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SubjectRe: [PATCH] Add "is_power_of_2" checking to log2.h.

Robert P. J. Day <> wrote:

> +#define is_power_of_4(x) is_power_of_2(x) && (ffs(x) & 1))

If this is such a commonly implemented op, it should probably be implemented
globally too.

I also wonder if there's some better way of implementing it than this, but I
can't think of one offhand.

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