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comparison: media/libsoundtouch/src/cpu_detect_x86.cpp
media/libsoundtouch/src/cpu_detect_x86.cpp
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| 1 //////////////////////////////////////////////////////////////////////////////// | |
| 2 /// | |
| 3 /// Generic version of the x86 CPU extension detection routine. | |
| 4 /// | |
| 5 /// This file is for GNU & other non-Windows compilers, see 'cpu_detect_x86_win.cpp' | |
| 6 /// for the Microsoft compiler version. | |
| 7 /// | |
| 8 /// Author : Copyright (c) Olli Parviainen | |
| 9 /// Author e-mail : oparviai 'at' iki.fi | |
| 10 /// SoundTouch WWW: http://www.surina.net/soundtouch | |
| 11 /// | |
| 12 //////////////////////////////////////////////////////////////////////////////// | |
| 13 // | |
| 14 // Last changed : $Date: 2014-01-07 12:24:28 -0600 (Tue, 07 Jan 2014) $ | |
| 15 // File revision : $Revision: 4 $ | |
| 16 // | |
| 17 // $Id: cpu_detect_x86.cpp 183 2014-01-07 18:24:28Z oparviai $ | |
| 18 // | |
| 19 //////////////////////////////////////////////////////////////////////////////// | |
| 20 // | |
| 21 // License : | |
| 22 // | |
| 23 // SoundTouch audio processing library | |
| 24 // Copyright (c) Olli Parviainen | |
| 25 // | |
| 26 // This library is free software; you can redistribute it and/or | |
| 27 // modify it under the terms of the GNU Lesser General Public | |
| 28 // License as published by the Free Software Foundation; either | |
| 29 // version 2.1 of the License, or (at your option) any later version. | |
| 30 // | |
| 31 // This library is distributed in the hope that it will be useful, | |
| 32 // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 33 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 34 // Lesser General Public License for more details. | |
| 35 // | |
| 36 // You should have received a copy of the GNU Lesser General Public | |
| 37 // License along with this library; if not, write to the Free Software | |
| 38 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 39 // | |
| 40 //////////////////////////////////////////////////////////////////////////////// | |
| 41 | |
| 42 #include "cpu_detect.h" | |
| 43 #include "STTypes.h" | |
| 44 | |
| 45 | |
| 46 #if defined(SOUNDTOUCH_ALLOW_X86_OPTIMIZATIONS) | |
| 47 #if defined(__GNUC__) && defined(HAVE_CPUID_H) | |
| 48 // gcc and clang | |
| 49 #include "cpuid.h" | |
| 50 #elif defined(_M_IX86) | |
| 51 // windows non-gcc | |
| 52 #include <intrin.h> | |
| 53 #endif | |
| 54 | |
| 55 #define bit_MMX (1 << 23) | |
| 56 #define bit_SSE (1 << 25) | |
| 57 #define bit_SSE2 (1 << 26) | |
| 58 #endif | |
| 59 | |
| 60 | |
| 61 ////////////////////////////////////////////////////////////////////////////// | |
| 62 // | |
| 63 // processor instructions extension detection routines | |
| 64 // | |
| 65 ////////////////////////////////////////////////////////////////////////////// | |
| 66 | |
| 67 // Flag variable indicating whick ISA extensions are disabled (for debugging) | |
| 68 static uint _dwDisabledISA = 0x00; // 0xffffffff; //<- use this to disable all extensions | |
| 69 | |
| 70 // Disables given set of instruction extensions. See SUPPORT_... defines. | |
| 71 void disableExtensions(uint dwDisableMask) | |
| 72 { | |
| 73 _dwDisabledISA = dwDisableMask; | |
| 74 } | |
| 75 | |
| 76 | |
| 77 | |
| 78 /// Checks which instruction set extensions are supported by the CPU. | |
| 79 uint detectCPUextensions(void) | |
| 80 { | |
| 81 /// If building for a 64bit system (no Itanium) and the user wants optimizations. | |
| 82 /// Return the OR of SUPPORT_{MMX,SSE,SSE2}. 11001 or 0x19. | |
| 83 /// Keep the _dwDisabledISA test (2 more operations, could be eliminated). | |
| 84 #if ((defined(__GNUC__) && defined(__x86_64__)) \ | |
| 85 || defined(_M_X64)) \ | |
| 86 && defined(SOUNDTOUCH_ALLOW_X86_OPTIMIZATIONS) | |
| 87 return 0x19 & ~_dwDisabledISA; | |
| 88 | |
| 89 /// If building for a 32bit system and the user wants optimizations. | |
| 90 /// Keep the _dwDisabledISA test (2 more operations, could be eliminated). | |
| 91 #elif ((defined(__GNUC__) && defined(__i386__)) \ | |
| 92 || defined(_M_IX86)) \ | |
| 93 && defined(SOUNDTOUCH_ALLOW_X86_OPTIMIZATIONS) | |
| 94 | |
| 95 if (_dwDisabledISA == 0xffffffff) return 0; | |
| 96 | |
| 97 uint res = 0; | |
| 98 | |
| 99 #if !defined(__GNUC__) | |
| 100 // Window / VS version of cpuid. Notice that Visual Studio 2005 or later required | |
| 101 // for __cpuid intrinsic support. | |
| 102 int reg[4] = {-1}; | |
| 103 | |
| 104 // Check if no cpuid support. | |
| 105 __cpuid(reg,0); | |
| 106 if ((unsigned int)reg[0] == 0) return 0; // always disable extensions. | |
| 107 | |
| 108 __cpuid(reg,1); | |
| 109 if ((unsigned int)reg[3] & bit_MMX) res = res | SUPPORT_MMX; | |
| 110 if ((unsigned int)reg[3] & bit_SSE) res = res | SUPPORT_SSE; | |
| 111 if ((unsigned int)reg[3] & bit_SSE2) res = res | SUPPORT_SSE2; | |
| 112 #elif defined(HAVE_CPUID_H) | |
| 113 // GCC version of cpuid. Requires GCC 4.3.0 or later for __cpuid intrinsic support. | |
| 114 uint eax, ebx, ecx, edx; // unsigned int is the standard type. uint is defined by the compiler and not guaranteed to be portable. | |
| 115 | |
| 116 // Check if no cpuid support. | |
| 117 if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx)) return 0; // always disable extensions. | |
| 118 | |
| 119 if (edx & bit_MMX) res = res | SUPPORT_MMX; | |
| 120 if (edx & bit_SSE) res = res | SUPPORT_SSE; | |
| 121 if (edx & bit_SSE2) res = res | SUPPORT_SSE2; | |
| 122 #else | |
| 123 // Compatible with GCC but no cpuid.h. | |
| 124 return 0; | |
| 125 #endif | |
| 126 | |
| 127 return res & ~_dwDisabledISA; | |
| 128 | |
| 129 #else | |
| 130 | |
| 131 /// One of these is true: | |
| 132 /// 1) We don't want optimizations. | |
| 133 /// 2) Using an unsupported compiler. | |
| 134 /// 3) Running on a non-x86 platform. | |
| 135 return 0; | |
| 136 | |
| 137 #endif | |
| 138 } |
