[not2b]

There are other ways to exploit formal verification. For example, you may be able to formally prove that the unoptimized version of your program has the same behavior as the optimized version, subject to specified constraints. This can assure that there aren't any bugs in the optimization that affect program correctness. You're eliminating a class of bugs. Of course, it's possible that the unoptimized version is incorrect, but at least you can assure that your aggressive optimization approach didn't cause breakage. Such approaches are commonly used for hardware verification.