1/*
2 * Copyright (c) 2021 Loongson Technology Corporation Limited
3 * Contributed by Xiwei Gu <guxiwei-hf@loongson.cn>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "libavcodec/videodsp.h"
23#include "libavutil/attributes.h"
24
25static void prefetch_loongarch(uint8_t *mem, ptrdiff_t stride, int h)
26{
27    register const uint8_t *p = mem;
28
29    __asm__ volatile (
30        "1:                                     \n\t"
31        "preld      0,     %[p],     0          \n\t"
32        "preld      0,     %[p],     32         \n\t"
33        "addi.d     %[h],  %[h],     -1         \n\t"
34        "add.d      %[p],  %[p],     %[stride]  \n\t"
35
36        "blt        $r0,   %[h],     1b         \n\t"
37        : [p] "+r" (p), [h] "+r" (h)
38        : [stride] "r" (stride)
39    );
40}
41
42av_cold void ff_videodsp_init_loongarch(VideoDSPContext *ctx, int bpc)
43{
44    ctx->prefetch = prefetch_loongarch;
45}
46