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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 
28 #include "libavutil/attributes.h"
29 #include "libavutil/cpu.h"
30 #include "libavutil/ppc/cpu.h"
31 #include "libavutil/ppc/types_altivec.h"
32 #include "libavutil/ppc/util_altivec.h"
33 #include "libavcodec/avcodec.h"
34 #include "libavcodec/dsputil.h"
35 #include "libavcodec/mpegvideo.h"
36 
37 #if HAVE_ALTIVEC
38 static int sad16_x2_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
39  int line_size, int h)
40 {
41  int i, s = 0;
42  const vector unsigned char zero =
43  (const vector unsigned char) vec_splat_u8(0);
44  vector unsigned char perm1 = vec_lvsl(0, pix2);
45  vector unsigned char perm2 = vec_add(perm1, vec_splat_u8(1));
46  vector unsigned int sad = (vector unsigned int) vec_splat_u32(0);
47  vector signed int sumdiffs;
48 
49  for (i = 0; i < h; i++) {
50  /* Read unaligned pixels into our vectors. The vectors are as follows:
51  * pix1v: pix1[0] - pix1[15]
52  * pix2v: pix2[0] - pix2[15] pix2iv: pix2[1] - pix2[16] */
53  vector unsigned char pix1v = vec_ld(0, pix1);
54  vector unsigned char pix2l = vec_ld(0, pix2);
55  vector unsigned char pix2r = vec_ld(16, pix2);
56  vector unsigned char pix2v = vec_perm(pix2l, pix2r, perm1);
57  vector unsigned char pix2iv = vec_perm(pix2l, pix2r, perm2);
58 
59  /* Calculate the average vector. */
60  vector unsigned char avgv = vec_avg(pix2v, pix2iv);
61 
62  /* Calculate a sum of abs differences vector. */
63  vector unsigned char t5 = vec_sub(vec_max(pix1v, avgv),
64  vec_min(pix1v, avgv));
65 
66  /* Add each 4 pixel group together and put 4 results into sad. */
67  sad = vec_sum4s(t5, sad);
68 
69  pix1 += line_size;
70  pix2 += line_size;
71  }
72  /* Sum up the four partial sums, and put the result into s. */
73  sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);
74  sumdiffs = vec_splat(sumdiffs, 3);
75  vec_ste(sumdiffs, 0, &s);
76 
77  return s;
78 }
79 
80 static int sad16_y2_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
81  int line_size, int h)
82 {
83  int i, s = 0;
84  const vector unsigned char zero =
85  (const vector unsigned char) vec_splat_u8(0);
86  vector unsigned char perm = vec_lvsl(0, pix2);
87  vector unsigned char pix1v, pix3v, avgv, t5;
88  vector unsigned int sad = (vector unsigned int) vec_splat_u32(0);
89  vector signed int sumdiffs;
90  uint8_t *pix3 = pix2 + line_size;
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  vector unsigned char pix2l = vec_ld(0, pix2);
100  vector unsigned char pix2r = vec_ld(15, pix2);
101  vector unsigned char 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  /* Sum up the four partial sums, and put the result into s. */
128  sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);
129  sumdiffs = vec_splat(sumdiffs, 3);
130  vec_ste(sumdiffs, 0, &s);
131  return s;
132 }
133 
134 static int sad16_xy2_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
135  int line_size, int h)
136 {
137  int i, s = 0;
138  uint8_t *pix3 = pix2 + line_size;
139  const vector unsigned char zero =
140  (const vector unsigned char) vec_splat_u8(0);
141  const vector unsigned short two =
142  (const vector unsigned short) vec_splat_u16(2);
143  vector unsigned char avgv, t5;
144  vector unsigned char perm1 = vec_lvsl(0, pix2);
145  vector unsigned char perm2 = vec_add(perm1, vec_splat_u8(1));
146  vector unsigned char pix1v, pix3v, pix3iv;
147  vector unsigned short pix3lv, pix3hv, pix3ilv, pix3ihv;
148  vector unsigned short avghv, avglv;
149  vector unsigned int sad = (vector unsigned int) vec_splat_u32(0);
150  vector signed int sumdiffs;
151 
152  /* Due to the fact that pix3 = pix2 + line_size, the pix3 of one
153  * iteration becomes pix2 in the next iteration. We can use this
154  * fact to avoid a potentially expensive unaligned read, as well
155  * as some splitting, and vector addition each time around the loop.
