libgo/go/math/copysign.go

   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(x, y) 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 }