[PATCH] D18164: [tsan] Do not instrument reads/writes to instruction profile counters.

[Anna Zaks via llvm-commits]

zaks.anna created this revision.
zaks.anna added reviewers: vsk, kcc, dvyukov, kubabrecka.
zaks.anna added a subscriber: llvm-commits.

We have known races on profile counters, which can be reproduced by enabling -fsanitize=thread and -fprofile-instr-generate simultaneously on a multi-threaded program. This patch avoids reporting those races by not instrumenting the reads and writes coming from the instruction profiler.

http://reviews.llvm.org/D18164

Files:
  include/llvm/ProfileData/InstrProf.h
  lib/ProfileData/InstrProf.cpp
  lib/Transforms/Instrumentation/ThreadSanitizer.cpp
  test/Instrumentation/ThreadSanitizer/do-not-instrument-memory-access.ll

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