Introduce layered SCoP detection and data reference building.

Introduce layered SCoP detection and data reference building.

2009-05-07  Tobias Grosser  <grosser@fim.uni-passau.de>

	* graphite-scop-detection.c (graphite_can_represent_scev): Only
	allow integer constant strides.
	(graphite_can_represent_expr): Depend on outermost_loop.
	(stmt_simple_memref_p, graphite_cannot_represent_loop,
	harmful_stmt_in_bb, is_simple_operand, stmt_simple_for_scop_p,
	build_scops_1): Same.
	(scopdet_basic_block_info): Same and insert layered SCoP
	detection.
 	(try_generate_gimple_bb): Cleanup.
	(build_scops): Enable data references.

	* testsuite/gcc.dg/graphite/id-5.c: New.
	* testsuite/gcc.dg/graphite/id-9.c: New.
	* tree-chrec.c (evolution_function_right_is_integer_cst): New.
	* tree-chrec.h (evolution_function_right_is_integer_cst): New.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/graphite@147219 138bc75d-0d04-0410-961f-82ee72b054a4