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.
7 // Copysign(x, y) returns a value with the magnitude
8 // of x and the sign of y.
9 func Copysign(x
, y
float64) float64 {
11 return Float64frombits(Float64bits(x
)&^sign |
Float64bits(y
)&sign
)