HUF_encodeSymbol
HUF_encodeSymbol(bitC, ip[n - u], ct, 0, 1);
HUF_encodeSymbol(bitC, ip[n - kUnroll], ct, 0, kLastFast);
HUF_encodeSymbol(bitC, ip[n - u], ct, /* idx */ 0, /* fast */ 1);
HUF_encodeSymbol(bitC, ip[n - kUnroll], ct, /* idx */ 0, /* fast */ kLastFast);
HUF_encodeSymbol(bitC, ip[n - kUnroll - u], ct, /* idx */ 1, /* fast */ 1);
HUF_encodeSymbol(bitC, ip[n - kUnroll - kUnroll], ct, /* idx */ 1, /* fast */ kLastFast);
HUF_encodeSymbol(bitC, ip[--n], ct, 0, /* fast */ 0);