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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. 

  28. #include "libavutil/attributes.h"

  29. #include "libavutil/ppc/types_altivec.h"

  30. #include "libavutil/ppc/util_altivec.h"

  31. #include "libavcodec/avcodec.h"

  32. #include "libavcodec/dsputil.h"

  33. #include "libavcodec/mpegvideo.h"

  34. #include "dsputil_altivec.h"

  35. 

  36. static int sad16_x2_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,

  37.                             int line_size, int h)

  38. {

  39.     int i, s = 0;

  40.     const vector unsigned char zero =

  41.         (const vector unsigned char) vec_splat_u8(0);

  42.     vector unsigned char perm1 = vec_lvsl(0, pix2);

  43.     vector unsigned char perm2 = vec_add(perm1, vec_splat_u8(1));

  44.     vector unsigned int sad = (vector unsigned int) vec_splat_u32(0);

  45.     vector signed int sumdiffs;

  46. 

  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.         vector unsigned char pix1v  = vec_ld(0,  pix1);

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

  53.         vector unsigned char pix2r  = vec_ld(16, pix2);

  54.         vector unsigned char pix2v  = vec_perm(pix2l, pix2r, perm1);

  55.         vector unsigned char pix2iv = vec_perm(pix2l, pix2r, perm2);

  56. 

  57.         /* Calculate the average vector. */

  58.         vector unsigned char avgv = vec_avg(pix2v, pix2iv);

  59. 

  60.         /* Calculate a sum of abs differences vector. */

  61.         vector unsigned char t5 = vec_sub(vec_max(pix1v, avgv),

  62.                                           vec_min(pix1v, avgv));

  63. 

  64.         /* Add each 4 pixel group together and put 4 results into sad. */

  65.         sad = vec_sum4s(t5, sad);

  66. 

  67.         pix1 += line_size;

  68.         pix2 += line_size;

  69.     }

  70.     /* Sum up the four partial sums, and put the result into s. */

  71.     sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);

  72.     sumdiffs = vec_splat(sumdiffs, 3);

  73.     vec_ste(sumdiffs, 0, &s);

  74. 

  75.     return s;

  76. }

  77. 

  78. static int sad16_y2_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,

  79.                             int line_size, int h)

  80. {

  81.     int i, s = 0;

  82.     const vector unsigned char zero =

  83.         (const vector unsigned char) vec_splat_u8(0);

  84.     vector unsigned char perm = vec_lvsl(0, pix2);

  85.     vector unsigned char pix1v, pix3v, avgv, t5;

  86.     vector unsigned int sad = (vector unsigned int) vec_splat_u32(0);

  87.     vector signed int sumdiffs;

  88.     uint8_t *pix3 = pix2 + line_size;

  89. 

  90.     /* Due to the fact that pix3 = pix2 + line_size, the pix3 of one

  91.      * iteration becomes pix2 in the next iteration. We can use this

  92.      * fact to avoid a potentially expensive unaligned read, each

  93.      * time around the loop.

  94.      * Read unaligned pixels into our vectors. The vectors are as follows:

  95.      * pix2v: pix2[0] - pix2[15]

  96.      * Split the pixel vectors into shorts. */

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

  98.     vector unsigned char pix2r = vec_ld(15, pix2);

  99.     vector unsigned char pix2v = vec_perm(pix2l, pix2r, perm);

  100. 

  101.     for (i = 0; i < h; i++) {

  102.         /* Read unaligned pixels into our vectors. The vectors are as follows:

  103.          * pix1v: pix1[0] - pix1[15]

  104.          * pix3v: pix3[0] - pix3[15] */

  105.         pix1v = vec_ld(0,  pix1);

  106. 

  107.         pix2l = vec_ld(0,  pix3);

  108.         pix2r = vec_ld(15, pix3);

  109.         pix3v = vec_perm(pix2l, pix2r, perm);

  110. 

  111.         /* Calculate the average vector. */

  112.         avgv = vec_avg(pix2v, pix3v);

  113. 

  114.         /* Calculate a sum of abs differences vector. */

  115.         t5 = vec_sub(vec_max(pix1v, avgv), vec_min(pix1v, avgv));

  116. 

  117.         /* Add each 4 pixel group together and put 4 results into sad. */

  118.         sad = vec_sum4s(t5, sad);

  119. 

  120.         pix1 += line_size;

  121.         pix2v = pix3v;

  122.         pix3 += line_size;

  123.     }

  124. 

  125.     /* Sum up the four partial sums, and put the result into s. */

  126.     sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);

  127.     sumdiffs = vec_splat(sumdiffs, 3);

  128.     vec_ste(sumdiffs, 0, &s);

  129.     return s;

  130. }

  131. 

  132. static int sad16_xy2_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,

  133.                              int line_size, int h)

  134. {

  135.     int i, s = 0;

  136.     uint8_t *pix3 = pix2 + line_size;

  137.     const vector unsigned char zero =

  138.         (const vector unsigned char) vec_splat_u8(0);

  139.     const vector unsigned short two =

  140.         (const vector unsigned short) vec_splat_u16(2);

  141.     vector unsigned char avgv, t5;

  142.     vector unsigned char perm1 = vec_lvsl(0, pix2);

  143.     vector unsigned char perm2 = vec_add(perm1, vec_splat_u8(1));

  144.     vector unsigned char pix1v, pix3v, pix3iv;

  145.     vector unsigned short pix3lv, pix3hv, pix3ilv, pix3ihv;

  146.     vector unsigned short avghv, avglv;

  147.     vector unsigned int sad = (vector unsigned int) vec_splat_u32(0);

  148.     vector signed int sumdiffs;

  149. 

  150.     /* Due to the fact that pix3 = pix2 + line_size, the pix3 of one

  151.      * iteration becomes pix2 in the next iteration. We can use this

  152.      * fact to avoid a potentially expensive unaligned read, as well

  153.      * as some splitting, and vector addition each time around the loop.

