for pb.Next() {
			atomic.Xadd(ptr, 1)
		}
	})
}

func BenchmarkXadd64(b *testing.B) {
	var x uint64
	ptr := &x
	b.RunParallel(func(pb *testing.PB) {
		for pb.Next() {
			atomic.Xadd64(ptr, 1)
		}
	})
}

func BenchmarkCas(b *testing.B) {
	var x uint32
	x = 1
	ptr := &x
	b.RunParallel(func(pb *testing.PB) {
		for pb.Next() {
			atomic.Cas(ptr, 1, 0)

	shouldPanic(t, "Load64", func() { atomic.Load64(up64) })
	shouldPanic(t, "Loadint64", func() { atomic.Loadint64(p64) })
	shouldPanic(t, "Store64", func() { atomic.Store64(up64, 0) })
	shouldPanic(t, "Xadd64", func() { atomic.Xadd64(up64, 1) })
	shouldPanic(t, "Xchg64", func() { atomic.Xchg64(up64, 1) })
	shouldPanic(t, "Cas64", func() { atomic.Cas64(up64, 1, 2) })
}

func TestAnd8(t *testing.T) {
	// Basic sanity check.

	}
	atomic.Store64(&test_z64, (1<<40)+1)
	if atomic.Load64(&test_z64) != (1<<40)+1 {
		throw("store64 failed")
	}
	if atomic.Xadd64(&test_z64, (1<<40)+1) != (2<<40)+2 {
		throw("xadd64 failed")
	}
	if atomic.Load64(&test_z64) != (2<<40)+2 {
		throw("xadd64 failed")
	}
	if atomic.Xchg64(&test_z64, (3<<40)+3) != (2<<40)+2 {
		throw("xchg64 failed")
	}
	if atomic.Load64(&test_z64) != (3<<40)+3 {

//go:noescape
func LoadAcquintptr(ptr *uintptr) uintptr

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

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

//go:noescape
func Xadd64(addr *uint64, delta int64) uint64

//go:noescape
func Xchg64(addr *uint64, v uint64) uint64

//go:noescape
func Load64(addr *uint64) uint64

//go:noescape
func Store8(addr *uint8, v uint8)

TEXT ·Loadint32(SB),NOSPLIT,$0-8
	JMP	·Load(SB)

TEXT ·Loadint64(SB),NOSPLIT,$0-12
	JMP	·Load64(SB)

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

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

TEXT ·Casp1(SB),NOSPLIT,$0-13
	JMP	·Cas(SB)

TEXT ·Xchgint32(SB),NOSPLIT,$0-12
	JMP	·Xchg(SB)

TEXT ·Xchgint64(SB),NOSPLIT,$0-20
	JMP	·Xchg64(SB)

TEXT ·Xchguintptr(SB),NOSPLIT,$0-12

	stats := memstats.heapStats.acquire()
	atomic.Xaddint64(&stats.committed, -int64(s.npages*pageSize))
	atomic.Xaddint64(&stats.inHeap, -int64(s.npages*pageSize))
	atomic.Xadd64(&stats.largeFreeCount, 1)
	atomic.Xadd64(&stats.largeFree, int64(s.elemsize))
	memstats.heapStats.release()

	// This counts as a free, so update heapLive.
	gcController.update(-int64(s.elemsize), 0)

			// value. If it does so, then metrics that subtract object footprint
			// from inHeap might overflow. See #67019.
			stats := memstats.heapStats.acquire()
			atomic.Xadd64(&stats.largeFreeCount, 1)
			atomic.Xadd64(&stats.largeFree, int64(size))
			memstats.heapStats.release()

			// Count the free in the inconsistent, internal stats.
			gcController.totalFree.Add(int64(size))

	}
	if w.bytesMarked != 0 {
		// dispose happens relatively infrequently. If this
		// atomic becomes a problem, we should first try to
		// dispose less and if necessary aggregate in a per-P
		// counter.
		atomic.Xadd64(&work.bytesMarked, int64(w.bytesMarked))
		w.bytesMarked = 0
	}
	if w.heapScanWork != 0 {
		gcController.heapScanWork.Add(w.heapScanWork)
		w.heapScanWork = 0
	}
}

// the new updated value.
//
// This operation wraps around in the usual
// two's-complement way.
//
//go:nosplit
func (u *Uint64) Add(delta int64) uint64 {
	return Xadd64(&u.value, delta)
}

// Uintptr is an atomically accessed uintptr value.
//
// A Uintptr must not be copied.
type Uintptr struct {
	noCopy noCopy
	value  uintptr
}

	alias("sync/atomic", "AddInt64", "internal/runtime/atomic", "Xadd64", all...)
	alias("sync/atomic", "AddUint32", "internal/runtime/atomic", "Xadd", all...)
	alias("sync/atomic", "AddUint64", "internal/runtime/atomic", "Xadd64", all...)
	alias("sync/atomic", "AddUintptr", "internal/runtime/atomic", "Xadd", p4...)
	alias("sync/atomic", "AddUintptr", "internal/runtime/atomic", "Xadd64", p8...)