FFmpeg
videodsp_init.c
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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 
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 
43 {
44  ctx->prefetch = prefetch_loongarch;
45 }
prefetch_loongarch
static void prefetch_loongarch(uint8_t *mem, ptrdiff_t stride, int h)
Definition: videodsp_init.c:25
av_cold
#define av_cold
Definition: attributes.h:90
ctx
AVFormatContext * ctx
Definition: movenc.c:48
attributes.h
ff_videodsp_init_loongarch
av_cold void ff_videodsp_init_loongarch(VideoDSPContext *ctx, int bpc)
Definition: videodsp_init.c:42
stride
#define stride
Definition: h264pred_template.c:537
__asm__
__asm__(".macro parse_r var r\n\t" "\\var = -1\n\t" _IFC_REG(0) _IFC_REG(1) _IFC_REG(2) _IFC_REG(3) _IFC_REG(4) _IFC_REG(5) _IFC_REG(6) _IFC_REG(7) _IFC_REG(8) _IFC_REG(9) _IFC_REG(10) _IFC_REG(11) _IFC_REG(12) _IFC_REG(13) _IFC_REG(14) _IFC_REG(15) _IFC_REG(16) _IFC_REG(17) _IFC_REG(18) _IFC_REG(19) _IFC_REG(20) _IFC_REG(21) _IFC_REG(22) _IFC_REG(23) _IFC_REG(24) _IFC_REG(25) _IFC_REG(26) _IFC_REG(27) _IFC_REG(28) _IFC_REG(29) _IFC_REG(30) _IFC_REG(31) ".iflt \\var\n\t" ".error \"Unable to parse register name \\r\"\n\t" ".endif\n\t" ".endm")
VideoDSPContext
Definition: videodsp.h:41
videodsp.h
h
h
Definition: vp9dsp_template.c:2038