[ajross]

These optimizations are very useful. Consider the only slightly less contrived case where you want to mod an index by the size of an array. And the compiler expands the inline function around a context where the array is a fixed power of two size at compile time. Poof, no division/modulus needed, magically. Lots and lots of code looks like this: general algorithms expressed in simple implementation that has a faster implementation in the specific instance that gets generated.