1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libsoundtouch/src/cpu_detect_x86.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,138 @@
1.4 +////////////////////////////////////////////////////////////////////////////////
1.5 +///
1.6 +/// Generic version of the x86 CPU extension detection routine.
1.7 +///
1.8 +/// This file is for GNU & other non-Windows compilers, see 'cpu_detect_x86_win.cpp'
1.9 +/// for the Microsoft compiler version.
1.10 +///
1.11 +/// Author : Copyright (c) Olli Parviainen
1.12 +/// Author e-mail : oparviai 'at' iki.fi
1.13 +/// SoundTouch WWW: http://www.surina.net/soundtouch
1.14 +///
1.15 +////////////////////////////////////////////////////////////////////////////////
1.16 +//
1.17 +// Last changed : $Date: 2014-01-07 12:24:28 -0600 (Tue, 07 Jan 2014) $
1.18 +// File revision : $Revision: 4 $
1.19 +//
1.20 +// $Id: cpu_detect_x86.cpp 183 2014-01-07 18:24:28Z oparviai $
1.21 +//
1.22 +////////////////////////////////////////////////////////////////////////////////
1.23 +//
1.24 +// License :
1.25 +//
1.26 +// SoundTouch audio processing library
1.27 +// Copyright (c) Olli Parviainen
1.28 +//
1.29 +// This library is free software; you can redistribute it and/or
1.30 +// modify it under the terms of the GNU Lesser General Public
1.31 +// License as published by the Free Software Foundation; either
1.32 +// version 2.1 of the License, or (at your option) any later version.
1.33 +//
1.34 +// This library is distributed in the hope that it will be useful,
1.35 +// but WITHOUT ANY WARRANTY; without even the implied warranty of
1.36 +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
1.37 +// Lesser General Public License for more details.
1.38 +//
1.39 +// You should have received a copy of the GNU Lesser General Public
1.40 +// License along with this library; if not, write to the Free Software
1.41 +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
1.42 +//
1.43 +////////////////////////////////////////////////////////////////////////////////
1.44 +
1.45 +#include "cpu_detect.h"
1.46 +#include "STTypes.h"
1.47 +
1.48 +
1.49 +#if defined(SOUNDTOUCH_ALLOW_X86_OPTIMIZATIONS)
1.50 + #if defined(__GNUC__) && defined(HAVE_CPUID_H)
1.51 + // gcc and clang
1.52 + #include "cpuid.h"
1.53 + #elif defined(_M_IX86)
1.54 + // windows non-gcc
1.55 + #include <intrin.h>
1.56 + #endif
1.57 +
1.58 + #define bit_MMX (1 << 23)
1.59 + #define bit_SSE (1 << 25)
1.60 + #define bit_SSE2 (1 << 26)
1.61 +#endif
1.62 +
1.63 +
1.64 +//////////////////////////////////////////////////////////////////////////////
1.65 +//
1.66 +// processor instructions extension detection routines
1.67 +//
1.68 +//////////////////////////////////////////////////////////////////////////////
1.69 +
1.70 +// Flag variable indicating whick ISA extensions are disabled (for debugging)
1.71 +static uint _dwDisabledISA = 0x00; // 0xffffffff; //<- use this to disable all extensions
1.72 +
1.73 +// Disables given set of instruction extensions. See SUPPORT_... defines.
1.74 +void disableExtensions(uint dwDisableMask)
1.75 +{
1.76 + _dwDisabledISA = dwDisableMask;
1.77 +}
1.78 +
1.79 +
1.80 +
1.81 +/// Checks which instruction set extensions are supported by the CPU.
1.82 +uint detectCPUextensions(void)
1.83 +{
1.84 +/// If building for a 64bit system (no Itanium) and the user wants optimizations.
1.85 +/// Return the OR of SUPPORT_{MMX,SSE,SSE2}. 11001 or 0x19.
1.86 +/// Keep the _dwDisabledISA test (2 more operations, could be eliminated).
1.87 +#if ((defined(__GNUC__) && defined(__x86_64__)) \
1.88 + || defined(_M_X64)) \
1.89 + && defined(SOUNDTOUCH_ALLOW_X86_OPTIMIZATIONS)
1.90 + return 0x19 & ~_dwDisabledISA;
1.91 +
1.92 +/// If building for a 32bit system and the user wants optimizations.
1.93 +/// Keep the _dwDisabledISA test (2 more operations, could be eliminated).
1.94 +#elif ((defined(__GNUC__) && defined(__i386__)) \
1.95 + || defined(_M_IX86)) \
1.96 + && defined(SOUNDTOUCH_ALLOW_X86_OPTIMIZATIONS)
1.97 +
1.98 + if (_dwDisabledISA == 0xffffffff) return 0;
1.99 +
1.100 + uint res = 0;
1.101 +
1.102 +#if !defined(__GNUC__)
1.103 + // Window / VS version of cpuid. Notice that Visual Studio 2005 or later required
1.104 + // for __cpuid intrinsic support.
1.105 + int reg[4] = {-1};
1.106 +
1.107 + // Check if no cpuid support.
1.108 + __cpuid(reg,0);
1.109 + if ((unsigned int)reg[0] == 0) return 0; // always disable extensions.
1.110 +
1.111 + __cpuid(reg,1);
1.112 + if ((unsigned int)reg[3] & bit_MMX) res = res | SUPPORT_MMX;
1.113 + if ((unsigned int)reg[3] & bit_SSE) res = res | SUPPORT_SSE;
1.114 + if ((unsigned int)reg[3] & bit_SSE2) res = res | SUPPORT_SSE2;
1.115 +#elif defined(HAVE_CPUID_H)
1.116 + // GCC version of cpuid. Requires GCC 4.3.0 or later for __cpuid intrinsic support.
1.117 + uint eax, ebx, ecx, edx; // unsigned int is the standard type. uint is defined by the compiler and not guaranteed to be portable.
1.118 +
1.119 + // Check if no cpuid support.
1.120 + if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx)) return 0; // always disable extensions.
1.121 +
1.122 + if (edx & bit_MMX) res = res | SUPPORT_MMX;
1.123 + if (edx & bit_SSE) res = res | SUPPORT_SSE;
1.124 + if (edx & bit_SSE2) res = res | SUPPORT_SSE2;
1.125 +#else
1.126 + // Compatible with GCC but no cpuid.h.
1.127 + return 0;
1.128 +#endif
1.129 +
1.130 + return res & ~_dwDisabledISA;
1.131 +
1.132 +#else
1.133 +
1.134 +/// One of these is true:
1.135 +/// 1) We don't want optimizations.
1.136 +/// 2) Using an unsupported compiler.
1.137 +/// 3) Running on a non-x86 platform.
1.138 + return 0;
1.139 +
1.140 +#endif
1.141 +}
