tree fe09b435be0e22bceb412d815d6b9c7395265e7e
parent 1505fa4376fb5c97625efa36d83beca49b864b2d
author Jiangning Liu <jiangning.liu@arm.com> 1407734239 +0000
committer Jiangning Liu <jiangning.liu@arm.com> 1407734239 +0000

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