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

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*==LICENSE==*/

//////////////////////////////////////////////////////////////////////
//
// hsCpuID - Processor feature detection and function dispatcher
//
//
//     == Example Usage ==
//
//  #ifdef HS_SIMD_INCLUDE
//  #   include HS_SIMD_INCLUDE
//  #endif
//
//  float my_func_fpu() {
//    ...
//  }
//
//  float my_func_avx() {
//  #ifdef HS_AVX
//    ...
//  #endif
//  }
//
//
//  typedef float(*func_ptr)();
//  static hsFunctionDispatcher<func_ptr> my_func;
//
//  hsFunctionDispatcher<func_ptr> my_func(my_func_fpu, 0, 0, 0, 0, 0, 0, my_func_avx);
//  my_func();
//
//////////////////////////////////////////////////////////////////////



#ifndef hsCpuID_inc
#define hsCpuID_inc

#if defined __AVX2__ || _MSC_VER >= 1600
#define HS_AVX2
#ifndef HS_SIMD_INCLUDE
# define HS_SIMD_INCLUDE "immintrin.h"
#endif
#endif
#if defined __AVX__ || _MSC_VER >= 1600
#define HS_AVX
#ifndef HS_SIMD_INCLUDE
# define HS_SIMD_INCLUDE "immintrin.h"
#endif
#endif
#if defined __SSE4_2__ || _MSC_VER >= 1600
#define HS_SSE42
#ifndef HS_SIMD_INCLUDE
# define HS_SIMD_INCLUDE "nmmintrin.h"
#endif
#endif
#if defined __SSE4_1__ || _MSC_VER >= 1600
#define HS_SSE41
#ifndef HS_SIMD_INCLUDE
# define HS_SIMD_INCLUDE "smmintrin.h"
#endif
#endif
#if defined __SSSE3__ || _MSC_VER >= 1600
#define HS_SSSE3
#ifndef HS_SIMD_INCLUDE
# define HS_SIMD_INCLUDE "tmmintrin.h"
#endif
#endif
#if defined __SSE3__ || _MSC_VER >= 1400
#define HS_SSE3
#ifndef HS_SIMD_INCLUDE
# define HS_SIMD_INCLUDE "pmmintrin.h"
#endif
#endif
#if defined __SSE2__ || _MSC_VER >= 1300
#define HS_SSE2
#ifndef HS_SIMD_INCLUDE
# define HS_SIMD_INCLUDE "emmintrin.h"
#endif
#endif
#if defined __SSE__ || _MSC_VER >= 1300
#define HS_SSE1
#ifndef HS_SIMD_INCLUDE
# define HS_SIMD_INCLUDE "xmmintrin.h"
#endif
#endif


struct hsCpuId {
    bool has_sse1;
    bool has_sse2;
    bool has_sse3;
    bool has_ssse3;
    bool has_sse41;
    bool has_sse42;
    bool has_avx;
    bool has_avx2;

    hsCpuId();
    static const hsCpuId& Instance();
};

template <typename func_ptr>
struct hsCpuFunctionDispatcher {
    hsCpuFunctionDispatcher(func_ptr fpu,
                            func_ptr sse1 = nullptr,
                            func_ptr sse2 = nullptr,
                            func_ptr sse3 = nullptr,
                            func_ptr ssse3 = nullptr,
                            func_ptr sse41 = nullptr,
                            func_ptr sse42 = nullptr,
                            func_ptr avx = nullptr,
                            func_ptr avx2 = nullptr)
    {
        hsAssert(fpu, "FPU fallback function required.");
        const hsCpuId& cpu = hsCpuId::Instance();
#ifdef HS_AVX2
        if (cpu.has_avx2 && avx2) {
            call = avx2;
        } else
#endif
#ifdef HS_AVX
        if (cpu.has_avx && avx) {
            call = avx;
        } else
#endif
#ifdef HS_SSE42
        if (cpu.has_sse42 && sse42) {
            call = sse42;
        } else
#endif
#ifdef HS_SSE41
        if (cpu.has_sse41 && sse41) {
            call = sse41;
        } else
#endif
#ifdef HS_SSSE3
        if (cpu.has_ssse3 && ssse3) {
            call = ssse3;
        } else
#endif
#ifdef HS_SSE3
        if (cpu.has_sse3 && sse3) {
            call = sse3;
        } else
#endif
#ifdef HS_SSE2
        if (cpu.has_sse2 && sse2) {
            call = sse2;
        } else
#endif
#ifdef HS_SSE1
        if (cpu.has_sse1 && sse1) {
            call = sse1;
        } else
#endif
        {
            call = fpu;
        }
    };
    func_ptr call;
};


#endif  // hsCpuID_inc