http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53265
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-03-11 15:49:00 UTC --- Created attachment 29637 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29637 gcc48-pr53265.patch Untested patch. Not sure about the warning wording, plus no idea how to call the warning option (-Wnum-loop-iterations, -Wundefined-behavior-in-loop, something else?), whether to enable it by default, or just for -Wall. A bigger issue is that I see multiple warnings for the same stmts, despite the guard in loop structure, because apparently the same loop is represented by different loop structures during the optimizations.
