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r323034 | dmgreen | 2018-01-20 11:29:37 +0100 (Sat, 20 Jan 2018) | 9 lines
[Dominators] Fix some edge cases for PostDomTree updating
These fix some odd cfg cases where batch-updating the post
dom tree fails. Usually around infinite loops and roots
ending up being different.
Differential Revision: https://reviews.llvm.org/D42247
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_60@323121 91177308-0d34-0410-b5e6-96231b3b80d8
Summary:
This patch introduces a way of informing the (Post)DominatorTree about multiple CFG updates that happened since the last tree update. This makes performing tree updates much easier, as it internally takes care of applying the updates in lockstep with the (virtual) updates to the CFG, which is done by reverse-applying future CFG updates.
The batch updater is able to remove redundant updates that cancel each other out. In the future, it should be also possible to reorder updates to reduce the amount of work needed to perform the updates.
Reviewers: dberlin, sanjoy, grosser, davide, brzycki
Reviewed By: brzycki
Subscribers: mgorny, llvm-commits
Differential Revision: https://reviews.llvm.org/D36167
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@311015 91177308-0d34-0410-b5e6-96231b3b80d8
Hans Wennborg