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 }