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/*****************************************************************************
*
* gcc version of the MMX optimized routines. All MMX optimized functions
* have been gathered into this single source code file, regardless to their
* class or original source code file, in order to ease porting the library
* to other compiler and processor platforms.
*
* This file is to be compiled on any platform with the GNU C compiler.
* Compiler. Please see 'mmx_win.cpp' for the x86 Windows version of this
* file.
*
* Author : Copyright (c) Olli Parviainen
* Author e-mail : oparviai @ iki.fi
* File created : 13-Jan-2002
*
* Last changed : $Date: 2004/11/05 03:28:10 $
* File revision : $Revision: 1.1.1.1.2.1 $
*
* $Id: cpu_detect_x86_gcc.cpp,v 1.1.1.1.2.1 2004/11/05 03:28:10 mbrubeck Exp $
*
* Acknowledgements:
* Adopted for gcc : Stuart Lamble <sjl @ debian.lib.monash.edu.au>
* Adopted for gcc3: Shachar Raindel <shacharr @ users.sourceforge.net>
*
* License :
*
* SoundTouch sound processing library
* Copyright (c) Olli Parviainen
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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 <stdexcept>
#include <string>
#include "cpu_detect.h"
#ifndef __GNUC__
#error wrong platform - this source code file is for the GNU C compiler.
#endif
using namespace std;
#include <stdio.h>
//////////////////////////////////////////////////////////////////////////////
//
// processor instructions extension detection routines
//
//////////////////////////////////////////////////////////////////////////////
// Flag variable indicating whick ISA extensions are disabled (for debugging)
static uint _dwDisabledISA = 0x00; // 0xffffffff; //<- use this to disable all extensions
// Disables given set of instruction extensions. See SUPPORT_... defines.
void disableExtensions(uint dwDisableMask)
{
_dwDisabledISA = dwDisableMask;
}
/// Checks which instruction set extensions are supported by the CPU.
uint detectCPUextensions(void)
{
#ifndef __i386__
return 0; // always disable extensions on non-x86 platforms.
#else
uint res = 0;
if (_dwDisabledISA == 0xffffffff) return 0;
asm volatile(
"\n\txor %%esi, %%esi" // clear %%esi = result register
// check if 'cpuid' instructions is available by toggling eflags bit 21
"\n\tpushf" // save eflags to stack
"\n\tpop %%eax" // load eax from stack (with eflags)
"\n\tmovl %%eax, %%ecx" // save the original eflags values to ecx
"\n\txor $0x00200000, %%eax" // toggle bit 21
"\n\tpush %%eax" // store toggled eflags to stack
"\n\tpopf" // load eflags from stack
"\n\tpushf" // save updated eflags to stack
"\n\tpop %%eax" // load from stack
"\n\txor %%edx, %%edx" // clear edx for defaulting no mmx
"\n\tcmp %%eax, %%ecx" // compare to original eflags values
"\n\tjz end" // jumps to 'end' if cpuid not present
// cpuid instruction available, test for presence of mmx instructions
"\n\tmovl $1, %%eax"
"\n\tcpuid"
// movl $0x00800000, %edx // force enable MMX
"\n\ttest $0x00800000, %%edx"
"\n\tjz end" // branch if MMX not available
"\n\tor $0x01, %%esi" // otherwise add MMX support bit
"\n\ttest $0x02000000, %%edx"
"\n\tjz test3DNow" // branch if SSE not available
"\n\tor $0x08, %%esi" // otherwise add SSE support bit
"\n\ttest3DNow:"
// test for precense of AMD extensions
"\n\tmov $0x80000000, %%eax"
"\n\tcpuid"
"\n\tcmp $0x80000000, %%eax"
"\n\tjbe end" // branch if no AMD extensions detected
// test for precense of 3DNow! extension
"\n\tmov $0x80000001, %%eax"
"\n\tcpuid"
"\n\ttest $0x80000000, %%edx"
"\n\tjz end" // branch if 3DNow! not detected
"\n\tor $0x02, %%esi" // otherwise add 3DNow support bit
"\n\tend:"
"\n\tmov %%esi, %0"
: "=rm" (res)
: /* no inputs */
: "%edx", "%eax", "%ecx", "%ebx", "%esi" );
return res & ~_dwDisabledISA;
#endif
}
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