simd.cpp

// /std:c++latest /O2
struct Quaternion
{
    float x;
    float y;
    float z;
    float w;
};

constexpr const Quaternion dot(const Quaternion & s, const Quaternion & t) noexcept
{
    return Quaternion(
        s.x * t.x,
        s.y * t.y,
        s.z * t.z,
        s.w * t.w
    );
}

// Quaternion const dot(Quaternion const &,Quaternion const &) PROC             ; dot, COMDAT
//         movups  xmm1, XMMWORD PTR [rdx]
//         mov     rax, rcx
//         movups  xmm0, XMMWORD PTR [r8]
//         mulps   xmm1, xmm0
//         movups  XMMWORD PTR [rcx], xmm1
//         ret     0
// Quaternion const dot(Quaternion const &,Quaternion const &) ENDP             ; dot

struct alignas(16) Quaternion
{
    float x;
    float y;
    float z;
    float w;
};

// Quaternion const dot(Quaternion const &,Quaternion const &) PROC             ; dot, COMDAT
//         movss   xmm0, DWORD PTR [rdx]
//         mov     rax, rcx
//         movss   xmm3, DWORD PTR [rdx+4]
//         movss   xmm2, DWORD PTR [rdx+8]
//         movss   xmm1, DWORD PTR [rdx+12]
//         mulss   xmm0, DWORD PTR [r8]
//         mulss   xmm3, DWORD PTR [r8+4]
//         mulss   xmm2, DWORD PTR [r8+8]
//         mulss   xmm1, DWORD PTR [r8+12]
//         movss   DWORD PTR [rcx], xmm0
//         movss   DWORD PTR [rcx+4], xmm3
//         movss   DWORD PTR [rcx+8], xmm2
//         movss   DWORD PTR [rcx+12], xmm1
//         ret     0
// Quaternion const dot(Quaternion const &,Quaternion const &) ENDP             ; dot

struct Quaternion
{
    union
    {
        struct
        {
            float x;
            float y;
            float z;
            float w;
        };
        __m128 value;
    };
};

// Quaternion const dot(Quaternion const &,Quaternion const &) PROC             ; dot, COMDAT
//         movups  xmm1, XMMWORD PTR [rdx]
//         mov     rax, rcx
//         movups  xmm0, XMMWORD PTR [r8]
//         mulps   xmm1, xmm0
//         movups  XMMWORD PTR [rcx], xmm1
//         ret     0
// Quaternion const dot(Quaternion const &,Quaternion const &) ENDP             ; dot

struct alignas(16) Quaternion
{
    union
    {
        struct
        {
            float x;
            float y;
            float z;
            float w;
        };
        __m128 value;
    };
};

// Quaternion const dot(Quaternion const &,Quaternion const &) PROC             ; dot, COMDAT
//         movups  xmm1, XMMWORD PTR [rdx]
//         mov     rax, rcx
//         movups  xmm0, XMMWORD PTR [r8]
//         mulps   xmm1, xmm0
//         movups  XMMWORD PTR [rcx], xmm1
//         ret     0
// Quaternion const dot(Quaternion const &,Quaternion const &) ENDP             ; dot