libavcodec/ppc/int_altivec.c

   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 /**
  22  ** @file int_altivec.c
  23  ** integer misc ops.
  24  **/
  25
  26 #include "../dsputil.h"
  27
  28 #include "gcc_fixes.h"
  29
  30 #include "dsputil_altivec.h"
  31
  32 static int ssd_int8_vs_int16_altivec(int8_t *pix1, int16_t *pix2, int size) {
  33     int i, size16;
  34     vector signed char vpix1;
  35     vector signed short vpix2, vdiff, vpix1l,vpix1h;
  36     union { vector signed int vscore;
  37             int32_t score[4];
  38            } u;
  39     u.vscore = vec_splat_s32(0);
  40 //
  41 //XXX lazy way, fix it later
  42
  43 #define vec_unaligned_load(b) \
  44     vec_perm(vec_ld(0,b),vec_ld(15,b),vec_lvsl(0, b));
  45
  46     size16 = size >> 4;
  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
  76 void int_init_altivec(DSPContext* c, AVCodecContext *avctx)
  77 {
  78     c->ssd_int8_vs_int16 = ssd_int8_vs_int16_altivec;
  79 }