Intel® VTune™ Amplifier
Throughout the memory hierarchy, data moves at cache line granularity - 64 bytes per line. Although this is much larger than many common data types, such as integer, float, or double, unaligned values of these or other types may span two cache lines. Split stores metric shows the fraction of demand stores that generated a split store.
A significant proportion of cycles is spent handling split loads. Consider aligning your data to the 64-byte cache line granularity.