https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79731
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> --- Ugh, the BIT_FIELD_REF is built by fold_truth_andor... (elsewhere we avoid creating those). We fold (BIT_FIELD_REF <x, 64, 0> & 18446744073709551615) != 0 || VIEW_CONVERT_EXPR<unsigned int[2]>(x)[2] != 0 Probably best avoided in decode_field_reference by returning NULL_TREE for out-of-bound accesses.
