LZ4_NbCommonBytes
ip += LZ4_NbCommonBytes(diff);
ip += LZ4_NbCommonBytes(diff);
ip += LZ4_NbCommonBytes(diff);
ip += LZ4_NbCommonBytes(diff);
ip += LZ4_NbCommonBytes(diff);
ip += LZ4_NbCommonBytes(diff);