VPGATHERQQ Y2, (BP)(Y7*2), Y1           // c4e2ed914c7d00
	VPGATHERQQ X12, (R13)(X14*2), X11       // c40299915c7500
	VPGATHERQQ Y12, (R13)(Y14*2), Y11       // c4029d915c7500
	VPGATHERQQ X2, (BP)(X7*2), X1           // c4e2e9914c7d00
	VPGATHERQQ Y2, (BP)(Y7*2), Y1           // c4e2ed914c7d00
	VPGATHERQQ X12, (R13)(X14*2), X11       // c40299915c7500
	VPGATHERQQ Y12, (R13)(Y14*2), Y11       // c4029d915c7500

	CSINV	HS, R1, R2, R3	// 232082da
	CSINVW	MI, R2, ZR, R2	// 42409f5a
	CINC	EQ, R4, R9	// 8914849a
	CINCW	PL, R2, ZR	// 5f44821a
	CINV	PL, R11, R22	// 76418bda
	CINVW	LS, R7, R13	// ed80875a
	CNEG	LS, R13, R7	// a7858dda
	CNEGW	EQ, R8, R13	// 0d15885a

// atomic ops
	LDARB	(R25), R2                            // 22ffdf08
	LDARH	(R5), R7                             // a7fcdf48

)

// Reads from a reader and rot13s the result.
type rot13Reader struct {
	r io.Reader
}

func newRot13Reader(r io.Reader) *rot13Reader {
	r13 := new(rot13Reader)
	r13.r = r
	return r13
}

func (r13 *rot13Reader) Read(p []byte) (int, error) {
	n, err := r13.r.Read(p)
	for i := 0; i < n; i++ {
		c := p[i] | 0x20 // lowercase byte
		if 'a' <= c && c <= 'm' {
			p[i] += 13
		} else if 'n' <= c && c <= 'z' {