chki64(int64(i8), ci8&0xffffffffffffffff-1<<64)
	chki64(int64(i16), ci16&0xffffffffffffffff-1<<64)
	chki64(int64(i32), ci32&0xffffffffffffffff-1<<64)
	chki64(int64(i64), ci64&0xffffffffffffffff-1<<64)
	chki64(int64(u8), cu8&0xffffffffffffffff)
	chki64(int64(u16), cu16&0xffffffffffffffff)
	chki64(int64(u32), cu32&0xffffffffffffffff)
	chki64(int64(u64), cu64&0xffffffffffffffff-1<<64)
	//	chki64(int64(f32), 0)

		}
	}
}

func TestAnd64(t *testing.T) {
	// Basic sanity check.
	x := uint64(0xffffffffffffffff)
	sink = &x
	for i := uint64(0); i < 64; i++ {
		old := x
		v := atomic.And64(&x, ^(1 << i))
		if r := uint64(0xffffffffffffffff) << (i + 1); x != r || v != old {
			t.Fatalf("clearing bit %#x: want %#x, got new %#x and old %#v", uint64(1<<i), r, x, v)
		}
	}

	CMPQ	DX,CX
	JAE     isBig_floor
	MOVQ	AX, X0 // X0 = x
	CVTTSD2SQ	X0, AX
	CVTSQ2SD	AX, X1 // X1 = float(int(x))
	CMPSD	X1, X0, 1 // compare LT; X0 = 0xffffffffffffffff or 0
	MOVSD	$(-1.0), X2
	ANDPD	X2, X0 // if x < float(int(x)) {X0 = -1} else {X0 = 0}
	ADDSD	X1, X0
	MOVSD	X0, ret+8(FP)
	RET
isBig_floor:
	MOVQ    AX, ret+8(FP) // return x
	RET

package main

// #include <stdlib.h>
import "C"

import (
	"fmt"
	"runtime"
)

func main() {
	var size C.size_t
	size--

	// The Dragonfly libc succeeds when asked to allocate
	// 0xffffffffffffffff bytes, so pass a different value that
	// causes it to fail.
	if runtime.GOOS == "dragonfly" {
		size = C.size_t(0x7fffffff << (32 * (^uintptr(0) >> 63)))
	}

	p := C.malloc(size)
	if p == nil {

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

	Get R0
	F64Const $0xfffffffffffff800p0 // Maximum truncated representation of 0xffffffffffffffff
	F64Gt
	If
		I64Const $0x8000000000000000
		Return
	End

	Get R0
	F64Const $0.
	F64Lt
	If
		I64Const $0x8000000000000000
		Return
	End

	Get R0
	I64TruncF64U
	Return

			convUInt64: 0x8000000000000000,
		},
		{
			input:      -0x7ffffffffffffdfe,
			convInt64:  -0x7ffffffffffffc00,
			convUInt64: 0x8000000000000000,
		},
		// umax +- 1
		{
			input:      0xffffffffffffffff,
			convInt64:  -0x8000000000000000,
			convUInt64: 0x8000000000000000,
		},
		{
			input:      0x10000000000000000,
			convInt64:  -0x8000000000000000,
			convUInt64: 0x8000000000000000,
		},
		{

	// fits in uint64. go/constant uses a different representation for
	// values larger than int64, but the cmd/asm parser can't parse
	// anything bigger than a uint64.
	bigInt = 0xffffffffffffffff

	stringVal = "test"

	longStringVal = "this_is_a_string_constant_longer_than_seventy_characters_which_used_to_fail_see_issue_50253"
)

var (
	smallIntAsm   int64
	bigIntAsm     uint64

		want    uint64
		wantErr string
	}
	tests := []testCase{
		{"x", 0, "invalid byte in chunk length"},
		{"0000000000000000", 0, ""},
		{"0000000000000001", 1, ""},
		{"ffffffffffffffff", 1<<64 - 1, ""},
		{"FFFFFFFFFFFFFFFF", 1<<64 - 1, ""},
		{"000000000000bogus", 0, "invalid byte in chunk length"},
		{"00000000000000000", 0, "http chunk length too large"}, // could accept if we wanted

			// break the parser. Verify that integers in the opposite bases still
			// parse correctly.
			in: `go test fuzz v1
int(0x0)
int32(0x41)
int64(0xfffffffff)
uint32(0xcafef00d)
uint64(0xffffffffffffffff)
uint8(0b0000000)
byte(0x0)
byte('\000')
byte('\u0000')
byte('\'')
math.Float64frombits(9221120237041090562)
math.Float32frombits(2143289345)`,
			want: `go test fuzz v1
int(0)
rune('A')

	tests := []struct {
		// inputs
		src  RotateParams
		mask uint64

		// results
		in  *RotateParams
		out *RotateParams
	}{
		{
			src:  RotateParams{Start: 48, End: 15, Amount: 16},
			mask: 0xffffffffffffffff,
			in:   &RotateParams{Start: 48, End: 15, Amount: 16},
			out:  &RotateParams{Start: 48, End: 15, Amount: 16},
		},
		{
			src:  RotateParams{Start: 16, End: 47, Amount: 0},
			mask: 0x00000000ffffffff,