[PATCH] Add a lock() function in PassRegistry to speed up multi-thread synchronization.

[Erik Eckstein]

Hi Owen, Chandler,

> Do you mean with a release *+* asserts build?


Yes, sorry I wrote it wrong.

I think initial description was not very good. I'll try to explailn again: there are two issues

1. multithread-performance problem in the assert build: I understand that assert builds are slower than release builds, but in this case it's a factor of 4 when running with 4 threads, i.e. the multithreaded version is slower than the single-threaded version! This makes the asserts build useless for my purpose.

2. Even in the release build there is a performance penalty of about 5% because of the mutex.

With my proposed patch both problems would be solved.


http://reviews.llvm.org/D7787

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