  154.      * Read unaligned pixels into our vectors. The vectors are as follows:

  155.      * pix2v: pix2[0] - pix2[15]  pix2iv: pix2[1] - pix2[16]

  156.      * Split the pixel vectors into shorts. */

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

  158.     vector unsigned char pix2r  = vec_ld(16, pix2);

  159.     vector unsigned char pix2v  = vec_perm(pix2l, pix2r, perm1);

  160.     vector unsigned char pix2iv = vec_perm(pix2l, pix2r, perm2);

  161. 

  162.     vector unsigned short pix2hv  =

  163.         (vector unsigned short) vec_mergeh(zero, pix2v);

  164.     vector unsigned short pix2lv  =

  165.         (vector unsigned short) vec_mergel(zero, pix2v);

  166.     vector unsigned short pix2ihv =

  167.         (vector unsigned short) vec_mergeh(zero, pix2iv);

  168.     vector unsigned short pix2ilv =

  169.         (vector unsigned short) vec_mergel(zero, pix2iv);

  170.     vector unsigned short t1 = vec_add(pix2hv, pix2ihv);

  171.     vector unsigned short t2 = vec_add(pix2lv, pix2ilv);

  172.     vector unsigned short t3, t4;

  173. 

  174.     for (i = 0; i < h; i++) {

  175.         /* Read unaligned pixels into our vectors. The vectors are as follows:

  176.          * pix1v: pix1[0] - pix1[15]

  177.          * pix3v: pix3[0] - pix3[15]      pix3iv: pix3[1] - pix3[16] */

  178.         pix1v  = vec_ld(0, pix1);

  179. 

  180.         pix2l  = vec_ld(0, pix3);

  181.         pix2r  = vec_ld(16, pix3);

  182.         pix3v  = vec_perm(pix2l, pix2r, perm1);

  183.         pix3iv = vec_perm(pix2l, pix2r, perm2);

  184. 

  185.         /* Note that AltiVec does have vec_avg, but this works on vector pairs

  186.          * and rounds up. We could do avg(avg(a, b), avg(c, d)), but the

  187.          * rounding would mean that, for example, avg(3, 0, 0, 1) = 2, when

  188.          * it should be 1. Instead, we have to split the pixel vectors into

  189.          * vectors of shorts and do the averaging by hand. */

  190. 

  191.         /* Split the pixel vectors into shorts. */

  192.         pix3hv  = (vector unsigned short) vec_mergeh(zero, pix3v);

  193.         pix3lv  = (vector unsigned short) vec_mergel(zero, pix3v);

  194.         pix3ihv = (vector unsigned short) vec_mergeh(zero, pix3iv);

  195.         pix3ilv = (vector unsigned short) vec_mergel(zero, pix3iv);

  196. 

  197.         /* Do the averaging on them. */

  198.         t3 = vec_add(pix3hv, pix3ihv);

  199.         t4 = vec_add(pix3lv, pix3ilv);

  200. 

  201.         avghv = vec_sr(vec_add(vec_add(t1, t3), two), two);

  202.         avglv = vec_sr(vec_add(vec_add(t2, t4), two), two);

  203. 

  204.         /* Pack the shorts back into a result. */

  205.         avgv = vec_pack(avghv, avglv);

  206. 

  207.         /* Calculate a sum of abs differences vector. */

  208.         t5 = vec_sub(vec_max(pix1v, avgv), vec_min(pix1v, avgv));

  209. 

  210.         /* Add each 4 pixel group together and put 4 results into sad. */

  211.         sad = vec_sum4s(t5, sad);

  212. 

  213.         pix1 += line_size;

  214.         pix3 += line_size;

  215.         /* Transfer the calculated values for pix3 into pix2. */

  216.         t1 = t3;

  217.         t2 = t4;

  218.     }

  219.     /* Sum up the four partial sums, and put the result into s. */

  220.     sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);

  221.     sumdiffs = vec_splat(sumdiffs, 3);

  222.     vec_ste(sumdiffs, 0, &s);

  223. 

  224.     return s;

  225. }

  226. 

  227. static int sad16_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,

  228.                          int line_size, int h)

  229. {

  230.     int i, s;

  231.     const vector unsigned int zero =

  232.         (const vector unsigned int) vec_splat_u32(0);

  233.     vector unsigned char perm = vec_lvsl(0, pix2);

  234.     vector unsigned int sad = (vector unsigned int) vec_splat_u32(0);

  235.     vector signed int sumdiffs;

  236. 

  237.     for (i = 0; i < h; i++) {

  238.         /* Read potentially unaligned pixels into t1 and t2. */

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

  240.         vector unsigned char pix2r = vec_ld(15, pix2);

  241.         vector unsigned char t1 = vec_ld(0, pix1);

  242.         vector unsigned char t2 = vec_perm(pix2l, pix2r, perm);

  243. 

  244.         /* Calculate a sum of abs differences vector. */

  245.         vector unsigned char t3 = vec_max(t1, t2);

  246.         vector unsigned char t4 = vec_min(t1, t2);

  247.         vector unsigned char t5 = vec_sub(t3, t4);

  248. 

  249.         /* Add each 4 pixel group together and put 4 results into sad. */

  250.         sad = vec_sum4s(t5, sad);

  251. 

  252.         pix1 += line_size;

  253.         pix2 += line_size;

  254.     }

  255. 

  256.     /* Sum up the four partial sums, and put the result into s. */

  257.     sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);

  258.     sumdiffs = vec_splat(sumdiffs, 3);

  259.     vec_ste(sumdiffs, 0, &s);

  260. 

  261.     return s;

  262. }

  263. 

  264. static int sad8_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,

  265.                         int line_size, int h)

  266. {

  267.     int i, s;

  268.     const vector unsigned int zero =

  269.         (const vector unsigned int) vec_splat_u32(0);

  270.     const vector unsigned char permclear =

  271.         (vector unsigned char)

  272.         { 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 0, 0, 0, 0 };

  273.     vector unsigned char perm1 = vec_lvsl(0, pix1);

  274.     vector unsigned char perm2 = vec_lvsl(0, pix2);

  275.     vector unsigned int sad = (vector unsigned int) vec_splat_u32(0);

  276.     vector signed int sumdiffs;

  277. 

