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// 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(x, y) returns a value with the magnitude

// of x and the sign of y.

func Copysign(x, y float64) float64 {

        const sign = 1 << 63

        return Float64frombits(Float64bits(x)&^sign | Float64bits(y)&sign)

}