s.startBlock(bElse)
	switch n.Op() {
	case ir.OLEN:
		// length is stored in the first word for map/chan
		s.vars[n] = s.load(lenType, x)
	case ir.OCAP:
		// capacity is stored in the second word for chan
		sw := s.newValue1I(ssa.OpOffPtr, lenType.PtrTo(), lenType.Size(), x)
		s.vars[n] = s.load(lenType, sw)
	default:
		s.Fatalf("op must be OLEN or OCAP")
	}
	s.endBlock()
	bElse.AddEdgeTo(bAfter)