http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57908
--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Yann Droneaud from comment #8) > Could someone comment on which optimisation is achieved by aligning such > small arrays ? The simple answer is so each array is more likely to fit into a cache line: One use of this macro is to increase alignment of medium-size data to make it all fit in fewer cache lines. */