  278.     for (i = 0; i < h; i++) {

  279.         /* Read potentially unaligned pixels into t1 and t2.

  280.          * Since we're reading 16 pixels, and actually only want 8,

  281.          * mask out the last 8 pixels. The 0s don't change the sum. */

  282.         vector unsigned char pix1l = vec_ld(0, pix1);

  283.         vector unsigned char pix1r = vec_ld(7, pix1);

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

  285.         vector unsigned char pix2r = vec_ld(7, pix2);

  286.         vector unsigned char t1 = vec_and(vec_perm(pix1l, pix1r, perm1),

  287.                                           permclear);

  288.         vector unsigned char t2 = vec_and(vec_perm(pix2l, pix2r, perm2),

  289.                                           permclear);

  290. 

  291.         /* Calculate a sum of abs differences vector. */

  292.         vector unsigned char t3 = vec_max(t1, t2);

  293.         vector unsigned char t4 = vec_min(t1, t2);

  294.         vector unsigned char t5 = vec_sub(t3, t4);

  295. 

  296.         /* Add each 4 pixel group together and put 4 results into sad. */

  297.         sad = vec_sum4s(t5, sad);

  298. 

  299.         pix1 += line_size;

  300.         pix2 += line_size;

  301.     }

  302. 

  303.     /* Sum up the four partial sums, and put the result into s. */

  304.     sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);

  305.     sumdiffs = vec_splat(sumdiffs, 3);

  306.     vec_ste(sumdiffs, 0, &s);

  307. 

  308.     return s;

  309. }

  310. 

  311. static int pix_norm1_altivec(uint8_t *pix, int line_size)

  312. {

  313.     int i, s = 0;

  314.     const vector unsigned int zero =

  315.         (const vector unsigned int) vec_splat_u32(0);

  316.     vector unsigned char perm = vec_lvsl(0, pix);

  317.     vector unsigned int sv = (vector unsigned int) vec_splat_u32(0);

  318.     vector signed int sum;

  319. 

  320.     for (i = 0; i < 16; i++) {

  321.         /* Read the potentially unaligned pixels. */

  322.         vector unsigned char pixl = vec_ld(0,  pix);

  323.         vector unsigned char pixr = vec_ld(15, pix);

  324.         vector unsigned char pixv = vec_perm(pixl, pixr, perm);

  325. 

  326.         /* Square the values, and add them to our sum. */

  327.         sv = vec_msum(pixv, pixv, sv);

  328. 

  329.         pix += line_size;

  330.     }

  331.     /* Sum up the four partial sums, and put the result into s. */

  332.     sum = vec_sums((vector signed int) sv, (vector signed int) zero);

  333.     sum = vec_splat(sum, 3);

  334.     vec_ste(sum, 0, &s);

  335. 

  336.     return s;

  337. }

  338. 

  339. /* Sum of Squared Errors for an 8x8 block, AltiVec-enhanced.

  340.  * It's the sad8_altivec code above w/ squaring added. */

  341. static int sse8_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,

  342.                         int line_size, int h)

  343. {

  344.     int i, s;

  345.     const vector unsigned int zero =

  346.         (const vector unsigned int) vec_splat_u32(0);

  347.     const vector unsigned char permclear =

  348.         (vector unsigned char)

  349.         { 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 0, 0, 0, 0 };

  350.     vector unsigned char perm1 = vec_lvsl(0, pix1);

  351.     vector unsigned char perm2 = vec_lvsl(0, pix2);

  352.     vector unsigned int sum = (vector unsigned int) vec_splat_u32(0);

  353.     vector signed int sumsqr;

  354. 

  355.     for (i = 0; i < h; i++) {

  356.         /* Read potentially unaligned pixels into t1 and t2.

  357.          * Since we're reading 16 pixels, and actually only want 8,

  358.          * mask out the last 8 pixels. The 0s don't change the sum. */

  359.         vector unsigned char pix1l = vec_ld(0, pix1);

  360.         vector unsigned char pix1r = vec_ld(7, pix1);

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

  362.         vector unsigned char pix2r = vec_ld(7, pix2);

  363.         vector unsigned char t1 = vec_and(vec_perm(pix1l, pix1r, perm1),

  364.                                           permclear);

  365.         vector unsigned char t2 = vec_and(vec_perm(pix2l, pix2r, perm2),

  366.                                           permclear);

  367. 

  368.         /* Since we want to use unsigned chars, we can take advantage

  369.          * of the fact that abs(a - b) ^ 2 = (a - b) ^ 2. */

  370. 

  371.         /* Calculate abs differences vector. */

  372.         vector unsigned char t3 = vec_max(t1, t2);

  373.         vector unsigned char t4 = vec_min(t1, t2);

  374.         vector unsigned char t5 = vec_sub(t3, t4);

  375. 

  376.         /* Square the values and add them to our sum. */

  377.         sum = vec_msum(t5, t5, sum);

  378. 

  379.         pix1 += line_size;

  380.         pix2 += line_size;

  381.     }

  382. 

  383.     /* Sum up the four partial sums, and put the result into s. */

  384.     sumsqr = vec_sums((vector signed int) sum, (vector signed int) zero);

  385.     sumsqr = vec_splat(sumsqr, 3);

  386.     vec_ste(sumsqr, 0, &s);

  387. 

  388.     return s;

  389. }

  390. 

  391. /* Sum of Squared Errors for a 16x16 block, AltiVec-enhanced.

