BLT	tail_4
	MOVD	(R3), R12
	CMPB	R12, R5, R12
	POPCNTD	R12, R12
	ADD	R12, R18, R18
	ADD	$8, R3, R3
	ADD	$-8, R4, R4

tail_4:	// Count the remaining 0 - 7 bytes.
	CMP	R4, $4
	BLT	tail_2
	MOVWZ	(R3), R12
	CMPB	R12, R5, R12
	SLD	$32, R12, R12	// Remove non-participating matches.
	POPCNTD	R12, R12
	ADD	R12, R18, R18
	ADD	$4, R3, R3
	ADD	$-4, R4, R4

tail_2:	// Count the remaining 0 - 3 bytes.

	RLL	$16, R1, R2
	ANDW	$0x7FF0, R2
	MOVW	R2, R6
	MOVW	R3, R7
	CMPUBLE	R6, R7, L6
	MOVD	$·atanxmone<>+0(SB), R3
	FMOVD	0(R3), F2
	WFDDB	V0, V2, V0
	RISBGZ	$63, $63, $33, R1, R1
	MOVD	$·atanxpi2h<>+0(SB), R3
	MOVWZ	R1, R1
	SLD	$3, R1, R1
	WORD	$0x68813000	//ld	%f8,0(%r1,%r3)
L6:
	WFMDB	V0, V0, V2
	FMOVD	152(R5), F6
	FMOVD	144(R5), F1
	FMOVD	136(R5), F7
	VLEG	$0, 128(R5), V16
	FMOVD	120(R5), F4
	FMOVD	112(R5), F5

	"EXTSW",
	"EXTSWCC",
	"FCFID",
	"FCFIDCC",
	"FCFIDU",
	"FCFIDUCC",
	"FCFIDS",
	"FCFIDSCC",
	"FCTID",
	"FCTIDCC",
	"FCTIDZ",
	"FCTIDZCC",
	"LDAR",
	"MOVD",
	"MOVDU",
	"MOVWZ",
	"MOVWZU",
	"MULHD",
	"MULHDCC",
	"MULHDU",
	"MULHDUCC",
	"MULLD",
	"MULLDCC",
	"MULLDVCC",
	"MULLDV",
	"RFID",
	"RLDMI",
	"RLDMICC",
	"RLDIMI",
	"RLDIMICC",
	"RLDC",

	"MULLD",
	"MULHD",
	"MULHDU",
	"MLGR",
	"SUB",
	"SUBC",
	"SUBV",
	"SUBE",
	"SUBW",
	"NEG",
	"NEGW",
	"MOVWBR",
	"MOVB",
	"MOVBZ",
	"MOVH",
	"MOVHBR",
	"MOVHZ",
	"MOVW",
	"MOVWZ",
	"MOVD",
	"MOVDBR",
	"MOVDEQ",
	"MOVDGE",
	"MOVDGT",
	"MOVDLE",
	"MOVDLT",
	"MOVDNE",
	"LOCR",
	"LOCGR",
	"FLOGR",
	"POPCNT",
	"AND",
	"ANDW",
	"OR",
	"ORW",
	"XOR",

	MOVD	(R12), R8;			\
	PCDATA  $PCDATA_StackMapIndex, $0;	\
	BL	(R8);				\
	/* copy return values back */		\
	MOVD	stackArgsType+0(FP), R7;		\
	MOVD	stackArgs+16(FP), R6;			\
	MOVWZ	stackArgsSize+24(FP), R5;			\
	MOVD	$stack-MAXSIZE(SP), R4;		\
	MOVWZ	stackRetOffset+28(FP), R1;		\
	ADD	R1, R4;				\
	ADD	R1, R6;				\
	SUB	R1, R5;				\
	BL	callRet<>(SB);			\
	RET

	// 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`
	// ppc64x:-`CMPW\t`

TEXT	·log1pAsm(SB), NOSPLIT, $0-16
	FMOVD	x+0(FP), F0
	MOVD	$·log1pxmone<>+0(SB), R1
	MOVD	·log1pxout<>+0(SB), R2
	FMOVD	0(R1), F3
	MOVD	$·log1pxa<>+0(SB), R1
	MOVWZ	·log1pxlim<>+0(SB), R0
	FMOVD	0(R1), F1
	MOVD	$·log1pc8<>+0(SB), R1
	FMOVD	0(R1), F5
	MOVD	$·log1pc7<>+0(SB), R1
	VLEG	$0, 0(R1), V20
	MOVD	$·log1pc6<>+0(SB), R1
	WFSDB	V0, V3, V4
	VLEG	$0, 0(R1), V18

checkbytes:
	BC	12, 14, LR		// BEQ lr
#ifdef GOPPC64_power10
	SLD	$56, BYTES, TMP
	LXVL	SRC, TMP, V0
	STXVL	V0, TGT, TMP
	RET
#endif
lt8:	// Move word if possible
	CMP BYTES, $4
	BLT lt4
	MOVWZ 0(SRC), TMP
	ADD $-4, BYTES
	MOVW TMP, 0(TGT)
	ADD $4, SRC
	ADD $4, TGT
lt4:	// Move halfword if possible
	CMP BYTES, $2
	BLT lt2
	MOVHZ 0(SRC), TMP
	ADD $-2, BYTES
	MOVH TMP, 0(TGT)

	io64[2] = (io64[2] >> 4) & 0x0000FFFFFFFFFFFF
	// ppc64x: -"SRD", -"AND", "RLDICL\t[$]36, R[0-9]*, [$]28, R"
	io64[3] = (io64[3] >> 28) & 0x0000FFFFFFFFFFFF

	// ppc64x: "MOVWZ", "RLWNM\t[$]1, R[0-9]*, [$]28, [$]3, R"
	io64[4] = uint64(bits.RotateLeft32(io32[0], 1) & 0xF000000F)

	// ppc64x: "RLWNM\t[$]0, R[0-9]*, [$]4, [$]19, R"
	io32[0] = io32[0] & 0x0FFFF000

		{name: "MOVWreg", argLength: 1, reg: gp11sp, asm: "MOVW", typ: "Int64"},    // sign extend arg0 from int32 to int64
		{name: "MOVWZreg", argLength: 1, reg: gp11sp, asm: "MOVWZ", typ: "UInt64"}, // zero extend arg0 from int32 to int64

		{name: "MOVDconst", reg: gp01, asm: "MOVD", typ: "UInt64", aux: "Int64", rematerializeable: true}, // auxint