clear sign bit, instead of comparing to zero and setting x=-x.

fixes special cases, such as neg. zero, and makes C99 conformant
ok miod@, millert@
since there's nothing else in arm's fabs.c, replace 4-clause license
w/ the one at /usr/share/misc/license.template

2 files changed, 34 insertions, 41 deletions

diff --git a/lib/libc/arch/arm/gen/fabs.c b/lib/libc/arch/arm/gen/fabs.c
index 0ff790d29e4..aa1d8e07362 100644
--- a/lib/libc/arch/arm/gen/fabs.c
+++ b/lib/libc/arch/arm/gen/fabs.c
@@ -1,45 +1,32 @@
-/*	$OpenBSD: fabs.c,v 1.2 2004/02/01 05:40:52 drahn Exp $	*/
-/*	$NetBSD: fabs.c,v 1.2 2002/05/26 11:48:01 wiz Exp $	*/
-
+/*	$OpenBSD: fabs.c,v 1.3 2008/07/23 18:11:13 martynas Exp $	*/
 /*
- * Copyright (c) 1996 Mark Brinicombe
+ * Copyright (c) 2008 Martynas Venckus <martynas@openbsd.org>
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *	This product includes software developed by Mark Brinicombe
- * 4. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
  *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#include <sys/types.h>
+#include <machine/ieee.h>
+
 /*
- * fabs(x) returns the absolute value of x.
+ * fabs(d) returns the absolute value of d.
  */
-
 double
-fabs(double x)
+fabs(double d)
 {
-	if (x < 0)
-		x = -x;
-	return(x);
+	struct ieee_double *p = (struct ieee_double *)&d;
+
+	p->dbl_sign = 0;
+
+	return(d);
 }
diff --git a/lib/libc/arch/sh/gen/fabs.c b/lib/libc/arch/sh/gen/fabs.c
index 116e8b4139a..cadfc0e03ed 100644
--- a/lib/libc/arch/sh/gen/fabs.c
+++ b/lib/libc/arch/sh/gen/fabs.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: fabs.c,v 1.3 2007/03/02 06:11:54 miod Exp $	*/
+/*	$OpenBSD: fabs.c,v 1.4 2008/07/23 18:11:14 martynas Exp $	*/
 /*
  * Copyright (c) 2006 Miodrag Vallat.
  *
@@ -16,16 +16,22 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#if !defined(__SH4__) || defined(__SH4_NOFPU__)
+#include <sys/types.h>
+#include <machine/ieee.h>
+#endif /* !defined(__SH4__) || defined(__SH4_NOFPU__) */
+
 #include <math.h>
 
 double
-fabs(double x)
+fabs(double d)
 {
 #if defined(__SH4__) && !defined(__SH4_NOFPU__)
-	__asm__ __volatile__("fabs %0" : "=f"(x));
+	__asm__ __volatile__("fabs %0" : "=f"(d));
 #else
-	if (x < 0)
-		x = -x;
+	struct ieee_double *p = (struct ieee_double *)&d;
+
+	p->dbl_sign = 0;
 #endif
-	return (x);
+	return (d);
 }