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Jiangning Liu
e04455d72b
Optimize ZERO_EXTEND and SIGN_EXTEND in both SelectionDAG Builder and type
legalization stage. With those two optimizations, fewer signed/zero extension instructions can be inserted, and then we can expose more opportunities to Machine CSE pass in back-end. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216066 91177308-0d34-0410-b5e6-96231b3b80d8
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