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dsputil_altivec.c
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1 /*
2  * Copyright (c) 2002 Brian Foley
3  * Copyright (c) 2002 Dieter Shirley
4  * Copyright (c) 2003-2004 Romain Dolbeau <romain@dolbeau.org>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "config.h"
24 #if HAVE_ALTIVEC_H
25 #include <altivec.h>
26 #endif
27 #include "libavutil/attributes.h"
28 #include "libavutil/ppc/types_altivec.h"
29 #include "libavutil/ppc/util_altivec.h"
30 #include "libavcodec/dsputil.h"
31 #include "dsputil_altivec.h"
32 
33 static int sad16_x2_altivec(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
34 {
35  int i;
36  int s;
37  const vector unsigned char zero = (const vector unsigned char)vec_splat_u8(0);
38  vector unsigned char perm1 = vec_lvsl(0, pix2);
39  vector unsigned char perm2 = vec_add(perm1, vec_splat_u8(1));
40  vector unsigned char pix2l, pix2r;
41  vector unsigned char pix1v, pix2v, pix2iv, avgv, t5;
42  vector unsigned int sad;
43  vector signed int sumdiffs;
44 
45  s = 0;
46  sad = (vector unsigned int)vec_splat_u32(0);
47  for (i = 0; i < h; i++) {
48  /* Read unaligned pixels into our vectors. The vectors are as follows:
49  pix1v: pix1[0]-pix1[15]
50  pix2v: pix2[0]-pix2[15] pix2iv: pix2[1]-pix2[16] */
51  pix1v = vec_ld( 0, pix1);
52  pix2l = vec_ld( 0, pix2);
53  pix2r = vec_ld(16, pix2);
54  pix2v = vec_perm(pix2l, pix2r, perm1);
55  pix2iv = vec_perm(pix2l, pix2r, perm2);
56 
57  /* Calculate the average vector */
58  avgv = vec_avg(pix2v, pix2iv);
59 
60  /* Calculate a sum of abs differences vector */
61  t5 = vec_sub(vec_max(pix1v, avgv), vec_min(pix1v, avgv));
62 
63  /* Add each 4 pixel group together and put 4 results into sad */
64  sad = vec_sum4s(t5, sad);
65 
66  pix1 += line_size;
67  pix2 += line_size;
68  }
69  /* Sum up the four partial sums, and put the result into s */
70  sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);
71  sumdiffs = vec_splat(sumdiffs, 3);
72  vec_ste(sumdiffs, 0, &s);
73 
74  return s;
75 }
76 
77 static int sad16_y2_altivec(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
78 {
79  int i;
80  int s;
81  const vector unsigned char zero = (const vector unsigned char)vec_splat_u8(0);
82  vector unsigned char perm = vec_lvsl(0, pix2);
83  vector unsigned char pix2l, pix2r;
84  vector unsigned char pix1v, pix2v, pix3v, avgv, t5;
85  vector unsigned int sad;
86  vector signed int sumdiffs;
87  uint8_t *pix3 = pix2 + line_size;
88 
89  s = 0;
90  sad = (vector unsigned int)vec_splat_u32(0);
91 
92  /* Due to the fact that pix3 = pix2 + line_size, the pix3 of one
93  iteration becomes pix2 in the next iteration. We can use this
94  fact to avoid a potentially expensive unaligned read, each
95  time around the loop.
96  Read unaligned pixels into our vectors. The vectors are as follows:
97  pix2v: pix2[0]-pix2[15]
98  Split the pixel vectors into shorts */
99  pix2l = vec_ld( 0, pix2);
100  pix2r = vec_ld(15, pix2);
101  pix2v = vec_perm(pix2l, pix2r, perm);
102 
103  for (i = 0; i < h; i++) {
104  /* Read unaligned pixels into our vectors. The vectors are as follows:
105  pix1v: pix1[0]-pix1[15]
106  pix3v: pix3[0]-pix3[15] */
107  pix1v = vec_ld(0, pix1);
108 
109  pix2l = vec_ld( 0, pix3);
110  pix2r = vec_ld(15, pix3);
111  pix3v = vec_perm(pix2l, pix2r, perm);
112 
113  /* Calculate the average vector */
114  avgv = vec_avg(pix2v, pix3v);
115 
116  /* Calculate a sum of abs differences vector */
117  t5 = vec_sub(vec_max(pix1v, avgv), vec_min(pix1v, avgv));
118 
119  /* Add each 4 pixel group together and put 4 results into sad */
120  sad = vec_sum4s(t5, sad);
121 
122  pix1 += line_size;
123  pix2v = pix3v;
124  pix3 += line_size;
125 
126  }
127 
128  /* Sum up the four partial sums, and put the result into s */
129  sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);
130  sumdiffs = vec_splat(sumdiffs, 3);
131  vec_ste(sumdiffs, 0, &s);
132  return s;
133 }
134 
135 static int sad16_xy2_altivec(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
136 {
137  int i;
138  int s;
139  uint8_t *pix3 = pix2 + line_size;
140  const vector unsigned char zero = (const vector unsigned char)vec_splat_u8(0);
141  const vector unsigned short two = (const vector unsigned short)vec_splat_u16(2);
142  vector unsigned char avgv, t5;
143  vector unsigned char perm1 = vec_lvsl(0, pix2);
144  vector unsigned char perm2 = vec_add(perm1, vec_splat_u8(1));
145  vector unsigned char pix2l, pix2r;
146  vector unsigned char pix1v, pix2v, pix3v, pix2iv, pix3iv;
147  vector unsigned short pix2lv, pix2hv, pix2ilv, pix2ihv;
148  vector unsigned short pix3lv, pix3hv, pix3ilv, pix3ihv;
149  vector unsigned short avghv, avglv;
150  vector unsigned short t1, t2, t3, t4;
151  vector unsigned int sad;
152  vector signed int sumdiffs;
153 
154  sad = (vector unsigned int)vec_splat_u32(0);
155 
156  s = 0;
157 
158  /* Due to the fact that pix3 = pix2 + line_size, the pix3 of one
159  iteration becomes pix2 in the next iteration. We can use this
160  fact to avoid a potentially expensive unaligned read, as well
161  as some splitting, and vector addition each time around the loop.
