The GCD and Banejee tests are the standard subscript dependence tests used to determine whether loops may be paraUelized/vectorized. The present work discusses the I Test, a subscript dependence test which extends both the range of applicability and the accuracy of these tests. It promises to be especially useful when, in the event that a positive result must be reported, a definite positive is of more use than a tentative positive, and when insufficient loop iteration limits are known for the Banejee test to apply.

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