faultOnNilArg0: true,
		symEffect:      SymRead,
		asm:            x86.ACMPB,
		reg: regInfo{
			inputs: []inputInfo{
				{1, 255},   // AX CX DX BX SP BP SI DI
				{0, 65791}, // AX CX DX BX SP BP SI DI SB
			},
		},
	},
	{
		name:           "CMPLconstload",
		auxType:        auxSymValAndOff,
		argLen:         2,
		faultOnNilArg0: true,
		symEffect:      SymRead,

			}
			if v.nilCheck {
				fmt.Fprintln(w, "nilCheck: true,")
			}
			if v.faultOnNilArg0 {
				fmt.Fprintln(w, "faultOnNilArg0: true,")
				if v.aux != "Sym" && v.aux != "SymOff" && v.aux != "SymValAndOff" && v.aux != "Int64" && v.aux != "Int32" && v.aux != "" {
					log.Fatalf("faultOnNilArg0 with aux %s not allowed", v.aux)
				}
			}
			if v.faultOnNilArg1 {

				unnecessary.clear()
			}

			// Find any pointers that this op is guaranteed to fault on if nil.
			var ptrstore [2]*Value
			ptrs := ptrstore[:0]
			if opcodeTable[v.Op].faultOnNilArg0 && (faultOnLoad || v.Type.IsMemory()) {
				// On AIX, only writing will fault.
				ptrs = append(ptrs, v.Args[0])
			}

		{name: "LoweredNilCheck", argLength: 2, reg: regInfo{inputs: []regMask{gp}}, nilCheck: true, faultOnNilArg0: true}, // panic if arg0 is nil. arg1=mem

	call              bool      // is a function call
	tailCall          bool      // is a tail call
	nilCheck          bool      // this op is a nil check on arg0
	faultOnNilArg0    bool      // this op will fault if arg0 is nil (and aux encodes a small offset)
	faultOnNilArg1    bool      // this op will fault if arg1 is nil (and aux encodes a small offset)

		log.Fatalf("%s: non-compound expr in genMatch0: %q", rr.Loc, match)
	}
	op, oparch, typ, auxint, aux, args := parseValue(match, arch, rr.Loc)

	checkOp = fmt.Sprintf("Op%s%s", oparch, op.name)

	if op.faultOnNilArg0 || op.faultOnNilArg1 {
		// Prefer the position of an instruction which could fault.
		pos = v + ".Pos"
	}

	// If the last argument is ___, it means "don't care about trailing arguments, really"