[Bug middle-end/113988] during GIMPLE pass: bitintlower: internal compiler error: in lower_stmt, at gimple-lower-bitint.cc:5470

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113988

--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #9)
> (In reply to Richard Biener from comment #8)
> > (In reply to Jakub Jelinek from comment #7)
> > > I think I can handle it like the VIEW_CONVERT_EXPR case, bet with
> > > _BitInt(511) it would actually be a VCE, but when it is same size
> > > BITINT_TYPE to INTEGER_TYPE we choose NOP_EXPR.
> > > That said, I think it would be better if the memcpy folding used say vector
> > > types instead of these extra large integer types.
> > 
> > Hmm.  Maybe we want a target hook to specify the "move mode" for a given
> > byte size and then we can use bitwise_type_for_mode to get a type?
> > 
> > Maybe we can even get rid of that large integer mode requirement that way ...
> 
> Or we refuse to use integer types for > MAX_FIXED_MODE_SIZE sizes and
> instead always try VNQImode?  For memcpy folding I mean.

Yeah, and punt if that mode isn't supported.