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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libm/] [math/] [ef_acosh.c] - Rev 193
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/* ef_acosh.c -- float version of e_acosh.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 = 1.0, ln2 = 6.9314718246e-01; /* 0x3f317218 */ #ifdef __STDC__ float __ieee754_acoshf(float x) #else float __ieee754_acoshf(x) float x; #endif { float t; __int32_t hx; GET_FLOAT_WORD(hx,x); if(hx<0x3f800000) { /* x < 1 */ return (x-x)/(x-x); } else if(hx >=0x4d800000) { /* x > 2**28 */ if(!FLT_UWORD_IS_FINITE(hx)) { /* x is inf of NaN */ return x+x; } else return __ieee754_logf(x)+ln2; /* acosh(huge)=log(2x) */ } else if (hx==0x3f800000) { return 0.0; /* acosh(1) = 0 */ } else if (hx > 0x40000000) { /* 2**28 > x > 2 */ t=x*x; return __ieee754_logf((float)2.0*x-one/(x+__ieee754_sqrtf(t-one))); } else { /* 1<x<2 */ t = x-one; return log1pf(t+__ieee754_sqrtf((float)2.0*t+t*t)); } }
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