162  Read unaligned pixels into our vectors. The vectors are as follows:
163  pix2v: pix2[0]-pix2[15] pix2iv: pix2[1]-pix2[16]
164  Split the pixel vectors into shorts */
165  pix2l = vec_ld( 0, pix2);
166  pix2r = vec_ld(16, pix2);
167  pix2v = vec_perm(pix2l, pix2r, perm1);
168  pix2iv = vec_perm(pix2l, pix2r, perm2);
169 
170  pix2hv = (vector unsigned short) vec_mergeh(zero, pix2v);
171  pix2lv = (vector unsigned short) vec_mergel(zero, pix2v);
172  pix2ihv = (vector unsigned short) vec_mergeh(zero, pix2iv);
173  pix2ilv = (vector unsigned short) vec_mergel(zero, pix2iv);
174  t1 = vec_add(pix2hv, pix2ihv);
175  t2 = vec_add(pix2lv, pix2ilv);
176 
177  for (i = 0; i < h; i++) {
178  /* Read unaligned pixels into our vectors. The vectors are as follows:
179  pix1v: pix1[0]-pix1[15]
180  pix3v: pix3[0]-pix3[15] pix3iv: pix3[1]-pix3[16] */
181  pix1v = vec_ld(0, pix1);
182 
183  pix2l = vec_ld( 0, pix3);
184  pix2r = vec_ld(16, pix3);
185  pix3v = vec_perm(pix2l, pix2r, perm1);
186  pix3iv = vec_perm(pix2l, pix2r, perm2);
187 
188  /* Note that AltiVec does have vec_avg, but this works on vector pairs
189  and rounds up. We could do avg(avg(a,b),avg(c,d)), but the rounding
190  would mean that, for example, avg(3,0,0,1) = 2, when it should be 1.
191  Instead, we have to split the pixel vectors into vectors of shorts,
192  and do the averaging by hand. */
193 
194  /* Split the pixel vectors into shorts */
195  pix3hv = (vector unsigned short) vec_mergeh(zero, pix3v);
196  pix3lv = (vector unsigned short) vec_mergel(zero, pix3v);
197  pix3ihv = (vector unsigned short) vec_mergeh(zero, pix3iv);
198  pix3ilv = (vector unsigned short) vec_mergel(zero, pix3iv);
199 
200  /* Do the averaging on them */
201  t3 = vec_add(pix3hv, pix3ihv);
202  t4 = vec_add(pix3lv, pix3ilv);
203 
204  avghv = vec_sr(vec_add(vec_add(t1, t3), two), two);
205  avglv = vec_sr(vec_add(vec_add(t2, t4), two), two);
206 
207  /* Pack the shorts back into a result */
208  avgv = vec_pack(avghv, avglv);
209 
210  /* Calculate a sum of abs differences vector */
211  t5 = vec_sub(vec_max(pix1v, avgv), vec_min(pix1v, avgv));
212 
213  /* Add each 4 pixel group together and put 4 results into sad */
214  sad = vec_sum4s(t5, sad);
215 
216  pix1 += line_size;
217  pix3 += line_size;
218  /* Transfer the calculated values for pix3 into pix2 */
219  t1 = t3;
220  t2 = t4;
221  }
222  /* Sum up the four partial sums, and put the result into s */
223  sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);
224  sumdiffs = vec_splat(sumdiffs, 3);
225  vec_ste(sumdiffs, 0, &s);
226 
227  return s;
228 }
229 
230 static int sad16_altivec(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
231 {
232  int i;
233  int s;
234  const vector unsigned int zero = (const vector unsigned int)vec_splat_u32(0);
235  vector unsigned char perm = vec_lvsl(0, pix2);
236  vector unsigned char t1, t2, t3,t4, t5;
237  vector unsigned int sad;
238  vector signed int sumdiffs;
239 
240  sad = (vector unsigned int)vec_splat_u32(0);
241 
242 
243  for (i = 0; i < h; i++) {
244  /* Read potentially unaligned pixels into t1 and t2 */
245  vector unsigned char pix2l = vec_ld( 0, pix2);
246  vector unsigned char pix2r = vec_ld(15, pix2);
247  t1 = vec_ld(0, pix1);
248  t2 = vec_perm(pix2l, pix2r, perm);
249 
250  /* Calculate a sum of abs differences vector */
251  t3 = vec_max(t1, t2);
252  t4 = vec_min(t1, t2);
253  t5 = vec_sub(t3, t4);
254 
255  /* Add each 4 pixel group together and put 4 results into sad */
256  sad = vec_sum4s(t5, sad);
257 
258  pix1 += line_size;
259  pix2 += line_size;
260  }
261 
262  /* Sum up the four partial sums, and put the result into s */
263  sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);
264  sumdiffs = vec_splat(sumdiffs, 3);
265  vec_ste(sumdiffs, 0, &s);
266 
267  return s;
268 }
269 
270 static int sad8_altivec(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
271 {
272  int i;
273  int s;
274  const vector unsigned int zero = (const vector unsigned int)vec_splat_u32(0);
275  const vector unsigned char permclear = (vector unsigned char){255,255,255,255,255,255,255,255,0,0,0,0,0,0,0,0};
276  vector unsigned char perm1 = vec_lvsl(0, pix1);
