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, 88 insertions, 0 deletions

diff --git a/usr/src/lib/libm/common/LD/sinhl.c b/usr/src/lib/libm/common/LD/sinhl.c
new file mode 100644
index 0000000000..242a22908a
--- /dev/null
+++ b/usr/src/lib/libm/common/LD/sinhl.c
@@ -0,0 +1,88 @@
+/*
+ * 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.
+ */
+
+#pragma weak sinhl = __sinhl
+
+#include "libm.h"
+#include "longdouble.h"
+
+/* SINH(X)
+ * RETURN THE HYPERBOLIC SINE OF X
+ *
+ * Method :
+ *	1. reduce x to non-negative by SINH(-x) = - SINH(x).
+ *	2. 
+ *
+ *	                                      EXPM1(x) + EXPM1(x)/(EXPM1(x)+1)
+ *	    0 <= x <= lnovft     : SINH(x) := --------------------------------
+ *			       		                      2
+ *
+ *     lnovft <= x <  INF	 : SINH(x) := EXP(x-MEP1*ln2)*2**ME
+ *	
+ * here
+ *	lnovft		logarithm of the overflow threshold
+ *			= MEP1*ln2 chopped to machine precision.
+ *	ME		maximum exponent
+ *	MEP1		maximum exponent plus 1
+ *
+ * Special cases:
+ *	SINH(x) is x if x is +INF, -INF, or NaN.
+ *	only SINH(0)=0 is exact for finite argument.
+ *
+ */
+
+static const long double C[] = {
+	0.5L,
+	1.0L,
+	1.135652340629414394879149e+04L,
+	7.004447686242549087858985e-16L
+};
+
+#define	half	C[0]
+#define	one	C[1]
+#define	lnovft	C[2]
+#define	lnovlo	C[3]
+
+long double
+sinhl(long double x)
+{
+	long double	r, t;
+
+	if (!finitel(x))
+		return (x + x);	/* x is INF or NaN */
+	r = fabsl(x);
+	if (r < lnovft) {
+		t = expm1l(r);
+		r = copysignl((t + t / (one + t)) * half, x);
+	} else {
+		r = copysignl(expl((r - lnovft) - lnovlo), x);
+		r = scalbnl(r, 16383);
+	}
+	return (r);
+}