[2/2] eal: add rte ffs32 and rte ffs64 inline functions
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Commit Message
provide toolchain abstraction for __builtin_ffs{,l,ll} gcc built-in
intrinsics.
Signed-off-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
---
lib/eal/include/rte_bitops.h | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
Comments
On Wed, Mar 20, 2024 at 10:25 PM Tyler Retzlaff
<roretzla@linux.microsoft.com> wrote:
>
> provide toolchain abstraction for __builtin_ffs{,l,ll} gcc built-in
> intrinsics.
>
> Signed-off-by: Tyler Retzlaff <roretzla@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.
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@linux.microsoft.com> wrote:
> >
> > provide toolchain abstraction for __builtin_ffs{,l,ll} gcc built-in
> > intrinsics.
> >
> > Signed-off-by: Tyler Retzlaff <roretzla@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
@@ -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))
+ return 0;
+
+ return (unsigned int)rv + 1;
+}
+
+static inline unsigned int
+rte_ffs64(uint64_t v)
+{
+ unsigned long rv;
+
+ if (0 == _BitScanForward64(&rv, v))
+ return 0;
+
+ return (unsigned int)rv + 1;
+}
+
#else
/**
@@ -491,6 +513,18 @@
return (unsigned int)__builtin_popcountll(v);
}
+static inline unsigned int
+rte_ffs32(uint32_t v)
+{
+ return (unsigned int)__builtin_ffs(v);
+}
+
+static inline unsigned int
+rte_ffs64(uint64_t v)
+{
+ return (unsigned int)__builtin_ffsll(v);
+}
+
#endif
/**