// args[i] == 0 marks the end of the argument list.
type instFormat struct {
	mask     uint32
	value    uint32
	priority int8
	op       Op
	opBits   uint64
	args     instArgs
}

type instArgs [4]instArg

var (
	errMode    = fmt.Errorf("unsupported execution mode")
	errShort   = fmt.Errorf("truncated instruction")
	errUnknown = fmt.Errorf("unknown instruction")
)

var decoderCover []bool

//       The encoding size = 11, Q = 0 is reserved.
//
// - arg_Vt_1_arrangement_H_index__Q_S_size_1:
//     one register with arrangement:H and element index encoded in "Q:S:size<1>".

type instArg uint16

const (
	_ instArg = iota
	arg_Bt
	arg_Cm
	arg_Cn
	arg_cond_AllowALNV_Normal
	arg_conditional
	arg_cond_NotAllowALNV_Invert
	arg_Da
	arg_Dd
	arg_Dm
	arg_Dn
	arg_Dt
	arg_Dt2