Copyright 2017 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 runtime

import 

var inf = float64frombits(0x7FF0000000000000)
isNaN reports whether f is an IEEE 754 ``not-a-number'' value.
IEEE 754 says that only NaNs satisfy f != f.
	return  != 
}
isFinite reports whether f is neither NaN nor an infinity.
func ( float64) bool {
	return !isNaN( - )
}
isInf reports whether f is an infinity.
func ( float64) bool {
	return !isNaN() && !isFinite()
}
Abs returns the absolute value of x. Special cases are: Abs(±Inf) = +Inf Abs(NaN) = NaN
func ( float64) float64 {
	const  = 1 << 63
	return float64frombits(float64bits() &^ )
}
copysign returns a value with the magnitude of x and the sign of y.
func (,  float64) float64 {
	const  = 1 << 63
	return float64frombits(float64bits()&^ | float64bits()&)
}
Float64bits returns the IEEE 754 binary representation of f.
func ( float64) uint64 {
	return *(*uint64)(unsafe.Pointer(&))
}
Float64frombits returns the floating point number corresponding the IEEE 754 binary representation b.
func ( uint64) float64 {
	return *(*float64)(unsafe.Pointer(&))