GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libm/src/s_ccosl.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_ccosl.c,v 1.2 2011/07/20 19:28:33 martynas 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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/*							ccosl()
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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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 * long double complex ccosl();
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 * long double complex z, w;
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 *
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 * w = ccosl( 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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 * 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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 *    DEC       -10,+10      8400       4.5e-17     1.3e-17
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 *    IEEE      -10,+10     30000       3.8e-16     1.0e-16
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 */
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#include <complex.h>
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#include <math.h>
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static void
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cchshl(long double x, long double *c, long double *s)
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{
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	long double e, ei;
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	if(fabsl(x) <= 0.5L) {
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		*c = coshl(x);
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		*s = sinhl(x);
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	} else {
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		e = expl(x);
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		ei = 0.5L/e;
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		e = 0.5L * 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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long double complex
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ccosl(long double complex z)
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{
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	long double complex w;
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	long double ch, sh;
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	cchshl(cimagl(z), &ch, &sh);
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	w = cosl(creall(z)) * ch + (-sinl(creall(z)) * sh) * I;
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	return (w);
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}