2011-12-06  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/51245
	* tree-ssa-sccvn.c (vn_reference_lookup_or_insert_constant_for_pieces):
	New function.
	(vn_reference_lookup_3): Use it.  Properly valueize all refs
	we create.

	* gcc.dg/torture/pr51245.c: New testcase.

From-SVN: r182044