Revert r275883 and r275891. They seem to cause PR28608.
Revert "[LoopSimplify] Update LCSSA after separating nested loops."
This reverts commit r275891.
Revert "[LCSSA] Post-process PHI-nodes created by SSAUpdate when constructing LCSSA form."
This reverts commit r275883.
llvm-svn: 276064
diff --git a/llvm/lib/Transforms/Utils/LCSSA.cpp b/llvm/lib/Transforms/Utils/LCSSA.cpp
index bee6e24..9658966 100644
--- a/llvm/lib/Transforms/Utils/LCSSA.cpp
+++ b/llvm/lib/Transforms/Utils/LCSSA.cpp
@@ -115,8 +115,7 @@
SmallVector<PHINode *, 16> AddedPHIs;
SmallVector<PHINode *, 8> PostProcessPHIs;
- SmallVector<PHINode *, 4> InsertedPHIs;
- SSAUpdater SSAUpdate(&InsertedPHIs);
+ SSAUpdater SSAUpdate;
SSAUpdate.Initialize(I->getType(), I->getName());
// Insert the LCSSA phi's into all of the exit blocks dominated by the
@@ -185,14 +184,6 @@
// Otherwise, do full PHI insertion.
SSAUpdate.RewriteUse(*UseToRewrite);
-
- // SSAUpdater might have inserted phi-nodes inside other loops. We'll need
- // to post-process them to keep LCSSA form.
- for (PHINode *InsertedPN : InsertedPHIs) {
- if (auto *OtherLoop = LI.getLoopFor(InsertedPN->getParent()))
- if (!L->contains(OtherLoop))
- PostProcessPHIs.push_back(InsertedPN);
- }
}
// Post process PHI instructions that were inserted into another disjoint