[llvm] [WIP][SelectionDAG] Add support for the 3-way comparison intrinsics [US]CMP (PR #91871)

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git-clang-format --diff d98a78590f4f9e43fdfb69fde7d154a985e4560f 0590ce071aa2b3cd6b64b569ace8a869c16ca0d3 -- llvm/include/llvm/CodeGen/ISDOpcodes.h llvm/include/llvm/CodeGen/TargetLowering.h llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp llvm/lib/CodeGen/TargetLoweringBase.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 54c71c2634..131e9e7820 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
@@ -1888,7 +1888,9 @@ bool DAGTypeLegalizer::PromoteIntegerOperand(SDNode *N, unsigned OpNo) {
   case ISD::ROTR: Res = PromoteIntOp_Shift(N); break;
 
   case ISD::SCMP:
-  case ISD::UCMP: Res = PromoteIntOp_CMP(N); break;
+  case ISD::UCMP:
+    Res = PromoteIntOp_CMP(N);
+    break;
 
   case ISD::FSHL:
   case ISD::FSHR: Res = PromoteIntOp_FunnelShift(N); break;
@@ -2769,7 +2771,9 @@ void DAGTypeLegalizer::ExpandIntegerResult(SDNode *N, unsigned ResNo) {
   case ISD::SMIN: ExpandIntRes_MINMAX(N, Lo, Hi); break;
 
   case ISD::SCMP:
-  case ISD::UCMP: ExpandIntRes_CMP(N, Lo, Hi); break;
+  case ISD::UCMP:
+    ExpandIntRes_CMP(N, Lo, Hi);
+    break;
 
   case ISD::ADD:
   case ISD::SUB: ExpandIntRes_ADDSUB(N, Lo, Hi); break;
@@ -5172,7 +5176,9 @@ bool DAGTypeLegalizer::ExpandIntegerOperand(SDNode *N, unsigned OpNo) {
   case ISD::FRAMEADDR:         Res = ExpandIntOp_RETURNADDR(N); break;
 
   case ISD::SCMP:
-  case ISD::UCMP:              Res = ExpandIntOp_CMP(N); break;
+  case ISD::UCMP:
+    Res = ExpandIntOp_CMP(N);
+    break;
 
   case ISD::ATOMIC_STORE:      Res = ExpandIntOp_ATOMIC_STORE(N); break;
   case ISD::STACKMAP:
diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h b/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h
index 035f16720c..75b752ef3a 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h
@@ -459,7 +459,7 @@ private:
 
   void ExpandIntRes_MINMAX            (SDNode *N, SDValue &Lo, SDValue &Hi);
 
-  void ExpandIntRes_CMP               (SDNode *N, SDValue &Lo, SDValue &Hi);
+  void ExpandIntRes_CMP(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/91871