1 files changed, 79 insertions, 0 deletions
diff --git a/usr/src/lib/libm/common/C/sinh.c b/usr/src/lib/libm/common/C/sinh.c
new file mode 100644
index 0000000000..8c690a7ef2
--- /dev/null
+++ b/usr/src/lib/libm/common/C/sinh.c
@@ -0,0 +1,79 @@
+/*
+ * 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 sinh = __sinh
+
+/* INDENT OFF */
+/*
+ * sinh(x)
+ * Code originated from 4.3bsd.
+ * Modified by K.C. Ng for SUN 4.0 libm.
+ * 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-1024*ln2)*2**1023
+ *
+ *
+ * Special cases:
+ *	sinh(x) is x if x is +INF, -INF, or NaN.
+ *	only sinh(0)=0 is exact for finite argument.
+ *
+ */
+/* INDENT ON */
+
+#include "libm.h"
+
+static const double
+	ln2hi = 6.93147180369123816490e-01,
+	ln2lo = 1.90821492927058770002e-10,
+	lnovft = 7.09782712893383973096e+02;
+
+double
+sinh(double x) {
+	double	ox, r, t;
+
+	ox = x;
+	r = fabs(x);
+	if (!finite(x))
+		return (x * r);
+	if (r < lnovft) {
+		t = expm1(r);
+		r = copysign((t + t / (1.0 + t)) * 0.5, x);
+	} else {
+		if (r < 1000.0)
+			x = copysign(exp((r - 1024 * ln2hi) - 1024 * ln2lo), x);
+		r = scalbn(x, 1023);
+	}
+	if (!finite(r))
+		r = _SVID_libm_err(ox, ox, 25);
+	return (r);
+}