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 of f
8// and the sign of sign.
9func Copysign(f, sign float64) float64 {
10	const signBit = 1 << 63
11	return Float64frombits(Float64bits(f)&^signBit | Float64bits(sign)&signBit)
12}
13