I mean, there is even no reason to emit a single instruction. However it would be helpful for the unconditional UB to turn to a trap (in fact, UB is particularl

I mean, there is even no reason to emit a single instruction. However it would be helpful for the unconditional UB to turn to a trap (in fact, UB is particularly bad because some of them won't have a visible effect for a long time). Given clang and LLVM does emit ud2 for traps from UB, I think this could also have become ud2 but it somehow didn't.