2010-04-23  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/43846
	* tree-sra.c (struct access): New flag grp_assignment_read.
	(build_accesses_from_assign): Set grp_assignment_read.
	(sort_and_splice_var_accesses): Propagate grp_assignment_read.
	(enum mark_read_status): New type.
	(analyze_access_subtree): Propagate grp_assignment_read, create
	accesses also if both direct_read and root->grp_assignment_read.

	* testsuite/gcc.dg/tree-ssa/sra-10.c: New test.

From-SVN: r158668