huffyuvdsp_altivec.c

   1 /*
   2  * Copyright (c) 2002 Brian Foley
   3  * Copyright (c) 2002 Dieter Shirley
   4  * Copyright (c) 2003-2004 Romain Dolbeau <romain@dolbeau.org>
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "config.h"
  24 #if HAVE_ALTIVEC_H
  25 #include <altivec.h>
  26 #endif
  27
  28 #include "libavutil/attributes.h"
  29 #include "libavutil/cpu.h"
  30 #include "libavutil/ppc/cpu.h"
  31 #include "libavutil/ppc/types_altivec.h"
  32 #include "libavutil/ppc/util_altivec.h"
  33 #include "libavcodec/huffyuvdsp.h"
  34
  35 #if HAVE_ALTIVEC
  36 static void add_bytes_altivec(uint8_t *dst, uint8_t *src, intptr_t w)
  37 {
  38     register int i;
  39     register vector unsigned char vdst, vsrc;
  40
  41     /* dst and src are 16 bytes-aligned (guaranteed). */
  42     for (i = 0; i + 15 < w; i += 16) {
  43         vdst = vec_ld(i, (unsigned char *) dst);
  44         vsrc = vec_ld(i, (unsigned char *) src);
  45         vdst = vec_add(vsrc, vdst);
  46         vec_st(vdst, i, (unsigned char *) dst);
  47     }
  48     /* If w is not a multiple of 16. */
  49     for (; i < w; i++)
  50         dst[i] = src[i];
  51 }
  52 #endif /* HAVE_ALTIVEC */
  53
  54 av_cold void ff_huffyuvdsp_init_ppc(HuffYUVDSPContext *c)
  55 {
  56 #if HAVE_ALTIVEC
  57     if (!PPC_ALTIVEC(av_get_cpu_flags()))
  58         return;
  59
  60     c->add_bytes = add_bytes_altivec;
  61 #endif /* HAVE_ALTIVEC */
  62 }