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Author SHA1 Message Date
Jiangning Liu
b923ade46b 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.

llvm-svn: 215344
 2014-08-11 05:17:19 +00:00