Re: [PATCH] Add "is_power_of_2" checking to log2.h. | KernelTrap

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

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From: Valdis.Kletnieks

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

Date: Thursday, February 1, 2007 - 1:17 pm

On Thu, 01 Feb 2007 13:39:15 +0100, Tim Schmielau said:
quoted text> #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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Messages in current thread:

[PATCH] Add "is_power_of_2" checking to log2.h., Robert P. J. Day, (Tue Jan 30, 4:06 am)

Re: [PATCH] Add "is_power_of_2" checking to log2.h., Nick Piggin, (Tue Jan 30, 5:25 am)

Re: [PATCH] Add "is_power_of_2" checking to log2.h., Robert P. J. Day, (Tue Jan 30, 5:56 am)

Re: [PATCH] Add "is_power_of_2" checking to log2.h., Jan Engelhardt, (Tue Jan 30, 7:12 am)

Re: [PATCH] Add "is_power_of_2" checking to log2.h., Robert P. J. Day, (Tue Jan 30, 7:45 am)

Re: [PATCH] Add "is_power_of_2" checking to log2.h., Jan Engelhardt, (Tue Jan 30, 8:50 am)

Re: [PATCH] Add "is_power_of_2" checking to log2.h., Robert P. J. Day, (Tue Jan 30, 9:00 am)

Re: [PATCH] Add "is_power_of_2" checking to log2.h., Nick Piggin, (Tue Jan 30, 6:21 pm)

Re: [PATCH] Add "is_power_of_2" checking to log2.h., Robert P. J. Day, (Wed Jan 31, 12:20 am)

Re: [PATCH] Add "is_power_of_2" checking to log2.h., Vegard Nossum, (Wed Jan 31, 3:13 am)

Re: [PATCH] Add "is_power_of_2" checking to log2.h., Robert P. J. Day, (Wed Jan 31, 3:47 am)

Re: [PATCH] Add "is_power_of_2" checking to log2.h. , David Howells, (Thu Feb 1, 3:41 am)

Re: [PATCH] Add "is_power_of_2" checking to log2.h. , David Howells, (Thu Feb 1, 3:43 am)

Re: [PATCH] Add "is_power_of_2" checking to log2.h., Robert P. J. Day, (Thu Feb 1, 3:49 am)

Re: [PATCH] Add "is_power_of_2" checking to log2.h. , Tim Schmielau, (Thu Feb 1, 5:39 am)

Re: [PATCH] Add "is_power_of_2" checking to log2.h., Valdis.Kletnieks, (Thu Feb 1, 1:17 pm)

Re: [PATCH] Add "is_power_of_2" checking to log2.h., Tim Schmielau, (Thu Feb 1, 2:55 pm)

Re: [PATCH] Add "is_power_of_2" checking to log2.h., Mariusz Kozlowski, (Tue Feb 20, 8:29 am)

Re: [PATCH] Add "is_power_of_2" checking to log2.h., Kumar Gala, (Tue Feb 20, 8:56 am)

Re: [PATCH] Add "is_power_of_2" checking to log2.h., Mariusz Kozlowski, (Tue Feb 20, 9:14 am)

Re: [PATCH] Add "is_power_of_2" checking to log2.h., H. Peter Anvin, (Mon Jun 11, 4:11 pm)

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