https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117006
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> --- So if anything, one would need to decide this on something larger rather than small testcases, say build the whole gcc with -Os + once again with the revision reverted (or SPEC or firefox or something large) and compare overall sizes if something is generally a win or not.