[Bug c++/50115] Integer test optimised away at -O2 by the VRP

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50115

--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-08-18 
13:11:45 UTC ---
correct

you can tell gcc to wrap on signed overflow with -fwrapv