x1), vs16(x2)));
280 
281  b00 = ((vector float)vec_add(vs16(b70), vs16(b10)));
282  b40 = ((vector float)vec_sub(vs16(b70), vs16(b10)));
283 
284 #define CTF0(n) \
285  b##n##1 = ((vector float)vec_unpackl(vs16(b##n##0))); \
286  b##n##0 = ((vector float)vec_unpackh(vs16(b##n##0))); \
287  b##n##1 = vec_ctf(vs32(b##n##1), 0); \
288  b##n##0 = vec_ctf(vs32(b##n##0), 0);
289 
290  CTF0(0);
291  CTF0(4);
292 
293  b20 = ((vector float)vec_sub(vs16(x0), vs16(x3)));
294  b60 = ((vector float)vec_sub(vs16(x1), vs16(x2)));
295 
296  CTF0(2);
297  CTF0(6);
298 
299 #undef CTF0
300 
301  x0 = vec_add(b60, b20);
302  x1 = vec_add(b61, b21);
303 
304  cnst = LD_W2;
305  x0 = vec_madd(cnst, x0, mzero);
306  x1 = vec_madd(cnst, x1, mzero);
307  cnst = LD_W1;
308  b20 = vec_madd(cnst, b20, x0);
309  b21 = vec_madd(cnst, b21, x1);
310  cnst = LD_W0;
311  b60 = vec_madd(cnst, b60, x0);
312  b61 = vec_madd(cnst, b61, x1);
313 
314 #define CTFX(x,b) \
315  b##0 = ((vector float)vec_unpackh(vs16(x))); \
316  b##1 = ((vector float)vec_unpackl(vs16(x))); \
317  b##0 = vec_ctf(vs32(b##0), 0); \
318  b##1 = vec_ctf(vs32(b##1), 0); \
319 
320  CTFX(x4, b7);
321  CTFX(x5, b5);
322  CTFX(x6, b3);
323  CTFX(x7, b1);
324 
325 #undef CTFX
326 
327 
328  x0 = vec_add(b70, b10);
329  x1 = vec_add(b50, b30);
330  x2 = vec_add(b70, b30);
331  x3 = vec_add(b50, b10);
332  x8 = vec_add(x2, x3);
333  cnst = LD_W3;
334  x8 = vec_madd(cnst, x8, mzero);
335 
336  cnst = LD_W8;
337  x0 = vec_madd(cnst, x0, mzero);
338  cnst = LD_W9;
339  x1 = vec_madd(cnst, x1, mzero);
340  cnst = LD_WA;
341  x2 = vec_madd(cnst, x2, x8);
342  cnst = LD_WB;
343  x3 = vec_madd(cnst, x3, x8);
344 
345  cnst = LD_W4;
346  b70 = vec_madd(cnst, b70, x0);
347  cnst = LD_W5;
348  b50 = vec_madd(cnst, b50, x1);
349  cnst = LD_W6;
350  b30 = vec_madd(cnst, b30, x1);
351  cnst = LD_W7;
352  b10 = vec_madd(cnst, b10, x0);
353 
354  b70 = vec_add(b70, x2);
355  b50 = vec_add(b50, x3);
356  b30 = vec_add(b30, x2);
357  b10 = vec_add(b10, x3);
358 
359 
360  x0 = vec_add(b71, b11);
361  x1 = vec_add(b51, b31);
362  x2 = vec_add(b71, b31);
363  x3 = vec_add(b51, b11);
364  x8 = vec_add(x2, x3);
365  cnst = LD_W3;
366  x8 = vec_madd(cnst, x8, mzero);
367 
368  cnst = LD_W8;
369  x0 = vec_madd(cnst, x0, mzero);
370  cnst = LD_W9;
371  x1 = vec_madd(cnst, x1, mzero);
372  cnst = LD_WA;
373  x2 = vec_madd(cnst, x2, x8);
374  cnst = LD_WB;
375  x3 = vec_madd(cnst, x3, x8);
376 
377  cnst = LD_W4;
378  b71 = vec_madd(cnst, b71, x0);
379  cnst = LD_W5;
380  b51 = vec_madd(cnst, b51, x1);
381  cnst = LD_W6;
382  b31 = vec_madd(cnst, b31, x1);
383  cnst = LD_W7;
384  b11 = vec_madd(cnst, b11, x0);
385 
386  b71 = vec_add(b71, x2);
387  b51 = vec_add(b51, x3);
388  b31 = vec_add(b31, x2);
389  b11 = vec_add(b11, x3);
390  /* }}} */
391 
392 
393  /* 8x8 matrix transpose (vector float[8][2]) {{{ */
394  x0 = vec_mergel(b00, b20);
395  x1 = vec_mergeh(b00, b20);
396  x2 = vec_mergel(b10, b30);
397  x3 = vec_mergeh(b10, b30);
398 
399  b00 = vec_mergeh(x1, x3);
400  b10 = vec_mergel(x1, x3);
401  b20 = vec_mergeh(x0, x2);
402  b30 = vec_mergel(x0, x2);
403 
404  x4 = vec_mergel(b41, b61);
405  x5 = vec_mergeh(b41, b61);
406  x6 = vec_mergel(b51, b71);
407  x7 = vec_mergeh(b51, b71);
408 
409  b41 = vec_mergeh(x5, x7);
410  b51 = vec_mergel(x5, x7);
411  b61 = vec_mergeh(x4, x6);
412  b71 = vec_mergel(x4, x6);
413 
414  x0 = vec_mergel(b01, b21);
415  x1 = vec_mergeh(b01, b21);
416  x2 = vec_mergel(b11, b31);
417  x3 = vec_mergeh(b11, b31);
418 
419  x4 = vec_mergel(b40, b60);
420  x5 = vec_mergeh(b40, b60);
421  x6 = vec_mergel(b50, b70);
422  x7 = vec_mergeh(b50, b70);
423 
424  b40 = vec_mergeh(x1, x3);
425  b50 = vec_mergel(x1, x3);
426  b60 = vec_mergeh(x0, x2);
427  b70 = vec_mergel(x0, x2);
428 
429  b01 = vec_mergeh(x5, x7);
430  b11 = vec_mergel(x5, x7);
431  b21 = vec_mergeh(x4, x6);
432  b31 = vec_mergel(x4, x6);
433  /* }}} */
434 
435 
436  FDCTCOL(b00, b10, b20, b30, b40, b50, b60, b70);
437  FDCTCOL(b01, b11, b21, b31, b41, b51, b61, b71);
438 
439 
440  /* round, convert back to short {{{ */
441 #define CTS(n) \
442  b##n##0 = vec_round(b##n##0); \
443  b##n##1 = vec_round(b##n##1); \
444  b##n##0 = ((vector float)vec_cts(b##n##0, 0)); \
445  b##n##1 = ((vector float)vec_cts(b##n##1, 0)); \
446  b##n##0 = ((vector float)vec_pack(vs32(b##n##0), vs32(b##n##1))); \
447  vec_st(vs16(b##n##0), 0, bp);
448 
449  bp = (vector signed short*)block;
450  CTS(0); bp++;
451  CTS(1); bp++;
452  CTS(2); bp++;
453  CTS(3); bp++;
454  CTS(4); bp++;
455  CTS(5); bp++;
456  CTS(6); bp++;
457  CTS(7);
458 
459 #undef CTS
460  /* }}} */
461 }
462 
463 /* vim:set foldmethod=marker foldlevel=0: */
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