mirror of
https://git.planet-casio.com/Lephenixnoir/OpenLibm.git
synced 2025-05-28 14:35:17 +02:00
84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
/*-
|
|
* Copyright (c) 2011 David Schultz
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice unmodified, this list of conditions, and the following
|
|
* disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Hyperbolic tangent of a complex argument z. See s_ctanh.c for details.
|
|
*/
|
|
|
|
#include "cdefs-compat.h"
|
|
//__FBSDID("$FreeBSD: src/lib/msun/src/s_ctanhf.c,v 1.2 2011/10/21 06:30:16 das Exp $");
|
|
|
|
#include <complex.h>
|
|
#include <openlibm.h>
|
|
|
|
#include "math_private.h"
|
|
|
|
float complex
|
|
ctanhf(float complex z)
|
|
{
|
|
float x, y;
|
|
float t, beta, s, rho, denom;
|
|
u_int32_t hx, ix;
|
|
|
|
x = crealf(z);
|
|
y = cimagf(z);
|
|
|
|
GET_FLOAT_WORD(hx, x);
|
|
ix = hx & 0x7fffffff;
|
|
|
|
if (ix >= 0x7f800000) {
|
|
if (ix & 0x7fffff)
|
|
return (cpackf(x, (y == 0 ? y : x * y)));
|
|
SET_FLOAT_WORD(x, hx - 0x40000000);
|
|
return (cpackf(x,
|
|
copysignf(0, isinf(y) ? y : sinf(y) * cosf(y))));
|
|
}
|
|
|
|
if (!isfinite(y))
|
|
return (cpackf(y - y, y - y));
|
|
|
|
if (ix >= 0x41300000) { /* x >= 11 */
|
|
float exp_mx = expf(-fabsf(x));
|
|
return (cpackf(copysignf(1, x),
|
|
4 * sinf(y) * cosf(y) * exp_mx * exp_mx));
|
|
}
|
|
|
|
t = tanf(y);
|
|
beta = 1.0 + t * t;
|
|
s = sinhf(x);
|
|
rho = sqrtf(1 + s * s);
|
|
denom = 1 + beta * s * s;
|
|
return (cpackf((beta * rho * s) / denom, t / denom));
|
|
}
|
|
|
|
float complex
|
|
ctanf(float complex z)
|
|
{
|
|
|
|
z = ctanhf(cpackf(-cimagf(z), crealf(z)));
|
|
return (cpackf(cimagf(z), -crealf(z)));
|
|
}
|
|
|