NOCMPR2

However, under NOCMPR2, id-2 is augmented before id-5 is set. This change creates an incompatibility when id-6 is dependent on id-2.

Consider the following example:

PERFORM PARA3 VARYING X FROM 1 BY 1 UNTIL X IS GREATER THAN 3
          AFTER Y FROM X BY 1 UNTIL Y IS GREATER THAN 3.

In this example, id-6 (X) is dependent on id-2 (X) because they are identical.

Under CMPR2, PARA3 will be executed eight times with the following values:

              X:    1   1   1   2   2   2   3   3
              Y:    1   2   3   1   2   3   2   3

Under NOCMPR2, PARA3 will be executed six times with the following values:

              X:    1   1   1   2   2   3
              Y:    1   2   3   2   3   3

A dependency between identifiers occurs if the first identifier is identical to, subscripted with, a partial or full redefinition of, or variably located depending on the second identifier.