CMP R3, R4                      // 7c232000
	CMP R3, R0                      // 7c230000
	CMP R3, R0, CR1                 // CMP R3,CR1,R0   // 7ca30000
	CMPU R3, R4                     // 7c232040
	CMPU R3, R0                     // 7c230040
	CMPU R3, R0, CR2                // CMPU R3,CR2,R0  // 7d230040
	CMPW R3, R4                     // 7c032000
	CMPW R3, R0                     // 7c030000

			// guard against underflow.
			//
			//	CMPU	SP, $(framesize-StackSmall)
			//	BLT	label-of-call-to-morestack
			if offset <= 0xffff {
				p = obj.Appendp(p, c.newprog)
				p.As = ACMPU
				p.From.Type = obj.TYPE_REG
				p.From.Reg = REGSP
				p.To.Type = obj.TYPE_CONST
				p.To.Offset = offset
			} else {
				// Constant is too big for CMPU.
				p = obj.Appendp(p, c.newprog)
				p.As = AMOVD

TEXT ·xorBytes(SB), NOSPLIT, $0
	MOVD	dst+0(FP), R3	// R3 = dst
	MOVD	a+8(FP), R4	// R4 = a
	MOVD	b+16(FP), R5	// R5 = b
	MOVD	n+24(FP), R6	// R6 = n

	CMPU	R6, $64, CR7	// Check if n ≥ 64 bytes
	MOVD	R0, R8		// R8 = index
	CMPU	R6, $8, CR6	// Check if 8 ≤ n < 64 bytes
	BLE	CR6, small	// <= 8
	BLT	CR7, xor32	// Case for 32 ≤ n < 64 bytes

	// Case for n ≥ 64 bytes
preloop64:

(Neq(32|64)F x y) => (NotEqual (FCMPU x y))

(Less(8|16) x y)  => (LessThan (CMPW (SignExt(8|16)to32 x) (SignExt(8|16)to32 y)))
(Less(32|64) x y) => (LessThan ((CMPW|CMP) x y))
(Less(32|64)F x y) => (FLessThan (FCMPU x y))

(Less(8|16)U x y)  => (LessThan (CMPWU (ZeroExt(8|16)to32 x) (ZeroExt(8|16)to32 y)))
(Less(32|64)U x y) => (LessThan ((CMPWU|CMPU) x y))

#ifdef NEEDS_ESPERM
	MOVD	$·rcon(SB), R7
	LVX	(R7), ESPERM   // Permute value for P8_ macros.
#endif

	// Set CR{1,2,3}EQ to hold the key size information.
	CMPU	R6, $10, CR1
	CMPU	R6, $12, CR2
	CMPU	R6, $14, CR3

	MOVD	$16, R6
	MOVD	$32, R7
	MOVD	$48, R8
	MOVD	$64, R9
	MOVD	$80, R10
	MOVD	$96, R11
	MOVD	$112, R12

	// Load text in BE order
	P8_LXVB16X(R4, R0, V0)

}

// IsPPC64CMP reports whether the op (as defined by an ppc64.A* constant) is
// one of the CMP instructions that require special handling.
func IsPPC64CMP(op obj.As) bool {
	switch op {
	case ppc64.ACMP, ppc64.ACMPU, ppc64.ACMPW, ppc64.ACMPWU, ppc64.AFCMPO, ppc64.AFCMPU:
		return true
	}
	return false
}

// IsPPC64NEG reports whether the op (as defined by an ppc64.A* constant) is

		{name: "FMOVSconst", argLength: 0, reg: fp01, aux: "Float32", asm: "FMOVS", rematerializeable: true},           //
		{name: "FCMPU", argLength: 2, reg: fp2cr, asm: "FCMPU", typ: "Flags"},

		{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

		v0.AuxInt = int64ToAuxInt(c)
		v0.AddArg(y)
		v.AddArg(v0)
		return true
	}
	// match: (CMPU x y)
	// cond: canonLessThan(x,y)
	// result: (InvertFlags (CMPU y x))
	for {
		x := v_0
		y := v_1
		if !(canonLessThan(x, y)) {
			break
		}
		v.reset(OpPPC64InvertFlags)
		v0 := b.NewValue0(v.Pos, OpPPC64CMPU, types.TypeFlags)
		v0.AddArg2(y, x)

	VSLDOI	$8,zeroes,V8,V8  // or: VSLDOI V29,V8,V27,4 for top 32 bits?
#else
	VSLDOI	$4,V8,zeroes,V8
#endif

#ifdef BYTESWAP_DATA
	MOVD    $·byteswapcons(SB),R3
	LVX	(R3),byteswap
#endif

	CMPU	R5,$256		// length of bytes
	BLT	short

	RLDICR	$0,R5,$56,R6 // chunk to process

	// First step for larger sizes
l1:	MOVD	$32768,R7
	MOVD	R7,R9
	CMP	R6,R7   // compare R6, R7 (MAX SIZE)

	{as: ACMP, a1: C_REG, a6: C_S16CON, type_: 70, size: 4},
	{as: ACMP, a1: C_REG, a2: C_CREG, a6: C_S16CON, type_: 70, size: 4},
	{as: ACMPU, a1: C_REG, a6: C_REG, type_: 70, size: 4},
	{as: ACMPU, a1: C_REG, a2: C_CREG, a6: C_REG, type_: 70, size: 4},
	{as: ACMPU, a1: C_REG, a6: C_U16CON, type_: 70, size: 4},
	{as: ACMPU, a1: C_REG, a2: C_CREG, a6: C_U16CON, type_: 70, size: 4},
	{as: AFCMPO, a1: C_FREG, a6: C_FREG, type_: 70, size: 4},