[PATCH] D96979: [DSE] Extending IsGuaranteedLoopInvariant to support a GetElementPtrInst defined in the entry block

[Matteo Favaro via Phabricator via llvm-commits]

fvrmatteo updated this revision to Diff 324800.
fvrmatteo added a comment.

I tried to update the patch to execute the entry block check on the incoming pointer (if it's an instruction) as first thing in the **IsGuaranteedLoopInvariant** function.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D96979/new/

https://reviews.llvm.org/D96979

Files:
  llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp


Index: llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
+++ llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
@@ -1911,6 +1911,11 @@
     };
 
     Ptr = Ptr->stripPointerCasts();
+    if (auto *I = dyn_cast<Instruction>(Ptr)) {
+      if (I->getParent() == &I->getFunction()->getEntryBlock()) {
+        return true;
+      }
+    }
     if (auto *GEP = dyn_cast<GEPOperator>(Ptr)) {
       return IsGuaranteedLoopInvariantBase(GEP->getPointerOperand()) &&
              GEP->hasAllConstantIndices();


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