TESTL R11, R11                          // 4585db
	TESTQ $-249346713, (BX)                 // 48f703674523f1
	TESTQ $-249346713, (R11)                // 49f703674523f1
	TESTQ $-249346713, DX                   // 48f7c2674523f1
	TESTQ $-249346713, R11                  // 49f7c3674523f1
	TESTQ DX, (BX)                          // 488513
	TESTQ R11, (BX)                         // 4c851b
	TESTQ DX, (R11)                         // 498513

		// TESTx: compare (arg0 & arg1) to 0
		{name: "TESTQ", argLength: 2, reg: gp2flags, commutative: true, asm: "TESTQ", typ: "Flags"},
		{name: "TESTL", argLength: 2, reg: gp2flags, commutative: true, asm: "TESTL", typ: "Flags"},

//		}
//		// Use addr.
//		...
//	}
//
// nosplit because it is used during write barriers and must not be preempted.
//
//go:nosplit
func (tp typePointers) nextFast() (typePointers, uintptr) {
	// TESTQ/JEQ
	if tp.mask == 0 {
		return tp, 0
	}
	// BSFQ
	var i int
	if goarch.PtrSize == 8 {
		i = sys.TrailingZeros64(uint64(tp.mask))
	} else {
		i = sys.TrailingZeros32(uint32(tp.mask))
	}

		asm:            x86.ABTCQ,
		reg: regInfo{
			inputs: []inputInfo{
				{0, 4295032831}, // AX CX DX BX SP BP SI DI R8 R9 R10 R11 R12 R13 g R15 SB
			},
		},
	},
	{
		name:        "TESTQ",
		argLen:      2,
		commutative: true,
		asm:         x86.ATESTQ,
		reg: regInfo{
			inputs: []inputInfo{
				{0, 49151}, // AX CX DX BX SP BP SI DI R8 R9 R10 R11 R12 R13 R15