* expr.c (MOVE_BY_PIECES_P): Define condition for deciding to use
	move_by_pieces.
	(MOVE_MAX_PIECES): Define maximum number of bytes to move at once.
	(USE_LOAD_POST_INCREMENT, USE_LOAD_PRE_DECREMENT): Define defaults.
	(USE_STORE_POST_INCREMENT, USE_STORE_PRE_DECREMENT): Define defaults.
	(move_by_pieces): Use new macros.
	(emit_block_move): Use new macros.
	(clear_by_pieces): Use new macros.
	(clear_storage): Use new macros.
	(emit_push_insn): Use new macros.
	(expand_expr): Use new macros.
	* config/sh/sh.h (USE_LOAD_POST_INCREMENT, USE_LOAD_PRE_DECREMENT):
	Define.
	(USE_STORE_POST_INCREMENT, USE_STORE_PRE_DECREMENT): Define.
	(MOVE_BY_PIECES_P): Define based on alignment and TARGET_SMALLCODE.
	(MOVE_MAX_PIECES): move 8 bytes on SH4.
	* tm.texi(MOVE_BY_PIECES_P, MOVE_MAX_PIECES, USE_LOAD_POST_INCREMENT,
	USE_LOAD_PRE_DECREMENT, USE_STORE_POST_INCREMENT,
	USE_STORE_PRE_DECREMENT): Describe new macros.

From-SVN: r24801