2010-01-21  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/42585
	* tree-sra.c (struct access): New field grp_total_scalarization.
	(dump_access): Dump the new field.
	(should_scalarize_away_bitmap): New variable.
	(cannot_scalarize_away_bitmap): Likewise.
	(sra_initialize): Allocate new bitmaps.
	(sra_deinitialize): Free new bitmaps.
	(create_access_1): New function.
	(create_access): Parts moved to create_access_1.
	(type_consists_of_records_p): New function.
	(completely_scalarize_record): Likewise.
	(build_access_from_expr): Set bit in cannot_scalarize_away_bitmap.
	(build_accesses_from_assign): Set bits in should_scalarize_away_bitmap.
	(sort_and_splice_var_accesses): Hint groups with a total_scalarization
	access.
	(analyze_all_variable_accesses): Completely scalarize small eligible
	records.

	* testsuite/gcc.dg/tree-ssa/pr42585.c: New test.

From-SVN: r156156