277  vector unsigned char perm2 = vec_lvsl(0, pix2);
278  vector unsigned char t1, t2, t3,t4, t5;
279  vector unsigned int sad;
280  vector signed int sumdiffs;
281 
282  sad = (vector unsigned int)vec_splat_u32(0);
283 
284  for (i = 0; i < h; i++) {
285  /* Read potentially unaligned pixels into t1 and t2
286  Since we're reading 16 pixels, and actually only want 8,
287  mask out the last 8 pixels. The 0s don't change the sum. */
288  vector unsigned char pix1l = vec_ld(0, pix1);
289  vector unsigned char pix1r = vec_ld(7, pix1);
290  vector unsigned char pix2l = vec_ld(0, pix2);
291  vector unsigned char pix2r = vec_ld(7, pix2);
292  t1 = vec_and(vec_perm(pix1l, pix1r, perm1), permclear);
293  t2 = vec_and(vec_perm(pix2l, pix2r, perm2), permclear);
294 
295  /* Calculate a sum of abs differences vector */
296  t3 = vec_max(t1, t2);
297  t4 = vec_min(t1, t2);
298  t5 = vec_sub(t3, t4);
299 
300  /* Add each 4 pixel group together and put 4 results into sad */
301  sad = vec_sum4s(t5, sad);
302 
303  pix1 += line_size;
304  pix2 += line_size;
305  }
306 
307  /* Sum up the four partial sums, and put the result into s */
308  sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);
309  sumdiffs = vec_splat(sumdiffs, 3);
310  vec_ste(sumdiffs, 0, &s);
311 
312  return s;
313 }
314 
315 static int pix_norm1_altivec(uint8_t *pix, int line_size)
316 {
317  int i;
318  int s;
319  const vector unsigned int zero = (const vector unsigned int)vec_splat_u32(0);
320  vector unsigned char perm = vec_lvsl(0, pix);
321  vector unsigned char pixv;
322  vector unsigned int sv;
323  vector signed int sum;
324 
325  sv = (vector unsigned int)vec_splat_u32(0);
326 
327  s = 0;
328  for (i = 0; i < 16; i++) {
329  /* Read in the potentially unaligned pixels */
330  vector unsigned char pixl = vec_ld( 0, pix);
331  vector unsigned char pixr = vec_ld(15, pix);
332  pixv = vec_perm(pixl, pixr, perm);
333 
334  /* Square the values, and add them to our sum */
335  sv = vec_msum(pixv, pixv, sv);
336 
337  pix += line_size;
338  }
339  /* Sum up the four partial sums, and put the result into s */
340  sum = vec_sums((vector signed int) sv, (vector signed int) zero);
341  sum = vec_splat(sum, 3);
342  vec_ste(sum, 0, &s);
343 
344  return s;
345 }
346 
347 /**
348  * Sum of Squared Errors for a 8x8 block.
349  * AltiVec-enhanced.
350  * It's the sad8_altivec code above w/ squaring added.
351  */
352 static int sse8_altivec(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
353 {
354  int i;
355  int s;
356  const vector unsigned int zero = (const vector unsigned int)vec_splat_u32(0);
357  const vector unsigned char permclear = (vector unsigned char){255,255,255,255,255,255,255,255,0,0,0,0,0,0,0,0};
358  vector unsigned char perm1 = vec_lvsl(0, pix1);
359  vector unsigned char perm2 = vec_lvsl(0, pix2);
360  vector unsigned char t1, t2, t3,t4, t5;
361  vector unsigned int sum;
362  vector signed int sumsqr;
363 
364  sum = (vector unsigned int)vec_splat_u32(0);
365 
366  for (i = 0; i < h; i++) {
367  /* Read potentially unaligned pixels into t1 and t2
368  Since we're reading 16 pixels, and actually only want 8,
369  mask out the last 8 pixels. The 0s don't change the sum. */
370  vector unsigned char pix1l = vec_ld(0, pix1);
371  vector unsigned char pix1r = vec_ld(7, pix1);
372  vector unsigned char pix2l = vec_ld(0, pix2);
373  vector unsigned char pix2r = vec_ld(7, pix2);
374  t1 = vec_and(vec_perm(pix1l, pix1r, perm1), permclear);
375  t2 = vec_and(vec_perm(pix2l, pix2r, perm2), permclear);
376 
377  /* Since we want to use unsigned chars, we can take advantage
378  of the fact that abs(a-b)^2 = (a-b)^2. */
379 
380  /* Calculate abs differences vector */
381  t3 = vec_max(t1, t2);
382  t4 = vec_min(t1, t2);
383  t5 = vec_sub(t3, t4);
384 
385  /* Square the values and add them to our sum */
386  sum = vec_msum(t5, t5, sum);
387 
388  pix1 += line_size;
389  pix2 += line_size;
390  }
391 
392  /* Sum up the four partial sums, and put the result into s */
393  sumsqr = vec_sums((vector signed int) sum, (vector signed int) zero);
394  sumsqr = vec_splat(sumsqr, 3);
395  vec_ste(sumsqr, 0, &s);
396 
397  return s;
398 }
399 
400 /**
401  * Sum of Squared Errors for a 16x16 block.
