Paul Davis
449aab3c46
git-svn-id: svn://localhost/ardour2/branches/3.0@3435 d708f5d6-7413-0410-9779-e7cbd77b26cf
141 lines
4.9 KiB
C++
141 lines
4.9 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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///
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/// gcc version of the x86 CPU detect routine.
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///
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/// This file is to be compiled on any platform with the GNU C compiler.
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/// Compiler. Please see 'cpu_detect_x86_win.cpp' for the x86 Windows version
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/// of this file.
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///
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/// Author : Copyright (c) Olli Parviainen
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/// Author e-mail : oparviai @ iki.fi
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/// SoundTouch WWW: http://www.iki.fi/oparviai/soundtouch
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///
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////////////////////////////////////////////////////////////////////////////////
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//
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// Last changed : $Date$
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// File revision : $Revision$
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//
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// $Id$
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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// License :
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//
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// SoundTouch audio processing library
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// Copyright (c) Olli Parviainen
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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////////////////////////////////////////////////////////////////////////////////
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#include <stdexcept>
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#include <string>
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#include "cpu_detect.h"
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#ifndef __GNUC__
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#error wrong platform - this source code file is for the GNU C compiler.
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#endif
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using namespace std;
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#include <stdio.h>
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//////////////////////////////////////////////////////////////////////////////
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//
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// processor instructions extension detection routines
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//
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//////////////////////////////////////////////////////////////////////////////
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// Flag variable indicating whick ISA extensions are disabled (for debugging)
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static uint _dwDisabledISA = 0x00; // 0xffffffff; //<- use this to disable all extensions
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// Disables given set of instruction extensions. See SUPPORT_... defines.
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void disableExtensions(uint dwDisableMask)
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{
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_dwDisabledISA = dwDisableMask;
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}
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/// Checks which instruction set extensions are supported by the CPU.
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uint detectCPUextensions(void)
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{
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#ifndef __i386__
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return 0; // always disable extensions on non-x86 platforms.
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#else
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uint res = 0;
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if (_dwDisabledISA == 0xffffffff) return 0;
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asm volatile(
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"\n\tpushl %%ebx" // store ebx
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"\n\txor %%esi, %%esi" // clear %%esi = result register
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// check if 'cpuid' instructions is available by toggling eflags bit 21
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"\n\tpushf" // save eflags to stack
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"\n\tpop %%eax" // load eax from stack (with eflags)
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"\n\tmovl %%eax, %%ecx" // save the original eflags values to ecx
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"\n\txor $0x00200000, %%eax" // toggle bit 21
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"\n\tpush %%eax" // store toggled eflags to stack
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"\n\tpopf" // load eflags from stack
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"\n\tpushf" // save updated eflags to stack
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"\n\tpop %%eax" // load from stack
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"\n\txor %%edx, %%edx" // clear edx for defaulting no mmx
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"\n\tcmp %%ecx, %%eax" // compare to original eflags values
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"\n\tjz end" // jumps to 'end' if cpuid not present
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// cpuid instruction available, test for presence of mmx instructions
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"\n\tmovl $1, %%eax"
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"\n\tcpuid"
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// movl $0x00800000, %edx // force enable MMX
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"\n\ttest $0x00800000, %%edx"
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"\n\tjz end" // branch if MMX not available
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"\n\tor $0x01, %%esi" // otherwise add MMX support bit
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"\n\ttest $0x02000000, %%edx"
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"\n\tjz test3DNow" // branch if SSE not available
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"\n\tor $0x08, %%esi" // otherwise add SSE support bit
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"\n\ttest3DNow:"
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// test for precense of AMD extensions
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"\n\tmov $0x80000000, %%eax"
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"\n\tcpuid"
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"\n\tcmp $0x80000000, %%eax"
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"\n\tjbe end" // branch if no AMD extensions detected
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// test for precense of 3DNow! extension
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"\n\tmov $0x80000001, %%eax"
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"\n\tcpuid"
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"\n\ttest $0x80000000, %%edx"
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"\n\tjz end" // branch if 3DNow! not detected
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"\n\tor $0x02, %%esi" // otherwise add 3DNow support bit
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"\n\tend:"
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"\n\tmov %%esi, %0"
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"\n\tpopl %%ebx"
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: "=r" (res)
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: /* no inputs */
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: "%edx", "%eax", "%ecx", "%esi" );
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return res & ~_dwDisabledISA;
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#endif
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}
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