if len(interfaceCases) > 0 {

			// Build an internal/abi.InterfaceSwitch descriptor to pass to the runtime.
			lsym := types.LocalPkg.Lookup(fmt.Sprintf(".interfaceSwitch.%d", interfaceSwitchGen)).LinksymABI(obj.ABI0)
			interfaceSwitchGen++
			c := rttype.NewCursor(lsym, 0, rttype.InterfaceSwitch)
			c.Field("Cache").WritePtr(typecheck.LookupRuntimeVar("emptyInterfaceSwitchCache"))

	return ir.NewAddrExpr(pos, Expr(n))
}

// LinksymAddr returns a new expression that evaluates to the address
// of lsym. typ specifies the type of the addressed memory.
func LinksymAddr(pos src.XPos, lsym *obj.LSym, typ *types.Type) *ir.AddrExpr {
	n := ir.NewLinksymExpr(pos, lsym, typ)
	return Expr(NodAddrAt(pos, n)).(*ir.AddrExpr)
}

func NodNil() ir.Node {
	return ir.NewNilExpr(base.Pos, types.Types[types.TNIL])

		//     ADD $offset, R12
		//     MOVD R12, LR
		//     BL (LR)
		var sym *obj.LSym
		if p.As == obj.ADUFFZERO {
			sym = c.ctxt.Lookup("runtime.duffzero")
		} else {
			sym = c.ctxt.Lookup("runtime.duffcopy")
		}
		// Retrieve or create the TOC anchor.
		symtoc := c.ctxt.LookupInit("TOC."+sym.Name, func(s *obj.LSym) {
			s.Type = objabi.SDATA
			s.Set(obj.AttrDuplicateOK, true)
			s.Set(obj.AttrStatic, true)

		defer s.popLine()
	}

	if s.canSSA(n) {
		s.Fatalf("addr of canSSA expression: %+v", n)
	}

	t := types.NewPtr(n.Type())
	linksymOffset := func(lsym *obj.LSym, offset int64) *ssa.Value {
		v := s.entryNewValue1A(ssa.OpAddr, t, lsym, s.sb)
		// TODO: Make OpAddr use AuxInt as well as Aux.
		if offset != 0 {
			v = s.entryNewValue1I(ssa.OpOffPtr, v.Type, offset, v)
		}
		return v
	}

	Arch:       sys.ArchWasm,
	Init:       instinit,
	Preprocess: preprocess,
	Assemble:   assemble,
	UnaryDst:   unaryDst,
}

var (
	morestack       *obj.LSym
	morestackNoCtxt *obj.LSym
	sigpanic        *obj.LSym
)

const (
	/* mark flags */
	WasmImport = 1 << 0
)

const (
	// This is a special wasm module name that when used as the module name

		//     $MOV runtime.duffxxx@GOT, $reg
		//     $LEA $offset($reg), $reg
		//     CALL $reg
		// (we use LEAx rather than ADDx because ADDx clobbers
		// flags and duffzero on 386 does not otherwise do so).
		var sym *obj.LSym
		if p.As == obj.ADUFFZERO {
			sym = ctxt.LookupABI("runtime.duffzero", obj.ABIInternal)
		} else {
			sym = ctxt.LookupABI("runtime.duffcopy", obj.ABIInternal)
		}
		offset := p.To.Offset
		p.As = mov

	"VSEL",
	"VSL",
	"VSLB",
	"VSLDB",
	"VSRA",
	"VSRAB",
	"VSRL",
	"VSRLB",
	"VSEG",
	"VSEGB",
	"VSEGH",
	"VSEGF",
	"VST",
	"VSTEH",
	"VSTEF",
	"VSTEG",
	"VSTEB",
	"VSTM",
	"VSTL",
	"VSTRC",
	"VSTRCB",
	"VSTRCH",
	"VSTRCF",
	"VSTRCBS",
	"VSTRCHS",
	"VSTRCFS",
	"VSTRCZB",
	"VSTRCZH",
	"VSTRCZF",
	"VSTRCZBS",
	"VSTRCZHS",
	"VSTRCZFS",
	"VS",

	StringData(string) *obj.LSym

	// Given the name for a compound type, returns the name we should use
	// for the parts of that compound type.
	SplitSlot(parent *LocalSlot, suffix string, offset int64, t *types.Type) LocalSlot

	// Syslook returns a symbol of the runtime function/variable with the
	// given name.
	Syslook(string) *obj.LSym

		{name: "LoweredTailCall", argLength: 1, reg: regInfo{clobbers: callerSave}, aux: "CallOff", call: true, tailCall: true},                  // tail call static function aux.(*obj.LSym). arg0=mem, auxint=argsize, returns mem

	values map[string]*Value
}

var emptyPass pass = pass{
	name: "empty pass",
}

// AuxCallLSym returns an AuxCall initialized with an LSym that should pass "check"
// as the Aux of a static call.
func AuxCallLSym(name string) *AuxCall {
	return &AuxCall{Fn: &obj.LSym{}}
}

// Fun takes the name of an entry bloc and a series of Bloc calls, and
// returns a fun containing the composed Func. entry must be a name