156  * Read unaligned pixels into our vectors. The vectors are as follows:
157  * pix2v: pix2[0] - pix2[15] pix2iv: pix2[1] - pix2[16]
158  * Split the pixel vectors into shorts. */
159  vector unsigned char pix2l = vec_ld(0, pix2);
160  vector unsigned char pix2r = vec_ld(16, pix2);
161  vector unsigned char pix2v = vec_perm(pix2l, pix2r, perm1);
162  vector unsigned char pix2iv = vec_perm(pix2l, pix2r, perm2);
163 
164  vector unsigned short pix2hv =
165  (vector unsigned short) vec_mergeh(zero, pix2v);
166  vector unsigned short pix2lv =
167  (vector unsigned short) vec_mergel(zero, pix2v);
168  vector unsigned short pix2ihv =
169  (vector unsigned short) vec_mergeh(zero, pix2iv);
170  vector unsigned short pix2ilv =
171  (vector unsigned short) vec_mergel(zero, pix2iv);
172  vector unsigned short t1 = vec_add(pix2hv, pix2ihv);
173  vector unsigned short t2 = vec_add(pix2lv, pix2ilv);
174  vector unsigned short t3, t4;
175 
176  for (i = 0; i < h; i++) {
177  /* Read unaligned pixels into our vectors. The vectors are as follows:
178  * pix1v: pix1[0] - pix1[15]
179  * pix3v: pix3[0] - pix3[15] pix3iv: pix3[1] - pix3[16] */
180  pix1v = vec_ld(0, pix1);
181 
182  pix2l = vec_ld(0, pix3);
183  pix2r = vec_ld(16, pix3);
184  pix3v = vec_perm(pix2l, pix2r, perm1);
185  pix3iv = vec_perm(pix2l, pix2r, perm2);
186 
187  /* Note that AltiVec does have vec_avg, but this works on vector pairs
188  * and rounds up. We could do avg(avg(a, b), avg(c, d)), but the
189  * rounding would mean that, for example, avg(3, 0, 0, 1) = 2, when
190  * it should be 1. Instead, we have to split the pixel vectors into
191  * vectors of shorts and do the averaging by hand. */
192 
193  /* Split the pixel vectors into shorts. */
194  pix3hv = (vector unsigned short) vec_mergeh(zero, pix3v);
195  pix3lv = (vector unsigned short) vec_mergel(zero, pix3v);
196  pix3ihv = (vector unsigned short) vec_mergeh(zero, pix3iv);
197  pix3ilv = (vector unsigned short) vec_mergel(zero, pix3iv);
198 
199  /* Do the averaging on them. */
200  t3 = vec_add(pix3hv, pix3ihv);
201  t4 = vec_add(pix3lv, pix3ilv);
202 
203  avghv = vec_sr(vec_add(vec_add(t1, t3), two), two);
204  avglv = vec_sr(vec_add(vec_add(t2, t4), two), two);
205 
206  /* Pack the shorts back into a result. */
207  avgv = vec_pack(avghv, avglv);
208 
209  /* Calculate a sum of abs differences vector. */
210  t5 = vec_sub(vec_max(pix1v, avgv), vec_min(pix1v, avgv));
211 
212  /* Add each 4 pixel group together and put 4 results into sad. */
213  sad = vec_sum4s(t5, sad);
214 
215  pix1 += line_size;
216  pix3 += line_size;
217  /* Transfer the calculated values for pix3 into pix2. */
218  t1 = t3;
219  t2 = t4;
220  }
221  /* Sum up the four partial sums, and put the result into s. */
222  sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);
223  sumdiffs = vec_splat(sumdiffs, 3);
224  vec_ste(sumdiffs, 0, &s);
225 
226  return s;
227 }
228 
229 static int sad16_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
230  int line_size, int h)
231 {
232  int i, s;
233  const vector unsigned int zero =
234  (const vector unsigned int) vec_splat_u32(0);
235  vector unsigned char perm = vec_lvsl(0, pix2);
236  vector unsigned int sad = (vector unsigned int) vec_splat_u32(0);
237  vector signed int sumdiffs;
238 
239  for (i = 0; i < h; i++) {
240  /* Read potentially unaligned pixels into t1 and t2. */
241  vector unsigned char pix2l = vec_ld(0, pix2);
242  vector unsigned char pix2r = vec_ld(15, pix2);
243  vector unsigned char t1 = vec_ld(0, pix1);
244  vector unsigned char t2 = vec_perm(pix2l, pix2r, perm);
245 
246  /* Calculate a sum of abs differences vector. */
247  vector unsigned char t3 = vec_max(t1, t2);
248  vector unsigned char t4 = vec_min(t1, t2);
249  vector unsigned char t5 = vec_sub(t3, t4);
250 
251  /* Add each 4 pixel group together and put 4 results into sad. */
252  sad = vec_sum4s(t5, sad);
253 
254  pix1 += line_size;
255  pix2 += line_size;
256  }
257 
258  /* Sum up the four partial sums, and put the result into s. */
