FFmpeg
cpu.c
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1 /*
2  * Copyright (c) 2020 Loongson Technology Corporation Limited
3  * Contributed by Shiyou Yin <yinshiyou-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 <stdint.h>
23 #include "cpu.h"
24 #include <sys/auxv.h>
25 
26 #define LA_HWCAP_LSX (1<<4)
27 #define LA_HWCAP_LASX (1<<5)
28 static int cpu_flags_getauxval(void)
29 {
30  int flags = 0;
31  int flag = (int)getauxval(AT_HWCAP);
32 
33  if (flag & LA_HWCAP_LSX)
35  if (flag & LA_HWCAP_LASX)
37 
38  return flags;
39 }
40 
42 {
43 #if defined __linux__
44  return cpu_flags_getauxval();
45 #else
46  /* Assume no SIMD ASE supported */
47  return 0;
48 #endif
49 }
50 
52 {
53  int flags = av_get_cpu_flags();
54 
55  if (flags & AV_CPU_FLAG_LASX)
56  return 32;
57  if (flags & AV_CPU_FLAG_LSX)
58  return 16;
59 
60  return 8;
61 }
AV_CPU_FLAG_LSX
#define AV_CPU_FLAG_LSX
Definition: cpu.h:80
ff_get_cpu_max_align_loongarch
size_t ff_get_cpu_max_align_loongarch(void)
Definition: cpu.c:51
ff_get_cpu_flags_loongarch
int ff_get_cpu_flags_loongarch(void)
Definition: cpu.c:41
av_get_cpu_flags
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:103
LA_HWCAP_LASX
#define LA_HWCAP_LASX
Definition: cpu.c:27
cpu_flags_getauxval
static int cpu_flags_getauxval(void)
Definition: cpu.c:28
flag
int flag
Definition: cpu.c:34
AV_CPU_FLAG_LASX
#define AV_CPU_FLAG_LASX
Definition: cpu.h:81
LA_HWCAP_LSX
#define LA_HWCAP_LSX
Definition: cpu.c:26
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
int
int
Definition: ffmpeg_filter.c:410
cpu.h