138 lines
4.6 KiB
C++
Executable file
138 lines
4.6 KiB
C++
Executable file
////////////////////////////////////////////////////////////////////////////////
|
|
///
|
|
/// 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
|
|
///
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Last changed : $Date: 2014-01-07 20:24:28 +0200 (ti, 07 tammi 2014) $
|
|
// File revision : $Revision: 4 $
|
|
//
|
|
// $Id: cpu_detect_x86.cpp 183 2014-01-07 18:24:28Z oparviai $
|
|
//
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// 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(__i386__)
|
|
// gcc
|
|
#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__)
|
|
// 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
|
|
// 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;
|
|
|
|
#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
|
|
}
|