GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libm/src/e_acoshf.c Lines: 0 14 0.0 %
Date: 2017-11-13 Branches: 0 10 0.0 %

Line Branch Exec Source
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/* e_acoshf.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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#include "math.h"
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#include "math_private.h"
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static const float
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one	= 1.0,
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ln2	= 6.9314718246e-01;  /* 0x3f317218 */
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float
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acoshf(float x)
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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 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 logf((float)2.0*x-one/(x+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+sqrtf((float)2.0*t+t*t));
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	}
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}