X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/disorder/blobdiff_plain/52b88d2428a808d0636a1cb8205a1f891fc23e6a..d77d85a66a090304db2359fef1ad7de1707121b4:/lib/bits.h

diff --git a/lib/bits.h b/lib/bits.h
index 856db68..0965cb6 100644
--- a/lib/bits.h
+++ b/lib/bits.h
@@ -25,7 +25,15 @@
 #ifndef BITS_H
 #define BITS_H
 
+#include <string.h>                     /* for fls() */
+
+#if HAVE_FLS
+static inline int leftmost_bit(uint32_t n) {
+  return fls(n) - 1;
+}
+#else
 int leftmost_bit(uint32_t n);
+#endif
 
 #endif /* BITS_H */