* lower-subreg.c (simple_move_operand): New static function,
	broken out of simple_move.  Reject LABEL_REF, SYMBOL_REF, and HIGH
	operands.
	(simple_move): Call simple_move_operand.
	(find_decomposable_subregs): Add special handling of MEMs.
	(can_decompose_p): Rename from cannot_decompose_p.  Reverse
	meaning of return value.  If we see a hard register, test whether
	it can store a word_mode value.  Change all callers.

From-SVN: r121553