https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109045
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Thiago Macieira from comment #2) > GCC doesn't print anything and doesn't take the assumption into account, but > Clang prints: > > warning: assumption is ignored because it contains (potential) side-effects > [-Wassume] > 8 | [[assume(!r || *r > 0)]]; > | ~~~~~~~~~^~~~~~~~~~~~~~~ I do think this could be done to: [[assume(!r)]]; [[assume(*r > 0)]]; So at least part of the assume could be useful and then maybe ipa sra/cp could do something.