Push XMM register to the stack

Question

Is there a way of pushing a packed doubleword integer from XMM register to the stack? and then later on pop it back when needed?

Ideally I am looking for something

Answer 1

I’d recommend to use a separate, 16-bit aligned stack for this purpose, so you can use movdqa instead of movdqu. There is a slight difference in execution time between these 2 instructions!

Answer 2

No, there is no such a asm instruction under x86, but you can do something like:

//Push xmm0
sub     esp, 16
movdqu  dqword [esp], xmm0

//Pop xmm0
movdqu  xmm0, dqword [esp]
add     esp, 16

EDIT:

Upper code sample is direct push/pop emulation.

In case that you are using on stack also other local variables, than the ebp register must be at first properly set, like:

push ebp
mov  ebp, esp
sub  esp, LocaStackVariablesSize
//... your code
mov  esp, ebp
pop  ebp  
ret

In that case you can also use Daniels solution!