"MMULS",
	"WORD",
	"MULL",
	"MULAL",
	"MULLU",
	"MULALU",
	"BX",
	"BXRET",
	"DWORD",
	"LDREX",
	"STREX",
	"LDREXD",
	"STREXD",
	"DMB",
	"PLD",
	"CLZ",
	"REV",
	"REV16",
	"REVSH",
	"RBIT",
	"XTAB",
	"XTAH",
	"XTABU",
	"XTAHU",
	"BFX",
	"BFXU",
	"BFC",
	"BFI",
	"MULWT",
	"MULWB",
	"MULBB",
	"MULAWT",
	"MULAWB",
	"MULABB",

	"NEGW",
	"NGC",
	"NGCS",
	"NGCSW",
	"NGCW",
	"NOOP",
	"ORN",
	"ORNW",
	"ORR",
	"ORRW",
	"PRFM",
	"PRFUM",
	"RBIT",
	"RBITW",
	"REM",
	"REMW",
	"REV",
	"REV16",
	"REV16W",
	"REV32",
	"REVW",
	"ROR",
	"RORW",
	"SBC",
	"SBCS",
	"SBCSW",
	"SBCW",
	"SBFIZ",
	"SBFIZW",
	"SBFM",
	"SBFMW",
	"SBFX",
	"SBFXW",
	"SCVTFD",

//
//go:nosplit
func shift_no_cmp(x int) int {
	// arm64:`LSL\t[$]17`,-`CMP`
	// mips64:`SLLV\t[$]17`,-`SGT`
	return x << 17
}

func rev16(c uint64) (uint64, uint64, uint64) {
	// arm64:`REV16`,-`AND`,-`LSR`,-`AND`,-`ORR\tR[0-9]+<<8`
	b1 := ((c & 0xff00ff00ff00ff00) >> 8) | ((c & 0x00ff00ff00ff00ff) << 8)
	// arm64:-`ADD\tR[0-9]+<<8`

	// ppc64x/power10: "BRW"
	return bits.ReverseBytes32(n)
}

func ReverseBytes16(n uint16) uint16 {
	// amd64:"ROLW"
	// arm64:"REV16W",-"UBFX",-"ORR"
	// arm/5:"SLL","SRL","ORR"
	// arm/6:"REV16"
	// arm/7:"REV16"
	// ppc64x/power10: "BRH"
	return bits.ReverseBytes16(n)
}

// --------------------- //
//    bits.RotateLeft    //
// --------------------- //

func RotateLeft64(n uint64) uint64 {

	REV_ZZ:            "REV.ZZ",
	REV16_EQ:          "REV16.EQ",
	REV16_NE:          "REV16.NE",
	REV16_CS:          "REV16.CS",
	REV16_CC:          "REV16.CC",
	REV16_MI:          "REV16.MI",
	REV16_PL:          "REV16.PL",
	REV16_VS:          "REV16.VS",
	REV16_VC:          "REV16.VC",
	REV16_HI:          "REV16.HI",
	REV16_LS:          "REV16.LS",
	REV16_GE:          "REV16.GE",
	REV16_LT:          "REV16.LT",

	{0xfffffc00, 0x5ac00800, REV, instArgs{arg_Wd, arg_Wn}, nil},
	// REV <Xd>, <Xn>
	{0xfffffc00, 0xdac00c00, REV, instArgs{arg_Xd, arg_Xn}, nil},
	// REV16 <Wd>, <Wn>
	{0xfffffc00, 0x5ac00400, REV16, instArgs{arg_Wd, arg_Wn}, nil},
	// REV16 <Xd>, <Xn>
	{0xfffffc00, 0xdac00400, REV16, instArgs{arg_Xd, arg_Xn}, nil},
	// REV32 <Xd>, <Xn>
	{0xfffffc00, 0xdac00800, REV32, instArgs{arg_Xd, arg_Xn}, nil},
	// ROR <Wd>, <Wn>, <Wm>

		{name: "CLZ", argLength: 1, reg: gp11, asm: "CLZ"},     // count leading zero
		{name: "REV", argLength: 1, reg: gp11, asm: "REV"},     // reverse byte order
		{name: "REV16", argLength: 1, reg: gp11, asm: "REV16"}, // reverse byte order in 16-bit halfwords
		{name: "RBIT", argLength: 1, reg: gp11, asm: "RBIT"},   // reverse bit order

		// shifts

// ((x>>8) | (x<<8)) -> (REV16 x), the type of x is uint16, "|" can also be "^" or "+".
// UBFX instruction is supported by ARMv6T2, ARMv7 and above versions, REV16 is supported by
// ARMv6 and above versions. So for ARMv6, we need to match SLLconst, SRLconst and ORshiftLL.
((ADDshiftLL|ORshiftLL|XORshiftLL) <typ.UInt16> [8] (BFXU <typ.UInt16> [int32(armBFAuxInt(8, 8))] x) x) => (REV16 x)

		{name: "REVW", argLength: 1, reg: gp11, asm: "REVW"},                                  // byte reverse, 32-bit
		{name: "REV16", argLength: 1, reg: gp11, asm: "REV16"},                                // byte reverse in each 16-bit halfword, 64-bit
		{name: "REV16W", argLength: 1, reg: gp11, asm: "REV16W"},                              // byte reverse in each 16-bit halfword, 32-bit

	RET                                        // c0035fd6
	REVW R8, R10                               // 0a09c05a
	REV R1, R2                                 // 220cc0da
	REV16W R21, R19                            // b306c05a
	REV16 R25, R4                              // 2407c0da
	REV32 R27, R21                             // 750bc0da
	EXTRW $27, R4, R25, R19                    // 336f8413
	EXTR $17, R10, R29, R15                    // af47ca93