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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libm/src/s_ccos.c	Lines:	0	11	0.0 %
Date:	2017-11-07	Branches:	0	2	0.0 %


/*	$OpenBSD: s_ccos.c,v 1.7 2016/09/12 19:47:02 guenther Exp $	*/
/*
 * Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*							ccos()
 *
 *	Complex circular cosine
 *
 *
 *
 * SYNOPSIS:
 *
 * double complex ccos();
 * double complex z, w;
 *
 * w = ccos (z);
 *
 *
 *
 * DESCRIPTION:
 *
 * If
 *     z = x + iy,
 *
 * then
 *
 *     w = cos x  cosh y  -  i sin x sinh y.
 *
 *
 *
 * ACCURACY:
 *
 *                      Relative error:
 * arithmetic   domain     # trials      peak         rms
 *    DEC       -10,+10      8400       4.5e-17     1.3e-17
 *    IEEE      -10,+10     30000       3.8e-16     1.0e-16
 */

#include <complex.h>
#include <float.h>
#include <math.h>

/* calculate cosh and sinh */

static void
_cchsh(double x, double *c, double *s)
{
	double e, ei;

	if (fabs(x) <= 0.5) {
		*c = cosh(x);
		*s = sinh(x);
	}
	else {
		e = exp(x);
		ei = 0.5/e;
		e = 0.5 * e;
		*s = e - ei;
		*c = e + ei;
	}
}

double complex
ccos(double complex z)
{
	double complex w;
	double ch, sh;

	_cchsh( cimag(z), &ch, &sh );
	w = cos(creal (z)) * ch - (sin (creal (z)) * sh) * I;
	return (w);
}
DEF_STD(ccos);
LDBL_MAYBE_UNUSED_CLONE(ccos);


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: s_ccos.c,v 1.7 2016/09/12 19:47:02 guenther Exp $ */
2			/*
3			* Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net>
4			*
5			* Permission to use, copy, modify, and distribute this software for any
6			* purpose with or without fee is hereby granted, provided that the above
7			* copyright notice and this permission notice appear in all copies.
8			*
9			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14			* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15			* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16			*/
17
18			/* ccos()
19			*
20			* Complex circular cosine
21			*
22			*
23			*
24			* SYNOPSIS:
25			*
26			* double complex ccos();
27			* double complex z, w;
28			*
29			* w = ccos (z);
30			*
31			*
32			*
33			* DESCRIPTION:
34			*
35			* If
36			* z = x + iy,
37			*
38			* then
39			*
40			* w = cos x cosh y - i sin x sinh y.
41			*
42			*
43			*
44			* ACCURACY:
45			*
46			* Relative error:
47			* arithmetic domain # trials peak rms
48			* DEC -10,+10 8400 4.5e-17 1.3e-17
49			* IEEE -10,+10 30000 3.8e-16 1.0e-16
50			*/
51
52			#include <complex.h>
53			#include <float.h>
54			#include <math.h>
55
56			/* calculate cosh and sinh */
57
58			static void
59			_cchsh(double x, double c, double s)
60			{
61			double e, ei;
62
63			if (fabs(x) <= 0.5) {
64			*c = cosh(x);
65			*s = sinh(x);
66			}
67			else {
68			e = exp(x);
69			ei = 0.5/e;
70			e = 0.5 * e;
71			*s = e - ei;
72			*c = e + ei;
73			}
74			}
75
76			double complex
77			ccos(double complex z)
78			{
79			double complex w;
80			double ch, sh;
81
82			_cchsh( cimag(z), &ch, &sh );
83			w = cos(creal (z)) * ch - (sin (creal (z)) * sh) * I;
84			return (w);
85			}
86			DEF_STD(ccos);
87			LDBL_MAYBE_UNUSED_CLONE(ccos);