[PATCH] D153638: [CodeGenPrepare][NFC] Update the dominator tree instead of rebuilding it

[Nikita Popov via Phabricator via llvm-commits]

nikic added a comment.

As a high level comment: If we always work on DTU, that would allow to only flush the DT updates when the DT is next accessed, rather than in each transform.



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Comment at: llvm/lib/CodeGen/CodeGenPrepare.cpp:586
   LI->releaseMemory();
-  LI->analyze(getDT(F));
+  LI->analyze(*DT);
 
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Would it be hard to also preserve the DT though the handful of transforms above? If we did that, we could directly use the DT from the pass manager, and also preserve it afterwards as well.


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