eal: add rte ffs32 and rte ffs64 inline functions

provide toolchain abstraction for __builtin_ffs{,l,ll} gcc built-in
intrinsics.

Signed-off-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
Signed-off-by: 0-day Robot <robot@bytheb.org>

lib/eal/include/rte_bitops.h

@@ -405,6 +405,28 @@ rte_popcount64(uint64_t v)
 	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 @@ rte_popcount64(uint64_t v)
 	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
 
 /**