DirectXMath/Extensions/DirectXMathBE.h

//-------------------------------------------------------------------------------------
// DirectXMathBE.h -- Big-endian swap extensions for SIMD C++ Math library
//
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
//
// http://go.microsoft.com/fwlink/?LinkID=615560
//-------------------------------------------------------------------------------------

#pragma once

#if (defined(_M_IX86) || defined(_M_X64) || __i386__ || __x86_64__) && !defined(_M_HYBRID_X86_ARM64) && !defined(_M_ARM64EC)
#include <tmmintrin.h>
#endif

#include <DirectXMath.h>

namespace DirectX
{

inline XMVECTOR XM_CALLCONV XMVectorEndian
(
    FXMVECTOR V 
)
{
#if defined(_XM_ARM_NEON_INTRINSICS_) && !defined(_XM_NO_INTRINSICS_)
    static const XMVECTORU32 idx = { { { 0x00010203u, 0x04050607u, 0x08090A0Bu, 0x0C0D0E0Fu } } };

    uint8x8x2_t tbl;
    tbl.val[0] = vreinterpret_u8_f32(vget_low_f32(V));
    tbl.val[1] = vreinterpret_u8_f32(vget_high_f32(V));

    const uint8x8_t rL = vtbl2_u8(tbl, vget_low_u32(idx));
    const uint8x8_t rH = vtbl2_u8(tbl, vget_high_u32(idx));
    return vcombine_f32(vreinterpret_f32_u8(rL), vreinterpret_f32_u8(rH));
#else
    XMVECTORU32 E;
    E.v = V;
    uint32_t value = E.u[0];
    E.u[0] = ( (value << 24) | ((value & 0xFF00) << 8) | ((value & 0xFF0000) >> 8) | (value >> 24) );
    value = E.u[1];
    E.u[1] = ( (value << 24) | ((value & 0xFF00) << 8) | ((value & 0xFF0000) >> 8) | (value >> 24) );
    value = E.u[2];
    E.u[2] = ( (value << 24) | ((value & 0xFF00) << 8) | ((value & 0xFF0000) >> 8) | (value >> 24) );
    value = E.u[3];
    E.u[3] = ( (value << 24) | ((value & 0xFF00) << 8) | ((value & 0xFF0000) >> 8) | (value >> 24) );
    return E.v;
#endif
}


#if (defined(_M_IX86) || defined(_M_X64) || __i386__ || __x86_64__) && !defined(_M_HYBRID_X86_ARM64)
namespace SSSE3
{

inline bool XMVerifySSSE3Support()
{
    // Should return true on AMD Bulldozer, Intel Core i7/i5/i3, Intel Atom, or later processors

    // See http://msdn.microsoft.com/en-us/library/hskdteyh.aspx
    int CPUInfo[4] = { -1 };
#if (defined(__clang__) || defined(__GNUC__)) && defined(__cpuid)
    __cpuid(0, CPUInfo[0], CPUInfo[1], CPUInfo[2], CPUInfo[3]);
#else
    __cpuid(CPUInfo, 0);
#endif

    if ( CPUInfo[0] < 1  )
        return false;

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

    // Check for SSSE3 instruction set.
    return ( (CPUInfo[2] & 0x200) != 0 );
}

inline XMVECTOR XM_CALLCONV XMVectorEndian
(
    FXMVECTOR V 
)
{
    static const XMVECTORU32 idx = { { { 0x00010203u, 0x04050607u, 0x08090A0Bu, 0x0C0D0E0Fu } } };
   
    __m128i Result = _mm_shuffle_epi8( _mm_castps_si128(V), idx );
    return _mm_castsi128_ps( Result );
}

} // namespace SSSE3
#endif // X86 || X64

} // namespace DirectX