// s390x:`MOVHBR\t\(.*\), [R]`,`CMPW\t.*, [$]`
	return s == "xx"
}

func CompareString2(s string) bool {
	// amd64:`CMPL\t\(.*\), [$]`
	// arm64:`MOVWU\t\(.*\), [R]`,`CMPW\t.*, [R]`
	// ppc64le:`MOVWZ\t\(.*\), [R]`,`CMPW\t.*, [R]`
	// s390x:`MOVWBR\t\(.*\), [R]`,`CMPW\t.*, [$]`
	return s == "xxxx"
}

func CompareString3(s string) bool {
	// amd64:`CMPQ\t\(.*\), [A-Z]`
	// arm64:-`CMPW\t`

	CMP	R1, R2                 // b9200012
	CMP	R3, $32767             // a73f7fff
	CMP	R3, $32768             // c23c00008000
	CMP	R3, $-2147483648       // c23c80000000
	CMPU	R4, R5                 // b9210045
	CMPU	R6, $4294967295        // c26effffffff
	CMPW	R7, R8                 // 1978
	CMPW	R9, $-32768            // a79e8000
	CMPW	R9, $-32769            // c29dffff7fff

	// compared to ARM64 and others.
	CMP	$0, R9
	BEQ	sigtrampnog // g == nil

	// g is not nil. Check further.
	MOVD	g_m(R9), R6
	CMP	$0, R6
	BEQ	sigtramp    // g.m == nil
	MOVW	m_ncgo(R6), R7
	CMPW	$0, R7
	BEQ	sigtramp    // g.m.ncgo = 0
	MOVD	m_curg(R6), R7
	CMP	$0, R7
	BEQ	sigtramp    // g.m.curg == nil
	MOVD	g_syscallsp(R7), R7
	CMP	$0, R7
	BEQ	sigtramp    // g.m.curg.syscallsp == 0

	CALL	libc_mmap(SB)
	MOVD	$0, R4
	CMP	R3, $-1
	BNE	noerr
	CALL	libc_errno(SB)
	MOVW	(R3), R4		// errno
	MOVD	$0, R3
noerr:
	MOVD	R3, 32(R14)
	MOVD	R4, 40(R14)
	RET

TEXT runtime·munmap_trampoline(SB),NOSPLIT,$32
	MOVD	8(R3), R4		// arg 2 - len
	MOVD	0(R3), R3		// arg 1 - addr
	CALL	libc_munmap(SB)
	CMP	R3, $-1
	BNE	3(PC)
	MOVD	$0, R3			// crash on failure

	MOVW	0(R0), R0	// arg 1 fd
	BL	libc_write(SB)
	MOVD	$-1, R1
	CMP	R0, R1
	BNE	noerr
	BL	libc_error(SB)
	MOVW	(R0), R0
	NEG	R0, R0		// caller expects negative errno value
noerr:
	RET

TEXT runtime·read_trampoline(SB),NOSPLIT,$0
	MOVD	8(R0), R1	// arg 2 buf
	MOVW	16(R0), R2	// arg 3 count
	MOVW	0(R0), R0	// arg 1 fd
	BL	libc_read(SB)
	MOVD	$-1, R1
	CMP	R0, R1
	BNE	noerr
	BL	libc_error(SB)
	MOVW	(R0), R0

var x32 [2]uint32
var x64 [2]uint64

func compMem1() int {
	// amd64:`CMPB\tcommand-line-arguments.x\+1\(SB\), [$]0`
	if x[1] {
		return 1
	}
	// amd64:`CMPB\tcommand-line-arguments.x8\+1\(SB\), [$]7`
	if x8[1] == 7 {
		return 1
	}
	// amd64:`CMPW\tcommand-line-arguments.x16\+2\(SB\), [$]7`
	if x16[1] == 7 {
		return 1
	}
	// amd64:`CMPL\tcommand-line-arguments.x32\+4\(SB\), [$]7`
	if x32[1] == 7 {
		return 1
	}

#ifdef NEEDS_ESPERM
	MOVD	$·rcon(SB), R11
	LVX	(R11), ESPERM   // Permute value for P8_ macros.
#endif

	// Assume len > 0 && len % blockSize == 0.
	CMPW	ENC, $0
	P8_LXVB16X(IVP, R0, IVEC)
	CMPU	ROUNDS, $10, CR1
	CMPU	ROUNDS, $12, CR2 // Only sizes 10/12/14 are supported.

	// Setup key in VSRs, and set loop count in CTR.
	LOAD_KEY(KEYP)
	SRD	$4, LEN
	MOVD	LEN, CTR

	BEQ	Lcbc_dec

		{name: "CMP", argLength: 2, reg: gp2cr, asm: "CMP", typ: "Flags"},     // arg0 compare to arg1
		{name: "CMPU", argLength: 2, reg: gp2cr, asm: "CMPU", typ: "Flags"},   // arg0 compare to arg1
		{name: "CMPW", argLength: 2, reg: gp2cr, asm: "CMPW", typ: "Flags"},   // arg0 compare to arg1
		{name: "CMPWU", argLength: 2, reg: gp2cr, asm: "CMPWU", typ: "Flags"}, // arg0 compare to arg1

}
func rewriteValueARM64latelower_OpARM64CMPWconst(v *Value) bool {
	v_0 := v.Args[0]
	b := v.Block
	typ := &b.Func.Config.Types
	// match: (CMPWconst [c] x)
	// cond: !isARM64addcon(int64(c))
	// result: (CMPW x (MOVDconst [int64(c)]))
	for {
		c := auxIntToInt32(v.AuxInt)
		x := v_0
		if !(!isARM64addcon(int64(c))) {
			break
		}
		v.reset(OpARM64CMPW)
		v0 := b.NewValue0(v.Pos, OpARM64MOVDconst, typ.UInt64)

	CMN R6, R3                                 // 7f0006ab
	CMNW R30, R5                               // bf001e2b
	CMNW $2, R5                                // bf080031
	CMN ZR, R3                                 // 7f001fab
	CMN R0, R3                                 // 7f0000ab
	CMPW R6.UXTB, R23                          // ff02266b
	CMP R25.SXTH<<2, R26                       // 5fab39eb
	CMP $3817, R29                             // bfa73bf1