return x<<7 ^ x2>>57 // arm64:"EXTR\t[$]57,"
}

func extr4(x, x2 uint32) uint32 {
	return x<<7 + x2>>25 // arm64:"EXTRW\t[$]25,"
}

func extr5(x, x2 uint32) uint32 {
	return x<<7 | x2>>25 // arm64:"EXTRW\t[$]25,"
}

func extr6(x, x2 uint32) uint32 {
	return x<<7 ^ x2>>25 // arm64:"EXTRW\t[$]25,"
}

// check 32-bit shift masking
func mask32(x uint32) uint32 {

	"CSINVW",
	"CSNEG",
	"CSNEGW",
	"DC",
	"DCPS1",
	"DCPS2",
	"DCPS3",
	"DMB",
	"DRPS",
	"DSB",
	"DWORD",
	"EON",
	"EONW",
	"EOR",
	"EORW",
	"ERET",
	"EXTR",
	"EXTRW",
	"FABSD",
	"FABSS",
	"FADDD",
	"FADDS",
	"FCCMPD",
	"FCCMPED",
	"FCCMPES",
	"FCCMPS",
	"FCMPD",
	"FCMPED",
	"FCMPES",
	"FCMPS",
	"FCSELD",
	"FCSELS",
	"FCVTDH",

	// arm64:"CLZW",-"MOVWU"
	ret += uint64(bits.LeadingZeros32(t1))

	// arm64:"REV16W",-"MOVWU"
	ret += uint64(((t1 & 0xff00ff00) >> 8) | ((t1 & 0x00ff00ff) << 8))

	// arm64:"EXTRW",-"MOVWU"
	ret += uint64((t1 << 25) | (t2 >> 7))

	return ret
}

// no sign extension when the upper bits of the result are zero

func noSignEXT(x int) int64 {
	t1 := int32(x)

	var ret int64

	EOR $-2287828610704211969, R27, R22        // 76e343d2
	EORW R12->27, R10, R19                     // 536d8c4a
	EOR R2<<59, R30, R17                       // d1ef02ca
	ERET                                       // e0039fd6
	EXTRW $7, R8, R10, R25                     // 591d8813
	EXTR $35, R22, R12, R8                     // 888dd693
	SEVL                                       // bf2003d5
	HINT $6                                    // df2003d5

		{name: "EXTRconst", argLength: 2, reg: gp21, asm: "EXTR", aux: "Int64"},   // extract 64 bits from arg0:arg1 starting at lsb auxInt, auxInt should be in the range 0 to 63.
		{name: "EXTRWconst", argLength: 2, reg: gp21, asm: "EXTRW", aux: "Int64"}, // extract 32 bits from arg0[31:0]:arg1[31:0] starting at lsb auxInt and zero top 32 bits, auxInt should be in the range 0 to 31.

		// comparisons