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[/] [or1k/] [trunk/] [newlib/] [newlib/] [libm/] [math/] [ef_acosh.c] - Blame information for rev 1765

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1 39 lampret
/* ef_acosh.c -- float version of e_acosh.c.
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 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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 */
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/*
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 * ====================================================
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 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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 *
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 * Developed at SunPro, a Sun Microsystems, Inc. business.
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 * Permission to use, copy, modify, and distribute this
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 * software is freely granted, provided that this notice
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 * is preserved.
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 * ====================================================
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 *
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 */
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#include "fdlibm.h"
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#ifdef __STDC__
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static const float
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#else
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static float
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#endif
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one     = 1.0,
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ln2     = 6.9314718246e-01;  /* 0x3f317218 */
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#ifdef __STDC__
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        float __ieee754_acoshf(float x)
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#else
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        float __ieee754_acoshf(x)
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        float x;
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#endif
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{
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        float t;
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        __int32_t hx;
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        GET_FLOAT_WORD(hx,x);
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        if(hx<0x3f800000) {             /* x < 1 */
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            return (x-x)/(x-x);
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        } else if(hx >=0x4d800000) {    /* x > 2**28 */
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            if(hx >=0x7f800000) {       /* x is inf of NaN */
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                return x+x;
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            } else
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                return __ieee754_logf(x)+ln2;   /* acosh(huge)=log(2x) */
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        } else if (hx==0x3f800000) {
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            return 0.0;                 /* acosh(1) = 0 */
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        } else if (hx > 0x40000000) {   /* 2**28 > x > 2 */
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            t=x*x;
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            return __ieee754_logf((float)2.0*x-one/(x+__ieee754_sqrtf(t-one)));
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        } else {                        /* 1<x<2 */
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            t = x-one;
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            return log1pf(t+__ieee754_sqrtf((float)2.0*t+t*t));
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        }
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}

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