me = 32 - bits.TrailingZeros32(uint32(mask))
		mbn = bits.LeadingZeros32(^uint32(mask))
		men = 32 - bits.TrailingZeros32(^uint32(mask))
	} else {
		mb = bits.LeadingZeros64(uint64(mask))
		me = 64 - bits.TrailingZeros64(uint64(mask))
		mbn = bits.LeadingZeros64(^uint64(mask))
		men = 64 - bits.TrailingZeros64(^uint64(mask))
	}
	// Check for a wrapping mask (e.g bits at 0 and 63)

            result *= n;
            result /= i;
          }
          return result;
        } else {
          int nBits = LongMath.log2(n, RoundingMode.CEILING);

          long result = 1;
          long numerator = n--;
          long denominator = 1;

          int numeratorBits = nBits;
          // This is an upper bound on log2(numerator, ceiling).

          /*

// immIFits checks whether the immediate value x fits in nbits bits
// as a signed integer. If it does not, an error is returned.
func immIFits(x int64, nbits uint) error {
	nbits--
	min := int64(-1) << nbits
	max := int64(1)<<nbits - 1
	if x < min || x > max {
		if nbits <= 16 {
			return fmt.Errorf("signed immediate %d must be in range [%d, %d] (%d bits)", x, min, max, nbits)
		}

            result *= n;
            result /= i;
          }
          return result;
        } else {
          int nBits = LongMath.log2(n, RoundingMode.CEILING);

          long result = 1;
          long numerator = n--;
          long denominator = 1;

          int numeratorBits = nBits;
          // This is an upper bound on log2(numerator, ceiling).

          /*

import (
	"bytes"
	"fmt"
	"io"
	"math/bits"
	"strings"
	"testing"
)

func TestMaxBase(t *testing.T) {
	if MaxBase != len(digits) {
		t.Fatalf("%d != %d", MaxBase, len(digits))
	}
}

// log2 computes the integer binary logarithm of x.
// The result is the integer n for which 2^n <= x < 2^(n+1).
// If x == 0, the result is -1.
func log2(x Word) int {
	return bits.Len(uint(x)) - 1
}

	cnt  uint32  // number of valid bits in the bits field
}

// makeBitReader makes a bit reader starting at off.
func (r *Reader) makeBitReader(data block, off int) bitReader {
	return bitReader{
		r:    r,
		data: data,
		off:  uint32(off),
	}
}

// moreBits is called to read more bits.
// This ensures that at least 16 bits are available.
func (br *bitReader) moreBits() error {
	for br.cnt < 16 {

// To rotate x right by k bits, call RotateLeft8(x, -k).
//
// This function's execution time does not depend on the inputs.
func RotateLeft8(x uint8, k int) uint8 {
	const n = 8
	s := uint(k) & (n - 1)
	return x<<s | x>>(n-s)
}

// RotateLeft16 returns the value of x rotated left by (k mod 16) bits.
// To rotate x right by k bits, call RotateLeft16(x, -k).
//

func bitSetTest(x int) bool {
	// amd64:"ANDL\t[$]9, AX"
	// amd64:"CMPQ\tAX, [$]9"
	return x&9 == 9
}

// mask contiguous one bits
func cont1Mask64U(x uint64) uint64 {
	// s390x:"RISBGZ\t[$]16, [$]47, [$]0,"
	return x & 0x0000ffffffff0000
}

// mask contiguous zero bits
func cont0Mask64U(x uint64) uint64 {
	// s390x:"RISBGZ\t[$]48, [$]15, [$]0,"
	return x & 0xffff00000000ffff
}

	// cur is the bit buffer that has not been fed into n.
	// cbits is the number of low order bits in cur that are valid.
	// sbits is the number of bits of the symbol prefix being decoded.
	cur, cbits, sbits := uint(0), uint8(0), uint8(0)
	for _, b := range v {
		cur = cur<<8 | uint(b)
		cbits += 8
		sbits += 8
		for cbits >= 8 {
			idx := byte(cur >> (cbits - 8))
			n = n.children[idx]
			if n == nil {

	}

	switch x.form {
	case finite:
		// 0 < |x| < +Inf

		const (
			fbits = 32                //        float size
			mbits = 23                //        mantissa size (excluding implicit msb)
			ebits = fbits - mbits - 1 //     8  exponent size
			bias  = 1<<(ebits-1) - 1  //   127  exponent bias
			dmin  = 1 - bias - mbits  //  -149  smallest unbiased exponent (denormal)