From 527fa149136dffd80f5b36c338b544f09df1fe10 Mon Sep 17 00:00:00 2001
From: peter <peter@FreeBSD.org>
Date: Thu, 19 Aug 1999 00:32:48 +0000
Subject: Try using the builtin ffs() for egcs, it (by random inspection)
 generates slightly better code and avoids the incl then subl when using
 ffs(foo) - 1.

---
 sys/amd64/include/cpufunc.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'sys/amd64')

diff --git a/sys/amd64/include/cpufunc.h b/sys/amd64/include/cpufunc.h
index c5ba2de..60928b8 100644
--- a/sys/amd64/include/cpufunc.h
+++ b/sys/amd64/include/cpufunc.h
@@ -30,7 +30,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: cpufunc.h,v 1.87 1999/05/09 23:30:01 peter Exp $
+ *	$Id: cpufunc.h,v 1.88 1999/07/23 23:45:19 alc Exp $
  */
 
 /*
@@ -84,6 +84,9 @@ enable_intr(void)
 
 #define	HAVE_INLINE_FFS
 
+#if __GNUC__ == 2 && __GNUC_MINOR__ > 8
+#define ffs(mask) __builtin_ffs(mask)
+#else
 static __inline int
 ffs(int mask)
 {
@@ -102,6 +105,7 @@ ffs(int mask)
 			 : "=r" (result) : "0" (mask));
 	return (result);
 }
+#endif
 
 #define	HAVE_INLINE_FLS
 
-- 
cgit v1.1