259  sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);
260  sumdiffs = vec_splat(sumdiffs, 3);
261  vec_ste(sumdiffs, 0, &s);
262 
263  return s;
264 }
265 
266 static int sad8_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
267  int line_size, int h)
268 {
269  int i, s;
270  const vector unsigned int zero =
271  (const vector unsigned int) vec_splat_u32(0);
272  const vector unsigned char permclear =
273  (vector unsigned char)
274  { 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 0, 0, 0, 0 };
275  vector unsigned char perm1 = vec_lvsl(0, pix1);
276  vector unsigned char perm2 = vec_lvsl(0, pix2);
277  vector unsigned int sad = (vector unsigned int) vec_splat_u32(0);
278  vector signed int sumdiffs;
279 
280  for (i = 0; i < h; i++) {
281  /* Read potentially unaligned pixels into t1 and t2.
282  * Since we're reading 16 pixels, and actually only want 8,
283  * mask out the last 8 pixels. The 0s don't change the sum. */
284  vector unsigned char pix1l = vec_ld(0, pix1);
285  vector unsigned char pix1r = vec_ld(7, pix1);
286  vector unsigned char pix2l = vec_ld(0, pix2);
287  vector unsigned char pix2r = vec_ld(7, pix2);
288  vector unsigned char t1 = vec_and(vec_perm(pix1l, pix1r, perm1),
289  permclear);
290  vector unsigned char t2 = vec_and(vec_perm(pix2l, pix2r, perm2),
291  permclear);
292 
293  /* Calculate a sum of abs differences vector. */
294  vector unsigned char t3 = vec_max(t1, t2);
295  vector unsigned char t4 = vec_min(t1, t2);
296  vector unsigned char t5 = vec_sub(t3, t4);
297 
298  /* Add each 4 pixel group together and put 4 results into sad. */
299  sad = vec_sum4s(t5, sad);
300 
301  pix1 += line_size;
302  pix2 += line_size;
303  }
304 
305  /* Sum up the four partial sums, and put the result into s. */
306  sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);
307  sumdiffs = vec_splat(sumdiffs, 3);
308  vec_ste(sumdiffs, 0, &s);
309 
310  return s;
311 }
312 
313 /* Sum of Squared Errors for an 8x8 block, AltiVec-enhanced.
314  * It's the sad8_altivec code above w/ squaring added. */
315 static int sse8_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
316  int line_size, int h)
317 {
318  int i, s;
319  const vector unsigned int zero =
320  (const vector unsigned int) vec_splat_u32(0);
321  const vector unsigned char permclear =
322  (vector unsigned char)
323  { 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 0, 0, 0, 0 };
324  vector unsigned char perm1 = vec_lvsl(0, pix1);
325  vector unsigned char perm2 = vec_lvsl(0, pix2);
326  vector unsigned int sum = (vector unsigned int) vec_splat_u32(0);
327  vector signed int sumsqr;
328 
329  for (i = 0; i < h; i++) {
330  /* Read potentially unaligned pixels into t1 and t2.
331  * Since we're reading 16 pixels, and actually only want 8,
332  * mask out the last 8 pixels. The 0s don't change the sum. */
333  vector unsigned char pix1l = vec_ld(0, pix1);
334  vector unsigned char pix1r = vec_ld(7, pix1);
335  vector unsigned char pix2l = vec_ld(0, pix2);
336  vector unsigned char pix2r = vec_ld(7, pix2);
337  vector unsigned char t1 = vec_and(vec_perm(pix1l, pix1r, perm1),
338  permclear);
339  vector unsigned char t2 = vec_and(vec_perm(pix2l, pix2r, perm2),
340  permclear);
341 
342  /* Since we want to use unsigned chars, we can take advantage
343  * of the fact that abs(a - b) ^ 2 = (a - b) ^ 2. */
344 
345  /* Calculate abs differences vector. */
346  vector unsigned char t3 = vec_max(t1, t2);
347  vector unsigned char t4 = vec_min(t1, t2);
348  vector unsigned char t5 = vec_sub(t3, t4);
349 
350  /* Square the values and add them to our sum. */
351  sum = vec_msum(t5, t5, sum);
352 
353  pix1 += line_size;
354  pix2 += line_size;
355  }
356 
357  /* Sum up the four partial sums, and put the result into s. */
358  sumsqr = vec_sums((vector signed int) sum, (vector signed int) zero);
359  sumsqr = vec_splat(sumsqr, 3);
360  vec_ste(sumsqr, 0, &s);
361 
362  return s;
363 }
364 
365 /* Sum of Squared Errors for a 16x16 block, AltiVec-enhanced.
