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clang-p2996/llvm/lib/Analysis/ValueTracking.cpp
Craig Topper 86dea1f39b [ValueTracking] Improve llvm.abs handling in computeKnownBits. 
Add the optimizations we have in the SelectionDAG version.
Known non-negative copies all known bits. Any known one other than
the sign bit makes result non-negative.

Differential Revision: https://reviews.llvm.org/D85000
2020-07-31 15:55:03 -07:00

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