[llvm-branch-commits] [llvm] [LV] Reduce register usage for scaled reductions (PR #133090)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff 5f81501485b6c9d3e6a35fd382e1c10634e9658c 
b11c7631712479056bfd588c5031c065a53466fc --extensions h,cpp -- 
llvm/lib/Transforms/Vectorize/LoopVectorize.cpp 
llvm/lib/Transforms/Vectorize/VPRecipeBuilder.h 
llvm/lib/Transforms/Vectorize/VPlan.h
``````````

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<details>
<summary>
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 8b17622538..101ce4a8ab 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -5033,7 +5033,8 @@ calculateRegisterUsage(VPlan &Plan, 
ArrayRef<ElementCount> VFs,
               VF = VF.divideCoefficientBy(ReductionR->getVFScaleFactor());
             else if (auto *PartialReductionR =
                          dyn_cast<VPPartialReductionRecipe>(R))
-              VF = 
VF.divideCoefficientBy(PartialReductionR->getVFScaleFactor());
+              VF =
+                  
VF.divideCoefficientBy(PartialReductionR->getVFScaleFactor());
             LLVM_DEBUG(if (VF != VFs[J]) {
               dbgs() << "LV(REG): Scaled down VF from " << VFs[J] << " to "
                      << VF << " for ";

``````````

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https://github.com/llvm/llvm-project/pull/133090
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