366  * It's the sad16_altivec code above w/ squaring added. */
367 static int sse16_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
368  int line_size, int h)
369 {
370  int i, s;
371  const vector unsigned int zero =
372  (const vector unsigned int) vec_splat_u32(0);
373  vector unsigned char perm = vec_lvsl(0, pix2);
374  vector unsigned int sum = (vector unsigned int) vec_splat_u32(0);
375  vector signed int sumsqr;
376 
377  for (i = 0; i < h; i++) {
378  /* Read potentially unaligned pixels into t1 and t2. */
379  vector unsigned char pix2l = vec_ld(0, pix2);
380  vector unsigned char pix2r = vec_ld(15, pix2);
381  vector unsigned char t1 = vec_ld(0, pix1);
382  vector unsigned char t2 = vec_perm(pix2l, pix2r, perm);
383 
384  /* Since we want to use unsigned chars, we can take advantage
385  * of the fact that abs(a - b) ^ 2 = (a - b) ^ 2. */
386 
387  /* Calculate abs differences vector. */
388  vector unsigned char t3 = vec_max(t1, t2);
389  vector unsigned char t4 = vec_min(t1, t2);
390  vector unsigned char t5 = vec_sub(t3, t4);
391 
392  /* Square the values and add them to our sum. */
393  sum = vec_msum(t5, t5, sum);
394 
395  pix1 += line_size;
396  pix2 += line_size;
397  }
398 
399  /* Sum up the four partial sums, and put the result into s. */
400  sumsqr = vec_sums((vector signed int) sum, (vector signed int) zero);
401  sumsqr = vec_splat(sumsqr, 3);
402  vec_ste(sumsqr, 0, &s);
403 
404  return s;
405 }
406 
407 static int hadamard8_diff8x8_altivec(MpegEncContext *s, uint8_t *dst,
408  uint8_t *src, int stride, int h)
409 {
410  int sum;
411  register const vector unsigned char vzero =
412  (const vector unsigned char) vec_splat_u8(0);
413  register vector signed short temp0, temp1, temp2, temp3, temp4,
414  temp5, temp6, temp7;
415  {
416  register const vector signed short vprod1 =
417  (const vector signed short) { 1, -1, 1, -1, 1, -1, 1, -1 };
418  register const vector signed short vprod2 =
419  (const vector signed short) { 1, 1, -1, -1, 1, 1, -1, -1 };
420  register const vector signed short vprod3 =
421  (const vector signed short) { 1, 1, 1, 1, -1, -1, -1, -1 };
422  register const vector unsigned char perm1 =
423  (const vector unsigned char)
424  { 0x02, 0x03, 0x00, 0x01, 0x06, 0x07, 0x04, 0x05,
425  0x0A, 0x0B, 0x08, 0x09, 0x0E, 0x0F, 0x0C, 0x0D };
426  register const vector unsigned char perm2 =
427  (const vector unsigned char)
428  { 0x04, 0x05, 0x06, 0x07, 0x00, 0x01, 0x02, 0x03,
429  0x0C, 0x0D, 0x0E, 0x0F, 0x08, 0x09, 0x0A, 0x0B };
430  register const vector unsigned char perm3 =
431  (const vector unsigned char)
432  { 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
433  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 };
434 
435 #define ONEITERBUTTERFLY(i, res) \
436  { \
437  register vector unsigned char src1 = vec_ld(stride * i, src); \
438  register vector unsigned char src2 = vec_ld(stride * i + 15, src); \
439  register vector unsigned char srcO = \
440  vec_perm(src1, src2, vec_lvsl(stride * i, src)); \
441  register vector unsigned char dst1 = vec_ld(stride * i, dst); \
442  register vector unsigned char dst2 = vec_ld(stride * i + 15, dst); \
443  register vector unsigned char dstO = \
444  vec_perm(dst1, dst2, vec_lvsl(stride * i, dst)); \
445  \
446  /* Promote the unsigned chars to signed shorts. */ \
447  /* We're in the 8x8 function, we only care for the first 8. */ \
448  register vector signed short srcV = \
