[llvm] [IR][LangRef] Add partial reduction add intrinsic (PR #94499)

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


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``````````bash
git-clang-format --diff 6150e84cfc87d118f8cd2794e40dd021c8779e9d f365ac737c27d3c9e5978d3c64787749d89355a7 -- llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index f24723a452..e9c1a109c7 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -7921,15 +7921,19 @@ void SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I,
     auto Index = DAG.getVectorIdxConstant(0, DL);
     auto FullTy = OpNode.getValueType();
 
-    auto ResultVector = DAG.getSplat(ReducedTy, DL, DAG.getConstant(0, DL, ReducedTy.getScalarType()));
-    unsigned ScaleFactor = FullTy.getVectorMinNumElements() / ReducedTy.getVectorMinNumElements();
+    auto ResultVector = DAG.getSplat(
+        ReducedTy, DL, DAG.getConstant(0, DL, ReducedTy.getScalarType()));
+    unsigned ScaleFactor =
+        FullTy.getVectorMinNumElements() / ReducedTy.getVectorMinNumElements();
 
-    for(unsigned i = 0; i < ScaleFactor; i++) {
+    for (unsigned i = 0; i < ScaleFactor; i++) {
       auto SourceIndex = DAG.getVectorIdxConstant(i * ScaleFactor, DL);
       auto TargetIndex = DAG.getVectorIdxConstant(i, DL);
-      auto N = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, ReducedTy, {OpNode, SourceIndex});
+      auto N = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, ReducedTy,
+                           {OpNode, SourceIndex});
       N = DAG.getNode(ISD::VECREDUCE_ADD, DL, ReducedTy.getScalarType(), N);
-      ResultVector = DAG.getNode(ISD::INSERT_VECTOR_ELT, DL, ReducedTy, {ResultVector, N, TargetIndex});
+      ResultVector = DAG.getNode(ISD::INSERT_VECTOR_ELT, DL, ReducedTy,
+                                 {ResultVector, N, TargetIndex});
     }
 
     setValue(&I, ResultVector);

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https://github.com/llvm/llvm-project/pull/94499