// license that can be found in the LICENSE file.

#include "textflag.h"

#define PosInf 0x7FF0000000000000
#define NaN 0x7FF8000000000001

// func archHypot(p, q float64) float64
TEXT ·archHypot(SB),NOSPLIT,$0
	// test bits for special cases
	MOVQ    p+0(FP), BX
	MOVQ    $~(1<<63), AX
	ANDQ    AX, BX // p = |p|
	MOVQ    q+8(FP), CX
	ANDQ    AX, CX // q = |q|
	MOVQ    $PosInf, AX

// 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.

#include "textflag.h"

// func archHypot(p, q float64) float64
TEXT ·archHypot(SB),NOSPLIT,$0
// test bits for not-finite
	MOVL    p_hi+4(FP), AX   // high word p
	ANDL    $0x7ff00000, AX
	CMPL    AX, $0x7ff00000
	JEQ     not_finite
	MOVL    q_hi+12(FP), AX   // high word q

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build 386 || amd64

package math

const haveArchHypot = true

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build !386 && !amd64

package math

const haveArchHypot = false

func archHypot(p, q float64) float64 {
	panic("not implemented")

//
// Special cases are:
//
//	Hypot(±Inf, q) = +Inf
//	Hypot(p, ±Inf) = +Inf
//	Hypot(NaN, q) = NaN
//	Hypot(p, NaN) = NaN
func Hypot(p, q float64) float64 {
	if haveArchHypot {
		return archHypot(p, q)
	}
	return hypot(p, q)
}

func hypot(p, q float64) float64 {
	p, q = Abs(p), Abs(q)
	// special cases
	switch {
	case IsInf(p, 1) || IsInf(q, 1):
		return Inf(1)
	case IsNaN(p) || IsNaN(q):