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
prefetch_loongarch(uint8_t * mem,ptrdiff_t stride,int h)25 static 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
ff_videodsp_init_loongarch(VideoDSPContext * ctx,int bpc)42 av_cold void ff_videodsp_init_loongarch(VideoDSPContext *ctx, int bpc)
43 {
44 ctx->prefetch = prefetch_loongarch;
45 }
46