mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-14 17:11:06 +00:00
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/* s_asinhf.c -- float version of s_asinh.c.
|
|
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
|
|
*/
|
|
|
|
/*
|
|
* ====================================================
|
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
|
*
|
|
* Developed at SunPro, a Sun Microsystems, Inc. business.
|
|
* Permission to use, copy, modify, and distribute this
|
|
* software is freely granted, provided that this notice
|
|
* is preserved.
|
|
* ====================================================
|
|
*/
|
|
|
|
#if defined(LIBM_SCCS) && !defined(lint)
|
|
static char rcsid[] = "$NetBSD: s_asinhf.c,v 1.5 1995/05/12 04:57:39 jtc Exp $";
|
|
#endif
|
|
|
|
#include "math.h"
|
|
#include "math_private.h"
|
|
|
|
#ifdef __STDC__
|
|
static const float
|
|
#else
|
|
static float
|
|
#endif
|
|
one = 1.0000000000e+00, /* 0x3F800000 */
|
|
ln2 = 6.9314718246e-01, /* 0x3f317218 */
|
|
huge= 1.0000000000e+30;
|
|
|
|
#ifdef __STDC__
|
|
float __asinhf(float x)
|
|
#else
|
|
float __asinhf(x)
|
|
float x;
|
|
#endif
|
|
{
|
|
float t,w;
|
|
int32_t hx,ix;
|
|
GET_FLOAT_WORD(hx,x);
|
|
ix = hx&0x7fffffff;
|
|
if(ix>=0x7f800000) return x+x; /* x is inf or NaN */
|
|
if(ix< 0x38000000) { /* |x|<2**-14 */
|
|
if(huge+x>one) return x; /* return x inexact except 0 */
|
|
}
|
|
if(ix>0x47000000) { /* |x| > 2**14 */
|
|
w = __ieee754_logf(fabsf(x))+ln2;
|
|
} else if (ix>0x40000000) { /* 2**14 > |x| > 2.0 */
|
|
t = fabsf(x);
|
|
w = __ieee754_logf((float)2.0*t+one/(__ieee754_sqrtf(x*x+one)+t));
|
|
} else { /* 2.0 > |x| > 2**-14 */
|
|
t = x*x;
|
|
w =__log1pf(fabsf(x)+t/(one+__ieee754_sqrtf(one+t)));
|
|
}
|
|
if(hx>0) return w; else return -w;
|
|
}
|
|
weak_alias (__asinhf, asinhf)
|