blob: 924ee7cc9735b8f2786643df84006295eee7bc92 [file] [log] [blame]
// 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
func Abs(x float64) float64 {
// TODO: once golang.org/issue/13095 is fixed, change this to:
// return Float64frombits(Float64bits(x) &^ (1 << 63))
// But for now, this generates better code and can also be inlined:
if x < 0 {
return -x
}
if x == 0 {
return 0 // return correctly abs(-0)
}
return x
}