From bb41d37104bc1cf78e60b0f735d29fcd903895ef Mon Sep 17 00:00:00 2001
From: Peter Wemm <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 +++++-
 sys/i386/include/cpufunc.h  | 6 +++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/sys/amd64/include/cpufunc.h b/sys/amd64/include/cpufunc.h
index c5ba2de5de53..60928b844a71 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
 
diff --git a/sys/i386/include/cpufunc.h b/sys/i386/include/cpufunc.h
index c5ba2de5de53..60928b844a71 100644
--- a/sys/i386/include/cpufunc.h
+++ b/sys/i386/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
 
-- 
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