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-rw-r--r--contrib/timer-wheel/find_last_bit.c17
1 files changed, 12 insertions, 5 deletions
diff --git a/contrib/timer-wheel/find_last_bit.c b/contrib/timer-wheel/find_last_bit.c
index 054e90a076f..0479c52f904 100644
--- a/contrib/timer-wheel/find_last_bit.c
+++ b/contrib/timer-wheel/find_last_bit.c
@@ -15,15 +15,22 @@
*/
/**
- * @find_last_bit
- * optimized implementation of find last bit in
+ * @find_first_bit
+ * optimized implementation of find first bit in
*/
#ifndef BITS_PER_LONG
+#ifdef __LP64__
#define BITS_PER_LONG 64
+#else
+#define BITS_PER_LONG 32
+#endif
#endif
-static inline int fls(int x)
+#if defined(__GNUC__) || defined(__clang__)
+#define ffs(p) __builtin_ffs(p)
+#else
+static inline int ffs(int x)
{
int r = 32;
@@ -51,7 +58,7 @@ static inline int fls(int x)
}
return r;
}
-
+#endif
unsigned long gf_tw_find_last_bit(const unsigned long *addr, unsigned long size)
{
@@ -73,7 +80,7 @@ unsigned long gf_tw_find_last_bit(const unsigned long *addr, unsigned long size)
tmp = addr[--words];
if (tmp) {
found:
- return words * BITS_PER_LONG + fls(tmp);
+ return words * BITS_PER_LONG + ffs(tmp);
}
}