On Fri, 22 May 2020 at 06:54, Haoxin Tu via Gcc <gcc@gcc.gnu.org> wrote: > > Hi, there! > > I am new for using GCC mail list, please forgive me if something is wrong.
You're using the wrong mailing list, see https://gcc.gnu.org/lists.html which says this question should be on the gcc-help list. Please send any replies there instead. > I have some issues about how GCC deal with the different optimizations in a > UB program. It's undefined. Anything can happen. We're not going to define the behaviour of undefined behaviour, because it's undefined. https://en.wikipedia.org/wiki/Undefined_behavior https://en.cppreference.com/w/cpp/language/ub
