The fact that signed overflow is undefined is unfortunately something that is necessary for certain optimizations to be valid. You can, for example, try `-fwrap

The fact that signed overflow is undefined is unfortunately something that is necessary for certain optimizations to be valid. You can, for example, try `-fwrapv` or `-ftrapv` on GCC, but if you run through an extensive benchmark suite you’ll see regressions. Not everyone cares about the benchmarks, but enough do.