From 67ba40d1e05c39ffe71294476d2f2c13c481f3bd Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Thu, 23 Aug 2012 14:38:34 -0400
Subject: [PATCH] optimize legacy ffs function

---
 src/misc/ffs.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/misc/ffs.c b/src/misc/ffs.c
index 2f7cb321..673ce5a9 100644
--- a/src/misc/ffs.c
+++ b/src/misc/ffs.c
@@ -1,9 +1,7 @@
 #include <strings.h>
+#include "atomic.h"
 
 int ffs(int i)
 {
-	unsigned int j = i;
-	for (i=1; j && !(j&1); j>>=1, i++);
-	if (j) return i;
-	return 0;
+	return i ? a_ctz_l(i)+1 : 0;
 }