"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 {

		{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

	&& (uint64(c1) == 0xff00ff00ff00ff00 && uint64(c2) == 0x00ff00ff00ff00ff)
	=> (REV16 x)

// ((x & 0xff00ff00)>>8) | ((x & 0x00ff00ff)<<8), "|" can also be "^" or "+".
((ADDshiftLL|ORshiftLL|XORshiftLL) [8] (SRLconst [8] (ANDconst [c1] x)) (ANDconst [c2] x))
	&& (uint64(c1) == 0xff00ff00 && uint64(c2) == 0x00ff00ff)
	=> (REV16 (ANDconst <x.Type> [0xffffffff] x))

// Extract from reg pair

	MMUL	R1, R2, R3           // 12f153e7
	MULBB	R1, R2, R3           // 820163e1
	MULWB	R1, R2, R3           // a20123e1
	MULWT	R1, R2, R3           // e20123e1

// REV
	REV	R1, R2               // 312fbfe6
	REV16	R1, R2               // b12fbfe6
	REVSH	R1, R2               // b12fffe6
	RBIT	R1, R2               // 312fffe6

// XTAB/XTAH/XTABU/XTAHU
	XTAB	R2@>0, R8            // 7280a8e6

		v.reset(OpARMADDconst)
		v.AuxInt = int32ToAuxInt(c << uint64(d))
		v.AddArg(x)
		return true
	}
	// match: (ADDshiftLL <typ.UInt16> [8] (BFXU <typ.UInt16> [int32(armBFAuxInt(8, 8))] x) x)
	// result: (REV16 x)
	for {
		if v.Type != typ.UInt16 || auxIntToInt32(v.AuxInt) != 8 || v_0.Op != OpARMBFXU || v_0.Type != typ.UInt16 || auxIntToInt32(v_0.AuxInt) != int32(armBFAuxInt(8, 8)) {
			break
		}
		x := v_0.Args[0]