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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libm/] [math/] [sf_asinh.c] - Rev 859
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/* 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(!FLT_UWORD_IS_FINITE(ix)) 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 = __ieee754_logf(fabsf(x))+ln2; } else if (ix>0x40000000) { /* 2**28 > |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**-28 */ t = x*x; w =log1pf(fabsf(x)+t/(one+__ieee754_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) */
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