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.