------- Comment #2 from daven at model dot com 2009-10-30 22:28 ------- Subject: Re: gcc bug when comparing x to -x (linux, 32-bit)
Thanks for your quick response. I would like to point out that on every compiler and machine I've used, the behavior of signed overflow may not be defined -- but it's always been consistent. Perhaps the inline optimizations that are taking place could be made to at least function the same way as the non-inlined case? (Or am I going to get no-bugged on this bugz?) --David rguenth at gcc dot gnu dot org wrote: > ------- Comment #1 from rguenth at gcc dot gnu dot org 2009-10-30 22:23 > ------- > signed overflow invokes undefined behavior. You can use -fwrapv to make it > wrapping. Or you can use unsigned types for the comparison, like > > if ((unsigned)x != -(unsigned)x) > > > -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41882
