[llvm] [DAGCombiner] Add support for scalarising extracts of a vector setcc (PR #118823)

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git-clang-format --diff f7685af4a5bd188e6d548967d818d8569f10a70d d67e32bb99a765bfb8c46709ad6fed7cf0e8fe8a --extensions cpp,h -- llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h llvm/lib/Target/AArch64/AArch64ISelLowering.h llvm/lib/Target/RISCV/RISCVISelLowering.cpp llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp llvm/lib/Target/X86/X86ISelLowering.cpp
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View the diff from clang-format here.
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diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
index f8021c49a1..ec27eb31f7 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
@@ -2835,7 +2835,9 @@ void DAGTypeLegalizer::ExpandIntegerResult(SDNode *N, unsigned ResNo) {
   case ISD::SELECT_CC:    SplitRes_SELECT_CC(N, Lo, Hi); break;
   case ISD::UNDEF:        SplitRes_UNDEF(N, Lo, Hi); break;
   case ISD::FREEZE:       SplitRes_FREEZE(N, Lo, Hi); break;
-  case ISD::SETCC:        ExpandIntRes_SETCC(N, Lo, Hi); break;
+  case ISD::SETCC:
+    ExpandIntRes_SETCC(N, Lo, Hi);
+    break;
 
   case ISD::BITCAST:            ExpandRes_BITCAST(N, Lo, Hi); break;
   case ISD::BUILD_PAIR:         ExpandRes_BUILD_PAIR(N, Lo, Hi); break;
diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h b/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h
index 571a710cc9..c672b78b8e 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h
@@ -487,7 +487,7 @@ private:
   void ExpandIntRes_MINMAX            (SDNode *N, SDValue &Lo, SDValue &Hi);
 
   void ExpandIntRes_CMP               (SDNode *N, SDValue &Lo, SDValue &Hi);
-  void ExpandIntRes_SETCC             (SDNode *N, SDValue &Lo, SDValue &Hi);
+  void ExpandIntRes_SETCC(SDNode *N, SDValue &Lo, SDValue &Hi);
 
   void ExpandIntRes_SADDSUBO          (SDNode *N, SDValue &Lo, SDValue &Hi);
   void ExpandIntRes_UADDSUBO          (SDNode *N, SDValue &Lo, SDValue &Hi);

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https://github.com/llvm/llvm-project/pull/118823