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Speaking of being stuck on one address, my professor once told this tale of misoptimization, quite possibly apocryphal. It seems these computer architects were looking to speed up their machine. They looked at their dynamic instruction counts and picked a branch instruction that was heavily used. After fixing the microcode they started up the system again and noticed NO improvement in speed. Turns out the branch was used by the idle loop in the scheduler. All they did was make the CPU spin its wheels faster.
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