> > Does -ftrapv ever take advantage of trapping instructions where the > > hardware has them available? > > Yes, for example Alpha.
OK, but it's the only example. :-) > > Does anyone make substantial use of -ftrapv in production > > There are rarely bug reports about it; for example pointer difference > with odd sized objects was broken for years, and reported only twice > or so. -ftrapv is simply not usable as of today because the performance degradation is abysmal. Plus it is broken in very simple cases (PR middle-end/19020). -- Eric Botcazou
