http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50749
--- Comment #4 from Kazumoto Kojima <kkojima at gcc dot gnu.org> 2011-10-19 21:36:56 UTC --- (In reply to comment #3) USE_LOAD_POST_INCREMENT and USE_STORE_PRE_DECREMENT are used only in move_by_pieces which is for some block operations when MOVE_BY_PIECES_P says OK. They don't disable post_inc/pre_dec addressing for SI/DImode in general, I think. It seems that they are 0 for SI/DImode because we have addressing with display for a limited size of memory chunk in these modes, though I'm wrong about it. I'm a bit curious to see what happens if they are changed to non-zero for SI/DImode.