402  * AltiVec-enhanced.
403  * It's the sad16_altivec code above w/ squaring added.
404  */
405 static int sse16_altivec(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
406 {
407  int i;
408  int s;
409  const vector unsigned int zero = (const vector unsigned int)vec_splat_u32(0);
410  vector unsigned char perm = vec_lvsl(0, pix2);
411  vector unsigned char t1, t2, t3,t4, t5;
412  vector unsigned int sum;
413  vector signed int sumsqr;
414 
415  sum = (vector unsigned int)vec_splat_u32(0);
416 
417  for (i = 0; i < h; i++) {
418  /* Read potentially unaligned pixels into t1 and t2 */
419  vector unsigned char pix2l = vec_ld( 0, pix2);
420  vector unsigned char pix2r = vec_ld(15, pix2);
421  t1 = vec_ld(0, pix1);
422  t2 = vec_perm(pix2l, pix2r, perm);
423 
424  /* Since we want to use unsigned chars, we can take advantage
425  of the fact that abs(a-b)^2 = (a-b)^2. */
426 
427  /* Calculate abs differences vector */
428  t3 = vec_max(t1, t2);
429  t4 = vec_min(t1, t2);
430  t5 = vec_sub(t3, t4);
431 
432  /* Square the values and add them to our sum */
433  sum = vec_msum(t5, t5, sum);
434 
435  pix1 += line_size;
436  pix2 += line_size;
437  }
438 
439  /* Sum up the four partial sums, and put the result into s */
440  sumsqr = vec_sums((vector signed int) sum, (vector signed int) zero);
441  sumsqr = vec_splat(sumsqr, 3);
442  vec_ste(sumsqr, 0, &s);
443 
444  return s;
445 }
446 
447 static int pix_sum_altivec(uint8_t * pix, int line_size)
448 {
449  const vector unsigned int zero = (const vector unsigned int)vec_splat_u32(0);
450  vector unsigned char perm = vec_lvsl(0, pix);
451  vector unsigned char t1;
452  vector unsigned int sad;
453  vector signed int sumdiffs;
454 
455  int i;
456  int s;
457 
458  sad = (vector unsigned int)vec_splat_u32(0);
459 
460  for (i = 0; i < 16; i++) {
461  /* Read the potentially unaligned 16 pixels into t1 */
462  vector unsigned char pixl = vec_ld( 0, pix);
463  vector unsigned char pixr = vec_ld(15, pix);
464  t1 = vec_perm(pixl, pixr, perm);
465 
466  /* Add each 4 pixel group together and put 4 results into sad */
467  sad = vec_sum4s(t1, sad);
468 
469  pix += line_size;
470  }
471 
472  /* Sum up the four partial sums, and put the result into s */
473  sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);
474  sumdiffs = vec_splat(sumdiffs, 3);
475  vec_ste(sumdiffs, 0, &s);
476 
477  return s;
478 }
479 
480 static void get_pixels_altivec(int16_t *restrict block, const uint8_t *pixels, int line_size)
481 {
482  int i;
483  vector unsigned char perm = vec_lvsl(0, pixels);
484  vector unsigned char bytes;
485  const vector unsigned char zero = (const vector unsigned char)vec_splat_u8(0);
486  vector signed short shorts;
487 
488  for (i = 0; i < 8; i++) {
489  // Read potentially unaligned pixels.
490  // We're reading 16 pixels, and actually only want 8,
491  // but we simply ignore the extras.
492  vector unsigned char pixl = vec_ld(0, pixels);
493  vector unsigned char pixr = vec_ld(7, pixels);
494  bytes = vec_perm(pixl, pixr, perm);
495 
496  // convert the bytes into shorts
497  shorts = (vector signed short)vec_mergeh(zero, bytes);
498 
499  // save the data to the block, we assume the block is 16-byte aligned
500  vec_st(shorts, i*16, (vector signed short*)block);
501 
502  pixels += line_size;
503  }
504 }
505 
506 static void diff_pixels_altivec(int16_t *restrict block, const uint8_t *s1,
507  const uint8_t *s2, int stride)
508 {
509  int i;
510  vector unsigned char perm1 = vec_lvsl(0, s1);
511  vector unsigned char perm2 = vec_lvsl(0, s2);
512  vector unsigned char bytes, pixl, pixr;
513  const vector unsigned char zero = (const vector unsigned char)vec_splat_u8(0);
514  vector signed short shorts1, shorts2;
515 
516  for (i = 0; i < 4; i++) {
517  // Read potentially unaligned pixels
518  // We're reading 16 pixels, and actually only want 8,
519  // but we simply ignore the extras.
520  pixl = vec_ld( 0, s1);
521  pixr = vec_ld(15, s1);
522  bytes = vec_perm(pixl, pixr, perm1);
523 
524  // convert the bytes into shorts
525  shorts1 = (vector signed short)vec_mergeh(zero, bytes);
526 
527  // Do the same for the second block of pixels
528  pixl = vec_ld( 0, s2);
529  pixr = vec_ld(15, s2);
530  bytes = vec_perm(pixl, pixr, perm2);
531 
532  // convert the bytes into shorts
533  shorts2 = (vector signed short)vec_mergeh(zero, bytes);
534 
535  // Do the subtraction
536  shorts1 = vec_sub(shorts1, shorts2);
537 
538  // save the data to the block, we assume the block is 16-byte aligned
539  vec_st(shorts1, 0, (vector signed short*)block);
540 
541  s1 += stride;
542  s2 += stride;
543  block += 8;
544 
545 
546  // The code below is a copy of the code above... This is a manual
547  // unroll.