449  (vector signed short) vec_mergeh((vector signed char) vzero, \
450  (vector signed char) srcO); \
451  register vector signed short dstV = \
452  (vector signed short) vec_mergeh((vector signed char) vzero, \
453  (vector signed char) dstO); \
454  \
455  /* subtractions inside the first butterfly */ \
456  register vector signed short but0 = vec_sub(srcV, dstV); \
457  register vector signed short op1 = vec_perm(but0, but0, perm1); \
458  register vector signed short but1 = vec_mladd(but0, vprod1, op1); \
459  register vector signed short op2 = vec_perm(but1, but1, perm2); \
460  register vector signed short but2 = vec_mladd(but1, vprod2, op2); \
461  register vector signed short op3 = vec_perm(but2, but2, perm3); \
462  res = vec_mladd(but2, vprod3, op3); \
463  }
464  ONEITERBUTTERFLY(0, temp0);
465  ONEITERBUTTERFLY(1, temp1);
466  ONEITERBUTTERFLY(2, temp2);
467  ONEITERBUTTERFLY(3, temp3);
468  ONEITERBUTTERFLY(4, temp4);
469  ONEITERBUTTERFLY(5, temp5);
470  ONEITERBUTTERFLY(6, temp6);
471  ONEITERBUTTERFLY(7, temp7);
472  }
473 #undef ONEITERBUTTERFLY
474  {
475  register vector signed int vsum;
476  register vector signed short line0 = vec_add(temp0, temp1);
477  register vector signed short line1 = vec_sub(temp0, temp1);
478  register vector signed short line2 = vec_add(temp2, temp3);
479  register vector signed short line3 = vec_sub(temp2, temp3);
480  register vector signed short line4 = vec_add(temp4, temp5);
481  register vector signed short line5 = vec_sub(temp4, temp5);
482  register vector signed short line6 = vec_add(temp6, temp7);
483  register vector signed short line7 = vec_sub(temp6, temp7);
484 
485  register vector signed short line0B = vec_add(line0, line2);
486  register vector signed short line2B = vec_sub(line0, line2);
487  register vector signed short line1B = vec_add(line1, line3);
488  register vector signed short line3B = vec_sub(line1, line3);
489  register vector signed short line4B = vec_add(line4, line6);
490  register vector signed short line6B = vec_sub(line4, line6);
491  register vector signed short line5B = vec_add(line5, line7);
492  register vector signed short line7B = vec_sub(line5, line7);
493 
494  register vector signed short line0C = vec_add(line0B, line4B);
495  register vector signed short line4C = vec_sub(line0B, line4B);
496  register vector signed short line1C = vec_add(line1B, line5B);
497  register vector signed short line5C = vec_sub(line1B, line5B);
498  register vector signed short line2C = vec_add(line2B, line6B);
499  register vector signed short line6C = vec_sub(line2B, line6B);
500  register vector signed short line3C = vec_add(line3B, line7B);
501  register vector signed short line7C = vec_sub(line3B, line7B);
502 
503  vsum = vec_sum4s(vec_abs(line0C), vec_splat_s32(0));
504  vsum = vec_sum4s(vec_abs(line1C), vsum);
505  vsum = vec_sum4s(vec_abs(line2C), vsum);
506  vsum = vec_sum4s(vec_abs(line3C), vsum);
507  vsum = vec_sum4s(vec_abs(line4C), vsum);
508  vsum = vec_sum4s(vec_abs(line5C), vsum);
509  vsum = vec_sum4s(vec_abs(line6C), vsum);
510  vsum = vec_sum4s(vec_abs(line7C), vsum);
511  vsum = vec_sums(vsum, (vector signed int) vzero);
512  vsum = vec_splat(vsum, 3);
513  vec_ste(vsum, 0, &sum);
514  }
515  return sum;
516 }
517 
518 /*
519  * 16x8 works with 16 elements; it allows to avoid replicating loads, and
520  * gives the compiler more room for scheduling. It's only used from
521  * inside hadamard8_diff16_altivec.
