media/libsoundtouch/src/cpu_detect_x86.cpp@b8a032363ba2 (annotated)
media/libsoundtouch/src/cpu_detect_x86.cpp
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | //////////////////////////////////////////////////////////////////////////////// |
| michael@0 | 2 | /// |
| michael@0 | 3 | /// Generic version of the x86 CPU extension detection routine. |
| michael@0 | 4 | /// |
| michael@0 | 5 | /// This file is for GNU & other non-Windows compilers, see 'cpu_detect_x86_win.cpp' |
| michael@0 | 6 | /// for the Microsoft compiler version. |
| michael@0 | 7 | /// |
| michael@0 | 8 | /// Author : Copyright (c) Olli Parviainen |
| michael@0 | 9 | /// Author e-mail : oparviai 'at' iki.fi |
| michael@0 | 10 | /// SoundTouch WWW: http://www.surina.net/soundtouch |
| michael@0 | 11 | /// |
| michael@0 | 12 | //////////////////////////////////////////////////////////////////////////////// |
| michael@0 | 13 | // |
| michael@0 | 14 | // Last changed : $Date: 2014-01-07 12:24:28 -0600 (Tue, 07 Jan 2014) $ |
| michael@0 | 15 | // File revision : $Revision: 4 $ |
| michael@0 | 16 | // |
| michael@0 | 17 | // $Id: cpu_detect_x86.cpp 183 2014-01-07 18:24:28Z oparviai $ |
| michael@0 | 18 | // |
| michael@0 | 19 | //////////////////////////////////////////////////////////////////////////////// |
| michael@0 | 20 | // |
| michael@0 | 21 | // License : |
| michael@0 | 22 | // |
| michael@0 | 23 | // SoundTouch audio processing library |
| michael@0 | 24 | // Copyright (c) Olli Parviainen |
| michael@0 | 25 | // |
| michael@0 | 26 | // This library is free software; you can redistribute it and/or |
| michael@0 | 27 | // modify it under the terms of the GNU Lesser General Public |
| michael@0 | 28 | // License as published by the Free Software Foundation; either |
| michael@0 | 29 | // version 2.1 of the License, or (at your option) any later version. |
| michael@0 | 30 | // |
| michael@0 | 31 | // This library is distributed in the hope that it will be useful, |
| michael@0 | 32 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| michael@0 | 33 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| michael@0 | 34 | // Lesser General Public License for more details. |
| michael@0 | 35 | // |
| michael@0 | 36 | // You should have received a copy of the GNU Lesser General Public |
| michael@0 | 37 | // License along with this library; if not, write to the Free Software |
| michael@0 | 38 | // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| michael@0 | 39 | // |
| michael@0 | 40 | //////////////////////////////////////////////////////////////////////////////// |
| michael@0 | 41 | |
| michael@0 | 42 | #include "cpu_detect.h" |
| michael@0 | 43 | #include "STTypes.h" |
| michael@0 | 44 | |
| michael@0 | 45 | |
| michael@0 | 46 | #if defined(SOUNDTOUCH_ALLOW_X86_OPTIMIZATIONS) |
| michael@0 | 47 | #if defined(__GNUC__) && defined(HAVE_CPUID_H) |
| michael@0 | 48 | // gcc and clang |
| michael@0 | 49 | #include "cpuid.h" |
| michael@0 | 50 | #elif defined(_M_IX86) |
| michael@0 | 51 | // windows non-gcc |
| michael@0 | 52 | #include <intrin.h> |
| michael@0 | 53 | #endif |
| michael@0 | 54 | |
| michael@0 | 55 | #define bit_MMX (1 << 23) |
| michael@0 | 56 | #define bit_SSE (1 << 25) |
| michael@0 | 57 | #define bit_SSE2 (1 << 26) |
| michael@0 | 58 | #endif |
| michael@0 | 59 | |
| michael@0 | 60 | |
| michael@0 | 61 | ////////////////////////////////////////////////////////////////////////////// |
| michael@0 | 62 | // |
| michael@0 | 63 | // processor instructions extension detection routines |
| michael@0 | 64 | // |
| michael@0 | 65 | ////////////////////////////////////////////////////////////////////////////// |
| michael@0 | 66 | |
| michael@0 | 67 | // Flag variable indicating whick ISA extensions are disabled (for debugging) |