  392.  * It's the sad16_altivec code above w/ squaring added. */

  393. static int sse16_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,

  394.                          int line_size, int h)

  395. {

  396.     int i, s;

  397.     const vector unsigned int zero =

  398.         (const vector unsigned int) vec_splat_u32(0);

  399.     vector unsigned char perm = vec_lvsl(0, pix2);

  400.     vector unsigned int sum = (vector unsigned int) vec_splat_u32(0);

  401.     vector signed int sumsqr;

  402. 

  403.     for (i = 0; i < h; i++) {

  404.         /* Read potentially unaligned pixels into t1 and t2. */

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

  406.         vector unsigned char pix2r = vec_ld(15, pix2);

  407.         vector unsigned char t1 = vec_ld(0, pix1);

  408.         vector unsigned char t2 = vec_perm(pix2l, pix2r, perm);

  409. 

  410.         /* Since we want to use unsigned chars, we can take advantage

  411.          * of the fact that abs(a - b) ^ 2 = (a - b) ^ 2. */

  412. 

  413.         /* Calculate abs differences vector. */

  414.         vector unsigned char t3 = vec_max(t1, t2);

  415.         vector unsigned char t4 = vec_min(t1, t2);

  416.         vector unsigned char t5 = vec_sub(t3, t4);

  417. 

  418.         /* Square the values and add them to our sum. */

  419.         sum = vec_msum(t5, t5, sum);

  420. 

  421.         pix1 += line_size;

  422.         pix2 += line_size;

  423.     }

  424. 

  425.     /* Sum up the four partial sums, and put the result into s. */

  426.     sumsqr = vec_sums((vector signed int) sum, (vector signed int) zero);

  427.     sumsqr = vec_splat(sumsqr, 3);

  428.     vec_ste(sumsqr, 0, &s);

  429. 

  430.     return s;

  431. }

  432. 

  433. static int pix_sum_altivec(uint8_t *pix, int line_size)

  434. {

  435.     int i, s;

  436.     const vector unsigned int zero =

  437.         (const vector unsigned int) vec_splat_u32(0);

  438.     vector unsigned char perm = vec_lvsl(0, pix);

  439.     vector unsigned int sad = (vector unsigned int) vec_splat_u32(0);

  440.     vector signed int sumdiffs;

  441. 

  442.     for (i = 0; i < 16; i++) {

  443.         /* Read the potentially unaligned 16 pixels into t1. */

  444.         vector unsigned char pixl = vec_ld(0,  pix);

  445.         vector unsigned char pixr = vec_ld(15, pix);

  446.         vector unsigned char t1   = vec_perm(pixl, pixr, perm);

  447. 

  448.         /* Add each 4 pixel group together and put 4 results into sad. */

  449.         sad = vec_sum4s(t1, sad);

  450. 

  451.         pix += line_size;

  452.     }

  453. 

  454.     /* Sum up the four partial sums, and put the result into s. */

  455.     sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);

  456.     sumdiffs = vec_splat(sumdiffs, 3);

  457.     vec_ste(sumdiffs, 0, &s);

  458. 

  459.     return s;

  460. }

  461. 

  462. static void get_pixels_altivec(int16_t *restrict block, const uint8_t *pixels,

  463.                                int line_size)

  464. {

  465.     int i;

  466.     vector unsigned char perm = vec_lvsl(0, pixels);

  467.     const vector unsigned char zero =

  468.         (const vector unsigned char) vec_splat_u8(0);

  469. 

  470.     for (i = 0; i < 8; i++) {

  471.         /* Read potentially unaligned pixels.

  472.          * We're reading 16 pixels, and actually only want 8,

  473.          * but we simply ignore the extras. */

  474.         vector unsigned char pixl = vec_ld(0, pixels);

  475.         vector unsigned char pixr = vec_ld(7, pixels);

  476.         vector unsigned char bytes = vec_perm(pixl, pixr, perm);

  477. 

  478.         // Convert the bytes into shorts.

  479.         vector signed short shorts = (vector signed short) vec_mergeh(zero,

  480.                                                                       bytes);

  481. 

  482.         // Save the data to the block, we assume the block is 16-byte aligned.

  483.         vec_st(shorts, i * 16, (vector signed short *) block);

  484. 

  485.         pixels += line_size;

  486.     }

  487. }

  488. 

  489. static void diff_pixels_altivec(int16_t *restrict block, const uint8_t *s1,

  490.                                 const uint8_t *s2, int stride)

  491. {

  492.     int i;

  493.     vector unsigned char perm1 = vec_lvsl(0, s1);

  494.     vector unsigned char perm2 = vec_lvsl(0, s2);

  495.     const vector unsigned char zero =

  496.         (const vector unsigned char) vec_splat_u8(0);

  497.     vector signed short shorts1, shorts2;

  498. 

  499.     for (i = 0; i < 4; i++) {

  500.         /* Read potentially unaligned pixels.

  501.          * We're reading 16 pixels, and actually only want 8,

  502.          * but we simply ignore the extras. */

  503.         vector unsigned char pixl  = vec_ld(0,  s1);

  504.         vector unsigned char pixr  = vec_ld(15, s1);

  505.         vector unsigned char bytes = vec_perm(pixl, pixr, perm1);

  506. 

  507.         // Convert the bytes into shorts.

  508.         shorts1 = (vector signed short) vec_mergeh(zero, bytes);

  509. 

  510.         // Do the same for the second block of pixels.

  511.         pixl  = vec_ld(0,  s2);

  512.         pixr  = vec_ld(15, s2);

  513.         bytes = vec_perm(pixl, pixr, perm2);

  514. 

  515.         // Convert the bytes into shorts.

  516.         shorts2 = (vector signed short) vec_mergeh(zero, bytes);

  517. 

  518.         // Do the subtraction.

  519.         shorts1 = vec_sub(shorts1, shorts2);

  520. 

  521.         // Save the data to the block, we assume the block is 16-byte aligned.

  522.         vec_st(shorts1, 0, (vector signed short *) block);

  523. 

  524.         s1    += stride;

  525.         s2    += stride;

  526.         block += 8;

  527. 

  528.         /* The code below is a copy of the code above...

