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-rw-r--r--src/math/s_asinh.c53
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diff --git a/src/math/s_asinh.c b/src/math/s_asinh.c
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-/* @(#)s_asinh.c 5.1 93/09/24 */
-/*
- * ====================================================
- * 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.
- * ====================================================
- */
-
-/* asinh(x)
- * Method :
- * Based on
- * asinh(x) = sign(x) * log [ |x| + sqrt(x*x+1) ]
- * we have
- * asinh(x) := x if 1+x*x=1,
- * := sign(x)*(log(x)+ln2)) for large |x|, else
- * := sign(x)*log(2|x|+1/(|x|+sqrt(x*x+1))) if|x|>2, else
- * := sign(x)*log1p(|x| + x^2/(1 + sqrt(1+x^2)))
- */
-
-#include <math.h>
-#include "math_private.h"
-
-static const double
-one = 1.00000000000000000000e+00, /* 0x3FF00000, 0x00000000 */
-ln2 = 6.93147180559945286227e-01, /* 0x3FE62E42, 0xFEFA39EF */
-huge= 1.00000000000000000000e+300;
-
-double
-asinh(double x)
-{
- double t,w;
- int32_t hx,ix;
- GET_HIGH_WORD(hx,x);
- ix = hx&0x7fffffff;
- if(ix>=0x7ff00000) return x+x; /* x is inf or NaN */
- if(ix< 0x3e300000) { /* |x|<2**-28 */
- if(huge+x>one) return x; /* return x inexact except 0 */
- }
- if(ix>0x41b00000) { /* |x| > 2**28 */
- w = log(fabs(x))+ln2;
- } else if (ix>0x40000000) { /* 2**28 > |x| > 2.0 */
- t = fabs(x);
- w = log(2.0*t+one/(sqrt(x*x+one)+t));
- } else { /* 2.0 > |x| > 2**-28 */
- t = x*x;
- w =log1p(fabs(x)+t/(one+sqrt(one+t)));
- }
- if(hx>0) return w; else return -w;
-}