https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62263
--- Comment #1 from M.E. O'Neill <oneill+gccbugs at cs dot hmc.edu> --- Possibly this should have been filed as a tree-level bug? Also, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=17886 which mostly is about issues with wider types, but may also cover this bug.