PR target/3144
	* expr.c (move_by_pieces_ninsns): Add max_size argument.
	(MOVE_BY_PIECES_P): Pass MOVE_MAX_PIECES + 1 to it.
	(CLEAR_BY_PIECES_P): Pass STORE_MAX_PIECES + 1 to it.
	(STORE_BY_PIECES_P): Define similarly to CLEAR_BY_PIECES_P,
	but using MOVE_RATIO.
	(move_by_pieces): Pass max_size to move_by_pieces_ninsns.
	(can_store_by_pieces): Change max_size type to unsigned int.
	(store_by_pieces_1): Likewise.  Pass max_size to
	move_by_pieces_ninsns.
	* config/s390/s390.h (STORE_BY_PIECES_P): Define.
	* config/sh/sh.c (MOVE_BY_PIECES_P): Pass MOVE_MAX_PIECES + 1
	to move_by_pieces_ninsns.
	(STORE_BY_PIECES_P): Define.
	* config/ns32k/ns32k.h (STORE_BY_PIECES_P): Pass STORE_MAX_PIECES + 1
	to move_by_pieces_ninsns.
	* doc/tm.texi (STORE_BY_PIECES_P): Document changed default.

	* config/i386/i386.h (CLEAR_RATIO): Define.

From-SVN: r85750