QSAX_ZZ:           "QSAX.ZZ",
	QSUB_EQ:           "QSUB.EQ",
	QSUB_NE:           "QSUB.NE",
	QSUB_CS:           "QSUB.CS",
	QSUB_CC:           "QSUB.CC",
	QSUB_MI:           "QSUB.MI",
	QSUB_PL:           "QSUB.PL",
	QSUB_VS:           "QSUB.VS",
	QSUB_VC:           "QSUB.VC",
	QSUB_HI:           "QSUB.HI",
	QSUB_LS:           "QSUB.LS",
	QSUB_GE:           "QSUB.GE",
	QSUB_LT:           "QSUB.LT",

			mwq.Qualifiers = mergeQualifiers(q, mwq.Qualifiers)
		} else {
			// Merge adjacent qualifiers.  This case
			// happens with multi-dimensional array types.
			if qsub, ok := ret.(*TypeWithQualifiers); ok {
				q = mergeQualifiers(q, qsub.Qualifiers)
				ret = qsub.Base
			}
			ret = &TypeWithQualifiers{Base: ret, Qualifiers: q}
		}
		st.subs.add(ret)
	}

	return ret
}

	// FSUB <Sd>, <Sn>, <Sm>
	{0xffe0fc00, 0x1e203800, FSUB, instArgs{arg_Sd, arg_Sn, arg_Sm}, nil},
	// FSUB <Dd>, <Dn>, <Dm>
	{0xffe0fc00, 0x1e603800, FSUB, instArgs{arg_Dd, arg_Dn, arg_Dm}, nil},
	// FSUB <Vd>.<t>, <Vn>.<t>, <Vm>.<t>

			gwc.mu.Unlock()
			if !ok {
				continue
			}
		} else {
			qr := gwc.gatewayInterest(acc.Name, subj)
			queues = queuesa[:0]
			for i := 0; i < len(qr.qsubs); i++ {
				qsubs := qr.qsubs[i]
				queue := qsubs[0].queue
				add := true
				for _, qn := range qgroups {
					if bytes.Equal(queue, qn) {
						add = false
						break
					}
				}
				if add {

		fallthrough

	case FCMP, FCMPE:
		if _, ok := inst.Args[1].(Imm); ok {
			args[1] = "$(0.0)"
		}
		fallthrough

	case FADD, FSUB, FMUL, FNMUL, FDIV, FMAX, FMIN, FMAXNM, FMINNM, FCSEL, FMADD, FMSUB, FNMADD, FNMSUB:
		if strings.HasSuffix(op, "MADD") || strings.HasSuffix(op, "MSUB") {
			args[2], args[3] = args[3], args[2]
		}
		if r, ok := inst.Args[0].(Reg); ok {
			rno := uint16(r)

	if symname == nil {
		symname = func(uint64) (string, uint64) { return "", 0 }
	}

	// Adjust opcode [sic].
	switch inst.Op {
	case FDIV, FDIVR, FSUB, FSUBR, FDIVP, FDIVRP, FSUBP, FSUBRP:
		// DC E0, DC F0: libopcodes swaps FSUBR/FSUB and FDIVR/FDIV, at least
		// if you believe the Intel manual is correct (the encoding is irregular as given;
		// libopcodes uses the more regular expected encoding).

)

// A SubFS is a file system with a Sub method.
type SubFS interface {
	FS

	// Sub returns an FS corresponding to the subtree rooted at dir.
	Sub(dir string) (FS, error)
}

// Sub returns an [FS] corresponding to the subtree rooted at fsys's dir.
//
// If dir is ".", Sub returns fsys unchanged.
// Otherwise, if fs implements [SubFS], Sub returns fsys.Sub(dir).
// Otherwise, Sub returns a new [FS] implementation sub that,

			if !isVchar(r) && !isWSP(r) {
				return "", fmt.Errorf("mail: bad character in quoted-string: %q", r)
			}

			qsb = append(qsb, r)
			escaped = false

		case isQtext(r) || isWSP(r):
			// qtext (printable US-ASCII excluding " and \), or
			// FWS (almost; we're ignoring CRLF)
			qsb = append(qsb, r)

		case r == '"':
			break Loop

		case r == '\\':
			escaped = true

		default:

		nre := re
		for i, sub := range re.Sub {
			nsub := sub.Simplify()
			if nre == re && nsub != sub {
				// Start a copy.
				nre = new(Regexp)
				*nre = *re
				nre.Rune = nil
				nre.Sub = append(nre.Sub0[:0], re.Sub[:i]...)
			}
			if nre != re {
				nre.Sub = append(nre.Sub, nsub)
			}
		}
		return nre

	case OpStar, OpPlus, OpQuest:
		sub := re.Sub[0].Simplify()

		}
	}

	// Clone should make a copy of bSub, since bSub is just part of b and so is in the arena.
	bSub := b[1:3]
	bSubCopy := UserArenaClone(bSub)
	if unsafe.Pointer(&bSub[0]) == unsafe.Pointer(&bSubCopy[0]) {
		t.Errorf("Clone did not make a copy: %#v -> %#v", bSub, bSubCopy)
	}
	if len(bSub) != len(bSubCopy) {
		t.Errorf("Clone made an incorrect copy (bad length): %d -> %d", len(bSub), len(bSubCopy))
	} else {