// SXTB <Xd>, <Wn>
	{0xfffffc00, 0x93401c00, SXTB, instArgs{arg_Xd, arg_Wn}, nil},
	// SXTH <Xd>, <Wn>
	{0xfffffc00, 0x93403c00, SXTH, instArgs{arg_Xd, arg_Wn}, nil},
	// SXTW <Xd>, <Wn>
	{0xfffffc00, 0x93407c00, SXTW, instArgs{arg_Xd, arg_Wn}, nil},
	// SBFM <Xd>, <Xn>, #<immr>, #<imms>

        '\ufdf0foo'      | _
        'foo\u0300'      | _
        'foo\u203f'      | _
    }

    def "identifies illegal character"() {
        expect:
        //	Char	   ::=   	#x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]
        //	/* any Unicode character, excluding the surrogate blocks, FFFE, and FFFF. */
        !XmlValidation.isLegalCharacter(character)

        where:

		x8 := byteorder.LeUint32(q[4*0x8:])
		x9 := byteorder.LeUint32(q[4*0x9:])
		xa := byteorder.LeUint32(q[4*0xa:])
		xb := byteorder.LeUint32(q[4*0xb:])
		xc := byteorder.LeUint32(q[4*0xc:])
		xd := byteorder.LeUint32(q[4*0xd:])
		xe := byteorder.LeUint32(q[4*0xe:])
		xf := byteorder.LeUint32(q[4*0xf:])

		// round 1
		a = b + bits.RotateLeft32((((c^d)&b)^d)+a+x0+0xd76aa478, 7)

{"Name":"ADR","Bits":"0|immlo:2|1|0|0|0|0|immhi:19|Rd:5","Arch":"Literal variant","Syntax":"ADR <Xd>, <label>","Code":"","Alias":""},
{"Name":"ADRP","Bits":"1|immlo:2|1|0|0|0|0|immhi:19|Rd:5","Arch":"Literal variant","Syntax":"ADRP <Xd>, <label>","Code":"","Alias":""},

	}

	n2 := n >> 1
	x1, x0 := x[n2:], x[0:n2]

	karatsubaSqr(z, x0)
	karatsubaSqr(z[n:], x1)

	// s = sign(xd*yd) == -1 for xd != 0; s == 1 for xd == 0
	xd := z[2*n : 2*n+n2]
	if subVV(xd, x1, x0) != 0 {
		subVV(xd, x0, x1)
	}

	p := z[n*3:]
	karatsubaSqr(p, xd)

	r := z[n*4:]
	copy(r, z[:n*2])

	karatsubaAdd(z[n2:], r, n)
	karatsubaAdd(z[n2:], r[n:], n)

   * (NCR). However, horizontal tab {@code '\t'}, line feed {@code '\n'} and carriage return {@code
   * '\r'} are escaped to a corresponding NCR {@code "	"}, {@code "
"}, and {@code "
"}
   * respectively. Any other non-ASCII characters appearing in the input will be preserved in the
   * output.
   *
   * <p>This escaper does not treat surrogate pairs specially and does not perform Unicode

   * (NCR). However, horizontal tab {@code '\t'}, line feed {@code '\n'} and carriage return {@code
   * '\r'} are escaped to a corresponding NCR {@code "	"}, {@code "
"}, and {@code "
"}
   * respectively. Any other non-ASCII characters appearing in the input will be preserved in the
   * output.
   *
   * <p>This escaper does not treat surrogate pairs specially and does not perform Unicode

    // Test all escapes
    assertEquals(
        "a&quot;b&lt;c&gt;d&amp;e&quot;f&apos;", xmlAttributeEscaper.escape("a\"b<c>d&e\"f'"));
    // Test '\t', '\n' and '\r' are escaped.
    assertEquals("a&#x9;b&#xA;c&#xD;d", xmlAttributeEscaper.escape("a\tb\nc\rd"));
  }

  // Helper to assert common properties of xml escapers.
  static void assertBasicXmlEscaper(

    // Test all escapes
    assertEquals(
        "a&quot;b&lt;c&gt;d&amp;e&quot;f&apos;", xmlAttributeEscaper.escape("a\"b<c>d&e\"f'"));
    // Test '\t', '\n' and '\r' are escaped.
    assertEquals("a&#x9;b&#xA;c&#xD;d", xmlAttributeEscaper.escape("a\tb\nc\rd"));
  }

  // Helper to assert common properties of xml escapers.
  static void assertBasicXmlEscaper(

		}
	}
	return n
}

// skipCSSSpace returns a suffix of c, skipping over a single space.
func skipCSSSpace(c []byte) []byte {
	if len(c) == 0 {
		return c
	}
	// wc ::= #x9 | #xA | #xC | #xD | #x20
	switch c[0] {
	case '\t', '\n', '\f', ' ':
		return c[1:]
	case '\r':
		// This differs from CSS3's wc production because it contains a
		// probable spec error whereby wc contains all the single byte