re PR target/63679 ([AArch64] Failure to constant fold.)

re PR target/63679 ([AArch64] Failure to constant fold.)

2014-11-24  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/63679
	* tree-ssa-sccvn.c: Include ipa-ref.h, plugin-api.h and cgraph.h.
	(copy_reference_ops_from_ref): Fix non-constant ADDR_EXPR case
	to properly leave off at -1.
	(fully_constant_vn_reference_p): Generalize folding from
	constant initializers.
	(vn_reference_lookup_3): When looking through aggregate copies
	handle offsetted reads and try simplifying the result to
	a constant.
	* gimple-fold.h (fold_ctor_reference): Export.
	* gimple-fold.c (fold_ctor_reference): Likewise.

	* gcc.dg/tree-ssa/ssa-fre-42.c: New testcase.
	* gcc.dg/tree-ssa/20030807-5.c: Avoid folding read from global to zero.
	* gcc.target/i386/ssetype-1.c: Likewise.
	* gcc.target/i386/ssetype-3.c: Likewise.
	* gcc.target/i386/ssetype-5.c: Likewise.

From-SVN: r218019