--- Comment #1 from Allan Jensen <linux at carewolf dot com> ---
Note it might be hard to figure out for the compiler that the result for a==255
will leave the input unchanged, but you can observe the same if you instead
test for a == 0 (and return 0). In that case the compiler should have enough
math deduction to be able to tell that the result of a==0 is always 0.

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