1 /* s_asinhf.c -- float version of s_asinh.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 <sys/cdefs.h> 17 #if defined(LIBM_SCCS) && !defined(lint) 18 __RCSID("$NetBSD: s_asinhf.c,v 1.7 1999/07/02 15:37:42 simonb Exp $"); 19 #endif 20 21 #include "math.h" 22 #include "math_private.h" 23 24 #ifdef __STDC__ 25 static const float 26 #else 27 static float 28 #endif 29 one = 1.0000000000e+00, /* 0x3F800000 */ 30 ln2 = 6.9314718246e-01, /* 0x3f317218 */ 31 huge= 1.0000000000e+30; 32 33 #ifdef __STDC__ 34 float asinhf(float x) 35 #else 36 float asinhf(x) 37 float x; 38 #endif 39 { 40 float t,w; 41 int32_t hx,ix; 42 GET_FLOAT_WORD(hx,x); 43 ix = hx&0x7fffffff; 44 if(ix>=0x7f800000) return x+x; /* x is inf or NaN */ 45 if(ix< 0x31800000) { /* |x|<2**-28 */ 46 if(huge+x>one) return x; /* return x inexact except 0 */ 47 } 48 if(ix>0x4d800000) { /* |x| > 2**28 */ 49 w = __ieee754_logf(fabsf(x))+ln2; 50 } else if (ix>0x40000000) { /* 2**28 > |x| > 2.0 */ 51 t = fabsf(x); 52 w = __ieee754_logf((float)2.0*t+one/(__ieee754_sqrtf(x*x+one)+t)); 53 } else { /* 2.0 > |x| > 2**-28 */ 54 t = x*x; 55 w =log1pf(fabsf(x)+t/(one+__ieee754_sqrtf(one+t))); 56 } 57 if(hx>0) return w; else return -w; 58 } 59