Marcin Mirosław <marcin@xxxxxxxx> writes: > W dniu 2011-06-16 18:30, Ian Lance Taylor pisze: >> When a program crashes, it is normally a bug in the program, not a bug >> in the compiler. You should report this to libtommath. Only report a >> bug against gcc if you are convinced that the compiler is mishandling >> valid code. > > Hi, > thanks for the reply! I have to admit i'm still don't sure. Problem > described earlier appears only with optimalization "-O2 > -fgraphite-identity", with e.g. "-O1 -fgraphite-identity" or "-O0 > -fgraphite-identity" i don't have such problem. So i've suspected > problem with gcc. Many programs crash at -O2 but not at -O1. That is because -O2 implements more aggressive optimizations. It does not mean that the compiler is wrong. Often the program will work if you use -fno-strict-aliasing -fno-strict-overflow along with -O2. If so, it still does not indicate a compiler bug; it indicates a program bug. Ian
