update library version
[flac.git] / src / libFLAC / cpu.c
1 /* libFLAC - Free Lossless Audio Codec library
2  * Copyright (C) 2001  Josh Coalson
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Library General Public
6  * License as published by the Free Software Foundation; either
7  * version 2 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  * Library General Public License for more details.
13  *
14  * You should have received a copy of the GNU Library General Public
15  * License along with this library; if not, write to the
16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17  * Boston, MA  02111-1307, USA.
18  */
19
20 #include "private/cpu.h"
21 #include<stdlib.h>
22 #include<stdio.h>
23
24 #if !defined(FLAC__NO_ASM) && defined(FLAC__CPU_IA32) && defined(FLAC__HAS_NASM) && !defined(FLAC__SSE_OS) && !defined(NO_VFORK)
25 #include <unistd.h>
26 #include <sys/types.h>
27 #include <sys/wait.h>
28 #endif
29
30 const unsigned FLAC__CPUINFO_IA32_CPUID_CMOV = 0x00008000;
31 const unsigned FLAC__CPUINFO_IA32_CPUID_MMX = 0x00800000;
32 const unsigned FLAC__CPUINFO_IA32_CPUID_FXSR = 0x01000000;
33 const unsigned FLAC__CPUINFO_IA32_CPUID_SSE = 0x02000000;
34 const unsigned FLAC__CPUINFO_IA32_CPUID_SSE2 = 0x04000000;
35
36 const unsigned FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_3DNOW = 0x80000000;
37 const unsigned FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_EXT3DNOW = 0x40000000;
38 const unsigned FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_EXTMMX = 0x00400000;
39
40
41 void FLAC__cpu_info(FLAC__CPUInfo *info)
42 {
43 #ifdef FLAC__CPU_IA32
44         info->type = FLAC__CPUINFO_TYPE_IA32;
45 #if !defined FLAC__NO_ASM && defined FLAC__HAS_NASM
46         info->use_asm = true;
47         {
48                 unsigned cpuid = FLAC__cpu_info_asm_ia32();
49                 info->data.ia32.cmov = (cpuid & FLAC__CPUINFO_IA32_CPUID_CMOV)? true : false;
50                 info->data.ia32.mmx = (cpuid & FLAC__CPUINFO_IA32_CPUID_MMX)? true : false;
51                 info->data.ia32.fxsr = (cpuid & FLAC__CPUINFO_IA32_CPUID_FXSR)? true : false;
52                 info->data.ia32.sse = (cpuid & FLAC__CPUINFO_IA32_CPUID_SSE)? true : false;
53                 info->data.ia32.sse2 = (cpuid & FLAC__CPUINFO_IA32_CPUID_SSE2)? true : false;
54
55 #ifndef FLAC__SSE_OS
56 #ifndef NO_VFORK
57                 if(info->data.ia32.sse == true || info->data.ia32.sse2 == true) {
58                         int pid, status, sse;
59                         pid = vfork();
60                         if(!pid) {
61                                 FLAC__cpu_info_sse_test_asm_ia32();
62                                 exit(0);
63                         }
64                         sse = 0;
65                         if(pid > 0) {
66                                 waitpid(pid, &status, 0);
67                                 if(WIFEXITED(status) && WEXITSTATUS(status) == 0)
68                                         sse = 1;        /* there was normal exit, no SIGILL */
69                         }
70                         if(!sse)
71                                 info->data.ia32.sse = info->data.ia32.sse2 = false;
72                 }
73 #else
74                 /* we are assuming OS isn't supporting SSE */
75                 info->data.ia32.sse = info->data.ia32.sse2 = false;
76 #endif
77 #endif
78
79                 cpuid = FLAC__cpu_info_extended_amd_asm_ia32();
80                 info->data.ia32._3dnow = (cpuid & FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_3DNOW)? true : false;
81                 info->data.ia32.ext3dnow = (cpuid & FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_EXT3DNOW)? true : false;
82                 info->data.ia32.extmmx = (cpuid & FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_EXTMMX)? true : false;
83         }
84 #else
85         info->use_asm = false;
86 #endif
87 #else
88         info->type = FLAC__CPUINFO_TYPE_UNKNOWN;
89         info->use_asm = false;
90 #endif
91 }