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138 lines
4.6 KiB
C++
138 lines
4.6 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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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: 2012-11-08 20:44:37 +0200 (Thu, 08 Nov 2012) $
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// File revision : $Revision: 4 $
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//
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// $Id: cpu_detect_x86.cpp 159 2012-11-08 18:44:37Z 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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#include "cpu_detect.h"
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#include "STTypes.h"
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#if defined(SOUNDTOUCH_ALLOW_X86_OPTIMIZATIONS)
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#if defined(__GNUC__) && defined(__i386__)
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// gcc
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#include "cpuid.h"
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#elif defined(_M_IX86)
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// windows non-gcc
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#include <intrin.h>
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#define bit_MMX (1 << 23)
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#define bit_SSE (1 << 25)
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#define bit_SSE2 (1 << 26)
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#endif
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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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/// If building for a 64bit system (no Itanium) and the user wants optimizations.
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/// Return the OR of SUPPORT_{MMX,SSE,SSE2}. 11001 or 0x19.
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/// Keep the _dwDisabledISA test (2 more operations, could be eliminated).
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#if ((defined(__GNUC__) && defined(__x86_64__)) \
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|| defined(_M_X64)) \
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&& defined(SOUNDTOUCH_ALLOW_X86_OPTIMIZATIONS)
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return 0x19 & ~_dwDisabledISA;
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/// If building for a 32bit system and the user wants optimizations.
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/// Keep the _dwDisabledISA test (2 more operations, could be eliminated).
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#elif ((defined(__GNUC__) && defined(__i386__)) \
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|| defined(_M_IX86)) \
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&& defined(SOUNDTOUCH_ALLOW_X86_OPTIMIZATIONS)
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if (_dwDisabledISA == 0xffffffff) return 0;
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uint res = 0;
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#if defined(__GNUC__)
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// GCC version of cpuid. Requires GCC 4.3.0 or later for __cpuid intrinsic support.
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uint eax, ebx, ecx, edx; // unsigned int is the standard type. uint is defined by the compiler and not guaranteed to be portable.
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// Check if no cpuid support.
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if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx)) return 0; // always disable extensions.
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if (edx & bit_MMX) res = res | SUPPORT_MMX;
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if (edx & bit_SSE) res = res | SUPPORT_SSE;
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if (edx & bit_SSE2) res = res | SUPPORT_SSE2;
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#else
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// Window / VS version of cpuid. Notice that Visual Studio 2005 or later required
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// for __cpuid intrinsic support.
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int reg[4] = {-1};
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// Check if no cpuid support.
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__cpuid(reg,0);
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if ((unsigned int)reg[0] == 0) return 0; // always disable extensions.
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__cpuid(reg,1);
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if ((unsigned int)reg[3] & bit_MMX) res = res | SUPPORT_MMX;
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if ((unsigned int)reg[3] & bit_SSE) res = res | SUPPORT_SSE;
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if ((unsigned int)reg[3] & bit_SSE2) res = res | SUPPORT_SSE2;
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#endif
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return res & ~_dwDisabledISA;
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#else
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/// One of these is true:
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/// 1) We don't want optimizations.
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/// 2) Using an unsupported compiler.
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/// 3) Running on a non-x86 platform.
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return 0;
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#endif
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}
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