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Author SHA1 Message Date
Jiangning Liu
0679d2d0a4 In Machine CSE pass, the source register of a COPY machine instruction can 
be propagated to all its users, and this propagation could increase the 
probability of finding common subexpressions. If the COPY has only one user,
the COPY itself can be removed.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215344 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-08-11 05:17:19 +00:00