522  *
523  * Unfortunately, it seems gcc-3.3 is a bit dumb, and the compiled code has
524  * a LOT of spill code, it seems gcc (unlike xlc) cannot keep everything in
525  * registers by itself. The following code includes hand-made register
526  * allocation. It's not clean, but on a 7450 the resulting code is much faster
527  * (best case falls from 700+ cycles to 550).
528  *
529  * xlc doesn't add spill code, but it doesn't know how to schedule for the
530  * 7450, and its code isn't much faster than gcc-3.3 on the 7450 (but uses
531  * 25% fewer instructions...)
532  *
533  * On the 970, the hand-made RA is still a win (around 690 vs. around 780),
534  * but xlc goes to around 660 on the regular C code...
535  */
536 static int hadamard8_diff16x8_altivec(MpegEncContext *s, uint8_t *dst,
537  uint8_t *src, int stride, int h)
538 {
539  int sum;
540  register vector signed short
541  temp0 __asm__ ("v0"),
542  temp1 __asm__ ("v1"),
543  temp2 __asm__ ("v2"),
544  temp3 __asm__ ("v3"),
545  temp4 __asm__ ("v4"),
546  temp5 __asm__ ("v5"),
547  temp6 __asm__ ("v6"),
548  temp7 __asm__ ("v7");
549  register vector signed short
550  temp0S __asm__ ("v8"),
551  temp1S __asm__ ("v9"),
552  temp2S __asm__ ("v10"),
553  temp3S __asm__ ("v11"),
554  temp4S __asm__ ("v12"),
555  temp5S __asm__ ("v13"),
556  temp6S __asm__ ("v14"),
557  temp7S __asm__ ("v15");
558  register const vector unsigned char vzero __asm__ ("v31") =
559  (const vector unsigned char) vec_splat_u8(0);
560  {
561  register const vector signed short vprod1 __asm__ ("v16") =
562  (const vector signed short) { 1, -1, 1, -1, 1, -1, 1, -1 };
563 
564  register const vector signed short vprod2 __asm__ ("v17") =
565  (const vector signed short) { 1, 1, -1, -1, 1, 1, -1, -1 };
566 
567  register const vector signed short vprod3 __asm__ ("v18") =
568  (const vector signed short) { 1, 1, 1, 1, -1, -1, -1, -1 };
569 
570  register const vector unsigned char perm1 __asm__ ("v19") =
571  (const vector unsigned char)
572  { 0x02, 0x03, 0x00, 0x01, 0x06, 0x07, 0x04, 0x05,
573  0x0A, 0x0B, 0x08, 0x09, 0x0E, 0x0F, 0x0C, 0x0D };
574 
575  register const vector unsigned char perm2 __asm__ ("v20") =
576  (const vector unsigned char)
577  { 0x04, 0x05, 0x06, 0x07, 0x00, 0x01, 0x02, 0x03,
578  0x0C, 0x0D, 0x0E, 0x0F, 0x08, 0x09, 0x0A, 0x0B };
579 
580  register const vector unsigned char perm3 __asm__ ("v21") =
581  (const vector unsigned char)
582  { 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
583  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 };
584 
585 #define ONEITERBUTTERFLY(i, res1, res2) \
586  { \
587  register vector unsigned char src1 __asm__ ("v22") = \
588  vec_ld(stride * i, src); \
589  register vector unsigned char src2 __asm__ ("v23") = \
590  vec_ld(stride * i + 16, src); \
591  register vector unsigned char srcO __asm__ ("v22") = \
592  vec_perm(src1, src2, vec_lvsl(stride * i, src)); \
593  register vector unsigned char dst1 __asm__ ("v24") = \
594  vec_ld(stride * i, dst); \
595  register vector unsigned char dst2 __asm__ ("v25") = \
596  vec_ld(stride * i + 16, dst); \
597  register vector unsigned char dstO __asm__ ("v23") = \
598  vec_perm(dst1, dst2, vec_lvsl(stride * i, dst)); \
599  \
600  /* Promote the unsigned chars to signed shorts. */ \
601  register vector signed short srcV __asm__ ("v24") = \
602  (vector signed short) vec_mergeh((vector signed char) vzero, \
603  (vector signed char) srcO); \
604  register vector signed short dstV __asm__ ("v25") = \
605  (vector signed short) vec_mergeh((vector signed char) vzero, \
606  (vector signed char) dstO); \
607  register vector signed short srcW __asm__ ("v26") = \
