[Bug target/111645] Intrinsics vec_sldb /vec_srdb fail with __vector unsigned __int128

["munroesj at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111645

--- Comment #3 from Steven Munroe <munroesj at gcc dot gnu.org> ---
(In reply to Peter Bergner from comment #1)
> I see that we have created built-in overloads for signed and unsigned vector
> char through vector long long.  That said, the rs6000-builtins.def only
> seems to support the signed vector types though, which is why you're seeing
> an error.  So confirmed.
> 
> That said, I believe your 3rd argument needs to be a real constant integer,
> since the vsldbi instruction requires that.  It doesn't allow for a const
> int variable.  I notice some older (not trunk) gcc versions are ICEing with
> that, so another bug to look at.
The original code is static inline, so the const int parm should transfer
intact to the builtin const.

It seems I over-simplified the deduced test case.
> 
> I do not see any documentation that says we support the vector __int128
> type.  Where exactly did you see that?  However, from the instruction
> description, it seems like the hw instruction could support that.

I stand corrected. The documentation only describes vector unsigned long long.
But the instruction is like vsldoi and does not really care what the type is.