| /* sf_asinh.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. |
| * ==================================================== |
| */ |
| |
| #include "fdlibm.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< 0x31800000) { /* |x|<2**-28 */ |
| if(huge+x>one) return x; /* return x inexact except 0 */ |
| } |
| if(ix>0x4d800000) { /* |x| > 2**28 */ |
| w = logf(fabsf(x))+ln2; |
| } else if (ix>0x40000000) { /* 2**28 > |x| > 2.0 */ |
| t = fabsf(x); |
| w = logf((float)2.0*t+one/(sqrtf(x*x+one)+t)); |
| } else { /* 2.0 > |x| > 2**-28 */ |
| t = x*x; |
| w =log1pf(fabsf(x)+t/(one+sqrtf(one+t))); |
| } |
| if(hx>0) return w; else return -w; |
| } |
| |
| #ifdef _DOUBLE_IS_32BITS |
| |
| #ifdef __STDC__ |
| double asinh(double x) |
| #else |
| double asinh(x) |
| double x; |
| #endif |
| { |
| return (double) asinhf((float) x); |
| } |
| |
| #endif /* defined(_DOUBLE_IS_32BITS) */ |
