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Commit 9dbe99dc authored by Evan Cheng's avatar Evan Cheng
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A number of LSR fixes: 

- ChangeCompareStride only reuse stride that is larger than current stride. It
  will let the general reuse mechanism to try to reuse a smaller stride.
- Watch out for multiplication overflow in ChangeCompareStride.
- Replace std::set with SmallPtrSet.

llvm-svn: 43408
parent 6698b433
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