Rational Developer for System z
Enterprise PL/I for z/OS, Version 3.8, Migration Guide

FIXED DEC as a loop control

A DO-loop that has a FIXED DECIMAL or PICTURE control variable will perform much worse than a loop that has a FIXED BINARY control variable.

You can get significantly better code if you change the declarations for your loop control variables from FIXED DEC to FIXED BIN(31).


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