[llvm-branch-commits] [llvm] [LVer][profcheck] explicitly set unknown branch weights for the versioned/unversioned selector (PR #164507)

[Florian Hahn via llvm-branch-commits]

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@@ -109,8 +110,13 @@ void LoopVersioning::versionLoop(
   // Insert the conditional branch based on the result of the memchecks.
   Instruction *OrigTerm = RuntimeCheckBB->getTerminator();
   Builder.SetInsertPoint(OrigTerm);
-  Builder.CreateCondBr(RuntimeCheck, NonVersionedLoop->getLoopPreheader(),
-                       VersionedLoop->getLoopPreheader());
+  auto *BI =
+      Builder.CreateCondBr(RuntimeCheck, NonVersionedLoop->getLoopPreheader(),
+                           VersionedLoop->getLoopPreheader());
+  // We don't know what the probability of executing the versioned vs the
+  // unversioned variants is.
+  setExplicitlyUnknownBranchWeightsIfProfiled(
+      *BI, *BI->getParent()->getParent(), DEBUG_TYPE);
----------------
fhahn wrote:

```suggestion
      *BI, *BI->getFunction(), DEBUG_TYPE);
```



https://github.com/llvm/llvm-project/pull/164507