GNU Info

(g77-300.info)Transforming Iterative DO

---

Next: Transforming Block IF Prev: Transforming DO WHILE Up: Transforming Statements

---

Enter node , (file) or (file)node

Transforming Iterative DO
-------------------------

   An iterative `DO' loop (one that specifies an iteration variable) is
required by the Fortran standards to be implemented as though an
iteration count is computed before entering the loop body, and that
iteration count used to determine the number of times the loop body is
to be performed (assuming the loop isn't cut short via `GOTO' or
`EXIT').

   The FFE handles this by allocating a temporary variable to contain
the computed number of iterations.  Since this variable must be in a
scope that includes the entire loop, a GBEL block is created for that
loop, and the variable declared as belonging to the scope of that block.