asm {
mov  R8 , 1 | 2<<32;
movq XMM3, R8;       // 1,2
cvtdq2ps XMM2, XMM3; // 1.0, 2.0
cmpps    XMM2, XMM0, 0;

// How do I branch now?
L1:
...
L2:
...
}