>> The problem isn't that the math is going to be changed so that the wraparound doesn't occur, but that the compiler is (eventually) going to do a larger scale

>> The problem isn't that the math is going to be changed so that the wraparound doesn't occur, but that the compiler is (eventually) going to do a larger scale optimization that silently removes your check to see whether a wrap around has occurred. I don't need to check for wrap around, that's the entire reason for using that particular scaling for an angle measure. Same for calculating signed changes in angle diff = a - b just works.