[llvm] [VPlan] Model branch cond to enter scalar epilogue in VPlan. (PR #92651)

[Florian Hahn via llvm-commits]

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@@ -2970,33 +2970,6 @@ void InnerLoopVectorizer::createVectorLoopSkeleton(StringRef Prefix) {
   LoopScalarPreHeader =
       SplitBlock(LoopMiddleBlock, LoopMiddleBlock->getTerminator(), DT, LI,
                  nullptr, Twine(Prefix) + "scalar.ph");
-
-  auto *ScalarLatchTerm = OrigLoop->getLoopLatch()->getTerminator();
-
-  // Set up the middle block terminator.  Two cases:
-  // 1) If we know that we must execute the scalar epilogue, emit an
-  //    unconditional branch.
-  // 2) Otherwise, we must have a single unique exit block (due to how we
-  //    implement the multiple exit case).  In this case, set up a conditional
-  //    branch from the middle block to the loop scalar preheader, and the
-  //    exit block.  completeLoopSkeleton will update the condition to use an
-  //    iteration check, if required to decide whether to execute the remainder.
-  BranchInst *BrInst =
-      Cost->requiresScalarEpilogue(VF.isVector())
-          ? BranchInst::Create(LoopScalarPreHeader)
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fhahn wrote:

Yes seems like it, adjusted in b6476e5549ccb728336a67faa5078b2021fd389a, thanks!

https://github.com/llvm/llvm-project/pull/92651