C_SBRA
	C_LBRA

	C_HAUTO  /* halfword insn offset (-0xff to 0xff) */
	C_FAUTO  /* float insn offset (0 to 0x3fc, word aligned) */
	C_HFAUTO /* both H and F */
	C_SAUTO  /* -0xfff to 0xfff */
	C_LAUTO

	C_HOREG
	C_FOREG
	C_HFOREG
	C_SOREG
	C_ROREG
	C_SROREG /* both nil and R */
	C_LOREG

	C_PC
	C_SP
	C_HREG

	C_ADDR /* reference to relocatable address */

type huffmanNode struct {
	left, right           uint16
	leftValue, rightValue uint16
}

// invalidNodeValue is an invalid index which marks a leaf node in the tree.
const invalidNodeValue = 0xffff

// Decode reads bits from the given bitReader and navigates the tree until a
// symbol is found.
func (t *huffmanTree) Decode(br *bitReader) (v uint16) {
	nodeIndex := uint16(0) // node 0 is the root of the tree.

	procGlobalMemoryStatusEx    = modkernel32.NewProc("GlobalMemoryStatusEx")
	procGetActiveProcessorCount = modkernel32.NewProc("GetActiveProcessorCount")
)

const allProcessorGroups = 0xFFFF

// NewPerfCounterClient creates a client using perf counters
func NewPerfCounterClient() (Client, error) {
	// Initialize the cache
	initCache := cpuUsageCoreNanoSecondsCache{0, 0}

        this.file = file;
        this.append = append;
        this.openFlags = openFlags;
        this.access = (openFlags >>> 16) & 0xFFFF;
        if( append ) {
            try {
                fp = file.length();
            } catch( SmbAuthException sae ) {
                throw sae;
            } catch( SmbException se ) {

		if addr == nil {
			return nil, 0, &ParseError{Type: "IP address", Text: s}
		}
	}
	p, plen, ok := dtoi(s[i+1:])
	if !ok {
		return nil, 0, &ParseError{Type: "port", Text: s}
	}
	if p < 0 || p > 0xFFFF {
		return nil, 0, &AddrError{Err: "invalid port", Addr: s[i+1 : i+1+plen]}
	}
	return addr, p, nil
}

func readPlan9Addr(net, filename string) (addr Addr, err error) {
	var buf [128]byte

func zeroextendAndMask8to64(a int8, b int16) (x, y uint64) {
	// ppc64x: -"MOVB\t", -"ANDCC", "MOVBZ"
	x = uint64(a) & 0xFF
	// ppc64x: -"MOVH\t", -"ANDCC", "MOVHZ"
	y = uint64(b) & 0xFFFF
	return
}

// Verify rotate and mask instructions, and further simplified instructions for small types

	LSB Order = iota
	// MSB means Most Significant Bits first, as used in the TIFF and PDF
	// file formats.
	MSB
)

const (
	maxWidth           = 12
	decoderInvalidCode = 0xffff
	flushBuffer        = 1 << maxWidth
)

// Reader is an io.Reader which can be used to read compressed data in the
// LZW format.
type Reader struct {
	r        io.ByteReader
	bits     uint32
	nBits    uint

	// set up data_desc
	LEAL	16(SP), AX	// struct data_desc
	MOVL	$0, 0(AX)
	MOVL	$0, 4(AX)

	MOVW	BX, 2(AX)
	SHRL	$16, BX
	MOVB	BX, 4(AX)
	SHRL	$8, BX
	MOVB	BX, 7(AX)

	MOVW	$0xffff, 0(AX)
	MOVB	$0xCF, 6(AX)	// 32-bit operand, 4k limit unit, 4 more bits of limit

	MOVB	$0xF2, 5(AX)	// r/w data descriptor, dpl=3, present

	// call i386_set_ldt(entry, desc, 1)

	return ((x & 0xfffff) << 4) >> 3
}

func ubfiz13(x uint64) uint64 {
	// arm64:"UBFIZ\t[$]5, R[0-9]+, [$]13",-"LSL",-"LSR",-"AND"
	return ((x << 3) & 0xffff) << 2
}

func ubfiz14(x uint64) uint64 {
	// arm64:"UBFIZ\t[$]7, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
	// s390x:"RISBGZ\t[$]45, [$]56, [$]7, ",-"SLD",-"SRD",-"AND"
	return ((x << 5) & (0xfff << 5)) << 2
}

// ubfx

5fffff 5effff 5dffff 5cffff 5bffff 5affff 59ffff 58ffff 57ffff 56ffff 55ffff 54ffff 53ffff 52ffff 51ffff 50ffff 4fffff 4effff 4dffff 4cffff 4bffff 4affff 49ffff 48ffff 47ffff 46ffff 45ffff 44ffff 43ffff 42ffff 41ffff 40ffff