[Bug c++/49039] [4.6/4.7 Regression] LLVM StringRef miscompilation with -O2

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49039

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-05-18 
11:56:45 UTC ---
-O -ftree-vrp is broken, -O works.  VRP1 performs quite some jump threading.