re PR tree-optimization/37686 (Building of CPU2000's bzip2 with peak flags with -mcpu=power4 fails with an ICE.)

2008-10-15  Sebastian Pop  <sebastian.pop@amd.com>

	PR tree-optimization/37686
	* testsuite/gcc.dg/tree-ssa/pr37686.c: New.
	* tree-loop-linear.c (linear_transform_loops): Build a
	loop nest vector.  Pass it to lambda_compute_access_matrices.
	* tree-data-ref.h (struct access_matrix): Store the loop nest
	relative to which it encodes the information.
	(AM_LOOP_NEST_NUM): Renamed AM_LOOP_NEST.
	(am_vector_index_for_loop): Reimplemented: iterate over the
	loop nest for finding the loop index in the access matrix.
	(lambda_compute_access_matrices): Update declaration.
	* lambda-code.c (build_access_matrix): Pass the loop nest and
	record it.
	(lambda_compute_access_matrices): Same.

From-SVN: r141141