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Source file src/math/frexp.go

Documentation: math

  // Copyright 2009 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
  
  // Frexp breaks f into a normalized fraction
  // and an integral power of two.
  // It returns frac and exp satisfying f == frac × 2**exp,
  // with the absolute value of frac in the interval [½, 1).
  //
  // Special cases are:
  //	Frexp(±0) = ±0, 0
  //	Frexp(±Inf) = ±Inf, 0
  //	Frexp(NaN) = NaN, 0
  func Frexp(f float64) (frac float64, exp int)
  
  func frexp(f float64) (frac float64, exp int) {
  	// special cases
  	switch {
  	case f == 0:
  		return f, 0 // correctly return -0
  	case IsInf(f, 0) || IsNaN(f):
  		return f, 0
  	}
  	f, exp = normalize(f)
  	x := Float64bits(f)
  	exp += int((x>>shift)&mask) - bias + 1
  	x &^= mask << shift
  	x |= (-1 + bias) << shift
  	frac = Float64frombits(x)
  	return
  }
  

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