re PR tree-optimization/36228 (redundant runtime check while vectorizing)

re PR tree-optimization/36228 (redundant runtime check while vectorizing)

2008-05-16  Sebastian Pop  <sebastian.pop@amd.com>
	    Jan Sjodin  <jan.sjodin@amd.com>

	PR tree-optimization/36228
	* tree-data-ref.c (initialize_data_dependence_relation): Fast dependence
	test when the references are the same, call compute_self_dependence.
	* tree-data-ref.h (struct data_dependence_relation): Add self_reference_p.
	(DDR_SELF_REFERENCE): New.

	* testsuite/gcc.dg/vect/pr36228.c: New.

Co-Authored-By: Jan Sjodin <jan.sjodin@amd.com>
From-SVN: r135426