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* Improve code generation for thread_local variables:Richard Smith2019-09-121-0/+12
Summary: * Don't bother using a thread wrapper when the variable is known to have constant initialization. * Emit the thread wrapper as discardable-if-unused in TUs that don't contain a definition of the thread_local variable. * Don't emit the thread wrapper at all if the thread_local variable is unused and discardable; it will be emitted by all TUs that need it. Reviewers: rjmccall, jdoerfert Subscribers: cfe-commits Tags: #clang Differential Revision: https://reviews.llvm.org/D67429 llvm-svn: 371767
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