2010-10-07  Martin Jambor  <mjambor@suse.cz>

	* tree-sra.c (struct access): New field grp_assignment_write.
	(dump_access): Dump grp_assignment_write.
	(build_accesses_from_assign): Set grp_assignment_write.
	(sort_and_splice_var_accesses): Aggregate grp_assignment_write.
	(mark_read_status): Renamed to mark_rw_status, individual values
	renamed too.
	(analyze_access_subtree): Changed type of mark_write to
	mark_read_status.  Fixed propagating of mark_read and
	mark_write.  Changed benefit estimate.  Updated comment.

	* testsuite/gcc.dg/tree-ssa/sra-11.c: New test.

From-SVN: r165124