10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
24 */
25 /*
26 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
27 * Use is subject to license terms.
28 */
29
30 #pragma weak atanhl = __atanhl
31
32 #include "libm.h"
33 #include "libm_synonyms.h"
34
35 #define GENERIC long double
36 #define ATANH atanhl
37
38 /* ATANH(x)
39 * 1 2x x
40 * ATANH(x) = --- * LOG(1 + -------) = 0.5 * LOG1P(2 * --------)
41 * 2 1 - x 1 - x
42 * Note: to guarantee ATANH(-x) = -ATANH(x), we use
43 * sign(x) |x|
44 * ATANH(x) = ------- * LOG1P(2*-------).
45 * 2 1 - |x|
46 *
47 * Special cases:
48 * ATANH(x) is NaN if |x| > 1 with signal;
49 * ATANH(NaN) is that NaN with no signal;
50 * ATANH(+-1) is +-INF with signal.
51 *
52 */
53
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10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
24 */
25 /*
26 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
27 * Use is subject to license terms.
28 */
29
30 #pragma weak __atanhl = atanhl
31
32 #include "libm.h"
33
34 #define GENERIC long double
35 #define ATANH atanhl
36
37 /* ATANH(x)
38 * 1 2x x
39 * ATANH(x) = --- * LOG(1 + -------) = 0.5 * LOG1P(2 * --------)
40 * 2 1 - x 1 - x
41 * Note: to guarantee ATANH(-x) = -ATANH(x), we use
42 * sign(x) |x|
43 * ATANH(x) = ------- * LOG1P(2*-------).
44 * 2 1 - |x|
45 *
46 * Special cases:
47 * ATANH(x) is NaN if |x| > 1 with signal;
48 * ATANH(NaN) is that NaN with no signal;
49 * ATANH(+-1) is +-INF with signal.
50 *
51 */
52
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