// Copyright 2010 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 // Copysign returns a value with the magnitude of f // and the sign of sign. func Copysign(f, sign float64) float64 { const signBit = 1 << 63 return Float64frombits(Float64bits(f)&^signBit | Float64bits(sign)&signBit) }