n += a &^ (1 << 0)

	return n
}

func bitcompl32(a, b uint32) (n uint32) {
	// amd64:"BTCL"
	n += b ^ (1 << (a & 31))

	// amd64:"XORL\t[$]-2147483648"
	n += a ^ (1 << 31)

	// amd64:"XORL\t[$]268435456"
	n += a ^ (1 << 28)

	// amd64:"XORL\t[$]1"
	n += a ^ (1 << 0)

	return n
}

// check direct operation on memory with constant and shifted constant sources

#endif

#ifdef NEED_EXT_FEATURES_CX
	MOVL	$0x80000001, AX
	CPUID
	ANDL	$NEED_EXT_FEATURES_CX, CX
	CMPL	CX, $NEED_EXT_FEATURES_CX
	JNE	bad_cpu
#endif

#ifdef NEED_OS_SUPPORT_AX
	XORL    CX, CX
	XGETBV
	ANDL	$NEED_OS_SUPPORT_AX, AX
	CMPL	AX, $NEED_OS_SUPPORT_AX
	JNE	bad_cpu
#endif

#ifdef NEED_DARWIN_SUPPORT
	MOVQ	$commpage64_version, BX

		reg: regInfo{
			inputs: []inputInfo{
				{0, 239}, // AX CX DX BX BP SI DI
			},
			outputs: []outputInfo{
				{0, 239}, // AX CX DX BX BP SI DI
			},
		},
	},
	{
		name:         "XORL",
		argLen:       2,
		commutative:  true,
		resultInArg0: true,
		clobberFlags: true,
		asm:          x86.AXORL,
		reg: regInfo{
			inputs: []inputInfo{
				{0, 239}, // AX CX DX BX BP SI DI