On Thu, 01 Feb 2007 13:39:15 +0100, Tim Schmielau said:
> #define is_power_of_4(x) (is_power_of_2_or_zero(x) \
>                           && (x & ((typeof(x))0x55555555)))

Those 5's are going to need more magic if x is a 64-bit typeof?

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