GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libm/src/s_ccosf.c Lines: 0 12 0.0 %
Date: 2017-11-13 Branches: 0 2 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: s_ccosf.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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/*							ccosf()
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 *
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 *	Complex circular cosine
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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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 * void ccosf();
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 * cmplxf z, w;
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 *
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 * ccosf( &z, &w );
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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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 * If
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 *     z = x + iy,
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 *
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 * then
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 *
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 *     w = cos x  cosh y  -  i sin x sinh y.
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 *
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 *
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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       1.8e-7       5.5e-8
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 */
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#include <complex.h>
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#include <math.h>
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/* calculate cosh and sinh */
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static void
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_cchshf(float xx, float *c, float *s)
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{
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	float x, e, ei;
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	x = xx;
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	if(fabsf(x) <= 0.5f) {
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		*c = coshf(x);
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		*s = sinhf(x);
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	}
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	else {
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		e = expf(x);
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		ei = 0.5f/e;
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		e = 0.5f * e;
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		*s = e - ei;
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		*c = e + ei;
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	}
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}
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float complex
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ccosf(float complex z)
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{
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	float complex w;
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	float ch, sh;
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	_cchshf( cimagf(z), &ch, &sh );
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	w = cosf( crealf(z) ) * ch + ( -sinf( crealf(z) ) * sh) * I;
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	return (w);
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}