On Thu, 1 Feb 2007, [EMAIL PROTECTED] wrote:
> 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?
Yeah, I can't count. Make that
#define is_power_of_2_or_zero(x) ((x & (x-1))==0)
#define is_power_of_4(x) (is_power_of_2_or_zero(x) \
&& (x & ((typeof(x))0x5555555555555555ull)))
of course.
Thanks,
Tim
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
