signbit.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  // Signbit reports whether x is negative or negative zero.
   8  func Signbit(x float64) bool {
   9  	return Float64bits(x)&(1<<63) != 0
  10  }
  11