https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115876
--- Comment #11 from Martin Jambor <jamborm at gcc dot gnu.org> --- Our weekend ubsan bootstrap and test (of revision r15-2173-ge0d997e913f811) still reported failures when compiling testcase gfortran.dg/ieee/large_1.f90 (at -O2 and higher).