608  (vector signed short) vec_mergel((vector signed char) vzero, \
609  (vector signed char) srcO); \
610  register vector signed short dstW __asm__ ("v27") = \
611  (vector signed short) vec_mergel((vector signed char) vzero, \
612  (vector signed char) dstO); \
613  \
614  /* subtractions inside the first butterfly */ \
615  register vector signed short but0 __asm__ ("v28") = \
616  vec_sub(srcV, dstV); \
617  register vector signed short but0S __asm__ ("v29") = \
618  vec_sub(srcW, dstW); \
619  register vector signed short op1 __asm__ ("v30") = \
620  vec_perm(but0, but0, perm1); \
621  register vector signed short but1 __asm__ ("v22") = \
622  vec_mladd(but0, vprod1, op1); \
623  register vector signed short op1S __asm__ ("v23") = \
624  vec_perm(but0S, but0S, perm1); \
625  register vector signed short but1S __asm__ ("v24") = \
626  vec_mladd(but0S, vprod1, op1S); \
627  register vector signed short op2 __asm__ ("v25") = \
628  vec_perm(but1, but1, perm2); \
629  register vector signed short but2 __asm__ ("v26") = \
630  vec_mladd(but1, vprod2, op2); \
631  register vector signed short op2S __asm__ ("v27") = \
632  vec_perm(but1S, but1S, perm2); \
633  register vector signed short but2S __asm__ ("v28") = \
634  vec_mladd(but1S, vprod2, op2S); \
635  register vector signed short op3 __asm__ ("v29") = \
636  vec_perm(but2, but2, perm3); \
637  register vector signed short op3S __asm__ ("v30") = \
638  vec_perm(but2S, but2S, perm3); \
639  res1 = vec_mladd(but2, vprod3, op3); \
640  res2 = vec_mladd(but2S, vprod3, op3S); \
641  }
642  ONEITERBUTTERFLY(0, temp0, temp0S);
643  ONEITERBUTTERFLY(1, temp1, temp1S);
644  ONEITERBUTTERFLY(2, temp2, temp2S);
645  ONEITERBUTTERFLY(3, temp3, temp3S);
646  ONEITERBUTTERFLY(4, temp4, temp4S);
647  ONEITERBUTTERFLY(5, temp5, temp5S);
648  ONEITERBUTTERFLY(6, temp6, temp6S);
649  ONEITERBUTTERFLY(7, temp7, temp7S);
650  }
651 #undef ONEITERBUTTERFLY
652  {
653  register vector signed int vsum;
654 
655  register vector signed short line0 = vec_add(temp0, temp1);
656  register vector signed short line1 = vec_sub(temp0, temp1);
657  register vector signed short line2 = vec_add(temp2, temp3);
658  register vector signed short line3 = vec_sub(temp2, temp3);
659  register vector signed short line4 = vec_add(temp4, temp5);
660  register vector signed short line5 = vec_sub(temp4, temp5);
661  register vector signed short line6 = vec_add(temp6, temp7);
662  register vector signed short line7 = vec_sub(temp6, temp7);
663 
664  register vector signed short line0B = vec_add(line0, line2);
665  register vector signed short line2B = vec_sub(line0, line2);
666  register vector signed short line1B = vec_add(line1, line3);
667  register vector signed short line3B = vec_sub(line1, line3);
668  register vector signed short line4B = vec_add(line4, line6);
669  register vector signed short line6B = vec_sub(line4, line6);
670  register vector signed short line5B = vec_add(line5, line7);
671  register vector signed short line7B = vec_sub(line5, line7);
672 
673  register vector signed short line0C = vec_add(line0B, line4B);
674  register vector signed short line4C = vec_sub(line0B, line4B);
675  register vector signed short line1C = vec_add(line1B, line5B);
676  register vector signed short line5C = vec_sub(line1B, line5B);
677  register vector signed short line2C = vec_add(line2B, line6B);
678  register vector signed short line6C = vec_sub(line2B, line6B);
679  register vector signed short line3C = vec_add(line3B, line7B);
680  register vector signed short line7C = vec_sub(line3B, line7B);
681 
682  register vector signed short line0S = vec_add(temp0S, temp1S);
