VLEIG	$1, $32767, V31         // e7f07fff1842
	VSLDB	$3, V1, V16, V18        // e72100030a77
	VERIMB	$2, V31, V1, V2         // e72f10020472
	VSEL	V1, V2, V3, V4          // e7412000308d
	VGFMAH	V21, V31, V24, V0       // e705f10087bc
	VFMADB	V16, V8, V9, V10        // e7a08300948f
	WFMADB	V17, V18, V19, V20      // e74123083f8f
	VFMSDB	V2, V25, V24, V31       // e7f293008b8e

	VCMEQ V24.S4, V13.S4, V12.S4                                // ac8db86e
	VCNT V13.B8, V11.B8                                         // ab59200e
	VMOV V31.B[15], V18                                         // f2071f5e
	VDUP V31.B[15], V18                                         // f2071f5e
	VDUP V31.B[13], V20.B16                                     // f4071b4e
	VEOR V4.B8, V18.B8, V7.B8                                   // 471e242e

	{"V20", "V20"},
	{"V21", "V21"},
	{"V22", "V22"},
	{"V23", "V23"},
	{"V24", "V24"},
	{"V25", "V25"},
	{"V26", "V26"},
	{"V27", "V27"},
	{"V28", "V28"},
	{"V29", "V29"},
	{"V30", "V30"},
	{"V31", "V31"},
	{"F14", "F14"},
	{"F15", "F15"},
	{"F16", "F16"},
	{"F17", "F17"},
	{"F18", "F18"},
	{"F19", "F19"},
	{"F20", "F20"},
	{"F21", "F21"},
	{"F22", "F22"},
	{"F23", "F23"},

func ARM64RegisterArrangement(reg int16, name, arng string) (int64, error) {
	var curQ, curSize uint16
	if name[0] != 'V' {
		return 0, errors.New("expect V0 through V31; found: " + name)
	}
	if reg < 0 {
		return 0, errors.New("invalid register number: " + name)
	}
	switch arng {
	case "B8":
		curSize = 0
		curQ = 0
	case "B16":
		curSize = 0
		curQ = 1

// registers in []. There may be comma-separated ranges or individual
// registers, as in [R1,R3-R5] or [V1.S4, V2.S4, V3.S4, V4.S4].
// For ARM, only R0 through R15 may appear.
// For ARM64, V0 through V31 with arrangement may appear.
//
// For 386/AMD64 register list specifies 4VNNIW-style multi-source operand.
// For range of 4 elements, Intel manual uses "+3" notation, for example:
//

	VMOVQ		V7.BU[0], R4    // e480f372
	VMOVQ		V7.BU[1], R4    // e484f372
	VMOVQ		V9.BU[3], R5    // 258df372
	VMOVQ		V10.HU[2], R6   // 46c9f372
	VMOVQ		V11.WU[2], R7   // 67e9f372
	VMOVQ		V31.VU[1], R8   // e8f7f372
	XVMOVQ		X1.W[2], R7     // 27c8ef76
	XVMOVQ		X6.V[2], R8     // c8e8ef76
	XVMOVQ		X8.WU[2], R7    // 07c9f376
	XVMOVQ		X31.VU[2], R8   // e8ebf376