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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package math

// The original C code, the long comment, and the constants
// below are from FreeBSD's /usr/src/lib/msun/src/s_asinh.c
// and came with this notice.  The go code is a simplified
// version of the original C.
//
// ====================================================
// 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)))
//

// Asinh(x) calculates the inverse hyperbolic sine of x.
//
// Special cases are:
//      Asinh(±0) = ±0
//      Asinh(±Inf) = ±Inf
//      Asinh(NaN) = NaN
func Asinh(x float64) float64 {
        const (
                Ln2      = 6.93147180559945286227e-01 // 0x3FE62E42FEFA39EF
                NearZero = 1.0 / (1 << 28)            // 2**-28
                Large    = 1 << 28                    // 2**28
        )
        // special cases
        if IsNaN(x) || IsInf(x, 0) {
                return x
        }
        sign := false
        if x < 0 {
                x = -x
                sign = true
        }
        var temp float64
        switch {
        case x > Large:
                temp = Log(x) + Ln2 // |x| > 2**28
        case x > 2:
                temp = Log(2*x + 1/(Sqrt(x*x+1)+x)) // 2**28 > |x| > 2.0
        case x < NearZero:
                temp = x // |x| < 2**-28
        default:
                temp = Log1p(x + x*x/(1+Sqrt(1+x*x))) // 2.0 > |x| > 2**-28
        }
        if sign {
                temp = -temp
        }
        return temp
}