title: Pushing a xmm register into the stack without affecting flags
body: <p>Moving a xmm register to the stack can be done by</p>
  <pre><code>sub rsp,16
  movdqu  xmmword [rsp], xmm0
  </code></pre>
  <p>Problem here is <code>sub add</code> modify rflags.</p>
  <p>How can I achieve this without use of expensive <code>pushfq popfq</code>?</p>