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  1. /*
  2.  * Copyright (c) 2007 Luca Barbato <lu_zero@gentoo.org>
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include <stdint.h>
  22.  
  23. #include "config.h"
  24. #if HAVE_ALTIVEC_H
  25. #include <altivec.h>
  26. #endif
  27.  
  28. #include "libavutil/attributes.h"
  29. #include "libavutil/cpu.h"
  30. #include "libavutil/ppc/cpu.h"
  31. #include "libavutil/ppc/types_altivec.h"
  32. #include "libavutil/ppc/util_altivec.h"
  33. #include "libavcodec/svq1enc.h"
  34.  
  35. #if HAVE_ALTIVEC
  36. static int ssd_int8_vs_int16_altivec(const int8_t *pix1, const int16_t *pix2,
  37.                                      int size)
  38. {
  39.     int i, size16 = size >> 4;
  40.     vector signed char vpix1;
  41.     vector signed short vpix2, vdiff, vpix1l, vpix1h;
  42.     union {
  43.         vector signed int vscore;
  44.         int32_t score[4];
  45.     } u = { .vscore = vec_splat_s32(0) };
  46.  
  47.     while (size16) {
  48.         // score += (pix1[i] - pix2[i]) * (pix1[i] - pix2[i]);
  49.         // load pix1 and the first batch of pix2
  50.  
  51.         vpix1 = vec_unaligned_load(pix1);
  52.         vpix2 = vec_unaligned_load(pix2);
  53.         pix2 += 8;
  54.         // unpack
  55.         vpix1h = vec_unpackh(vpix1);
  56.         vdiff  = vec_sub(vpix1h, vpix2);
  57.         vpix1l = vec_unpackl(vpix1);
  58.         // load another batch from pix2
  59.         vpix2    = vec_unaligned_load(pix2);
  60.         u.vscore = vec_msum(vdiff, vdiff, u.vscore);
  61.         vdiff    = vec_sub(vpix1l, vpix2);
  62.         u.vscore = vec_msum(vdiff, vdiff, u.vscore);
  63.         pix1    += 16;
  64.         pix2    += 8;
  65.         size16--;
  66.     }
  67.     u.vscore = vec_sums(u.vscore, vec_splat_s32(0));
  68.  
  69.     size %= 16;
  70.     for (i = 0; i < size; i++)
  71.         u.score[3] += (pix1[i] - pix2[i]) * (pix1[i] - pix2[i]);
  72.  
  73.     return u.score[3];
  74. }
  75. #endif /* HAVE_ALTIVEC */
  76.  
  77. av_cold void ff_svq1enc_init_ppc(SVQ1EncContext *c)
  78. {
  79. #if HAVE_ALTIVEC
  80.     if (!PPC_ALTIVEC(av_get_cpu_flags()))
  81.         return;
  82.  
  83.     c->ssd_int8_vs_int16 = ssd_int8_vs_int16_altivec;
  84. #endif /* HAVE_ALTIVEC */
  85. }
  86.