Line data    Source code

       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 18:24:28 +0000 (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           0 : void disableExtensions(uint dwDisableMask)
      72             : {
      73           0 :     _dwDisabledISA = dwDisableMask;
      74           0 : }
      75             : 
      76             : 
      77             : 
      78             : /// Checks which instruction set extensions are supported by the CPU.
      79           0 : 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           0 :     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             : }