Conditional Cycle Loops

Can set up a non-incremental DO loop which, on some iterations, only executes a subset of the statements in the body of the loop,

    DO
     DO
      ...
      IF (a.GT.b) EXIT
      ...
      IF (a.EQ.b) CYCLE
      ...
     END DO
     IF (c.GT.d) EXIT
    END DO

CYCLE forces control to the innermost active DO statement and the loop begins a new iteration.

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