import std;

​

void main()

{

    simdbytes a = 2;

    writeln(a);

    complement32(&a , cast(simdbytes*)&b); // A should contain 0xFD/253 if it had 2.

    writeln(a);

}

alias simdbytes = ubyte[32];

static const simdbytes b  = 0b1111_1111;

void complement32(simdbytes* a, simdbytes* b) { //i don't know how to get addr of "b", sorry

    asm{

        mov RAX, a[RBP];

        mov RBX, b[RBP];

        test RBX,RBX;//test if pointer to B is null

        jz end;

        movaps YMM0, [RAX];//prepare register

        movaps YMM1, [RBX];

        xorps YMM0, [RBX];

        movaps [RAX] , YMM0;//xmm version crashes with LDC but works just fine with DMD, why?

        end:;

    }

}

​