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Source file src/math/abs.go

     1	// Copyright 2009 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	package math
     6	
     7	// Abs returns the absolute value of x.
     8	//
     9	// Special cases are:
    10	//	Abs(±Inf) = +Inf
    11	//	Abs(NaN) = NaN
    12	func Abs(x float64) float64 {
    13		// TODO: once golang.org/issue/13095 is fixed, change this to:
    14		// return Float64frombits(Float64bits(x) &^ (1 << 63))
    15		// But for now, this generates better code and can also be inlined:
    16		if x < 0 {
    17			return -x
    18		}
    19		if x == 0 {
    20			return 0 // return correctly abs(-0)
    21		}
    22		return x
    23	}
    24	

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