diff options
Diffstat (limited to 'media/libsoundtouch/src/cpu_detect_x86.cpp')
| -rw-r--r-- | media/libsoundtouch/src/cpu_detect_x86.cpp | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/media/libsoundtouch/src/cpu_detect_x86.cpp b/media/libsoundtouch/src/cpu_detect_x86.cpp new file mode 100644 index 0000000000..f0f026b20d --- /dev/null +++ b/media/libsoundtouch/src/cpu_detect_x86.cpp @@ -0,0 +1,130 @@ +//////////////////////////////////////////////////////////////////////////////// +/// +/// Generic version of the x86 CPU extension detection routine. +/// +/// This file is for GNU & other non-Windows compilers, see 'cpu_detect_x86_win.cpp' +/// for the Microsoft compiler version. +/// +/// Author : Copyright (c) Olli Parviainen +/// Author e-mail : oparviai 'at' iki.fi +/// SoundTouch WWW: http://www.surina.net/soundtouch +/// +//////////////////////////////////////////////////////////////////////////////// +// +// License : +// +// SoundTouch audio processing library +// Copyright (c) Olli Parviainen +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 2.1 of the License, or (at your option) any later version. +// +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public +// License along with this library; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +// +//////////////////////////////////////////////////////////////////////////////// + +#include "cpu_detect.h" +#include "STTypes.h" + + +#if defined(SOUNDTOUCH_ALLOW_X86_OPTIMIZATIONS) + #if defined(__GNUC__) && defined(HAVE_CPUID_H) + // gcc and clang + #include "cpuid.h" + #elif defined(_M_IX86) + // windows non-gcc + #include <intrin.h> + #endif + + #define bit_MMX (1 << 23) + #define bit_SSE (1 << 25) + #define bit_SSE2 (1 << 26) +#endif + + +////////////////////////////////////////////////////////////////////////////// +// +// processor instructions extension detection routines +// +////////////////////////////////////////////////////////////////////////////// + +// Flag variable indicating whick ISA extensions are disabled (for debugging) +static uint _dwDisabledISA = 0x00; // 0xffffffff; //<- use this to disable all extensions + +// Disables given set of instruction extensions. See SUPPORT_... defines. +void disableExtensions(uint dwDisableMask) +{ + _dwDisabledISA = dwDisableMask; +} + + +/// Checks which instruction set extensions are supported by the CPU. +uint detectCPUextensions(void) +{ +/// If building for a 64bit system (no Itanium) and the user wants optimizations. +/// Return the OR of SUPPORT_{MMX,SSE,SSE2}. 11001 or 0x19. +/// Keep the _dwDisabledISA test (2 more operations, could be eliminated). +#if ((defined(__GNUC__) && defined(__x86_64__)) \ + || defined(_M_X64)) \ + && defined(SOUNDTOUCH_ALLOW_X86_OPTIMIZATIONS) + return 0x19 & ~_dwDisabledISA; + +/// If building for a 32bit system and the user wants optimizations. +/// Keep the _dwDisabledISA test (2 more operations, could be eliminated). +#elif ((defined(__GNUC__) && defined(__i386__)) \ + || defined(_M_IX86)) \ + && defined(SOUNDTOUCH_ALLOW_X86_OPTIMIZATIONS) + + if (_dwDisabledISA == 0xffffffff) return 0; + + uint res = 0; + +#if !defined(__GNUC__) + // Window / VS version of cpuid. Notice that Visual Studio 2005 or later required + // for __cpuid intrinsic support. + int reg[4] = {-1}; + + // Check if no cpuid support. + __cpuid(reg,0); + if ((unsigned int)reg[0] == 0) return 0; // always disable extensions. + + __cpuid(reg,1); + if ((unsigned int)reg[3] & bit_MMX) res = res | SUPPORT_MMX; + if ((unsigned int)reg[3] & bit_SSE) res = res | SUPPORT_SSE; + if ((unsigned int)reg[3] & bit_SSE2) res = res | SUPPORT_SSE2; +#elif defined(HAVE_CPUID_H) + // GCC version of cpuid. Requires GCC 4.3.0 or later for __cpuid intrinsic support. + uint eax, ebx, ecx, edx; // unsigned int is the standard type. uint is defined by the compiler and not guaranteed to be portable. + + // Check if no cpuid support. + if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx)) return 0; // always disable extensions. + + if (edx & bit_MMX) res = res | SUPPORT_MMX; + if (edx & bit_SSE) res = res | SUPPORT_SSE; + if (edx & bit_SSE2) res = res | SUPPORT_SSE2; +#else + // Compatible with GCC but no cpuid.h. + return 0; +#endif + + return res & ~_dwDisabledISA; + +#else + +/// One of these is true: +/// 1) We don't want optimizations. +/// 2) Using an unsupported compiler. +/// 3) Running on a non-x86 platform. + return 0; + +#endif +} |