Implement both methods of compare-and-exchange operations described in Section XXXXXXXXXXi.e., Version 1 and Version 2), operating upon blocks of four numbers. Measure the performance of the methods....

Implement both methods of compare-and-exchange operations described in Section 10.2.1 (i.e., Version 1 and Version 2), operating upon blocks of four numbers. Measure the performance of the methods. Devise an experiment to show that it is possible to obtain erroneous results on a heterogeneous system with computers having different arithmetic precisions (if available).