  529.          * This is a manual unroll. */

  530. 

  531.         /* Read potentially unaligned pixels.

  532.          * We're reading 16 pixels, and actually only want 8,

  533.          * but we simply ignore the extras. */

  534.         pixl  = vec_ld(0,  s1);

  535.         pixr  = vec_ld(15, s1);

  536.         bytes = vec_perm(pixl, pixr, perm1);

  537. 

  538.         // Convert the bytes into shorts.

  539.         shorts1 = (vector signed short) vec_mergeh(zero, bytes);

  540. 

  541.         // Do the same for the second block of pixels.

  542.         pixl  = vec_ld(0,  s2);

  543.         pixr  = vec_ld(15, s2);

  544.         bytes = vec_perm(pixl, pixr, perm2);

  545. 

  546.         // Convert the bytes into shorts.

  547.         shorts2 = (vector signed short) vec_mergeh(zero, bytes);

  548. 

  549.         // Do the subtraction.

  550.         shorts1 = vec_sub(shorts1, shorts2);

  551. 

  552.         // Save the data to the block, we assume the block is 16-byte aligned.

  553.         vec_st(shorts1, 0, (vector signed short *) block);

  554. 

  555.         s1    += stride;

  556.         s2    += stride;

  557.         block += 8;

  558.     }

  559. }

  560. 

  561. static void clear_block_altivec(int16_t *block)

  562. {

  563.     LOAD_ZERO;

  564.     vec_st(zero_s16v,   0, block);

  565.     vec_st(zero_s16v,  16, block);

  566.     vec_st(zero_s16v,  32, block);

  567.     vec_st(zero_s16v,  48, block);

  568.     vec_st(zero_s16v,  64, block);

  569.     vec_st(zero_s16v,  80, block);

  570.     vec_st(zero_s16v,  96, block);

  571.     vec_st(zero_s16v, 112, block);

  572. }

  573. 

  574. static int hadamard8_diff8x8_altivec(MpegEncContext *s, uint8_t *dst,

  575.                                      uint8_t *src, int stride, int h)

  576. {

  577.     int sum;

  578.     register const vector unsigned char vzero =

  579.         (const vector unsigned char) vec_splat_u8(0);

  580.     register vector signed short temp0, temp1, temp2, temp3, temp4,

  581.                                  temp5, temp6, temp7;

  582.     {

  583.         register const vector signed short vprod1 =

  584.             (const vector signed short) { 1, -1, 1, -1, 1, -1, 1, -1 };

  585.         register const vector signed short vprod2 =

  586.             (const vector signed short) { 1, 1, -1, -1, 1, 1, -1, -1 };

  587.         register const vector signed short vprod3 =

  588.             (const vector signed short) { 1, 1, 1, 1, -1, -1, -1, -1 };

  589.         register const vector unsigned char perm1 =

  590.             (const vector unsigned char)

  591.             { 0x02, 0x03, 0x00, 0x01, 0x06, 0x07, 0x04, 0x05,

  592.               0x0A, 0x0B, 0x08, 0x09, 0x0E, 0x0F, 0x0C, 0x0D };

  593.         register const vector unsigned char perm2 =

  594.             (const vector unsigned char)

  595.             { 0x04, 0x05, 0x06, 0x07, 0x00, 0x01, 0x02, 0x03,

  596.               0x0C, 0x0D, 0x0E, 0x0F, 0x08, 0x09, 0x0A, 0x0B };

  597.         register const vector unsigned char perm3 =

  598.             (const vector unsigned char)

  599.             { 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,

  600.               0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 };

  601. 

  602. #define ONEITERBUTTERFLY(i, res)                                            \

  603.     {                                                                       \

  604.         register vector unsigned char src1 = vec_ld(stride * i, src);       \

  605.         register vector unsigned char src2 = vec_ld(stride * i + 15, src);  \

  606.         register vector unsigned char srcO =                                \

  607.             vec_perm(src1, src2, vec_lvsl(stride * i, src));                \

  608.         register vector unsigned char dst1 = vec_ld(stride * i, dst);       \

  609.         register vector unsigned char dst2 = vec_ld(stride * i + 15, dst);  \

  610.         register vector unsigned char dstO =                                \

  611.             vec_perm(dst1, dst2, vec_lvsl(stride * i, dst));                \

  612.                                                                             \

  613.         /* Promote the unsigned chars to signed shorts. */                  \

  614.         /* We're in the 8x8 function, we only care for the first 8. */      \

  615.         register vector signed short srcV =                                 \

  616.             (vector signed short) vec_mergeh((vector signed char) vzero,    \

  617.                                              (vector signed char) srcO);    \

  618.         register vector signed short dstV =                                 \

  619.             (vector signed short) vec_mergeh((vector signed char) vzero,    \

  620.                                              (vector signed char) dstO);    \

  621.                                                                             \

  622.         /* subtractions inside the first butterfly */                       \

  623.         register vector signed short but0 = vec_sub(srcV, dstV);            \

  624.         register vector signed short op1  = vec_perm(but0, but0, perm1);    \

  625.         register vector signed short but1 = vec_mladd(but0, vprod1, op1);   \

  626.         register vector signed short op2  = vec_perm(but1, but1, perm2);    \

  627.         register vector signed short but2 = vec_mladd(but1, vprod2, op2);   \

  628.         register vector signed short op3  = vec_perm(but2, but2, perm3);    \

  629.         res  = vec_mladd(but2, vprod3, op3);                                \

  630.     }

  631.         ONEITERBUTTERFLY(0, temp0);

  632.         ONEITERBUTTERFLY(1, temp1);

  633.         ONEITERBUTTERFLY(2, temp2);

  634.         ONEITERBUTTERFLY(3, temp3);

  635.         ONEITERBUTTERFLY(4, temp4);

  636.         ONEITERBUTTERFLY(5, temp5);

  637.         ONEITERBUTTERFLY(6, temp6);

  638.         ONEITERBUTTERFLY(7, temp7);

  639.     }

  640. #undef ONEITERBUTTERFLY

  641.     {

  642.         register vector signed int vsum;

  643.         register vector signed short line0  = vec_add(temp0, temp1);

  644.         register vector signed short line1  = vec_sub(temp0, temp1);

  645.         register vector signed short line2  = vec_add(temp2, temp3);

  646.         register vector signed short line3  = vec_sub(temp2, temp3);

  647.         register vector signed short line4  = vec_add(temp4, temp5);

  648.         register vector signed short line5  = vec_sub(temp4, temp5);

  649.         register vector signed short line6  = vec_add(temp6, temp7);

  650.         register vector signed short line7  = vec_sub(temp6, temp7);

  651. 

