__declspec(naked)

void* __stdcall __memcpy (

    __in void* Dest,            // ebp+0x08

    __in const void* Src,       // ebp+0x0C

    __in unsigned int Count     // ebp+0x10

    )

{

    __asm {

        push ebp

        mov ebp, esp

        push edi

        push esi

        mov edi, Dest           // edi = Dest

        mov esi, Src            // esi = Src

        mov ecx, Count          // ecx = Count

        mov eax, esi            // eax = Src;

        add eax, ecx            // eax = eax + ecx == Src + Count;

        mov edx, [eax-]        // edx = [eax-4] == *(int32*)(Src + Count - 4)

        mov eax, edi            // eax = Dest;

        add eax, ecx            // eax = eax + ecx == Dest + Count;

        mov [eax-], edx        // [eax-4] == *(int32*)(Dest + Count - 4)

                                //        = edx == *(int32*)(Src + Count - 4);

        shr ecx,               // ecx = ecx >> 2 == Count >> 2;

        rep movsd

        mov eax, Dest

        pop esi

        pop edi

        pop ebp

        retn 0x0C

    };

}