GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libm/src/s_ctanhf.c Lines: 0 5 0.0 %
Date: 2017-11-13 Branches: 0 0 0.0 %

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/*	$OpenBSD: s_ctanhf.c,v 1.2 2010/07/18 18:42:26 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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/*							ctanhf
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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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 * float complex ctanhf();
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 * float complex z, w;
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 *
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 * w = ctanhf (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 <math.h>
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float complex
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ctanhf(float complex z)
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{
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	float complex w;
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	float x, y, d;
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	x = crealf(z);
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	y = cimagf(z);
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	d = coshf (2.0f * x) + cosf (2.0f * y);
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	w = sinhf (2.0f * x) / d  +  (sinf (2.0f * y) / d) * I;
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	return (w);
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}