https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127100
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> --- riscv for which r14-1932 was done only uses 0 bias, so it is just s390 that uses bias -1. So I wonder if it just wasn't a documentation mistake in r14-1932 which then lead to wrong change in r16-5984.
