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JeanDavid says

Only trouble was that it made a slight error in compiling one particular program: the FORTRAN compiler. The FORTRAN compiler passed its regression tests, but a user got errors in his FORTRAN program. When all was said and done, we discovered the problem and I fixed it in a minute or two. But we first tried to find the error in the users program, and there was no error. We had not modified the FORTRAN compiler, so it could not have been the compiler -- but it was the only program we had that gave wrong results, namely bad executable programs. We rebuilt it with the optimizer turned off, and then it worked OK. So we knew it had to be the optimizer.

Some problems are not easy to understand, are hard to find and, fortunately, are easy to fix.

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