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// Copyright 2009 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

// Abs returns the absolute value of x.
//
// Special cases are:
//      Abs(±Inf) = +Inf
//      Abs(NaN) = NaN

//extern fabs
func libc_fabs(float64) float64

func Abs(x float64) float64 {
        return libc_fabs(x)
}

func abs(x float64) float64 {
        switch {
        case x < 0:
                return -x
        case x == 0:
                return 0 // return correctly abs(-0)
        }
        return x
}