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
25#include "libavutil/attributes.h"
26#include "libavutil/cpu.h"
27#include "libavutil/ppc/cpu.h"
28#include "libavutil/ppc/util_altivec.h"
29
30#include "libavcodec/lossless_videodsp.h"
31
32#if HAVE_ALTIVEC
33static void add_bytes_altivec(uint8_t *dst, uint8_t *src, ptrdiff_t w)
34{
35    register int i;
36    register vector unsigned char vdst, vsrc;
37
38    /* dst and src are 16 bytes-aligned (guaranteed). */
39    for (i = 0; i + 15 < w; i += 16) {
40        vdst = vec_ld(i, (unsigned char *) dst);
41        vsrc = vec_ld(i, (unsigned char *) src);
42        vdst = vec_add(vsrc, vdst);
43        vec_st(vdst, i, (unsigned char *) dst);
44    }
45    /* If w is not a multiple of 16. */
46    for (; i < w; i++)
47        dst[i] = src[i];
48}
49#endif /* HAVE_ALTIVEC */
50
51av_cold void ff_llviddsp_init_ppc(LLVidDSPContext *c)
52{
53#if HAVE_ALTIVEC
54    if (!PPC_ALTIVEC(av_get_cpu_flags()))
55        return;
56
57    c->add_bytes = add_bytes_altivec;
58#endif /* HAVE_ALTIVEC */
59}
60