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//////////////////////////////////////////////////////////////////////////////// |
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/// |
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/// Generic version of the x86 CPU extension detection routine. |
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/// |
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/// This file is for GNU & other non-Windows compilers, see 'cpu_detect_x86_win.cpp' |
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/// for the Microsoft compiler version. |
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/// |
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/// Author : Copyright (c) Olli Parviainen |
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/// Author e-mail : oparviai 'at' iki.fi |
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/// SoundTouch WWW: http://www.surina.net/soundtouch |
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/// |
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//////////////////////////////////////////////////////////////////////////////// |
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// |
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// Last changed : $Date: 2009-02-25 19:13:51 +0200 (Wed, 25 Feb 2009) $ |
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// File revision : $Revision: 4 $ |
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// |
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// $Id: cpu_detect_x86_gcc.cpp 67 2009-02-25 17:13:51Z oparviai $ |
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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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|
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#include <stdexcept> |
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#include <string> |
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#include "cpu_detect.h" |
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#include "STTypes.h" |
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|
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using namespace std; |
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|
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#include <stdio.h> |
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|
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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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|
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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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|
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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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|
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|
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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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#if (!(ALLOW_X86_OPTIMIZATIONS) || !(__GNUC__)) |
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|
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return 0; // always disable extensions on non-x86 platforms. |
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|
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#else |
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uint res = 0; |
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|
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if (_dwDisabledISA == 0xffffffff) return 0; |
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|
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asm volatile( |
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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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|
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"\n\tpushf" // save eflags to stack |
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"\n\tmovl (%%esp), %%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\tmovl %%eax, (%%esp)" // 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\tmovl (%%esp), %%eax" // load eax from stack |
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"\n\tpopf" // pop stack to restore esp |
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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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|
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"\n\tmovl $1, %%eax" |
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"\n\tcpuid" |
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"\n\ttest $0x00800000, %%edx" |
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"\n\tjz end" // branch if MMX not available |
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|
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"\n\tor $0x01, %%esi" // otherwise add MMX support bit |
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|
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"\n\ttest $0x02000000, %%edx" |
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"\n\tjz test3DNow" // branch if SSE not available |
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|
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"\n\tor $0x08, %%esi" // otherwise add SSE support bit |
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|
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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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|
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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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|
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"\n\tor $0x02, %%esi" // otherwise add 3DNow support bit |
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|
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"\n\tend:" |
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|
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"\n\tmov %%esi, %0" |
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|
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: "=r" (res) |
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: /* no inputs */ |
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: "%edx", "%eax", "%ecx", "%esi" ); |
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|
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return res & ~_dwDisabledISA; |
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#endif |
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} |
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