r.Lhs = []ir.Node{chosen, recvOK}
	fn := typecheck.LookupRuntime("selectgo")
	var fnInit ir.Nodes
	r.Rhs = []ir.Node{mkcall1(fn, fn.Type().ResultsTuple(), &fnInit, bytePtrToIndex(selv, 0), bytePtrToIndex(order, 0), pc0, ir.NewInt(base.Pos, int64(nsends)), ir.NewInt(base.Pos, int64(nrecvs)), ir.NewBool(base.Pos, dflt == nil))}
	init = append(init, fnInit...)
	init = append(init, typecheck.Stmt(r))

				inst.Prefix[i] |= PrefixImplicit
			}
		}
	}

	switch inst.Op {
	case AAA, AAS, CBW, CDQE, CLC, CLD, CLI, CLTS, CMC, CPUID, CQO, CWD, DAA, DAS,
		FDECSTP, FINCSTP, FNCLEX, FNINIT, FNOP, FWAIT, HLT,
		ICEBP, INSB, INSD, INSW, INT, INTO, INVD, IRET, IRETQ,
		LAHF, LEAVE, LRET, MONITOR, MWAIT, NOP, OUTSB, OUTSD, OUTSW,
		PAUSE, POPA, POPF, POPFQ, PUSHA, PUSHF, PUSHFQ,

	FLDLG2:          "FLDLG2",
	FLDLN2:          "FLDLN2",
	FLDPI:           "FLDPI",
	FLDZ:            "FLDZ",
	FMUL:            "FMUL",
	FMULP:           "FMULP",
	FNCLEX:          "FNCLEX",
	FNINIT:          "FNINIT",
	FNOP:            "FNOP",
	FNSAVE:          "FNSAVE",
	FNSTCW:          "FNSTCW",
	FNSTENV:         "FNSTENV",
	FNSTSW:          "FNSTSW",
	FPATAN:          "FPATAN",

	//TODO: FMULL (R11)                     // 41dc0b
	//TODO: FMULP F0, F2                    // deca
	//TODO: FMULP F0, F3                    // decb
	//TODO: FNCLEX                          // dbe2
	//TODO: FNINIT                          // dbe3
	FNOP                                    // d9d0
	//TODO: FNSAVEL (BX)                    // dd33
	//TODO: FNSAVEL (R11)                   // 41dd33