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