[PATCH] [LPM] A targeted but somewhat horrible fix to the legacy pass manager's querying of the pass registry.

[Owen Anderson]

Hi Chandler,

In my measurements, this captures about half of the regression, i.e. the regression goes from ~20% to ~10%.  While the reader/writer locks are gone from the profile, several other PassManager related pieces of code have jumped up to take their place:

—Owen

- F362108: ThreadProfile2.png <http://reviews.llvm.org/F362108>


http://reviews.llvm.org/D7213

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