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...em asserts because a DominatorTree pass option has already been created. This is perplexing since this means that the atomic compare and swap operation on static var "initialized" contained in CALL_ONCE_INITIALIZATION(...) did not prevent the pass's associated initialize""PassOnce(...) function from being invoked more than once. Logically, baring other knowledge, the only way this can happen is that CALL_ONCE_INITIALIZATION(...) is instantiated in at least two places. Although I forced the example to exemplify the issue for the DominatorTree pass, this problem has nothin...

...\ - sys::MemoryFence(); \ - while (tmp != 2) { \ - tmp = initialized; \ - sys::MemoryFence(); \ - } \ - } \ - TsanHappensAfter(&initialized); + initialized = 1; \ + } #define INITIALIZE_PASS(passName, arg, name, cfg, analysis) \ static void* initialize##passName##PassOnce(PassRegistry &Registry) { \ diff --git a/llvm/llvm.svnrev.170375/lib/VMCore/PassRegistry.cpp b/llvm/llvm.svnrev.170375/lib/VMCore/PassRegistry.cpp index 5d22879..8cca689 100644 --- a/llvm/llvm.svnrev.170375/lib/VMCore/PassRegistry.cpp +++ b/llvm/llvm.svnrev.170375/lib/VMCore/PassRegistry.cpp @...