http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50082
--- Comment #6 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-08-16 09:10:12 UTC --- (In reply to comment #5) > "rguenth at gcc dot gnu.org" <gcc-bugzi...@gcc.gnu.org> writes: > > > I suppose the forwprop code wants to force a warning at -Wstrict-overflow=1 > > if the conditional becomes optimized to a constant at compile-time? > > Yes. But perhaps it is overly aggressive--are these conditionals being > optimized to a constant? Maybe the condition for the first argument to > fold_undefer_overflow_warnings needs to be fixed. In this case not. forwprop doesn't do anything more fancy than calling fold, so fold should already handle optimizing to a constant specially, no? So I guess the first argument to fold_undefer_overflow_warnings should be zero? I'll be posting a patch and CC you.
