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* Fix llvm::ComputeNumSignBits with some operations and llvm.assumeStanislav Mekhanoshin2018-07-251-0/+109
Currently ComputeNumSignBits does early exit while processing some of the operations (add, sub, mul, and select). This prevents the function from using AssumptionCacheTracker if passed. Differential Revision: https://reviews.llvm.org/D49759 llvm-svn: 337936
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