  652.         register vector signed short line0B = vec_add(line0, line2);

  653.         register vector signed short line2B = vec_sub(line0, line2);

  654.         register vector signed short line1B = vec_add(line1, line3);

  655.         register vector signed short line3B = vec_sub(line1, line3);

  656.         register vector signed short line4B = vec_add(line4, line6);

  657.         register vector signed short line6B = vec_sub(line4, line6);

  658.         register vector signed short line5B = vec_add(line5, line7);

  659.         register vector signed short line7B = vec_sub(line5, line7);

  660. 

  661.         register vector signed short line0C = vec_add(line0B, line4B);

  662.         register vector signed short line4C = vec_sub(line0B, line4B);

  663.         register vector signed short line1C = vec_add(line1B, line5B);

  664.         register vector signed short line5C = vec_sub(line1B, line5B);

  665.         register vector signed short line2C = vec_add(line2B, line6B);

  666.         register vector signed short line6C = vec_sub(line2B, line6B);

  667.         register vector signed short line3C = vec_add(line3B, line7B);

  668.         register vector signed short line7C = vec_sub(line3B, line7B);

  669. 

  670.         vsum = vec_sum4s(vec_abs(line0C), vec_splat_s32(0));

  671.         vsum = vec_sum4s(vec_abs(line1C), vsum);

  672.         vsum = vec_sum4s(vec_abs(line2C), vsum);

  673.         vsum = vec_sum4s(vec_abs(line3C), vsum);

  674.         vsum = vec_sum4s(vec_abs(line4C), vsum);

  675.         vsum = vec_sum4s(vec_abs(line5C), vsum);

  676.         vsum = vec_sum4s(vec_abs(line6C), vsum);

  677.         vsum = vec_sum4s(vec_abs(line7C), vsum);

  678.         vsum = vec_sums(vsum, (vector signed int) vzero);

  679.         vsum = vec_splat(vsum, 3);

  680.         vec_ste(vsum, 0, &sum);

  681.     }

  682.     return sum;

  683. }

  684. 

  685. /*

  686.  * 16x8 works with 16 elements; it allows to avoid replicating loads, and

  687.  * gives the compiler more room for scheduling. It's only used from

  688.  * inside hadamard8_diff16_altivec.

  689.  *

  690.  * Unfortunately, it seems gcc-3.3 is a bit dumb, and the compiled code has

  691.  * a LOT of spill code, it seems gcc (unlike xlc) cannot keep everything in

  692.  * registers by itself. The following code includes hand-made register

  693.  * allocation. It's not clean, but on a 7450 the resulting code is much faster

  694.  * (best case falls from 700+ cycles to 550).

  695.  *

  696.  * xlc doesn't add spill code, but it doesn't know how to schedule for the

  697.  * 7450, and its code isn't much faster than gcc-3.3 on the 7450 (but uses

  698.  * 25% fewer instructions...)

  699.  *

  700.  * On the 970, the hand-made RA is still a win (around 690 vs. around 780),

  701.  * but xlc goes to around 660 on the regular C code...

  702.  */

  703. static int hadamard8_diff16x8_altivec(MpegEncContext *s, uint8_t *dst,

  704.                                       uint8_t *src, int stride, int h)

  705. {

  706.     int sum;

  707.     register vector signed short

  708.         temp0 __asm__ ("v0"),

  709.         temp1 __asm__ ("v1"),

  710.         temp2 __asm__ ("v2"),

  711.         temp3 __asm__ ("v3"),

  712.         temp4 __asm__ ("v4"),

  713.         temp5 __asm__ ("v5"),

  714.         temp6 __asm__ ("v6"),

  715.         temp7 __asm__ ("v7");

  716.     register vector signed short

  717.         temp0S __asm__ ("v8"),

  718.         temp1S __asm__ ("v9"),

  719.         temp2S __asm__ ("v10"),

  720.         temp3S __asm__ ("v11"),

  721.         temp4S __asm__ ("v12"),

  722.         temp5S __asm__ ("v13"),

  723.         temp6S __asm__ ("v14"),

  724.         temp7S __asm__ ("v15");

  725.     register const vector unsigned char vzero __asm__ ("v31") =

  726.         (const vector unsigned char) vec_splat_u8(0);

  727.     {

  728.         register const vector signed short vprod1 __asm__ ("v16") =

  729.             (const vector signed short) { 1, -1, 1, -1, 1, -1, 1, -1 };

  730. 

  731.         register const vector signed short vprod2 __asm__ ("v17") =

  732.             (const vector signed short) { 1, 1, -1, -1, 1, 1, -1, -1 };

  733. 

  734.         register const vector signed short vprod3 __asm__ ("v18") =

  735.             (const vector signed short) { 1, 1, 1, 1, -1, -1, -1, -1 };

  736. 

  737.         register const vector unsigned char perm1 __asm__ ("v19") =

  738.             (const vector unsigned char)

  739.             { 0x02, 0x03, 0x00, 0x01, 0x06, 0x07, 0x04, 0x05,

  740.               0x0A, 0x0B, 0x08, 0x09, 0x0E, 0x0F, 0x0C, 0x0D };

  741. 

