https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110941
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- GCC 13: Global Exported: _6 = [irange] unsigned int [0, 24] NONZERO 0x1e trunk: Global Exported: _6 = [irange] unsigned int [0, 24][+INF, +INF] MASK 0x1c VALUE 0x0 And then: Folding predicate _6 > 24 to 0 does not happen. But what is interesting is with https://gcc.gnu.org/pipermail/gcc-patches/2023-September/629128.html , We get: ``` Simplified relational if (_6 > 24) into if (_6 == 4294967295) Folded into: if (_6 == 4294967295) ``` And then during cfgcleanup the match pattern: /* X == C (or X & Z == Y | C) is impossible if ~nonzero(X) & C != 0. */ Hits which is totally funny because that means the range and nonzero information are out of sync ...