683  register vector signed short line1S = vec_sub(temp0S, temp1S);
684  register vector signed short line2S = vec_add(temp2S, temp3S);
685  register vector signed short line3S = vec_sub(temp2S, temp3S);
686  register vector signed short line4S = vec_add(temp4S, temp5S);
687  register vector signed short line5S = vec_sub(temp4S, temp5S);
688  register vector signed short line6S = vec_add(temp6S, temp7S);
689  register vector signed short line7S = vec_sub(temp6S, temp7S);
690 
691  register vector signed short line0BS = vec_add(line0S, line2S);
692  register vector signed short line2BS = vec_sub(line0S, line2S);
693  register vector signed short line1BS = vec_add(line1S, line3S);
694  register vector signed short line3BS = vec_sub(line1S, line3S);
695  register vector signed short line4BS = vec_add(line4S, line6S);
696  register vector signed short line6BS = vec_sub(line4S, line6S);
697  register vector signed short line5BS = vec_add(line5S, line7S);
698  register vector signed short line7BS = vec_sub(line5S, line7S);
699 
700  register vector signed short line0CS = vec_add(line0BS, line4BS);
701  register vector signed short line4CS = vec_sub(line0BS, line4BS);
702  register vector signed short line1CS = vec_add(line1BS, line5BS);
703  register vector signed short line5CS = vec_sub(line1BS, line5BS);
704  register vector signed short line2CS = vec_add(line2BS, line6BS);
705  register vector signed short line6CS = vec_sub(line2BS, line6BS);
706  register vector signed short line3CS = vec_add(line3BS, line7BS);
707  register vector signed short line7CS = vec_sub(line3BS, line7BS);
708 
709  vsum = vec_sum4s(vec_abs(line0C), vec_splat_s32(0));
710  vsum = vec_sum4s(vec_abs(line1C), vsum);
711  vsum = vec_sum4s(vec_abs(line2C), vsum);
712  vsum = vec_sum4s(vec_abs(line3C), vsum);
713  vsum = vec_sum4s(vec_abs(line4C), vsum);
714  vsum = vec_sum4s(vec_abs(line5C), vsum);
715  vsum = vec_sum4s(vec_abs(line6C), vsum);
716  vsum = vec_sum4s(vec_abs(line7C), vsum);
717 
718  vsum = vec_sum4s(vec_abs(line0CS), vsum);
719  vsum = vec_sum4s(vec_abs(line1CS), vsum);
720  vsum = vec_sum4s(vec_abs(line2CS), vsum);
721  vsum = vec_sum4s(vec_abs(line3CS), vsum);
722  vsum = vec_sum4s(vec_abs(line4CS), vsum);
723  vsum = vec_sum4s(vec_abs(line5CS), vsum);
724  vsum = vec_sum4s(vec_abs(line6CS), vsum);
725  vsum = vec_sum4s(vec_abs(line7CS), vsum);
726  vsum = vec_sums(vsum, (vector signed int) vzero);
727  vsum = vec_splat(vsum, 3);
728  vec_ste(vsum, 0, &sum);
729  }
730  return sum;
731 }
732 
733 static int hadamard8_diff16_altivec(MpegEncContext *s, uint8_t *dst,
734  uint8_t *src, int stride, int h)
735 {
736  int score = hadamard8_diff16x8_altivec(s, dst, src, stride, 8);
737 
738  if (h == 16) {
739  dst += 8 * stride;
740  src += 8 * stride;
741  score += hadamard8_diff16x8_altivec(s, dst, src, stride, 8);
742  }
743  return score;
744 }
745 #endif /* HAVE_ALTIVEC */
746 
747 av_cold void ff_dsputil_init_ppc(DSPContext *c, AVCodecContext *avctx)
748 {
749 #if HAVE_ALTIVEC
750  if (!PPC_ALTIVEC(av_get_cpu_flags()))
751  return;
752 
753  c->pix_abs[0][1] = sad16_x2_altivec;
754  c->pix_abs[0][2] = sad16_y2_altivec;
755  c->pix_abs[0][3] = sad16_xy2_altivec;
756  c->pix_abs[0][0] = sad16_altivec;
757  c->pix_abs[1][0] = sad8_altivec;
758 
759  c->sad[0] = sad16_altivec;
760  c->sad[1] = sad8_altivec;
761  c->sse[0] = sse16_altivec;
762  c->sse[1] = sse8_altivec;
763 
764  c->hadamard8_diff[0] = hadamard8_diff16_altivec;
765  c->hadamard8_diff[1] = hadamard8_diff8x8_altivec;
766 #endif /* HAVE_ALTIVEC */
767 }
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