kNumMoveBits
#define UPDATE_0(p) range = bound; *(p) = (CLzmaProb)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits));
#define UPDATE_1(p) range -= bound; code -= bound; *(p) = (CLzmaProb)(ttt - (ttt >> kNumMoveBits));
ttt += (kBitModelTotal - ttt) >> kNumMoveBits;
ttt -= ttt >> kNumMoveBits;