DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

#### Mercurial (d38398e5144e)

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
``````
``````/* @(#)e_atanh.c 1.3 95/01/18 */
``````/*
`````` * ====================================================
`````` * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
`````` *
`````` * Developed at SunSoft, a Sun Microsystems, Inc. business.
`````` * Permission to use, copy, modify, and distribute this
`````` * software is freely granted, provided that this notice
`````` * is preserved.
`````` * ====================================================
`````` *
`````` */
``````
``````//#include <sys/cdefs.h>
``````//__FBSDID("\$FreeBSD\$");
``````
``````/* __ieee754_atanh(x)
`````` * Method :
`````` *    1.Reduced x to positive by atanh(-x) = -atanh(x)
`````` *    2.For x>=0.5
`````` *                  1              2x                          x
`````` *	atanh(x) = --- * log(1 + -------) = 0.5 * log1p(2 * --------)
`````` *                  2             1 - x                      1 - x
`````` *
`````` * 	For x<0.5
`````` *	atanh(x) = 0.5*log1p(2x+2x*x/(1-x))
`````` *
`````` * Special cases:
`````` *	atanh(x) is NaN if |x| > 1 with signal;
`````` *	atanh(NaN) is that NaN with no signal;
`````` *	atanh(+-1) is +-INF with signal.
`````` *
`````` */
``````
``````#include <float.h>
``````
``````#include "math_private.h"
``````
``````static const double one = 1.0, huge = 1e300;
``````static const double zero = 0.0;
``````
``````double
``````__ieee754_atanh(double x)
``````{
``````	double t;
``````	int32_t hx,ix;
``````	u_int32_t lx;
``````	EXTRACT_WORDS(hx,lx,x);
``````	ix = hx&0x7fffffff;
``````	if ((ix|((lx|(-lx))>>31))>0x3ff00000) /* |x|>1 */
``````	    return (x-x)/(x-x);
``````	if(ix==0x3ff00000)
``````	    return x/zero;
``````	if(ix<0x3e300000&&(huge+x)>zero) return x;	/* x<2**-28 */
``````	SET_HIGH_WORD(x,ix);
``````	if(ix<0x3fe00000) {		/* x < 0.5 */
``````	    t = x+x;
``````	    t = 0.5*log1p(t+t*x/(one-x));
``````	} else
``````	    t = 0.5*log1p((x+x)/(one-x));
``````	if(hx>=0) return t; else return -t;
``````}
``````