Re: [PATCH] ilog2: Improve ilog2 for constant arguments

[Luc Van Oostenryck]

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Just for info, the description is outdated and Sparse is just fine with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