mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2025-02-01 05:01:59 +01:00
155722cf56
This adds option -tsan-compound-read-before-write to emit different instrumentation for the write if the read before that write is omitted from instrumentation. The default TSan runtime currently does not support the different instrumentation, and the option is disabled by default. Alternative runtimes, such as the Kernel Concurrency Sanitizer (KCSAN) can make use of the feature. Indeed, the initial motivation is for use in KCSAN as it was determined that due to the Linux kernel having a large number of unaddressed data races, it makes sense to improve performance and reporting by distinguishing compounded operations. E.g. the compounded instrumentation is typically emitted for compound operations such as ++, +=, |=, etc. By emitting different reports, such data races can easily be noticed, and also automatically bucketed differently by CI systems. Reviewed By: dvyukov, glider Tags: #llvm Differential Revision: https://reviews.llvm.org/D83867