mirror of
https://github.com/RPCS3/soundtouch.git
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140 lines
4.8 KiB
C++
140 lines
4.8 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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///
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/// Win32 version of the x86 CPU detect routine.
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///
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/// This file is to be compiled in Windows platform with Microsoft Visual C++
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/// Compiler. Please see 'cpu_detect_x86_gcc.cpp' for the gcc compiler version
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/// for all GNU platforms.
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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 : $Date$
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// File revision : $Revision: 4 $
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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 "cpu_detect.h"
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#ifndef WIN32
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#error wrong platform - this source code file is exclusively for Win32 platform
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#endif
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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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uint res = 0;
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if (_dwDisabledISA == 0xffffffff) return 0;
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#ifndef _M_X64
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// 32bit compilation, detect CPU capabilities with inline assembler.
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__asm
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{
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; check if 'cpuid' instructions is available by toggling eflags bit 21
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;
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xor esi, esi ; clear esi = result register
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pushfd ; save eflags to stack
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mov eax,dword ptr [esp] ; load eax from stack (with eflags)
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mov ecx, eax ; save the original eflags values to ecx
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xor eax, 0x00200000 ; toggle bit 21
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mov dword ptr [esp],eax ; store toggled eflags to stack
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popfd ; load eflags from stack
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pushfd ; save updated eflags to stack
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mov eax,dword ptr [esp] ; load eax from stack
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popfd ; pop stack to restore stack pointer
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xor edx, edx ; clear edx for defaulting no mmx
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cmp eax, ecx ; compare to original eflags values
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jz 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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mov eax, 1
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cpuid
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test edx, 0x00800000
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jz end ; branch if MMX not available
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or esi, SUPPORT_MMX ; otherwise add MMX support bit
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test edx, 0x02000000
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jz test3DNow ; branch if SSE not available
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or esi, SUPPORT_SSE ; otherwise add SSE support bit
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test3DNow:
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; test for precense of AMD extensions
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mov eax, 0x80000000
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cpuid
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cmp eax, 0x80000000
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jbe end ; branch if no AMD extensions detected
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; test for precense of 3DNow! extension
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mov eax, 0x80000001
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cpuid
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test edx, 0x80000000
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jz end ; branch if 3DNow! not detected
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or esi, SUPPORT_3DNOW ; otherwise add 3DNow support bit
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end:
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mov res, esi
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}
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#else
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// Visual C++ 64bit compilation doesn't support inline assembler. However,
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// all x64 compatible CPUs support MMX & SSE extensions.
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res = SUPPORT_MMX | SUPPORT_SSE | SUPPORT_SSE2;
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#endif
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return res & ~_dwDisabledISA;
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}
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