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

Line Branch Exec Source
1
/* e_atanhf.c -- float version of e_atanh.c.
2
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3
 */
4
5
/*
6
 * ====================================================
7
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8
 *
9
 * Developed at SunPro, a Sun Microsystems, Inc. business.
10
 * Permission to use, copy, modify, and distribute this
11
 * software is freely granted, provided that this notice
12
 * is preserved.
13
 * ====================================================
14
 */
15
16
#include "math.h"
17
#include "math_private.h"
18
19
static const float one = 1.0, huge = 1e30;
20
static const float zero = 0.0;
21
22
float
23
atanhf(float x)
24
{
25
	float t;
26
	int32_t hx,ix;
27
	GET_FLOAT_WORD(hx,x);
28
	ix = hx&0x7fffffff;
29
	if (ix>0x3f800000) 		/* |x|>1 */
30
	    return (x-x)/(x-x);
31
	if(ix==0x3f800000)
32
	    return x/zero;
33
	if(ix<0x31800000&&(huge+x)>zero) return x;	/* x<2**-28 */
34
	SET_FLOAT_WORD(x,ix);
35
	if(ix<0x3f000000) {		/* x < 0.5 */
36
	    t = x+x;
37
	    t = (float)0.5*log1pf(t+t*x/(one-x));
38
	} else
39
	    t = (float)0.5*log1pf((x+x)/(one-x));
40
	if(hx>=0) return t; else return -t;
41
}