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We do not need the SmallPtrSet to avoid adding duplicates to OpsToRename, because we already keep a ValueInfo mapping. If we see an op for the first time, Infos will be empty and we can also add it to OpsToRename. We process operands by visiting BBs depth-first and then iterate over all instructions & users, so the order should be deterministic. Therefore we can skip one round of sorting, which we purely needed for guaranteeing a deterministic order when iterating over the SmallPtrSet. Reviewers: efriedma, davide Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D64816 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@367028 91177308-0d34-0410-b5e6-96231b3b80d8