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| author | Vedant Kumar <vsk@apple.com> | 2018-08-16 22:24:47 +0000 |
|---|---|---|
| committer | Vedant Kumar <vsk@apple.com> | 2018-08-16 22:24:47 +0000 |
| commit | ee6c233ae045f36f5bb5c7a8d14cfc9d41c634d0 (patch) | |
| tree | f743e5d472f7bd629ce33757b8b837644a976f07 /llvm/lib/Transforms/Utils | |
| parent | ada3f77e4420d30e7bf39e215763a66e1ebdbe97 (diff) | |
| download | bcm5719-llvm-ee6c233ae045f36f5bb5c7a8d14cfc9d41c634d0.tar.gz bcm5719-llvm-ee6c233ae045f36f5bb5c7a8d14cfc9d41c634d0.zip | |
[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
Diffstat (limited to 'llvm/lib/Transforms/Utils')
0 files changed, 0 insertions, 0 deletions
