CWE-ou-minkata/Sources/Plasma/CoreLib/hsCpuID.cpp

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*==LICENSE==*/

#include "hsCompilerSpecific.h"

#if defined(HAVE_CPUID)
#  if defined(_MSC_VER) || ((defined(_WIN32) || defined(_WIN64)) && defined(__INTEL_COMPILER))
#    include <intrin.h>
#    define MSC_COMPATIBLE
#  elif defined(__GNUC__)
#    include <cpuid.h>
#    define GCC_COMPATIBLE
#  else
#    define SOFTWARE_ONLY
#  endif
#else
#  define SOFTWARE_ONLY
#endif

#include "hsCpuID.h"

hsCpuId::hsCpuId() {
    enum : unsigned int {
        // EAX=1; EDX=:
        sse1_flag  = 1U<<25,
        sse2_flag  = 1U<<26,

        // EAX=1; ECX=:
        sse3_flag  = 1U<<0,
        ssse3_flag = 1U<<9,
        sse41_flag = 1U<<19,
        sse42_flag = 1U<<20,
        avx_flag   = 1U<<28,

        // EAX=7; ECX=0; EBX=:
        avx2_flag  = 1U<<5
    };

    union RegSet {
        struct {
            unsigned int eax, ebx, ecx, edx;
        };
        int array[4];
    };

    RegSet CPUInfo_Features = { 0, 0, 0, 0 };
    RegSet CPUInfo_Ext = { 0, 0, 0, 0 };

    /**
     * Portable implementation of CPUID, successfully tested with:
     *   - Microsoft Visual Studio 2010,
     *   - GNU GCC 4.5,
     *   - Intel C++ Compiler 12.0
     *   - Sun Studio 12,
     *   - AMD x86 Open64 Compiler Suite.
     *
     * Ref: http://primesieve.googlecode.com/svn-history/r388/trunk/soe/cpuid.h
     */
#if defined(MSC_COMPATIBLE)
    __cpuid(CPUInfo_Features.array, 0);

    // check if the CPU supports the cpuid instruction.
    if (CPUInfo_Features.eax != 0) {
        __cpuid(CPUInfo_Features.array, 1);
        __cpuid(CPUInfo_Ext.array, 7);
    }
#elif defined(GCC_COMPATIBLE)
    __get_cpuid(1, &CPUInfo_Features.eax, &CPUInfo_Features.ebx,
                   &CPUInfo_Features.ecx, &CPUInfo_Features.edx);
    __get_cpuid(7, &CPUInfo_Ext.eax, &CPUInfo_Ext.ebx,
                   &CPUInfo_Ext.ecx, &CPUInfo_Ext.edx);
#endif


    has_sse1    = (CPUInfo_Features.edx & sse1_flag)  || false;
    has_sse2    = (CPUInfo_Features.edx & sse2_flag)  || false;
    has_sse3    = (CPUInfo_Features.ecx & sse3_flag)  || false;
    has_ssse3   = (CPUInfo_Features.ecx & ssse3_flag) || false;
    has_sse41   = (CPUInfo_Features.ecx & sse41_flag) || false;
    has_sse42   = (CPUInfo_Features.ecx & sse42_flag) || false;
    has_avx     = (CPUInfo_Features.ecx & avx_flag)   || false;
    has_avx2    = (CPUInfo_Ext.ebx      & avx2_flag)  || false;
}

const hsCpuId& hsCpuId::Instance()
{
    static hsCpuId self;
    return self;
}