| michael@0 | 68 | static uint _dwDisabledISA = 0x00; // 0xffffffff; //<- use this to disable all extensions |
| michael@0 | 69 | |
| michael@0 | 70 | // Disables given set of instruction extensions. See SUPPORT_... defines. |
| michael@0 | 71 | void disableExtensions(uint dwDisableMask) |
| michael@0 | 72 | { |
| michael@0 | 73 | _dwDisabledISA = dwDisableMask; |
| michael@0 | 74 | } |
| michael@0 | 75 | |
| michael@0 | 76 | |
| michael@0 | 77 | |
| michael@0 | 78 | /// Checks which instruction set extensions are supported by the CPU. |
| michael@0 | 79 | uint detectCPUextensions(void) |
| michael@0 | 80 | { |
| michael@0 | 81 | /// If building for a 64bit system (no Itanium) and the user wants optimizations. |
| michael@0 | 82 | /// Return the OR of SUPPORT_{MMX,SSE,SSE2}. 11001 or 0x19. |
| michael@0 | 83 | /// Keep the _dwDisabledISA test (2 more operations, could be eliminated). |
| michael@0 | 84 | #if ((defined(__GNUC__) && defined(__x86_64__)) \ |
| michael@0 | 85 | || defined(_M_X64)) \ |
| michael@0 | 86 | && defined(SOUNDTOUCH_ALLOW_X86_OPTIMIZATIONS) |
| michael@0 | 87 | return 0x19 & ~_dwDisabledISA; |
| michael@0 | 88 | |
| michael@0 | 89 | /// If building for a 32bit system and the user wants optimizations. |
| michael@0 | 90 | /// Keep the _dwDisabledISA test (2 more operations, could be eliminated). |
| michael@0 | 91 | #elif ((defined(__GNUC__) && defined(__i386__)) \ |
| michael@0 | 92 | || defined(_M_IX86)) \ |
| michael@0 | 93 | && defined(SOUNDTOUCH_ALLOW_X86_OPTIMIZATIONS) |
| michael@0 | 94 | |
| michael@0 | 95 | if (_dwDisabledISA == 0xffffffff) return 0; |
| michael@0 | 96 | |
| michael@0 | 97 | uint res = 0; |
| michael@0 | 98 | |
| michael@0 | 99 | #if !defined(__GNUC__) |
| michael@0 | 100 | // Window / VS version of cpuid. Notice that Visual Studio 2005 or later required |
| michael@0 | 101 | // for __cpuid intrinsic support. |
| michael@0 | 102 | int reg[4] = {-1}; |
| michael@0 | 103 | |
| michael@0 | 104 | // Check if no cpuid support. |
| michael@0 | 105 | __cpuid(reg,0); |
| michael@0 | 106 | if ((unsigned int)reg[0] == 0) return 0; // always disable extensions. |
| michael@0 | 107 | |
| michael@0 | 108 | __cpuid(reg,1); |
| michael@0 | 109 | if ((unsigned int)reg[3] & bit_MMX) res = res | SUPPORT_MMX; |
| michael@0 | 110 | if ((unsigned int)reg[3] & bit_SSE) res = res | SUPPORT_SSE; |
| michael@0 | 111 | if ((unsigned int)reg[3] & bit_SSE2) res = res | SUPPORT_SSE2; |
| michael@0 | 112 | #elif defined(HAVE_CPUID_H) |
| michael@0 | 113 | // GCC version of cpuid. Requires GCC 4.3.0 or later for __cpuid intrinsic support. |
| michael@0 | 114 | uint eax, ebx, ecx, edx; // unsigned int is the standard type. uint is defined by the compiler and not guaranteed to be portable. |
| michael@0 | 115 | |
| michael@0 | 116 | // Check if no cpuid support. |
| michael@0 | 117 | if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx)) return 0; // always disable extensions. |
| michael@0 | 118 | |
| michael@0 | 119 | if (edx & bit_MMX) res = res | SUPPORT_MMX; |
| michael@0 | 120 | if (edx & bit_SSE) res = res | SUPPORT_SSE; |
| michael@0 | 121 | if (edx & bit_SSE2) res = res | SUPPORT_SSE2; |
| michael@0 | 122 | #else |
| michael@0 | 123 | // Compatible with GCC but no cpuid.h. |
| michael@0 | 124 | return 0; |
| michael@0 | 125 | #endif |
| michael@0 | 126 | |
| michael@0 | 127 | return res & ~_dwDisabledISA; |
| michael@0 | 128 | |
| michael@0 | 129 | #else |
| michael@0 | 130 | |
| michael@0 | 131 | /// One of these is true: |
| michael@0 | 132 | /// 1) We don't want optimizations. |
| michael@0 | 133 | /// 2) Using an unsupported compiler. |
| michael@0 | 134 | /// 3) Running on a non-x86 platform. |
| michael@0 | 135 | return 0; |
| michael@0 | 136 | |
| michael@0 | 137 | #endif |
| michael@0 | 138 | } |
