https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112661
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Sandiford from comment #8)
> I think we're going down the wrong path here. If I've understood
> the original change correctly, dummy masks aren't special because
> they're masks. They're special because all elements are equal to
> the same value. A mask such as:
>
> { 1, 1, 1, 0, 1 }
>
> would not be OK, just like an integer vector with those values would
> not be OK.
>
> So IMO we should check whether all elements are equal, rather than
> whether the type is one thing or another.
So do we expect - independed of whether a constant/external is used as mask -
that uniform constants/externals are generatable and thus we can elide the
check for those? Possibly also go a different path during code-generation
then? (because that will otherwise assert)
