switch re, im := real(x), imag(x); {
	case math.IsInf(re, 0):
		switch {
		case re > 0 && im == 0:
			return x
		case math.IsInf(im, 0) || math.IsNaN(im):
			if re < 0 {
				return complex(0, math.Copysign(0, im))
			} else {
				return complex(math.Inf(1.0), math.NaN())
			}
		}
	case math.IsNaN(re):
		if im == 0 {
			return complex(math.NaN(), im)
		}
	}
	r := math.Exp(real(x))

	if imag(x) == 0 {
		// Ensure that imag(r) has the same sign as imag(x) for imag(x) == signed zero.
		if real(x) == 0 {
			return complex(0, imag(x))
		}
		if real(x) < 0 {
			return complex(0, math.Copysign(math.Sqrt(-real(x)), imag(x)))
		}
		return complex(math.Sqrt(real(x)), imag(x))
	} else if math.IsInf(imag(x), 0) {
		return complex(math.Inf(1.0), imag(x))
	}
	if real(x) == 0 {
		if imag(x) < 0 {

	fmt.Printf("%.2f", math.Atan2(0, 0))
	// Output: 0.00
}

func ExampleAtanh() {
	fmt.Printf("%.2f", math.Atanh(0))
	// Output: 0.00
}

func ExampleCopysign() {
	fmt.Printf("%.2f", math.Copysign(3.2, -1))
	// Output: -3.20
}

func ExampleCos() {
	fmt.Printf("%.2f", math.Cos(math.Pi/2))
	// Output: 0.00
}

func ExampleCosh() {
	fmt.Printf("%.2f", math.Cosh(0))
	// Output: 1.00
}

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

package cmp_test

import (
	"cmp"
	"fmt"
	"math"
	"slices"
	"sort"
	"strings"
	"testing"
	"unsafe"
)

var negzero = math.Copysign(0, -1)
var nonnilptr uintptr = uintptr(unsafe.Pointer(&negzero))
var nilptr uintptr = uintptr(unsafe.Pointer(nil))

var tests = []struct {
	x, y    any
	compare int
}{
	{1, 2, -1},
	{1, 1, 0},

		{4.459, 'f', 3, "4.459"},
		{5.459, 'f', 4, "5.4590"},

		{0, 'b', 0, "0"},
		{math.Copysign(0, -1), 'b', 0, "-0"},
		{1.0, 'b', 0, "4503599627370496p-52"},
		{-1.0, 'b', 0, "-4503599627370496p-52"},
		{4503599627370496, 'b', 0, "4503599627370496p+0"},

		{0, 'p', 0, "0"},
		{math.Copysign(0, -1), 'p', 0, "-0"},
		{1024.0, 'p', 0, "0x.8p+11"},
		{-1024.0, 'p', 0, "-0x.8p+11"},

		{float32(1.0) / float32(256), " 0.00390625 ", false},
		{float32(0), " 0 ", false},
		{math.Copysign(0, -1), " -0 ", false},
		{float64(1.0), " 1 ", false},
		{float64(-1.0), " -1 ", false},
		{float64(0.5), " 0.5 ", false},
		{float64(-0.5), " -0.5 ", false},
		{float64(0), " 0 ", false},
		{math.Copysign(0, -1), " -0 ", false},
		{"", `""`, false},
		{"foo", `"foo"`, false},
		// Newlines.

	m := make(map[float64]bool, 0)

	m[+0.0] = true
	m[math.Copysign(0.0, -1.0)] = true // should overwrite +0 entry

	if len(m) != 1 {
		t.Error("length wrong")
	}

	for k := range m {
		if math.Copysign(1.0, k) > 0 {
			t.Error("wrong sign")
		}
	}

	m = make(map[float64]bool, 0)
	m[math.Copysign(0.0, -1.0)] = true
	m[+0.0] = true // should overwrite -0.0 entry

	if len(m) != 1 {

		{name: "F32Abs", asm: "F32Abs", argLength: 1, reg: fp32_11, typ: "Float32"},           // abs(arg0)
		{name: "F32Copysign", asm: "F32Copysign", argLength: 2, reg: fp32_21, typ: "Float32"}, // copysign(arg0, arg1)

		{name: "F64Sqrt", asm: "F64Sqrt", argLength: 1, reg: fp64_11, typ: "Float64"},         // sqrt(arg0)
		{name: "F64Trunc", asm: "F64Trunc", argLength: 1, reg: fp64_11, typ: "Float64"},       // trunc(arg0)

		if i2 != i1 {
			t.Fatalf("unmarshaled %v, want %v:\n%s", i2, i1, buf)
		}
	}
}

func FuzzFloat64RoundTrip(f *testing.F) {
	f.Add(math.Float64bits(0))
	f.Add(math.Float64bits(math.Copysign(0, -1)))
	f.Add(math.Float64bits(math.MaxFloat64))
	f.Add(math.Float64bits(math.SmallestNonzeroFloat64))
	f.Add(math.Float64bits(math.NaN()))
	f.Add(uint64(0x7FF0000000000001)) // signaling NaN

	MOVD	$PosInf, R3
	CMPUBEQ	R3, R1, posInfPosInf

	//special case Atan2(-Inf, +Inf) = -Pi/4
	MOVD	$NegInf, R3
	CMPUBEQ	R3, R1, negInfPosInf

	//special case Atan2(x, +Inf) = Copysign(0, x)
	CMPBLT	R1, $0, returnNegZero
	BR returnPosZero

Normal:
	FMOVD	x+0(FP), F0
	FMOVD	y+8(FP), F2
	MOVD	$·atan2rodataL25<>+0(SB), R9
	LGDR	F0, R2
	LGDR	F2, R1
	RISBGNZ	$32, $63, $32, R2, R2