Detect CPU instructions

static void initSIMD()

{

    static bool isCpuDetected = false;

    if(isCpuDetected)

    {

        return;

    }

    dewarpWithRotatedSrcPtr = &dewarpWithRotatedSrc_C;

#ifdef __x86_64

    //  Misc.

    bool HW_MMX = false;

    bool HW_x64 = false;

    bool HW_ABM = false;      // Advanced Bit Manipulation

    bool HW_RDRAND = false;

    bool HW_BMI1 = false;

    bool HW_BMI2 = false;

    bool HW_ADX = false;

    bool HW_PREFETCHWT1 = false;

    //  SIMD: 128-bit

    bool HW_SSE = false;

    bool HW_SSE2 = false;

    bool HW_SSE3 = false;

    bool HW_SSSE3 = false;

    bool HW_SSE41 = false;

    bool HW_SSE42 = false;

    bool HW_SSE4a = false;

    bool HW_AES = false;

    bool HW_SHA = false;

    //  SIMD: 256-bit

    bool HW_AVX = false;

    bool HW_XOP = false;

    bool HW_FMA3 = false;

    bool HW_FMA4 = false;

    bool HW_AVX2 = false;

    //  SIMD: 512-bit

    bool HW_AVX512F = false;    //  AVX512 Foundation

    bool HW_AVX512CD = false;   //  AVX512 Conflict Detection

    bool HW_AVX512PF = false;   //  AVX512 Prefetch

    bool HW_AVX512ER = false;   //  AVX512 Exponential + Reciprocal

    bool HW_AVX512VL = false;   //  AVX512 Vector Length Extensions

    bool HW_AVX512BW = false;   //  AVX512 Byte + Word

    bool HW_AVX512DQ = false;   //  AVX512 Doubleword + Quadword

    bool HW_AVX512IFMA = false; //  AVX512 Integer 52-bit Fused Multiply-Add

    bool HW_AVX512VBMI = false; //  AVX512 Vector Byte Manipulation Instructions

    int info[4];

    cpuid(info, 0);

    int nIds = info[0];

    cpuid(info, 0x80000000);

    unsigned nExIds = info[0];

    //  Detect Features

    if (nIds >= 0x00000001)

    {

        cpuid(info,0x00000001);

        HW_MMX    = (info[3] & ((int)1 << 23)) != 0;

        HW_SSE    = (info[3] & ((int)1 << 25)) != 0;

        HW_SSE2   = (info[3] & ((int)1 << 26)) != 0;

        HW_SSE3   = (info[2] & ((int)1 <<  0)) != 0;

        HW_SSSE3  = (info[2] & ((int)1 <<  9)) != 0;

        HW_SSE41  = (info[2] & ((int)1 << 19)) != 0;

        HW_SSE42  = (info[2] & ((int)1 << 20)) != 0;

        HW_AES    = (info[2] & ((int)1 << 25)) != 0;

        HW_AVX    = (info[2] & ((int)1 << 28)) != 0;

        HW_FMA3   = (info[2] & ((int)1 << 12)) != 0;

        HW_RDRAND = (info[2] & ((int)1 << 30)) != 0;

    }

    if (nIds >= 0x00000007)

    {

        cpuid(info,0x00000007);

        HW_AVX2   = (info[1] & ((int)1 <<  5)) != 0;

        HW_BMI1        = (info[1] & ((int)1 <<  3)) != 0;

        HW_BMI2        = (info[1] & ((int)1 <<  8)) != 0;

        HW_ADX         = (info[1] & ((int)1 << 19)) != 0;

        HW_SHA         = (info[1] & ((int)1 << 29)) != 0;

        HW_PREFETCHWT1 = (info[2] & ((int)1 <<  0)) != 0;

        HW_AVX512F     = (info[1] & ((int)1 << 16)) != 0;

        HW_AVX512CD    = (info[1] & ((int)1 << 28)) != 0;

        HW_AVX512PF    = (info[1] & ((int)1 << 26)) != 0;

        HW_AVX512ER    = (info[1] & ((int)1 << 27)) != 0;

        HW_AVX512VL    = (info[1] & ((int)1 << 31)) != 0;

        HW_AVX512BW    = (info[1] & ((int)1 << 30)) != 0;

        HW_AVX512DQ    = (info[1] & ((int)1 << 17)) != 0;

        HW_AVX512IFMA  = (info[1] & ((int)1 << 21)) != 0;

        HW_AVX512VBMI  = (info[2] & ((int)1 <<  1)) != 0;

    }

    if (nExIds >= 0x80000001)

    {

        cpuid(info,0x80000001);

        HW_x64   = (info[3] & ((int)1 << 29)) != 0;

        HW_ABM   = (info[2] & ((int)1 <<  5)) != 0;

        HW_SSE4a = (info[2] & ((int)1 <<  6)) != 0;

        HW_FMA4  = (info[2] & ((int)1 << 16)) != 0;

        HW_XOP   = (info[2] & ((int)1 << 11)) != 0;

    }

    isCpuDetected = true;

    if(HW_AVX2)

    {

        LogSystem::i("TAG", "");

        dewarpWithRotatedSrcPtr = &dewarpWithRotatedSrc_AVX2;

    }

    else if(HW_SSE2)

    {

        dewarpWithRotatedSrcPtr = &dewarpWithRotatedSrc_SSE2;

    }

#endif

}