548 
549  // Read potentially unaligned pixels
550  // We're reading 16 pixels, and actually only want 8,
551  // but we simply ignore the extras.
552  pixl = vec_ld( 0, s1);
553  pixr = vec_ld(15, s1);
554  bytes = vec_perm(pixl, pixr, perm1);
555 
556  // convert the bytes into shorts
557  shorts1 = (vector signed short)vec_mergeh(zero, bytes);
558 
559  // Do the same for the second block of pixels
560  pixl = vec_ld( 0, s2);
561  pixr = vec_ld(15, s2);
562  bytes = vec_perm(pixl, pixr, perm2);
563 
564  // convert the bytes into shorts
565  shorts2 = (vector signed short)vec_mergeh(zero, bytes);
566 
567  // Do the subtraction
568  shorts1 = vec_sub(shorts1, shorts2);
569 
570  // save the data to the block, we assume the block is 16-byte aligned
571  vec_st(shorts1, 0, (vector signed short*)block);
572 
573  s1 += stride;
574  s2 += stride;
575  block += 8;
576  }
577 }
578 
579 
580 static void clear_block_altivec(int16_t *block) {
581  LOAD_ZERO;
582  vec_st(zero_s16v, 0, block);
583  vec_st(zero_s16v, 16, block);
584  vec_st(zero_s16v, 32, block);
585  vec_st(zero_s16v, 48, block);
586  vec_st(zero_s16v, 64, block);
587  vec_st(zero_s16v, 80, block);
588  vec_st(zero_s16v, 96, block);
589  vec_st(zero_s16v, 112, block);
590 }
591 
592 
593 static void add_bytes_altivec(uint8_t *dst, uint8_t *src, int w) {
594  register int i;
595  register vector unsigned char vdst, vsrc;
596 
597  /* dst and src are 16 bytes-aligned (guaranteed) */
598  for (i = 0 ; (i + 15) < w ; i+=16) {
599  vdst = vec_ld(i, (unsigned char*)dst);
600  vsrc = vec_ld(i, (unsigned char*)src);
601  vdst = vec_add(vsrc, vdst);
602  vec_st(vdst, i, (unsigned char*)dst);
603  }
604  /* if w is not a multiple of 16 */
605  for (; (i < w) ; i++) {
606  dst[i] = src[i];
607  }
608 }
609 
610 static int hadamard8_diff8x8_altivec(/*MpegEncContext*/ void *s, uint8_t *dst, uint8_t *src, int stride, int h){
611  int sum;
612  register const vector unsigned char vzero =
613  (const vector unsigned char)vec_splat_u8(0);
614  register vector signed short temp0, temp1, temp2, temp3, temp4,
615  temp5, temp6, temp7;
616  {
617  register const vector signed short vprod1 =(const vector signed short)
618  { 1,-1, 1,-1, 1,-1, 1,-1 };
619  register const vector signed short vprod2 =(const vector signed short)
620  { 1, 1,-1,-1, 1, 1,-1,-1 };
621  register const vector signed short vprod3 =(const vector signed short)
622  { 1, 1, 1, 1,-1,-1,-1,-1 };
623  register const vector unsigned char perm1 = (const vector unsigned char)
624  {0x02, 0x03, 0x00, 0x01, 0x06, 0x07, 0x04, 0x05,
625  0x0A, 0x0B, 0x08, 0x09, 0x0E, 0x0F, 0x0C, 0x0D};
626  register const vector unsigned char perm2 = (const vector unsigned char)
627  {0x04, 0x05, 0x06, 0x07, 0x00, 0x01, 0x02, 0x03,
628  0x0C, 0x0D, 0x0E, 0x0F, 0x08, 0x09, 0x0A, 0x0B};
629  register const vector unsigned char perm3 = (const vector unsigned char)
630  {0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
631  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07};
632 
633 #define ONEITERBUTTERFLY(i, res) \
634  { \
635  register vector unsigned char src1, src2, srcO; \
636  register vector unsigned char dst1, dst2, dstO; \
637  register vector signed short srcV, dstV; \
638  register vector signed short but0, but1, but2, op1, op2, op3; \
639  src1 = vec_ld(stride * i, src); \
640  src2 = vec_ld((stride * i) + 15, src); \
641  srcO = vec_perm(src1, src2, vec_lvsl(stride * i, src)); \
642  dst1 = vec_ld(stride * i, dst); \
643  dst2 = vec_ld((stride * i) + 15, dst); \
644  dstO = vec_perm(dst1, dst2, vec_lvsl(stride * i, dst)); \
645  /* promote the unsigned chars to signed shorts */ \
646  /* we're in the 8x8 function, we only care for the first 8 */ \
647  srcV = (vector signed short)vec_mergeh((vector signed char)vzero, \
648  (vector signed char)srcO); \
