FortranH on the other hand was willing to make lots of assumptions to generate faster code. Optimization level 0 was expected to be the same as FortranG's best optimization setting, and levels 1 and 2 were quite willing to make assumptions that had no basis in the Fortran language--any particular standard version, not that IBM cared about such things then. So the usual was to develop with FortranG. If the code ran fine, you could try taking out the debugging statements and see if it still ran, or you could try to use FortranH. Fixed all the "bugs" at level 0? Try level 1. As for level 2, you had to be a glutton for punishment, or developing code that would consume days of IBM mainframe time to even try setting it.

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