Plan 9 from Bell Labs’s /usr/web/sources/contrib/stallion/root/arm/go/src/math/copysign.go

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Distributed under the MIT License.
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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 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)
}

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