  742.         register const vector unsigned char perm2 __asm__ ("v20") =

  743.             (const vector unsigned char)

  744.             { 0x04, 0x05, 0x06, 0x07, 0x00, 0x01, 0x02, 0x03,

  745.               0x0C, 0x0D, 0x0E, 0x0F, 0x08, 0x09, 0x0A, 0x0B };

  746. 

  747.         register const vector unsigned char perm3 __asm__ ("v21") =

  748.             (const vector unsigned char)

  749.             { 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,

  750.               0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 };

  751. 

  752. #define ONEITERBUTTERFLY(i, res1, res2)                                     \

  753.     {                                                                       \

  754.         register vector unsigned char src1 __asm__ ("v22") =                \

  755.             vec_ld(stride * i, src);                                        \

  756.         register vector unsigned char src2 __asm__ ("v23") =                \

  757.             vec_ld(stride * i + 16, src);                                   \

  758.         register vector unsigned char srcO __asm__ ("v22") =                \

  759.             vec_perm(src1, src2, vec_lvsl(stride * i, src));                \

  760.         register vector unsigned char dst1 __asm__ ("v24") =                \

  761.             vec_ld(stride * i, dst);                                        \

  762.         register vector unsigned char dst2 __asm__ ("v25") =                \

  763.             vec_ld(stride * i + 16, dst);                                   \

  764.         register vector unsigned char dstO __asm__ ("v23") =                \

  765.             vec_perm(dst1, dst2, vec_lvsl(stride * i, dst));                \

  766.                                                                             \

  767.         /* Promote the unsigned chars to signed shorts. */                  \

  768.         register vector signed short srcV __asm__ ("v24") =                 \

  769.             (vector signed short) vec_mergeh((vector signed char) vzero,    \

  770.                                              (vector signed char) srcO);    \

  771.         register vector signed short dstV __asm__ ("v25") =                 \

  772.             (vector signed short) vec_mergeh((vector signed char) vzero,    \

  773.                                              (vector signed char) dstO);    \

  774.         register vector signed short srcW __asm__ ("v26") =                 \

  775.             (vector signed short) vec_mergel((vector signed char) vzero,    \

  776.                                              (vector signed char) srcO);    \

  777.         register vector signed short dstW __asm__ ("v27") =                 \

  778.             (vector signed short) vec_mergel((vector signed char) vzero,    \

  779.                                              (vector signed char) dstO);    \

  780.                                                                             \

  781.         /* subtractions inside the first butterfly */                       \

  782.         register vector signed short but0  __asm__ ("v28") =                \

  783.             vec_sub(srcV, dstV);                                            \

  784.         register vector signed short but0S __asm__ ("v29") =                \

  785.             vec_sub(srcW, dstW);                                            \

  786.         register vector signed short op1   __asm__ ("v30") =                \

  787.             vec_perm(but0, but0, perm1);                                    \

  788.         register vector signed short but1  __asm__ ("v22") =                \

  789.             vec_mladd(but0, vprod1, op1);                                   \

  790.         register vector signed short op1S  __asm__ ("v23") =                \

  791.             vec_perm(but0S, but0S, perm1);                                  \

  792.         register vector signed short but1S __asm__ ("v24") =                \

  793.             vec_mladd(but0S, vprod1, op1S);                                 \

  794.         register vector signed short op2   __asm__ ("v25") =                \

  795.             vec_perm(but1, but1, perm2);                                    \

  796.         register vector signed short but2  __asm__ ("v26") =                \

  797.             vec_mladd(but1, vprod2, op2);                                   \

  798.         register vector signed short op2S  __asm__ ("v27") =                \

  799.             vec_perm(but1S, but1S, perm2);                                  \

  800.         register vector signed short but2S __asm__ ("v28") =                \

  801.             vec_mladd(but1S, vprod2, op2S);                                 \

  802.         register vector signed short op3   __asm__ ("v29") =                \

  803.             vec_perm(but2, but2, perm3);                                    \

  804.         register vector signed short op3S  __asm__ ("v30") =                \

  805.             vec_perm(but2S, but2S, perm3);                                  \

  806.         res1 = vec_mladd(but2, vprod3, op3);                                \

  807.         res2 = vec_mladd(but2S, vprod3, op3S);                              \

  808.     }

  809.         ONEITERBUTTERFLY(0, temp0, temp0S);

  810.         ONEITERBUTTERFLY(1, temp1, temp1S);

  811.         ONEITERBUTTERFLY(2, temp2, temp2S);

  812.         ONEITERBUTTERFLY(3, temp3, temp3S);

  813.         ONEITERBUTTERFLY(4, temp4, temp4S);

  814.         ONEITERBUTTERFLY(5, temp5, temp5S);

  815.         ONEITERBUTTERFLY(6, temp6, temp6S);

  816.         ONEITERBUTTERFLY(7, temp7, temp7S);

  817.     }

  818. #undef ONEITERBUTTERFLY

  819.     {

  820.         register vector signed int vsum;

  821. 

  822.         register vector signed short line0  = vec_add(temp0, temp1);

  823.         register vector signed short line1  = vec_sub(temp0, temp1);

  824.         register vector signed short line2  = vec_add(temp2, temp3);

  825.         register vector signed short line3  = vec_sub(temp2, temp3);

  826.         register vector signed short line4  = vec_add(temp4, temp5);

  827.         register vector signed short line5  = vec_sub(temp4, temp5);

  828.         register vector signed short line6  = vec_add(temp6, temp7);

  829.         register vector signed short line7  = vec_sub(temp6, temp7);

  830. 

  831.         register vector signed short line0B = vec_add(line0, line2);

  832.         register vector signed short line2B = vec_sub(line0, line2);

  833.         register vector signed short line1B = vec_add(line1, line3);

  834.         register vector signed short line3B = vec_sub(line1, line3);

  835.         register vector signed short line4B = vec_add(line4, line6);

  836.         register vector signed short line6B = vec_sub(line4, line6);

  837.         register vector signed short line5B = vec_add(line5, line7);

  838.         register vector signed short line7B = vec_sub(line5, line7);

  839. 

