1// Copyright 2010 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
5package math
6
7// Copysign returns a value with the magnitude
8// of x and the sign of y.
9func Copysign(x, y float64) float64 {
10	const sign = 1 << 63
11	return Float64frombits(Float64bits(x)&^sign | Float64bits(y)&sign)
12}
13