// Copyright 2010 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

/*
	Hypot -- sqrt(p*p + q*q), but overflows only if the result does.
*/

// Hypot returns Sqrt(p*p + q*q), taking care to avoid
// unnecessary overflow and underflow.
//
// Special cases are:
//	Hypot(±Inf, q) = +Inf
//	Hypot(p, ±Inf) = +Inf
//	Hypot(NaN, q) = NaN
//	Hypot(p, NaN) = NaN
func (,  float64) float64 {
	if haveArchHypot {
		return archHypot(, )
	}
	return hypot(, )
}

func hypot(,  float64) float64 {
	// special cases
	switch {
	case IsInf(, 0) || IsInf(, 0):
		return Inf(1)
	case IsNaN() || IsNaN():
		return NaN()
	}
	,  = Abs(), Abs()
	if  <  {
		,  = , 
	}
	if  == 0 {
		return 0
	}
	 =  / 
	return  * Sqrt(1+*)
}