copysign.mx raw

   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 of f
   8  // and the sign of sign.
   9  func Copysign(f, sign float64) float64 {
  10  	const signBit = 1 << 63
  11  	return Float64frombits(Float64bits(f)&^signBit | Float64bits(sign)&signBit)
  12  }
  13