649  dstV = (vector signed short)vec_mergeh((vector signed char)vzero, \
650  (vector signed char)dstO); \
651  /* subtractions inside the first butterfly */ \
652  but0 = vec_sub(srcV, dstV); \
653  op1 = vec_perm(but0, but0, perm1); \
654  but1 = vec_mladd(but0, vprod1, op1); \
655  op2 = vec_perm(but1, but1, perm2); \
656  but2 = vec_mladd(but1, vprod2, op2); \
657  op3 = vec_perm(but2, but2, perm3); \
658  res = vec_mladd(but2, vprod3, op3); \
659  }
660  ONEITERBUTTERFLY(0, temp0);
661  ONEITERBUTTERFLY(1, temp1);
662  ONEITERBUTTERFLY(2, temp2);
663  ONEITERBUTTERFLY(3, temp3);
664  ONEITERBUTTERFLY(4, temp4);
665  ONEITERBUTTERFLY(5, temp5);
666  ONEITERBUTTERFLY(6, temp6);
667  ONEITERBUTTERFLY(7, temp7);
668  }
669 #undef ONEITERBUTTERFLY
670  {
671  register vector signed int vsum;
672  register vector signed short line0 = vec_add(temp0, temp1);
673  register vector signed short line1 = vec_sub(temp0, temp1);
674  register vector signed short line2 = vec_add(temp2, temp3);
675  register vector signed short line3 = vec_sub(temp2, temp3);
676  register vector signed short line4 = vec_add(temp4, temp5);
677  register vector signed short line5 = vec_sub(temp4, temp5);
678  register vector signed short line6 = vec_add(temp6, temp7);
679  register vector signed short line7 = vec_sub(temp6, temp7);
680 
681  register vector signed short line0B = vec_add(line0, line2);
682  register vector signed short line2B = vec_sub(line0, line2);
683  register vector signed short line1B = vec_add(line1, line3);
684  register vector signed short line3B = vec_sub(line1, line3);
685  register vector signed short line4B = vec_add(line4, line6);
686  register vector signed short line6B = vec_sub(line4, line6);
687  register vector signed short line5B = vec_add(line5, line7);
688  register vector signed short line7B = vec_sub(line5, line7);
689 
690  register vector signed short line0C = vec_add(line0B, line4B);
691  register vector signed short line4C = vec_sub(line0B, line4B);
692  register vector signed short line1C = vec_add(line1B, line5B);
693  register vector signed short line5C = vec_sub(line1B, line5B);
694  register vector signed short line2C = vec_add(line2B, line6B);
695  register vector signed short line6C = vec_sub(line2B, line6B);
696  register vector signed short line3C = vec_add(line3B, line7B);
697  register vector signed short line7C = vec_sub(line3B, line7B);
698 
699  vsum = vec_sum4s(vec_abs(line0C), vec_splat_s32(0));
700  vsum = vec_sum4s(vec_abs(line1C), vsum);
701  vsum = vec_sum4s(vec_abs(line2C), vsum);
702  vsum = vec_sum4s(vec_abs(line3C), vsum);
703  vsum = vec_sum4s(vec_abs(line4C), vsum);
704  vsum = vec_sum4s(vec_abs(line5C), vsum);
705  vsum = vec_sum4s(vec_abs(line6C), vsum);
706  vsum = vec_sum4s(vec_abs(line7C), vsum);
707  vsum = vec_sums(vsum, (vector signed int)vzero);
708  vsum = vec_splat(vsum, 3);
709  vec_ste(vsum, 0, &sum);
710  }
711  return sum;
712 }
713 
714 /*
715 16x8 works with 16 elements; it allows to avoid replicating loads, and
716 give the compiler more rooms for scheduling. It's only used from
717 inside hadamard8_diff16_altivec.
718 
719 Unfortunately, it seems gcc-3.3 is a bit dumb, and the compiled code has a LOT
720 of spill code, it seems gcc (unlike xlc) cannot keep everything in registers
721 by itself. The following code include hand-made registers allocation. It's not
722 clean, but on a 7450 the resulting code is much faster (best case fall from
723 700+ cycles to 550).
724 
725 xlc doesn't add spill code, but it doesn't know how to schedule for the 7450,
726 and its code isn't much faster than gcc-3.3 on the 7450 (but uses 25% less
727 instructions...)
728 
729 On the 970, the hand-made RA is still a win (around 690 vs. around 780), but
730 xlc goes to around 660 on the regular C code...
