https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113988
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> --- (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.
