if r == 0 {
			r = int(p.To.Reg)
		}
		if r0iszero != 0 /*TypeKind(100016)*/ && p.To.Reg == 0 {
			c.ctxt.Diag("literal operation on R0\n%v", p)
		}
		if int32(int16(v)) != v {
			log.Fatalf("mishandled instruction %v", p)
		}
		o1 = AOP_IRR(c.opirr(p.As), uint32(p.To.Reg), uint32(r), uint32(v))

	case 5: /* syscall */
		o1 = c.oprrr(p.As)

	case 6: /* logical op Rb,[Rs,]Ra; no literal */