libgo/go/math/unsafe.go

   1 // Copyright 2009 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 import "unsafe"
   8
   9 // Float32bits returns the IEEE 754 binary representation of f,
  10 // with the sign bit of f and the result in the same bit position.
  11 // Float32bits(Float32frombits(x)) == x.
  12 func Float32bits(f float32) uint32 { return *(*uint32)(unsafe.Pointer(&f)) }
  13
  14 // Float32frombits returns the floating-point number corresponding
  15 // to the IEEE 754 binary representation b, with the sign bit of b
  16 // and the result in the same bit position.
  17 // Float32frombits(Float32bits(x)) == x.
  18 func Float32frombits(b uint32) float32 { return *(*float32)(unsafe.Pointer(&b)) }
  19
  20 // Float64bits returns the IEEE 754 binary representation of f,
  21 // with the sign bit of f and the result in the same bit position,
  22 // and Float64bits(Float64frombits(x)) == x.
  23 func Float64bits(f float64) uint64 { return *(*uint64)(unsafe.Pointer(&f)) }
  24
  25 // Float64frombits returns the floating-point number corresponding
  26 // to the IEEE 754 binary representation b, with the sign bit of b
  27 // and the result in the same bit position.
  28 // Float64frombits(Float64bits(x)) == x.
  29 func Float64frombits(b uint64) float64 { return *(*float64)(unsafe.Pointer(&b)) }