  840.         register vector signed short line0C = vec_add(line0B, line4B);

  841.         register vector signed short line4C = vec_sub(line0B, line4B);

  842.         register vector signed short line1C = vec_add(line1B, line5B);

  843.         register vector signed short line5C = vec_sub(line1B, line5B);

  844.         register vector signed short line2C = vec_add(line2B, line6B);

  845.         register vector signed short line6C = vec_sub(line2B, line6B);

  846.         register vector signed short line3C = vec_add(line3B, line7B);

  847.         register vector signed short line7C = vec_sub(line3B, line7B);

  848. 

  849.         register vector signed short line0S = vec_add(temp0S, temp1S);

  850.         register vector signed short line1S = vec_sub(temp0S, temp1S);

  851.         register vector signed short line2S = vec_add(temp2S, temp3S);

  852.         register vector signed short line3S = vec_sub(temp2S, temp3S);

  853.         register vector signed short line4S = vec_add(temp4S, temp5S);

  854.         register vector signed short line5S = vec_sub(temp4S, temp5S);

  855.         register vector signed short line6S = vec_add(temp6S, temp7S);

  856.         register vector signed short line7S = vec_sub(temp6S, temp7S);

  857. 

  858.         register vector signed short line0BS = vec_add(line0S, line2S);

  859.         register vector signed short line2BS = vec_sub(line0S, line2S);

  860.         register vector signed short line1BS = vec_add(line1S, line3S);

  861.         register vector signed short line3BS = vec_sub(line1S, line3S);

  862.         register vector signed short line4BS = vec_add(line4S, line6S);

  863.         register vector signed short line6BS = vec_sub(line4S, line6S);

  864.         register vector signed short line5BS = vec_add(line5S, line7S);

  865.         register vector signed short line7BS = vec_sub(line5S, line7S);

  866. 

  867.         register vector signed short line0CS = vec_add(line0BS, line4BS);

  868.         register vector signed short line4CS = vec_sub(line0BS, line4BS);

  869.         register vector signed short line1CS = vec_add(line1BS, line5BS);

  870.         register vector signed short line5CS = vec_sub(line1BS, line5BS);

  871.         register vector signed short line2CS = vec_add(line2BS, line6BS);

  872.         register vector signed short line6CS = vec_sub(line2BS, line6BS);

  873.         register vector signed short line3CS = vec_add(line3BS, line7BS);

  874.         register vector signed short line7CS = vec_sub(line3BS, line7BS);

  875. 

  876.         vsum = vec_sum4s(vec_abs(line0C), vec_splat_s32(0));

  877.         vsum = vec_sum4s(vec_abs(line1C), vsum);

  878.         vsum = vec_sum4s(vec_abs(line2C), vsum);

  879.         vsum = vec_sum4s(vec_abs(line3C), vsum);

  880.         vsum = vec_sum4s(vec_abs(line4C), vsum);

  881.         vsum = vec_sum4s(vec_abs(line5C), vsum);

  882.         vsum = vec_sum4s(vec_abs(line6C), vsum);

  883.         vsum = vec_sum4s(vec_abs(line7C), vsum);

  884. 

  885.         vsum = vec_sum4s(vec_abs(line0CS), vsum);

  886.         vsum = vec_sum4s(vec_abs(line1CS), vsum);

  887.         vsum = vec_sum4s(vec_abs(line2CS), vsum);

  888.         vsum = vec_sum4s(vec_abs(line3CS), vsum);

  889.         vsum = vec_sum4s(vec_abs(line4CS), vsum);

  890.         vsum = vec_sum4s(vec_abs(line5CS), vsum);

  891.         vsum = vec_sum4s(vec_abs(line6CS), vsum);

  892.         vsum = vec_sum4s(vec_abs(line7CS), vsum);

  893.         vsum = vec_sums(vsum, (vector signed int) vzero);

  894.         vsum = vec_splat(vsum, 3);

  895.         vec_ste(vsum, 0, &sum);

  896.     }

  897.     return sum;

  898. }

  899. 

  900. static int hadamard8_diff16_altivec(MpegEncContext *s, uint8_t *dst,

  901.                                     uint8_t *src, int stride, int h)

  902. {

  903.     int score = hadamard8_diff16x8_altivec(s, dst, src, stride, 8);

  904. 

  905.     if (h == 16) {

  906.         dst   += 8 * stride;

  907.         src   += 8 * stride;

  908.         score += hadamard8_diff16x8_altivec(s, dst, src, stride, 8);

  909.     }

  910.     return score;

  911. }

  912. 

  913. av_cold void ff_dsputil_init_altivec(DSPContext *c, AVCodecContext *avctx,

  914.                                      unsigned high_bit_depth)

  915. {

  916.     c->pix_abs[0][1] = sad16_x2_altivec;

  917.     c->pix_abs[0][2] = sad16_y2_altivec;

  918.     c->pix_abs[0][3] = sad16_xy2_altivec;

  919.     c->pix_abs[0][0] = sad16_altivec;

  920.     c->pix_abs[1][0] = sad8_altivec;

  921. 

  922.     c->sad[0] = sad16_altivec;

  923.     c->sad[1] = sad8_altivec;

  924.     c->sse[0] = sse16_altivec;

  925.     c->sse[1] = sse8_altivec;

  926. 

  927.     c->pix_norm1 = pix_norm1_altivec;

  928.     c->pix_sum   = pix_sum_altivec;

  929. 

  930.     c->diff_pixels = diff_pixels_altivec;

  931. 

  932.     if (!high_bit_depth) {

  933.         c->get_pixels = get_pixels_altivec;

  934.         c->clear_block = clear_block_altivec;

  935.     }

  936. 

  937.     c->hadamard8_diff[0] = hadamard8_diff16_altivec;

  938.     c->hadamard8_diff[1] = hadamard8_diff8x8_altivec;

  939. }