BIT_readBitsFast
MEM_STATIC size_t BIT_readBitsFast(BIT_DStream_t* bitD, unsigned nbBits);
size_t const lowBits = BIT_readBitsFast(bitD, nbBits);
offset = ofBase + (BIT_readBitsFast(&seqState->DStream, ofBits - extraBits) << extraBits);
offset += BIT_readBitsFast(&seqState->DStream, extraBits);
offset = ofBase + BIT_readBitsFast(&seqState->DStream, ofBits/*>0*/); /* <= (ZSTD_WINDOWLOG_MAX-1) bits */
offset = ofBase + ll0 + BIT_readBitsFast(&seqState->DStream, 1);
seq.matchLength += BIT_readBitsFast(&seqState->DStream, mlBits/*>0*/);
seq.litLength += BIT_readBitsFast(&seqState->DStream, llBits/*>0*/);