Because it prevents some optimizations, eg. there is one reason for signed overflow UB: https://gist.github.com/rygorous/e0f055bfb74e3d5f0af20690759de5a7 https:

Because it prevents some optimizations, eg. there is one reason for signed overflow UB: https://gist.github.com/rygorous/e0f055bfb74e3d5f0af20690759de5a7 https://gist.github.com/rygorous/e0f055bfb74e3d5f0af20690759...