https://gcc.gnu.org/bugzilla/show_bug.cgi?id=73550
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> --- The diagnostic is gone in GCC 12+ and re-appears with adding -fno-thread-jumps because: MAX_NUM_CHAINS exceeded: 8 and the logic is extra stupid in building 8 chains but no more but then when building predicates rejecting exactly the case of 8 chains ...