[llvm] [VPlan] First step towards VPlan cost modeling (LegacyCM in CostCtx) (PR #92555)

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``````````bash
git-clang-format --diff a56e6dfd2e6b141b5475c05ad62c378906f565ba c91f8baeaec8c574dec3db446bdc3ef94ee62e99 -- llvm/lib/Transforms/Vectorize/LoopVectorizationPlanner.h llvm/lib/Transforms/Vectorize/LoopVectorize.cpp llvm/lib/Transforms/Vectorize/VPlan.cpp llvm/lib/Transforms/Vectorize/VPlan.h llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index ea2a791d66..cd75371562 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -7458,7 +7458,7 @@ InstructionCost LoopVectorizationPlanner::computeCost(VPlan &Plan,
       if (!CostCtx.SkipCostComputation.insert(I).second)
         continue;
       LLVM_DEBUG(dbgs() << "Cost of " << ReductionCost << " for VF " << VF
-             << ":\n in-loop reduction " << *I << "\n");
+                        << ":\n in-loop reduction " << *I << "\n");
       Cost += *ReductionCost;
     }
   }
diff --git a/llvm/lib/Transforms/Vectorize/VPlan.cpp b/llvm/lib/Transforms/Vectorize/VPlan.cpp
index 065419d4b1..60f6ef3376 100644
--- a/llvm/lib/Transforms/Vectorize/VPlan.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlan.cpp
@@ -782,8 +782,8 @@ InstructionCost VPRegionBlock::computeCost(ElementCount VF,
   bool IsHeaderMaskOrUniformCond =
       vputils::isUniformCompare(Cond) ||
       match(Cond, m_ActiveLaneMask(m_VPValue(), m_VPValue())) ||
-       (match(Cond, m_Binary<Instruction::ICmp>(m_VPValue(), m_VPValue(Op))) &&
-        Op == getPlan()->getOrCreateBackedgeTakenCount()) ||
+      (match(Cond, m_Binary<Instruction::ICmp>(m_VPValue(), m_VPValue(Op))) &&
+       Op == getPlan()->getOrCreateBackedgeTakenCount()) ||
       isa<VPActiveLaneMaskPHIRecipe>(Cond);
   if (IsHeaderMaskOrUniformCond || VF.isScalable())
     return Cost;

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https://github.com/llvm/llvm-project/pull/92555