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, 60 insertions, 0 deletions

diff --git a/usr/src/lib/libm/common/R/scalbf.c b/usr/src/lib/libm/common/R/scalbf.c
new file mode 100644
index 0000000000..589eac0931
--- /dev/null
+++ b/usr/src/lib/libm/common/R/scalbf.c
@@ -0,0 +1,60 @@
+/*
+ * 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 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma weak scalbf = __scalbf
+
+#include "libm.h"
+
+float
+scalbf(float x, float y) {
+	int	ix, iy, hx, hy, n;
+
+	ix = *(int *)&x;
+	iy = *(int *)&y;
+	hx = ix & ~0x80000000;
+	hy = iy & ~0x80000000;
+
+	if (hx > 0x7f800000 || hy >= 0x7f800000) {
+		/* x is nan or y is inf or nan */
+		return ((iy < 0)? x / -y : x * y);
+	}
+
+	/* see if y is an integer without raising inexact */
+	if (hy >= 0x4b000000) {
+		/* |y| >= 2^23, so it must be an integer */
+		n = (iy < 0)? -65000 : 65000;
+	} else if (hy < 0x3f800000) {
+		/* |y| < 1, so it must be zero or non-integer */
+		return ((hy == 0)? x : (x - x) / (x - x));
+	} else {
+		if (hy & ((1 << (0x96 - (hy >> 23))) - 1))
+			return ((y - y) / (y - y));
+		n = (int)y;
+	}
+	return (scalbnf(x, n));
+}