},
		{
			name:          "int64 max positive value",
			in:            hex("1b7fffffffffffffff"), // 9223372036854775807
			want:          int64(9223372036854775807),
			assertOnError: assertNilError,
		},
		{
			name: "max positive integer value supported by cbor: 2^64 - 1",
			in:   hex("1bffffffffffffffff"), // 18446744073709551615

		q = (int64(0x7fffffffffffffff) - int64(i) - (q & 1)) / -int64(i)
	}
	Output = int(q)
}

func BenchmarkDiv64NegDividend(b *testing.B) {
	q := int64(-1)
	for i := 1; i <= b.N; i++ {
		q = -(int64(0x7fffffffffffffff) - int64(i) - (q & 1)) / int64(i)
	}
	Output = int(q)
}

func BenchmarkDiv64NegBoth(b *testing.B) {
	q := int64(-1)
	for i := 1; i <= b.N; i++ {

// Issue 27143: cmd/compile: erroneous application of walkinrange
// optimization for const over 2**63

package p

var c uint64

var b1 bool = 0x7fffffffffffffff < c && c < 0x8000000000000000
var b2 bool = c < 0x8000000000000000 && 0x7fffffffffffffff < c
var b3 bool = 0x8000000000000000 < c && c < 0x8000000000000001

var ures uint64

func TestFloatTruncation(t *testing.T) {
	testdata := []struct {
		input      float64
		convInt64  int64
		convUInt64 uint64
		overflow   bool
	}{
		// max +- 1
		{
			input:      0x7fffffffffffffff,
			convInt64:  -0x8000000000000000,
			convUInt64: 0x8000000000000000,
		},
		// For out-of-bounds conversion, the result is implementation-dependent.
		// This test verifies the implementation of wasm architecture.

TEXT runtime·wasmTruncS(SB), NOSPLIT, $0-0
	Get R0
	Get R0
	F64Ne // NaN
	If
		I64Const $0x8000000000000000
		Return
	End

	Get R0
	F64Const $0x7ffffffffffffc00p0 // Maximum truncated representation of 0x7fffffffffffffff
	F64Gt
	If
		I64Const $0x8000000000000000
		Return
	End

	Get R0
	F64Const $-0x7ffffffffffffc00p0 // Minimum truncated representation of -0x8000000000000000
	F64Lt
	If

		expect64(t, "a", a, 127)
		expect64(t, "b", b, 255)
		expect64(t, "c", c, 32767)
		expect64(t, "d", d, 65535)
		expect64(t, "e", e, float64(int32(0x7fffffff)))
		expect64(t, "f", f, float64(uint32(0xffffffff)))
		expect64(t, "g", g, float64(int64(0x7fffffffffffffff)))
		expect64(t, "h", h, float64(uint64(0xffffffffffffffff)))

			isDir:   true,
		},
		"drwxr-xr-x 0 1970-01-01 12:00:00 home/gopher/",
		"d home/gopher/",
	},
	{
		formatTest{
			name:    "big",
			size:    0x7fffffffffffffff,
			mode:    ModeIrregular | 0o644,
			modTime: time.Date(1970, time.January, 1, 12, 0, 0, 0, time.UTC),
			isDir:   false,
		},
		"?rw-r--r-- 9223372036854775807 1970-01-01 12:00:00 big",
		"? big",
	},
	{

var szs = []sizedTestData{
	sizedTestData{name: "uint64", sn: "64", u: []uint64{0, 1, 4294967296, 0xffffFFFFffffFFFF}},
	sizedTestData{name: "int64", sn: "64", i: []int64{-0x8000000000000000, -0x7FFFFFFFFFFFFFFF,
		-4294967296, -1, 0, 1, 4294967296, 0x7FFFFFFFFFFFFFFE, 0x7FFFFFFFFFFFFFFF}},

	sizedTestData{name: "uint32", sn: "32", u: []uint64{0, 1, 4294967295}},
	sizedTestData{name: "int32", sn: "32", i: []int64{-0x80000000, -0x7FFFFFFF, -1, 0,
		1, 0x7FFFFFFF}},

		},
		{
			example: hex("1a000f4240"),
			decoded: int64(1000000),
		},
		{
			example: hex("1b000000e8d4a51000"),
			decoded: int64(1000000000000),
		},
		{
			example: hex("1bffffffffffffffff"),
			reject:  "2^64-1 overflows int64 and falling back to float64 (as with JSON) loses distinction between float and integer",
		},
		{
			example: hex("c249010000000000000000"),

	{name: "uint64", sn: "64", u: []uint64{3, 5, 7, 9, 10, 11, 13, 19, 21, 25, 27, 37, 41, 45, 73, 81}, oponly: "mul"},

	{name: "int64", sn: "64", i: []int64{-0x8000000000000000, -0x7FFFFFFFFFFFFFFF,
		-4294967296, -1, 0, 1, 4294967296, 0x7FFFFFFFFFFFFFFE, 0x7FFFFFFFFFFFFFFF}},
	{name: "int64", sn: "64", i: []int64{-9, -5, -3, 3, 5, 7, 9, 10, 11, 13, 19, 21, 25, 27, 37, 41, 45, 73, 81}, oponly: "mul"},