[Bug target/68211] Free __m128d subreg of double

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68211

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Marc Glisse from comment #2)
> (In reply to H.J. Lu from comment #1)
> > When the patch for PR 70708, I got
> > 
> > 	vmovq	%xmm0, %xmm0
> > 	vsqrtsd	{ru-sae}, %xmm0, %xmm0, %xmm0
> > 	ret
> 
> Note that the goal of both PRs is to get rid of that movq (I agree that movq
> looks like an improvement compared to what we have currently, thanks).

It depends on how the upper bits should be treated.