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JeanDavid says

"Optimization is like having a friend who does you many good favors, but is also a drug addict and occasionally steals from you."

It does not if there are no bugs in the optimizer. It can still have surprises though. Our optimizer was severely tested for bugs. First of all, it started out as a relatively simple program, so there were few bugs in it. We introduced only a few changes at a time, and we had an independent test group doing the testing. First of all, we ran a suite of test programs on it designed to catch obvious bugs. As we got bug reports from other users in the company, if we could duplicate the problems, we added them to the test suite.

To be more clear, I don't think this was caused by a code optimizer. I suspect it was a programmer's optimization at the source code level.
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