func testAtomic64() {
	test_z64 = 42
	test_x64 = 0
	if atomic.Cas64(&test_z64, test_x64, 1) {
		throw("cas64 failed")
	}
	if test_x64 != 0 {
		throw("cas64 failed")
	}
	test_x64 = 42
	if !atomic.Cas64(&test_z64, test_x64, 1) {
		throw("cas64 failed")
	}
	if test_x64 != 42 || test_z64 != 1 {
		throw("cas64 failed")
	}
	if atomic.Load64(&test_z64) != 1 {
		throw("load64 failed")
	}

			atomic.Cas(ptr, 0, 1)
		}
	})
}

func BenchmarkCas64(b *testing.B) {
	var x uint64
	x = 1
	ptr := &x
	b.RunParallel(func(pb *testing.PB) {
		for pb.Next() {
			atomic.Cas64(ptr, 1, 0)
			atomic.Cas64(ptr, 0, 1)
		}
	})
}
func BenchmarkXchg(b *testing.B) {
	var x uint32
	x = 1
	ptr := &x
	b.RunParallel(func(pb *testing.PB) {
		var y uint32
		y = 1
		for pb.Next() {

TEXT ·Xaddint32(SB), NOSPLIT, $0-12
	JMP	·Xadd(SB)

TEXT ·Xaddint64(SB), NOSPLIT, $0-20
	JMP	·Xadd64(SB)

// bool ·Cas64(uint64 *val, uint64 old, uint64 new)
// Atomically:
//	if(*val == old){
//		*val = new;
//		return 1;
//	} else {
//		return 0;
//	}
TEXT ·Cas64(SB), NOSPLIT, $0-21
	NO_LOCAL_POINTERS
	MOVL	ptr+0(FP), BP
	TESTL	$7, BP
	JZ	2(PC)
	CALL	·panicUnaligned(SB)
	MOVL	old_lo+4(FP), AX

//go:linkname Xaddint64
//go:linkname Xadd64
//go:linkname Xadduintptr
//go:linkname Xchg
//go:linkname Xchg64
//go:linkname Xchgint32
//go:linkname Xchgint64
//go:linkname Xchguintptr
//go:linkname Cas
//go:linkname Cas64
//go:linkname Casint32
//go:linkname Casint64
//go:linkname Casuintptr
//go:linkname Store
//go:linkname Store64
//go:linkname Storeint32
//go:linkname Storeint64
//go:linkname Storeuintptr

//go:noescape
func Or64(ptr *uint64, val uint64) uint64

//go:noescape
func Anduintptr(ptr *uintptr, val uintptr) uintptr

//go:noescape
func Oruintptr(ptr *uintptr, val uintptr) uintptr

//go:noescape
func Cas64(ptr *uint64, old, new uint64) bool

//go:noescape
func CasRel(ptr *uint32, old, new uint32) bool

//go:noescape
func Store(ptr *uint32, val uint32)

//go:noescape
func Store8(ptr *uint8, val uint8)

//go:noescape
func Anduintptr(ptr *uintptr, val uintptr) uintptr

//go:noescape
func Oruintptr(ptr *uintptr, val uintptr) uintptr

// NOTE: Do not add atomicxor8 (XOR is not idempotent).

//go:noescape
func Cas64(ptr *uint64, old, new uint64) bool

//go:noescape
func CasRel(ptr *uint32, old, new uint32) bool

//go:noescape
func Store(ptr *uint32, val uint32)

//go:noescape
func Store8(ptr *uint8, val uint8)

//go:noescape
func Anduintptr(ptr *uintptr, val uintptr) uintptr

//go:noescape
func Oruintptr(ptr *uintptr, val uintptr) uintptr

// NOTE: Do not add atomicxor8 (XOR is not idempotent).

//go:noescape
func Cas64(ptr *uint64, old, new uint64) bool

//go:noescape
func CasRel(ptr *uint32, old, new uint32) bool

//go:noescape
func Store(ptr *uint32, val uint32)

//go:noescape
func Store8(ptr *uint8, val uint8)

//go:noescape
func Or64(ptr *uint64, val uint64) uint64

//go:noescape
func Anduintptr(ptr *uintptr, val uintptr) uintptr

//go:noescape
func Oruintptr(ptr *uintptr, val uintptr) uintptr

//go:noescape
func Cas64(ptr *uint64, old, new uint64) bool

//go:noescape
func CasRel(ptr *uint32, old, new uint32) bool

//go:noescape
func Store(ptr *uint32, val uint32)

//go:noescape
func Store8(ptr *uint8, val uint8)

//go:noescape
func Xchg(ptr *uint32, new uint32) uint32

//go:noescape
func Xchg64(ptr *uint64, new uint64) uint64

//go:noescape
func Xchguintptr(ptr *uintptr, new uintptr) uintptr

//go:noescape
func Cas64(ptr *uint64, old, new uint64) bool

//go:noescape

//go:noescape
func Or64(ptr *uint64, val uint64) uint64

//go:noescape
func Anduintptr(ptr *uintptr, val uintptr) uintptr

//go:noescape
func Oruintptr(ptr *uintptr, val uintptr) uintptr

//go:noescape
func Cas64(ptr *uint64, old, new uint64) bool

//go:noescape
func CasRel(ptr *uint32, old, new uint32) bool

//go:noescape
func Store(ptr *uint32, val uint32)

//go:noescape
func Store8(ptr *uint8, val uint8)