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FFmpeg/libavcodec/ppc/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 Libav.

  7.  *

  8.  * Libav 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.  * Libav 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 Libav; 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(15, pix1);

  290.         vector unsigned char pix2l = vec_ld( 0, pix2);

  291.         vector unsigned char pix2r = vec_ld(15, 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(15, pix1);

  372.         vector unsigned char pix2l = vec_ld( 0, pix2);

  373.         vector unsigned char pix2r = vec_ld(15, 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(15, 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. }