#pragma once

#include <cstddef>
#include <cpuid.h>


#ifndef __cplusplus
#error This header requires C++
#endif

//
//  CPU related functions
//
inline bool PerfsCPUSIMDReady(void) noexcept {
#if !defined(DISABLE_INTRINSICS)
    int CPUInfo[4] = {-1};

#if defined(__GNUC__)
    __cpuid(0, CPUInfo[0], CPUInfo[1], CPUInfo[2], CPUInfo[3]);
#else
    __cpuid(CPUInfo, 0);
#endif

#ifdef __AVX2__
    if (CPUInfo[0] < 7)
        return false;
#else
    if (CPUInfo[0] < 1)
        return false;
#endif

#if defined(__GNUC__)
    __cpuid(1, CPUInfo[0], CPUInfo[1], CPUInfo[2], CPUInfo[3]);
#else
    __cpuid(CPUInfo, 1);
#endif

#if defined(__AVX2__) || defined(AVX2_INTRINSICS)
    // The compiler can emit FMA3 instructions even without explicit intrinsics use
    if ((CPUInfo[2] & 0x38081001) != 0x38081001)
        return false; // No F16C/AVX/OSXSAVE/SSE4.1/FMA3/SSE3 support
#elif defined(FMA3_INTRINSICS) && defined(F16C_INTRINSICS)
    if ((CPUInfo[2] & 0x38081001) != 0x38081001)
        return false; // No F16C/AVX/OSXSAVE/SSE4.1/FMA3/SSE3 support
#elif defined(FMA3_INTRINSICS)
    if ((CPUInfo[2] & 0x18081001) != 0x18081001)
        return false; // No AVX/OSXSAVE/SSE4.1/FMA3/SSE3 support
#elif defined(F16C_INTRINSICS)
    if ((CPUInfo[2] & 0x38080001) != 0x38080001)
        return false; // No F16C/AVX/OSXSAVE/SSE4.1/SSE3 support
#elif defined(__AVX__) || defined(AVX_INTRINSICS)
    if ((CPUInfo[2] & 0x18080001) != 0x18080001)
        return false; // No AVX/OSXSAVE/SSE4.1/SSE3 support
#elif defined(SSE4_INTRINSICS)
    if ((CPUInfo[2] & 0x80001) != 0x80001)
        return false; // No SSE3/SSE4.1 support
#elif defined(SSE3_INTRINSICS)
    if (!(CPUInfo[2] & 0x1))
        return false; // No SSE3 support
#endif

    // The x64 processor model requires SSE2 support, but no harm in checking
    if ((CPUInfo[3] & 0x6000000) != 0x6000000)
        return false; // No SSE2/SSE support

#if defined(__AVX2__) || defined(AVX2_INTRINSICS)
#if defined(__GNUC__)
    __cpuid_count(7, 0, CPUInfo[0], CPUInfo[1], CPUInfo[2], CPUInfo[3]);
#else
    __cpuidex(CPUInfo, 7, 0);
#endif
    if (!(CPUInfo[1] & 0x20))
        return false; // No AVX2 support
#endif
    return true;
#endif
    return true;
}

//
//  RAM related functions
//
const size_t PerfsGetVirtMem(void);
const size_t PerfsGetPhysMem(void);