md.texi (setmem): Document new parameter.

md.texi (setmem): Document new parameter.

	* md.texi (setmem): Document new parameter.
	* optabs.c (maybe_gen_insn): Support 9 operands.
	* builtins.c (determine_block_size): Add probable_max_size;
	support anti-ranges.
	(expand_builtin_memcpy. expand_builtin_memset_args): Pass around
	probable_max_size.
	* expr.c (emit_block_move_via_movmem, emit_block_move_hints,
	emit_block_move, clear_storage_hints, set_storage_via_setmem):
	Likewise.
	* expr.h (emit_block_move_hints, clear_storage_hints,
	set_storage_via_setmem): Update prototype.
	* i386.md (setmem, movmem patterns): Add 9th operand.
	* i386-protos.h (ix86_expand_set_or_movmem): Update prototype.
	* i386.c (ix86_expand_set_or_movmem): Take probable_max_size_exp
	argument; pass it to decide_alg.

	* gcc.target/i386/memcpy-3.c: New testcase.

From-SVN: r204997