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70071434ae
PR1877.
A3 = op A2 B0<kill>
...
B1 = A3 <- this copy
...
= op A3 <- more uses
==>
B2 = op B0 A2<kill>
...
B1 = B2 <- now an identify copy
...
= op B2 <- more uses
This speeds up FreeBench/neural by 29%, Olden/bh by 12%, oopack_v1p8 by 53%.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47046 91177308-0d34-0410-b5e6-96231b3b80d8
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