1 files changed, 96 insertions, 0 deletions
diff --git a/usr/src/lib/libm/common/R/__tanf.c b/usr/src/lib/libm/common/R/__tanf.c
new file mode 100644
index 0000000000..e42ec914e0
--- /dev/null
+++ b/usr/src/lib/libm/common/R/__tanf.c
@@ -0,0 +1,96 @@
+/*
+ * 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.
+ */
+
+#include "libm.h"
+
+/* INDENT OFF */
+/*
+ * float __k_tan(double x);
+ * kernel (float) tan function on [-pi/4, pi/4], pi/4 ~ 0.785398164
+ * Input x is in double and assumed to be bounded by ~pi/4 in magnitude.
+ *
+ * Constants:
+ * The hexadecimal values are the intended ones for the following constants.
+ * The decimal values may be used, provided that the compiler will convert
+ * from decimal to binary accurately enough to produce the hexadecimal values
+ * shown.
+ */
+
+static const double q[] = {
+/* one */ 1.0,
+/* P0 */  4.46066928428959230679140546271810308098793029785e-0003,
+/* P1 */  4.92165316309189027066395283327437937259674072266e+0000,
+/* P2 */ -7.11410648161473480044492134766187518835067749023e-0001,
+/* P3 */  4.08549808374053391446523164631798863410949707031e+0000,
+/* P4 */  2.50411070398050927821032018982805311679840087891e+0000,
+/* P5 */  1.11492064560251158411574579076841473579406738281e+0001,
+/* P6 */ -1.50565540968422650891511693771462887525558471680e+0000,
+/* P7 */ -1.81484378878349295050043110677506774663925170898e+0000,
+/* T0 */  3.333335997532835641297409611782510896641e-0001,
+/* T1 */  2.999997598248363761541668282006867229939e+00,
+};
+/* INDENT ON */
+
+#define	one q[0]
+#define	P0 q[1]
+#define	P1 q[2]
+#define	P2 q[3]
+#define	P3 q[4]
+#define	P4 q[5]
+#define	P5 q[6]
+#define	P6 q[7]
+#define	P7 q[8]
+#define	T0 q[9]
+#define	T1 q[10]
+
+float
+__k_tanf(double x, int n) {
+	float ft = 0.0;
+	double z, w;
+	int ix;
+
+	ix = ((int *) &x)[HIWORD] & ~0x80000000;	/* ix = leading |x| */
+	/* small argument */
+	if (ix < 0x3f800000) {		/* if |x| < 0.0078125 = 2**-7 */
+		if (ix < 0x3f100000) {	/* if |x| < 2**-14 */
+			if ((int) x == 0) {	/* raise inexact if x != 0 */
+				ft = n == 0 ? (float) x : (float) (-one / x);
+			}
+			return (ft);
+		}
+		z = (x * T0) * (T1 + x * x);
+		ft = n == 0 ? (float) z : (float) (-one / z);
+		return (ft);
+	}
+	z = x * x;
+	w = ((P0 * x) * (P1 + z * (P2 + z)) * (P3 + z * (P4 + z)))
+		* (P5 + z * (P6 + z * (P7 + z)));
+	ft = n == 0 ? (float) w : (float) (-one / w);
+	return (ft);
+}