https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109499
--- Comment #4 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> --- (In reply to rguent...@suse.de from comment #3) > AVX512 masking allows merge and zero modes, zero being cheaper > (obviously). I think "zero" is what all targets support so we could > define GIMPLE to be that way - inactive lanes become zero. That's > then also less of a "partial definition" and "undefined" should be > avoided at best? Thanks, sounds good to me. If direct support for merging turns out to be useful in future, maybe we could add the value of inactive lanes as an extra parameter at that point. Would be quite an invasive change, but it would just be work.
