hv1 := typecheck.TempAt(base.Pos, ir.CurFunc, t)
		hn := typecheck.TempAt(base.Pos, ir.CurFunc, t)

		init = append(init, ir.NewAssignStmt(base.Pos, hv1, nil))
		init = append(init, ir.NewAssignStmt(base.Pos, hn, a))

		nfor.Cond = ir.NewBinaryExpr(base.Pos, ir.OLT, hv1, hn)
		nfor.Post = ir.NewAssignStmt(base.Pos, hv1, ir.NewBinaryExpr(base.Pos, ir.OADD, hv1, ir.NewInt(base.Pos, 1)))

		if v1 != nil {

	slice := ir.NewSliceExpr(base.Pos, ir.OSLICE, s, nil, newLen, nil)
	slice.SetBounded(true)
	nif.Body = []ir.Node{ir.NewAssignStmt(base.Pos, s, slice)}

	// else { s = growslice(oldPtr, newLen, oldCap, num, T) }
	call := walkGrowslice(s, nif.PtrInit(), oldPtr, newLen, oldCap, num)
	nif.Else = []ir.Node{ir.NewAssignStmt(base.Pos, s, call)}

	nodes.Append(nif)

	// Index to start copying into s.
	//   idx = newLen - len(l2)

		lhs.RType = n.RType

		zero := ir.NewAssignStmt(base.Pos, i, ir.NewInt(base.Pos, 0))
		cond := ir.NewBinaryExpr(base.Pos, ir.OLT, i, ir.NewInt(base.Pos, tk.NumElem()))
		incr := ir.NewAssignStmt(base.Pos, i, ir.NewBinaryExpr(base.Pos, ir.OADD, i, ir.NewInt(base.Pos, 1)))

		var body ir.Node = ir.NewAssignStmt(base.Pos, lhs, rhs)
		body = typecheck.Stmt(body)

	var l []ir.Node
	l = append(l, ir.NewAssignStmt(base.Pos, nl, n.X))
	l = append(l, ir.NewAssignStmt(base.Pos, nr, n.Y))

	nfrm := ir.NewUnaryExpr(base.Pos, ir.OSPTR, nr)
	nto := ir.NewUnaryExpr(base.Pos, ir.OSPTR, nl)

	nlen := typecheck.TempAt(base.Pos, ir.CurFunc, types.Types[types.TINT])

	// n = len(to)
	l = append(l, ir.NewAssignStmt(base.Pos, nlen, ir.NewUnaryExpr(base.Pos, ir.OLEN, nl)))

		init.Append(ir.NewAssignStmt(base.Pos, typeWord, typecheck.Conv(typecheck.Conv(itab, types.Types[types.TUNSAFEPTR]), typeWord.Type())))
		nif := ir.NewIfStmt(base.Pos, typecheck.Expr(ir.NewBinaryExpr(base.Pos, ir.ONE, typeWord, typecheck.NodNil())), nil, nil)
		nif.Body = []ir.Node{ir.NewAssignStmt(base.Pos, typeWord, itabType(typeWord))}
		init.Append(nif)

		// Build the result.

		// Evaluate left-hand side.
		lhs := o.expr(n.X, nil)
		o.out = append(o.out, typecheck.Stmt(ir.NewAssignStmt(base.Pos, r, lhs)))

		// Evaluate right-hand side, save generated code.
		saveout := o.out
		o.out = nil
		t := o.markTemp()
		o.edge()
		rhs := o.expr(n.Y, nil)
		o.out = append(o.out, typecheck.Stmt(ir.NewAssignStmt(base.Pos, r, rhs)))
		o.popTemp(t)
		gen := o.out
		o.out = saveout

		// use conv to ensure r is assignable to l (#13263).
		dst := ir.Node(l)
		if loff != 0 || !types.Identical(typ, l.Type()) {
			dst = ir.NewNameOffsetExpr(base.Pos, l, loff, typ)
		}
		s.append(ir.NewAssignStmt(base.Pos, dst, typecheck.Conv(r, typ)))
		return true

	case ir.ONIL:
		return true

	case ir.OLITERAL:
		if ir.IsZero(r) {
			return true
		}

	}
	return cheapExpr(n, init)
}

func copyExpr(n ir.Node, t *types.Type, init *ir.Nodes) ir.Node {
	l := typecheck.TempAt(base.Pos, ir.CurFunc, t)
	appendWalkStmt(init, ir.NewAssignStmt(base.Pos, l, n))
	return l
}

func walkAddString(n *ir.AddStringExpr, init *ir.Nodes) ir.Node {
	c := len(n.List)

	if c < 2 {
		base.Fatalf("walkAddString count %d too small", c)
	}

					base.Fatalf("unhandled type switch case %v", ncase.List[0])
				}
				val.SetType(caseVar.Type())
				val.SetTypecheck(1)
			}
			l := []ir.Node{
				ir.NewDecl(ncase.Pos(), ir.ODCL, caseVar),
				ir.NewAssignStmt(ncase.Pos(), caseVar, val),
			}
			typecheck.Stmts(l)
			sw.Compiled.Append(l...)
		}
		sw.Compiled.Append(ncase.Body...)
		sw.Compiled.Append(br)
	}

	walkStmtList(sw.Compiled)
	sw.Tag = nil

	if !ir.Any(*np, func(n ir.Node) bool { return n.Op() != ir.ONEW && callOrChan(n) }) {
		return
	}

	tmp := TempAt(base.Pos, ir.CurFunc, (*np).Type())
	as := ir.NewAssignStmt(base.Pos, tmp, *np)
	as.PtrInit().Append(Stmt(ir.NewDecl(n.Pos(), ir.ODCL, tmp)))
	*np = tmp

	n.PtrInit().Append(Stmt(as))
}

// RewriteMultiValueCall rewrites multi-valued f() to use temporaries,