I'm still on Linus' side: https://gcc.gnu.org/ml/gcc/2016-02/msg00381.html https://gcc.gnu.org/ml/gcc/2016-02/msg00381.html "The fact is, undefined compiler b

I'm still on Linus' side: https://gcc.gnu.org/ml/gcc/2016-02/msg00381.html https://gcc.gnu.org/ml/gcc/2016-02/msg00381.html "The fact is, undefined compiler behavior is never a good idea. Not for serious projects. Performance doesn't come from occasional small and odd micro-optimizations. I care about performance a lot, and I actually look at generated code and do profiling etc. None of those three options have ever shown up as issues. But the incorrect code they generate? It has."