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130 lines
4.3 KiB
130 lines
4.3 KiB
//////////////////////////////////////////////////////////////////////////////// |
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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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// 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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#endif |
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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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////////////////////////////////////////////////////////////////////////////// |
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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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