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Date:   Sat, 21 Nov 2020 21:23:10 +0100
From:   Luc Van Oostenryck <>
To:     Peter Zijlstra <>
Cc:     Andrew Morton <>,
        Linus Torvalds <>,,,
        Jakub Jelinek <>,
Subject: Re: [PATCH] ilog2: Improve ilog2 for constant arguments

On Fri, Nov 20, 2020 at 01:51:54PM +0100, Peter Zijlstra wrote:
> Other option would be to change the const_ilog2 macro, though as the
> description says it is meant to be used also in C constant expressions,
> and while GCC will fold it to constant with constant argument even in
> those, perhaps it is better to avoid using extensions in that case.

Just for info, the description is outdated and Sparse is just fine with
__builtin_clzll() and friends in constant expressions (since Feb 2017)
-- Luc

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