1 files changed, 86 insertions, 0 deletions
diff --git a/usr/src/lib/libm/common/R/__cosf.c b/usr/src/lib/libm/common/R/__cosf.c
new file mode 100644
index 0000000000..c17cc00b7f
--- /dev/null
+++ b/usr/src/lib/libm/common/R/__cosf.c
@@ -0,0 +1,86 @@
+/*
+ * 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_cos(double x);
+ * kernel (float) cos 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.
+ *
+ * Method: Let z = x * x, then
+ *	C(x) = (C0 + C1*z + C2*z*z) * (C3 + C4*z + z*z)
+ * where
+ *	C0 =   1.09349482127188401868272000389539985058873853699e-0003
+ *	C1 =  -5.03324285989964979398034700054920226866107675091e-0004
+ *	C2 =   2.43792880266971107750418061559602239831538067410e-0005
+ *	C3 =   9.14499072605666582228127405245558035523741471271e+0002
+ *	C4 =  -3.63151270591815439197122504991683846785293207730e+0001
+ *
+ * The remez error is bound by  |cos(x) - C(x)| < 2**(-34.2)
+ *
+ * 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.
+ */
+/* INDENT ON */
+
+static const double q[] = {
+/* C0 = */   1.09349482127188401868272000389539985058873853699e-0003,
+/* C1 = */  -5.03324285989964979398034700054920226866107675091e-0004,
+/* C2 = */   2.43792880266971107750418061559602239831538067410e-0005,
+/* C3 = */   9.14499072605666582228127405245558035523741471271e+0002,
+/* C4 = */  -3.63151270591815439197122504991683846785293207730e+0001,
+};
+
+#define	C0	q[0]
+#define	C1	q[1]
+#define	C2	q[2]
+#define	C3	q[3]
+#define	C4	q[4]
+
+float
+__k_cosf(double x) {
+	float ft;
+	double z;
+	int hx;
+
+	hx = ((int *) &x)[HIWORD];	/* hx = leading x  */
+	if ((hx & ~0x80000000) < 0x3f100000) {	/* |x| < 2**-14 */
+		ft = (float) 1;
+		if (((int) x) == 0)	/* raise inexact if x != 0 */
+			return (ft);
+	}
+	z = x * x;
+	ft = (float) (((C0 + z * C1) + (z * z) * C2) * (C3 + z * (C4 + z)));
+	return (ft);
+}