2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2011 David Schultz
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 * Hyperbolic tangent of a complex argument z. See s_ctanh.c for details.
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
39 #include "math_private.h"
42 ctanhf(float complex z)
45 float t, beta, s, rho, denom;
51 GET_FLOAT_WORD(hx, x);
54 if (ix >= 0x7f800000) {
56 return (CMPLXF(nan_mix(x, y),
57 y == 0 ? y : nan_mix(x, y)));
58 SET_FLOAT_WORD(x, hx - 0x40000000);
60 copysignf(0, isinf(y) ? y : sinf(y) * cosf(y))));
64 return (CMPLXF(y - y, y - y));
66 if (ix >= 0x41300000) { /* |x| >= 11 */
67 float exp_mx = expf(-fabsf(x));
68 return (CMPLXF(copysignf(1, x),
69 4 * sinf(y) * cosf(y) * exp_mx * exp_mx));
75 rho = sqrtf(1 + s * s);
76 denom = 1 + beta * s * s;
77 return (CMPLXF((beta * rho * s) / denom, t / denom));
81 ctanf(float complex z)
84 z = ctanhf(CMPLXF(cimagf(z), crealf(z)));
85 return (CMPLXF(cimagf(z), crealf(z)));