1/*
2 * Copyright (c) 2017 Kaustubh Raste (kaustubh.raste@imgtec.com)
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 "libavutil/mips/cpu.h"
22#include "config.h"
23#include "libavutil/attributes.h"
24#include "libavutil/mips/asmdefs.h"
25#include "libavcodec/videodsp.h"
26
27static void prefetch_mips(uint8_t *mem, ptrdiff_t stride, int h)
28{
29    register const uint8_t *p = mem;
30
31    __asm__ volatile (
32        "1:                                     \n\t"
33        "pref          4,  0(%[p])              \n\t"
34        "pref          4,  32(%[p])             \n\t"
35        PTR_ADDIU"  %[h],  %[h],     -1         \n\t"
36        PTR_ADDU "  %[p],  %[p],     %[stride]  \n\t"
37
38        "bnez       %[h],  1b                   \n\t"
39
40        : [p] "+r" (p), [h] "+r" (h)
41        : [stride] "r" (stride)
42    );
43}
44
45av_cold void ff_videodsp_init_mips(VideoDSPContext *ctx, int bpc)
46{
47    int cpu_flags = av_get_cpu_flags();
48
49    if (have_msa(cpu_flags))
50        ctx->prefetch = prefetch_mips;
51}
52