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

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To: Tim Schmielau <[email protected]>
Subject: Re: [PATCH] Add "is_power_of_2" checking to log2.h.
From: [email protected]
Date: Thu, 01 Feb 2007 15:17:11 -0500
Cc: David Howells <[email protected]>, "Robert P. J. Day" <[email protected]>, Linux kernel mailing list <[email protected]>, Andrew Morton <[email protected]>, Paul Mackerras <[email protected]>, [email protected]
In-reply-to: Your message of "Thu, 01 Feb 2007 13:39:15 +0100." <[email protected]>
References: <Pine.LNX.4.64.0701300543420.17991@CPE00045a9c397f-CM001225dbafb6> <[email protected]> <[email protected]>
Sender: [email protected]

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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Follow-Ups:
- Re: [PATCH] Add "is_power_of_2" checking to log2.h.
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References:
- [PATCH] Add "is_power_of_2" checking to log2.h.
  - From: "Robert P. J. Day" <[email protected]>
- Re: [PATCH] Add "is_power_of_2" checking to log2.h.
  - From: David Howells <[email protected]>
- Re: [PATCH] Add "is_power_of_2" checking to log2.h.
  - From: Tim Schmielau <[email protected]>

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