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| author | peter <peter@FreeBSD.org> | 1999-08-19 00:32:48 +0000 |
|---|---|---|
| committer | peter <peter@FreeBSD.org> | 1999-08-19 00:32:48 +0000 |
| commit | 527fa149136dffd80f5b36c338b544f09df1fe10 (patch) | |
| tree | b51fa89367f347193af59cfecbac0060ad038afb /sys/amd64 | |
| parent | fc24e28a1e340db2942e9ea61467cd0f63a6071f (diff) | |
| download | FreeBSD-src-527fa149136dffd80f5b36c338b544f09df1fe10.zip FreeBSD-src-527fa149136dffd80f5b36c338b544f09df1fe10.tar.gz | |
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.
Diffstat (limited to 'sys/amd64')
| -rw-r--r-- | sys/amd64/include/cpufunc.h | 6 |
1 files changed, 5 insertions, 1 deletions
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 |
