https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79240
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- So, either this is a bug in s390_extzv_shift_ok that is should use s390_contiguous_bitmask_p (contig, true, bitsize, &start, &end); instead of s390_contiguous_bitmask_nowrap_p (contig, bitsize, &start, &end); and deal with the start > end case somehow. Or the 4 patterns that use s390_extzv_shift_ok should use contiguous_bitmask_nowrap_operand instead of contiguous_bitmask_operand.
