GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libm/src/s_ctanh.c Lines: 0 2 0.0 %
Date: 2017-11-13 Branches: 0 0 0.0 %

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/*	$OpenBSD: s_ctanh.c,v 1.7 2016/09/12 19:47:02 guenther Exp $	*/
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/*
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 * Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net>
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 *
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 * Permission to use, copy, modify, and distribute this software for any
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 * purpose with or without fee is hereby granted, provided that the above
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 * copyright notice and this permission notice appear in all copies.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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 */
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/*							ctanh
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 *
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 *	Complex hyperbolic tangent
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 *
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 *
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 *
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 * SYNOPSIS:
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 *
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 * double complex ctanh();
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 * double complex z, w;
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 *
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 * w = ctanh (z);
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 *
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 *
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 *
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 * DESCRIPTION:
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 *
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 * tanh z = (sinh 2x  +  i sin 2y) / (cosh 2x + cos 2y) .
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 *
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 * ACCURACY:
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 *
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 *                      Relative error:
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 * arithmetic   domain     # trials      peak         rms
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 *    IEEE      -10,+10     30000       1.7e-14     2.4e-16
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 *
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 */
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#include <complex.h>
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#include <float.h>
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#include <math.h>
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double complex
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ctanh(double complex z)
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{
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	double complex w;
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	double x, y, d;
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	x = creal(z);
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	y = cimag(z);
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	d = cosh (2.0 * x) + cos (2.0 * y);
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	w = sinh (2.0 * x) / d  +  (sin (2.0 * y) / d) * I;
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	return (w);
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}
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DEF_STD(ctanh);
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LDBL_MAYBE_UNUSED_CLONE(ctanh);