[PATCH 2/2] eal: add rte ffs32 and rte ffs64 inline functions

[Andre Muezerie]

On Fri, Jun 14, 2024 at 04:49:49PM +0200, David Marchand wrote:
> On Wed, Mar 20, 2024 at 10:25 PM Tyler Retzlaff
> <roretzla at linux.microsoft.com> wrote:
> >
> > provide toolchain abstraction for __builtin_ffs{,l,ll} gcc built-in
> > intrinsics.
> >
> > Signed-off-by: Tyler Retzlaff <roretzla at linux.microsoft.com>
> 
> Please add a unit test and an entry in the release notes.
> 
> > ---
> >  lib/eal/include/rte_bitops.h | 34 ++++++++++++++++++++++++++++++++++
> >  1 file changed, 34 insertions(+)
> >
> > diff --git a/lib/eal/include/rte_bitops.h b/lib/eal/include/rte_bitops.h
> > index 449565e..e157a45 100644
> > --- a/lib/eal/include/rte_bitops.h
> > +++ b/lib/eal/include/rte_bitops.h
> > @@ -405,6 +405,28 @@
> >         return (unsigned int)__popcnt64(v);
> >  }
> >
> > +static inline unsigned int
> > +rte_ffs32(uint32_t v)
> > +{
> > +       unsigned long rv;
> > +
> > +       if (0 == _BitScanForward(&rv, v))
> 
> _BitScanForward(&rv, v) == 0 please.
> 
> 
> -- 
> David Marchand
> 

Thanks David. I'll make the change suggested and add some unit tests.
--
Andre Muezerie