2009-09-02  Martin Jambor  <mjambor@suse.cz>

	* tree-sra.c (struct access): New field grp_hint.
	(dump_access): Dump grp_hint.
	(sort_and_splice_var_accesses): Set grp_hint if a group is read
	multiple times.
	(analyze_access_subtree): Only scalarize accesses with grp_hint set or
	those which have been specifically read and somehow written to.
	(propagate_subacesses_accross_link): Set grp_hint of right child and
	also possibly of the left child.

	* testsuite/gcc.dg/tree-ssa/sra-8.c: New testcase.
	* testsuite/gcc.dg/memcpy-1.c: Add . to match pattern.
	* testsuite/gcc.dg/uninit-I.c: XFAIL warning test.
	* testsuite/g++.dg/warn/unit-1.C: XFAIL warning test.

From-SVN: r151345