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 
25 #define LOONGARCH_CFG2 0x2
26 #define LOONGARCH_CFG2_LSX (1 << 6)
27 #define LOONGARCH_CFG2_LASX (1 << 7)
28 
29 static int cpu_flags_cpucfg(void)
30 {
31  int flags = 0;
32  uint32_t cfg2 = 0;
33 
34  __asm__ volatile(
35  "cpucfg %0, %1 \n\t"
36  : "+&r"(cfg2)
37  : "r"(LOONGARCH_CFG2)
38  );
39 
40  if (cfg2 & LOONGARCH_CFG2_LSX)
42 
43  if (cfg2 & LOONGARCH_CFG2_LASX)
45 
46  return flags;
47 }
48 
50 {
51 #if defined __linux__
52  return cpu_flags_cpucfg();
53 #else
54  /* Assume no SIMD ASE supported */
55  return 0;
56 #endif
57 }
58 
60 {
61  int flags = av_get_cpu_flags();
62 
63  if (flags & AV_CPU_FLAG_LASX)
64  return 32;
65  if (flags & AV_CPU_FLAG_LSX)
66  return 16;
67 
68  return 8;
69 }
AV_CPU_FLAG_LSX
#define AV_CPU_FLAG_LSX
Definition: cpu.h:78
ff_get_cpu_max_align_loongarch
size_t ff_get_cpu_max_align_loongarch(void)
Definition: cpu.c:59
ff_get_cpu_flags_loongarch
int ff_get_cpu_flags_loongarch(void)
Definition: cpu.c:49
av_get_cpu_flags
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:100
cpu_flags_cpucfg
static int cpu_flags_cpucfg(void)
Definition: cpu.c:29
LOONGARCH_CFG2_LSX
#define LOONGARCH_CFG2_LSX
Definition: cpu.c:26
AV_CPU_FLAG_LASX
#define AV_CPU_FLAG_LASX
Definition: cpu.h:79
LOONGARCH_CFG2_LASX
#define LOONGARCH_CFG2_LASX
Definition: cpu.c:27
LOONGARCH_CFG2
#define LOONGARCH_CFG2
Definition: cpu.c:25
__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")
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
cpu.h