[Bug c/105923] unsupported return type ‘complex double’ for simd

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105923

--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Hongtao.liu from comment #6)
> > .L3:
> >         subl    %r13d, %r12d
> >         cmpl    $1, %r12d
> >         je      .L6
> >         salq    $4, %r13
> >         vmovapd a(%r13), %xmm0
> >         call    _ZGVbN2v_foo
> >         vmovapd %xmm0, b(%r13)
> 
> hmm,  xmm version should be abandoned since it's just 1 complex double.

If there is an XMM version of a vector complex, will it be faster than
passing complex double as a struct in 2 registers.