// memmove copies size bytes to dst from src. No write barriers are used.
//
//go:noescape
func memmove(dst, src unsafe.Pointer, size uintptr)

// typedmemmove copies a value of type t to dst from src.
//
//go:noescape
func typedmemmove(t *abi.Type, dst, src unsafe.Pointer)

// typedmemclr zeros the value at ptr of type t.
//
//go:noescape
func typedmemclr(t *abi.Type, ptr unsafe.Pointer)

func chanlen(hchan any) int
func chancap(hchan any) int

var writeBarrier struct {
	enabled bool
	pad     [3]byte
	cgo     bool
	alignme uint64
}

// *byte is really *runtime.Type
func typedmemmove(typ *byte, dst *any, src *any)
func typedmemclr(typ *byte, dst *any)
func typedslicecopy(typ *byte, dstPtr *any, dstLen int, srcPtr *any, srcLen int) int

func selectnbsend(hchan chan<- any, elem *any) bool

					// Write with a write barrier.
					*(*unsafe.Pointer)(dst.k) = *(*unsafe.Pointer)(k)
				} else {
					*(*uint32)(dst.k) = *(*uint32)(k)
				}

				typedmemmove(t.Elem, dst.e, e)
				dst.i++
				// These updates might push these pointers past the end of the
				// key or elem arrays.  That's ok, as we have the overflow pointer

	{"chanrecv2", funcTag, 102},
	{"chansend1", funcTag, 104},
	{"closechan", funcTag, 105},
	{"chanlen", funcTag, 106},
	{"chancap", funcTag, 106},
	{"writeBarrier", varTag, 108},
	{"typedmemmove", funcTag, 109},
	{"typedmemclr", funcTag, 110},
	{"typedslicecopy", funcTag, 111},
	{"selectnbsend", funcTag, 112},
	{"selectnbrecv", funcTag, 113},
	{"selectsetpc", funcTag, 114},
	{"selectgo", funcTag, 115},

				}
				dst.b.tophash[dst.i&(abi.MapBucketCount-1)] = top // mask dst.i as an optimization, to avoid a bounds check

				// Copy key.
				*(*string)(dst.k) = *(*string)(k)

				typedmemmove(t.Elem, dst.e, e)
				dst.i++
				// These updates might push these pointers past the end of the
				// key or elem arrays.  That's ok, as we have the overflow pointer

		raceReadObjectPC(t, v, getcallerpc(), abi.FuncPCABIInternal(convT))
	}
	if msanenabled {
		msanread(v, t.Size_)
	}
	if asanenabled {
		asanread(v, t.Size_)
	}
	x := mallocgc(t.Size_, t, true)
	typedmemmove(t, x, v)
	return x
}
func convTnoptr(t *_type, v unsafe.Pointer) unsafe.Pointer {
	// TODO: maybe take size instead of type?
	if raceenabled {

		xe := efaceOf(&x)
		xe._type = t
		xe.data = unsafe.Pointer(sl)
	case abi.Pointer:
		et := (*ptrtype)(unsafe.Pointer(t)).Elem
		e2 := newobject(et)
		typedmemmove(et, e2, e.data)
		xe := efaceOf(&x)
		xe._type = t
		xe.data = e2
	}
	return x
}

const (
	// userArenaChunkBytes is the size of a user arena chunk.
	userArenaChunkBytesMax = 8 << 20

	ir.Syms.ARM64HasATOMICS = typecheck.LookupRuntimeVar("arm64HasATOMICS") // bool
	ir.Syms.Staticuint64s = typecheck.LookupRuntimeVar("staticuint64s")
	ir.Syms.Typedmemmove = typecheck.LookupRuntimeFunc("typedmemmove")
	ir.Syms.Udiv = typecheck.LookupRuntimeVar("udiv")                 // asm func with special ABI
	ir.Syms.WriteBarrier = typecheck.LookupRuntimeVar("writeBarrier") // struct { bool; ... }