llvm-project/llvm/test/Instrumentation/InstrProfiling
Vedant Kumar ee6c233ae0 [InstrProf] Use atomic profile counter updates for TSan
Thread sanitizer instrumentation fails to skip all loads and stores to
profile counters. This can happen if profile counter updates are merged:

  %.sink = phi i64* ...
  %pgocount5 = load i64, i64* %.sink
  %27 = add i64 %pgocount5, 1
  %28 = bitcast i64* %.sink to i8*
  call void @__tsan_write8(i8* %28)
  store i64 %27, i64* %.sink

To suppress TSan diagnostics about racy counter updates, make the
counter updates atomic when TSan is enabled. If there's general interest
in this mode it can be surfaced as a clang/swift driver option.

Testing: check-{llvm,clang,profile}

rdar://40477803

Differential Revision: https://reviews.llvm.org/D50867

llvm-svn: 339955
2018-08-16 22:24:47 +00:00
..
X86
PR23499.ll
always_inline.ll
atomic-updates.ll [InstrProf] Use atomic profile counter updates for TSan 2018-08-16 22:24:47 +00:00
early-exit.ll
icall.ll
linkage.ll [InstrProf] Don't register __llvm_profile_runtime_user 2018-07-27 22:21:35 +00:00
no-counters.ll [InstrProfiling] Emit the runtime hook when no counters are lowered 2018-02-28 19:00:08 +00:00
noruntime.ll
platform.ll [InstrProf] Don't register __llvm_profile_runtime_user 2018-07-27 22:21:35 +00:00
profiling.ll [InstrProfiling] Emit the runtime hook when no counters are lowered 2018-02-28 19:00:08 +00:00