private static String printHexBinary(byte[] data) {
        StringBuilder r = new StringBuilder(data.length * 2);
        for (byte b : data) {
            r.append(hexCode[(b >> 4) & 0xF]);
            r.append(hexCode[(b & 0xF)]);
        }
        return r.toString();
    }

// paddedGHASH pads data with zeroes until its length is a multiple of
// 16-bytes. It then calculates a new value for hash using the GHASH algorithm.
func (g *gcmAsm) paddedGHASH(hash *[16]byte, data []byte) {
	siz := len(data) &^ 0xf // align size to 16-bytes
	if siz > 0 {
		ghash(&g.hashKey, hash, data[:siz])
		data = data[siz:]
	}
	if len(data) > 0 {
		var s [16]byte
		copy(s[:], data)
		ghash(&g.hashKey, hash, s[:])
	}
}

		for j := 0; j < 64; j += 4 {
			msw := z.high & 0xf
			z.high >>= 4
			z.high |= z.low << 60
			z.low >>= 4
			z.low ^= uint64(gcmReductionTable[msw]) << 48

			// the values in |table| are ordered for
			// little-endian bit positions. See the comment
			// in NewGCMWithNonceSize.
			t := &g.productTable[word&0xf]

			z.low ^= t.low
			z.high ^= t.high
			word >>= 4
		}
	}

	}
	if x >= 0x100 {
		b = append(b, digits[x>>8&0xf])
	}
	if x >= 0x10 {
		b = append(b, digits[x>>4&0xf])
	}
	return append(b, digits[x&0xf])
}

// appendHexPad appends the fully padded hex string representation of x to b.
func appendHexPad(b []byte, x uint16) []byte {
	return append(b, digits[x>>12], digits[x>>8&0xf], digits[x>>4&0xf], digits[x&0xf])
}

func (ip Addr) string4() string {

	PTRACE_GETFPREGS                 = 0xe
	PTRACE_GETFPXREGS                = 0x12
	PTRACE_GET_THREAD_AREA           = 0x19
	PTRACE_OLDSETOPTIONS             = 0x15
	PTRACE_SETFPREGS                 = 0xf
	PTRACE_SETFPXREGS                = 0x13
	PTRACE_SET_THREAD_AREA           = 0x1a
	PTRACE_SINGLEBLOCK               = 0x21
	PTRACE_SYSEMU                    = 0x1f
	PTRACE_SYSEMU_SINGLESTEP         = 0x20

	PTRACE_GETFPREGS                 = 0xe
	PTRACE_GETFPXREGS                = 0x12
	PTRACE_GET_THREAD_AREA           = 0x19
	PTRACE_OLDSETOPTIONS             = 0x15
	PTRACE_SETFPREGS                 = 0xf
	PTRACE_SETFPXREGS                = 0x13
	PTRACE_SET_THREAD_AREA           = 0x1a
	PTRACE_SINGLEBLOCK               = 0x21
	PTRACE_SYSEMU                    = 0x1f
	PTRACE_SYSEMU_SINGLESTEP         = 0x20

                    case '\r':
                        out.write('\\');
                        out.write('r');
                        break;
                    default:
                        if (ch > 0xf) {
                            out.write("\\u00" + hex(ch));
                        } else {
                            out.write("\\u000" + hex(ch));
                        }
                        break;

		d := dylibId(r.targ)
		if d > 0 && d < 128 {
			bind.AddUint8(BIND_OPCODE_SET_DYLIB_ORDINAL_IMM | uint8(d)&0xf)
		} else if d >= 128 {
			bind.AddUint8(BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB)
			bind.AddUleb(uint64(d))
		} else { // d <= 0
			bind.AddUint8(BIND_OPCODE_SET_DYLIB_SPECIAL_IMM | uint8(d)&0xf)
		}

		bind.AddUint8(BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM)

            assert decoder.readInt() == value
        }

        where:
        value             | _
        0                 | _
        12                | _
        -1                | _
        0xF               | _
        0xFD              | _
        0xFDD             | _
        0xFFDD            | _
        0xFFDDCC          | _
        0x7FDDCCBB        | _
        -0xFF             | _

	g := 2 * uint64(uint32(d))
	return f, g
}

func checkCombinedShifts(v8 uint8, v16 uint16, v32 uint32, x32 int32, v64 uint64) (uint8, uint16, uint32, uint64, int64) {

	// ppc64x:-"AND","CLRLSLWI"
	f := (v8 & 0xF) << 2
	// ppc64x:"CLRLSLWI"
	f += byte(v16) << 3
	// ppc64x:-"AND","CLRLSLWI"
	g := (v16 & 0xFF) << 3
	// ppc64x:-"AND","CLRLSLWI"
	h := (v32 & 0xFFFFF) << 2
	// ppc64x:"CLRLSLDI"