optimize legacy ffs function

diff --git a/src/misc/ffs.c b/src/misc/ffs.c
index 2f7cb32..673ce5a 100644 (file)
--- a/src/misc/ffs.c
+++ b/src/misc/ffs.c
@@ -1,9 +1,7 @@
 #include <strings.h>
 #include <strings.h>

+#include "atomic.h"

 
 int ffs(int i)
 {
 
 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;

 }
 }