731 */
732 
733 static int hadamard8_diff16x8_altivec(/*MpegEncContext*/ void *s, uint8_t *dst, uint8_t *src, int stride, int h) {
734  int sum;
735  register vector signed short
736  temp0 __asm__ ("v0"),
737  temp1 __asm__ ("v1"),
738  temp2 __asm__ ("v2"),
739  temp3 __asm__ ("v3"),
740  temp4 __asm__ ("v4"),
741  temp5 __asm__ ("v5"),
742  temp6 __asm__ ("v6"),
743  temp7 __asm__ ("v7");
744  register vector signed short
745  temp0S __asm__ ("v8"),
746  temp1S __asm__ ("v9"),
747  temp2S __asm__ ("v10"),
748  temp3S __asm__ ("v11"),
749  temp4S __asm__ ("v12"),
750  temp5S __asm__ ("v13"),
751  temp6S __asm__ ("v14"),
752  temp7S __asm__ ("v15");
753  register const vector unsigned char vzero __asm__ ("v31") =
754  (const vector unsigned char)vec_splat_u8(0);
755  {
756  register const vector signed short vprod1 __asm__ ("v16") =
757  (const vector signed short){ 1,-1, 1,-1, 1,-1, 1,-1 };
758  register const vector signed short vprod2 __asm__ ("v17") =
759  (const vector signed short){ 1, 1,-1,-1, 1, 1,-1,-1 };
760  register const vector signed short vprod3 __asm__ ("v18") =
761  (const vector signed short){ 1, 1, 1, 1,-1,-1,-1,-1 };
762  register const vector unsigned char perm1 __asm__ ("v19") =
763  (const vector unsigned char)
764  {0x02, 0x03, 0x00, 0x01, 0x06, 0x07, 0x04, 0x05,
765  0x0A, 0x0B, 0x08, 0x09, 0x0E, 0x0F, 0x0C, 0x0D};
766  register const vector unsigned char perm2 __asm__ ("v20") =
767  (const vector unsigned char)
768  {0x04, 0x05, 0x06, 0x07, 0x00, 0x01, 0x02, 0x03,
769  0x0C, 0x0D, 0x0E, 0x0F, 0x08, 0x09, 0x0A, 0x0B};
770  register const vector unsigned char perm3 __asm__ ("v21") =
771  (const vector unsigned char)
772  {0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
773  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07};
774 
775 #define ONEITERBUTTERFLY(i, res1, res2) \
776  { \
777  register vector unsigned char src1 __asm__ ("v22"), \
778  src2 __asm__ ("v23"), \
779  dst1 __asm__ ("v24"), \
780  dst2 __asm__ ("v25"), \
781  srcO __asm__ ("v22"), \
782  dstO __asm__ ("v23"); \
783  \
784  register vector signed short srcV __asm__ ("v24"), \
785  dstV __asm__ ("v25"), \
786  srcW __asm__ ("v26"), \
787  dstW __asm__ ("v27"), \
788  but0 __asm__ ("v28"), \
789  but0S __asm__ ("v29"), \
790  op1 __asm__ ("v30"), \
791  but1 __asm__ ("v22"), \
792  op1S __asm__ ("v23"), \
793  but1S __asm__ ("v24"), \
794  op2 __asm__ ("v25"), \
795  but2 __asm__ ("v26"), \
796  op2S __asm__ ("v27"), \
797  but2S __asm__ ("v28"), \
798  op3 __asm__ ("v29"), \
799  op3S __asm__ ("v30"); \
800  \
801  src1 = vec_ld(stride * i, src); \
802  src2 = vec_ld((stride * i) + 16, src); \
803  srcO = vec_perm(src1, src2, vec_lvsl(stride * i, src)); \
804  dst1 = vec_ld(stride * i, dst); \
805  dst2 = vec_ld((stride * i) + 16, dst); \
806  dstO = vec_perm(dst1, dst2, vec_lvsl(stride * i, dst)); \
807  /* promote the unsigned chars to signed shorts */ \
808  srcV = (vector signed short)vec_mergeh((vector signed char)vzero, \
809  (vector signed char)srcO); \
810  dstV = (vector signed short)vec_mergeh((vector signed char)vzero, \
811  (vector signed char)dstO); \
812  srcW = (vector signed short)vec_mergel((vector signed char)vzero, \
813  (vector signed char)srcO); \
814  dstW = (vector signed short)vec_mergel((vector signed char)vzero, \
815  (vector signed char)dstO); \
816  /* subtractions inside the first butterfly */ \
817  but0 = vec_sub(srcV, dstV); \
818  but0S = vec_sub(srcW, dstW); \
819  op1 = vec_perm(but0, but0, perm1); \
820  but1 = vec_mladd(but0, vprod1, op1); \
821  op1S = vec_perm(but0S, but0S, perm1); \
822  but1S = vec_mladd(but0S, vprod1, op1S); \
823  op2 = vec_perm(but1, but1, perm2); \
824  but2 = vec_mladd(but1, vprod2, op2); \
825  op2S = vec_perm(but1S, but1S, perm2); \
826  but2S = vec_mladd(but1S, vprod2, op2S); \
827  op3 = vec_perm(but2, but2, perm3); \
828  res1 = vec_mladd(but2, vprod3, op3); \
829  op3S = vec_perm(but2S, but2S, perm3); \
830  res2 = vec_mladd(but2S, vprod3, op3S); \
831  }
832  ONEITERBUTTERFLY(0, temp0, temp0S);
833  ONEITERBUTTERFLY(1, temp1, temp1S);
834  ONEITERBUTTERFLY(2, temp2, temp2S);
835  ONEITERBUTTERFLY(3, temp3, temp3S);
836  ONEITERBUTTERFLY(4, temp4, temp4S);
837  ONEITERBUTTERFLY(5, temp5, temp5S);
838  ONEITERBUTTERFLY(6, temp6, temp6S);
839  ONEITERBUTTERFLY(7, temp7, temp7S);
840  }
841 #undef ONEITERBUTTERFLY
842  {
843  register vector signed int vsum;
844  register vector signed short line0S, line1S, line2S, line3S, line4S,
845  line5S, line6S, line7S, line0BS,line2BS,
846  line1BS,line3BS,line4BS,line6BS,line5BS,
847  line7BS,line0CS,line4CS,line1CS,line5CS,
848  line2CS,line6CS,line3CS,line7CS;
849 
850  register vector signed short line0 = vec_add(temp0, temp1);
