Entropy Overload – Delphi XE2 introduced namespaces across the runtime library. This stressed unit name lookup inside the compiler, and led to some severe performance regressions in certain cases. So during the runup to the XE2 release, I fired up a profiler and started investigating. It turns out there were numerous situations where lookups were being performed repeatedly with the same arguments, and logically the results should have been consistent across these repeated calls. A relatively cheap and easy fix seemed to be memoization. So I added a caching infrastructure to the compiler and used the profiler to ...
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Kyle A. Miller