case ir.ODIV:
		n := n.(*ir.BinaryExpr)
		a := s.expr(n.X)
		b := s.expr(n.Y)
		if n.Type().IsComplex() {
			// TODO this is not executed because the front-end substitutes a runtime call.
			// That probably ought to change; with modest optimization the widen/narrow
			// conversions could all be elided in larger expression trees.
			mulop := ssa.OpMul64F
			addop := ssa.OpAdd64F