src/libFLAC/cpu.c

/* libFLAC - Free Lossless Audio Codec library
 * Copyright (C) 2001  Josh Coalson
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA  02111-1307, USA.
 */

#include "private/cpu.h"
#include<stdlib.h>
#include<stdio.h>

#if !defined(FLAC__NO_ASM) && defined(FLAC__CPU_IA32) && defined(FLAC__HAS_NASM) && !defined(FLAC__SSE_OS) && !defined(NO_VFORK)
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#endif

const unsigned FLAC__CPUINFO_IA32_CPUID_CMOV = 0x00008000;
const unsigned FLAC__CPUINFO_IA32_CPUID_MMX = 0x00800000;
const unsigned FLAC__CPUINFO_IA32_CPUID_FXSR = 0x01000000;
const unsigned FLAC__CPUINFO_IA32_CPUID_SSE = 0x02000000;
const unsigned FLAC__CPUINFO_IA32_CPUID_SSE2 = 0x04000000;

const unsigned FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_3DNOW = 0x80000000;
const unsigned FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_EXT3DNOW = 0x40000000;
const unsigned FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_EXTMMX = 0x00400000;


void FLAC__cpu_info(FLAC__CPUInfo *info)
{
#ifdef FLAC__CPU_IA32
	info->type = FLAC__CPUINFO_TYPE_IA32;
#if !defined FLAC__NO_ASM && defined FLAC__HAS_NASM
	info->use_asm = true;
	{
		unsigned cpuid = FLAC__cpu_info_asm_ia32();
		info->data.ia32.cmov = (cpuid & FLAC__CPUINFO_IA32_CPUID_CMOV)? true : false;
		info->data.ia32.mmx = (cpuid & FLAC__CPUINFO_IA32_CPUID_MMX)? true : false;
		info->data.ia32.fxsr = (cpuid & FLAC__CPUINFO_IA32_CPUID_FXSR)? true : false;
		info->data.ia32.sse = (cpuid & FLAC__CPUINFO_IA32_CPUID_SSE)? true : false;
		info->data.ia32.sse2 = (cpuid & FLAC__CPUINFO_IA32_CPUID_SSE2)? true : false;

#ifndef FLAC__SSE_OS
#ifndef NO_VFORK
		if(info->data.ia32.sse == true || info->data.ia32.sse2 == true) {
			int pid, status, sse;
			pid = vfork();
			if(!pid) {
				FLAC__cpu_info_sse_test_asm_ia32();
				exit(0);
			}
			sse = 0;
			if(pid > 0) {
				waitpid(pid, &status, 0);
				if(WIFEXITED(status) && WEXITSTATUS(status) == 0)
					sse = 1;        /* there was normal exit, no SIGILL */
			}
			if(!sse)
				info->data.ia32.sse = info->data.ia32.sse2 = false;
		}
#else
		/* we are assuming OS isn't supporting SSE */
		info->data.ia32.sse = info->data.ia32.sse2 = false;
#endif
#endif

		cpuid = FLAC__cpu_info_extended_amd_asm_ia32();
		info->data.ia32._3dnow = (cpuid & FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_3DNOW)? true : false;
		info->data.ia32.ext3dnow = (cpuid & FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_EXT3DNOW)? true : false;
		info->data.ia32.extmmx = (cpuid & FLAC__CPUINFO_IA32_CPUID_EXTENDED_AMD_EXTMMX)? true : false;
	}
#else
	info->use_asm = false;
#endif
#else
	info->type = FLAC__CPUINFO_TYPE_UNKNOWN;
	info->use_asm = false;
#endif
}