693 Opensource replacement of sunwlibm

Reviewed by: Igor Kozhukhov ikozhukhov@gmail.com
Reviewed by: Keith M Wesolowski <keith.wesolowski@joyent.com>
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Approved by: Dan McDonald <danmcd@omniti.com>

1 files changed, 57 insertions, 0 deletions

diff --git a/usr/src/lib/libm/common/m9x/ldexp.c b/usr/src/lib/libm/common/m9x/ldexp.c
new file mode 100644
index 0000000000..ac0fcc8dd3
--- /dev/null
+++ b/usr/src/lib/libm/common/m9x/ldexp.c
@@ -0,0 +1,57 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
+ */
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#if defined(ELFOBJ)
+#pragma weak ldexp = __ldexp
+#endif
+
+#include "libm.h"
+#include <errno.h>
+
+double
+ldexp(double x, int n) {
+	int *px = (int *) &x, ix = px[HIWORD] & ~0x80000000;
+
+	if (ix >= 0x7ff00000 || (px[LOWORD] | ix) == 0)
+#if defined(FPADD_TRAPS_INCOMPLETE_ON_NAN)
+		return (ix >= 0x7ff80000 ? x : x + x);
+		/* assumes sparc-like QNaN */
+#else
+		return (x + x);
+#endif
+	x = scalbn(x, n);
+	ix = px[HIWORD] & ~0x80000000;
+	/*
+	 * SVID3 requires both overflow and underflow cases to set errno
+	 * XPG3/XPG4/XPG4.2/SUSv2 requires overflow to set errno
+	 */
+	if (ix >= 0x7ff00000 || (px[LOWORD] | ix) == 0)
+		errno = ERANGE;
+	return (x);
+}