Re: [Xen-devel] ffs vs __builtin_ffs

[Tim Deegan <tim@xxxxxxx>]

At 10:53 +0000 on 31 Oct (1383213226), Andrew Cooper wrote:
> Would it be acceptable to provide a patch which does a straight replace
> of the static inline function with a define?  __builtin_ffs is supported
> in all compilers we support, but there does not appear to any sane way
> to detect the presence of the builtin.

Seems like a good idea to me, though it'd have to be __builtin_ffsl()
as the existing ffs() takes an unsigned long.

Tim.

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