851  register vector signed short line1 = vec_sub(temp0, temp1);
852  register vector signed short line2 = vec_add(temp2, temp3);
853  register vector signed short line3 = vec_sub(temp2, temp3);
854  register vector signed short line4 = vec_add(temp4, temp5);
855  register vector signed short line5 = vec_sub(temp4, temp5);
856  register vector signed short line6 = vec_add(temp6, temp7);
857  register vector signed short line7 = vec_sub(temp6, temp7);
858 
859  register vector signed short line0B = vec_add(line0, line2);
860  register vector signed short line2B = vec_sub(line0, line2);
861  register vector signed short line1B = vec_add(line1, line3);
862  register vector signed short line3B = vec_sub(line1, line3);
863  register vector signed short line4B = vec_add(line4, line6);
864  register vector signed short line6B = vec_sub(line4, line6);
865  register vector signed short line5B = vec_add(line5, line7);
866  register vector signed short line7B = vec_sub(line5, line7);
867 
868  register vector signed short line0C = vec_add(line0B, line4B);
869  register vector signed short line4C = vec_sub(line0B, line4B);
870  register vector signed short line1C = vec_add(line1B, line5B);
871  register vector signed short line5C = vec_sub(line1B, line5B);
872  register vector signed short line2C = vec_add(line2B, line6B);
873  register vector signed short line6C = vec_sub(line2B, line6B);
874  register vector signed short line3C = vec_add(line3B, line7B);
875  register vector signed short line7C = vec_sub(line3B, line7B);
876 
877  vsum = vec_sum4s(vec_abs(line0C), vec_splat_s32(0));
878  vsum = vec_sum4s(vec_abs(line1C), vsum);
879  vsum = vec_sum4s(vec_abs(line2C), vsum);
880  vsum = vec_sum4s(vec_abs(line3C), vsum);
881  vsum = vec_sum4s(vec_abs(line4C), vsum);
882  vsum = vec_sum4s(vec_abs(line5C), vsum);
883  vsum = vec_sum4s(vec_abs(line6C), vsum);
884  vsum = vec_sum4s(vec_abs(line7C), vsum);
885 
886  line0S = vec_add(temp0S, temp1S);
887  line1S = vec_sub(temp0S, temp1S);
888  line2S = vec_add(temp2S, temp3S);
889  line3S = vec_sub(temp2S, temp3S);
890  line4S = vec_add(temp4S, temp5S);
891  line5S = vec_sub(temp4S, temp5S);
892  line6S = vec_add(temp6S, temp7S);
893  line7S = vec_sub(temp6S, temp7S);
894 
895  line0BS = vec_add(line0S, line2S);
896  line2BS = vec_sub(line0S, line2S);
897  line1BS = vec_add(line1S, line3S);
898  line3BS = vec_sub(line1S, line3S);
899  line4BS = vec_add(line4S, line6S);
900  line6BS = vec_sub(line4S, line6S);
901  line5BS = vec_add(line5S, line7S);
902  line7BS = vec_sub(line5S, line7S);
903 
904  line0CS = vec_add(line0BS, line4BS);
905  line4CS = vec_sub(line0BS, line4BS);
906  line1CS = vec_add(line1BS, line5BS);
907  line5CS = vec_sub(line1BS, line5BS);
908  line2CS = vec_add(line2BS, line6BS);
909  line6CS = vec_sub(line2BS, line6BS);
910  line3CS = vec_add(line3BS, line7BS);
911  line7CS = vec_sub(line3BS, line7BS);
912 
913  vsum = vec_sum4s(vec_abs(line0CS), vsum);
914  vsum = vec_sum4s(vec_abs(line1CS), vsum);
915  vsum = vec_sum4s(vec_abs(line2CS), vsum);
916  vsum = vec_sum4s(vec_abs(line3CS), vsum);
917  vsum = vec_sum4s(vec_abs(line4CS), vsum);
918  vsum = vec_sum4s(vec_abs(line5CS), vsum);
919  vsum = vec_sum4s(vec_abs(line6CS), vsum);
920  vsum = vec_sum4s(vec_abs(line7CS), vsum);
921  vsum = vec_sums(vsum, (vector signed int)vzero);
922  vsum = vec_splat(vsum, 3);
923  vec_ste(vsum, 0, &sum);
924  }
925  return sum;
926 }
927 
928 static int hadamard8_diff16_altivec(/*MpegEncContext*/ void *s, uint8_t *dst, uint8_t *src, int stride, int h){
929  int score;
930  score = hadamard8_diff16x8_altivec(s, dst, src, stride, 8);
931  if (h==16) {
932  dst += 8*stride;
933  src += 8*stride;
934  score += hadamard8_diff16x8_altivec(s, dst, src, stride, 8);
935  }
936  return score;
937 }
938 
939 av_cold void ff_dsputil_init_altivec(DSPContext *c, AVCodecContext *avctx)
940 {
941  const int high_bit_depth = avctx->bits_per_raw_sample > 8;
942 
943  c->pix_abs[0][1] = sad16_x2_altivec;
944  c->pix_abs[0][2] = sad16_y2_altivec;
945  c->pix_abs[0][3] = sad16_xy2_altivec;
946  c->pix_abs[0][0] = sad16_altivec;
947  c->pix_abs[1][0] = sad8_altivec;
948  c->sad[0]= sad16_altivec;
949  c->sad[1]= sad8_altivec;
950  c->pix_norm1 = pix_norm1_altivec;
951  c->sse[1]= sse8_altivec;
952  c->sse[0]= sse16_altivec;
953  c->pix_sum = pix_sum_altivec;
954  c->diff_pixels = diff_pixels_altivec;
955  c->add_bytes= add_bytes_altivec;
956  if (!high_bit_depth) {
957  c->get_pixels = get_pixels_altivec;
958  c->clear_block = clear_block_altivec;
959  }
960 
961  c->hadamard8_diff[0] = hadamard8_diff16_altivec;
962  c->hadamard8_diff[1] = hadamard8_diff8x8_altivec;
963 }
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