[MCSchedule] Simplify and remove a C++20-deprecated is_pod call. NFC

Author: MaskRay

llvm/include/llvm/CodeGen/TargetSchedule.h

@@ -46,7 +46,7 @@ class TargetSchedModel {
   unsigned computeInstrLatency(const MCSchedClassDesc &SCDesc) const;
 
 public:
-  TargetSchedModel() : SchedModel(MCSchedModel::GetDefaultSchedModel()) {}
+  TargetSchedModel() : SchedModel(MCSchedModel::Default) {}
 
   /// Initialize the machine model for instruction scheduling.
   ///

llvm/include/llvm/MC/MCInstrItineraries.h

@@ -110,8 +110,8 @@ struct InstrItinerary {
 class InstrItineraryData {
 public:
   MCSchedModel SchedModel =
-      MCSchedModel::GetDefaultSchedModel(); ///< Basic machine properties.
-  const InstrStage *Stages = nullptr;       ///< Array of stages selected
+      MCSchedModel::Default;               ///< Basic machine properties.
+  const InstrStage *Stages = nullptr;      ///< Array of stages selected
   const unsigned *OperandCycles = nullptr; ///< Array of operand cycles selected
   const unsigned *Forwardings = nullptr; ///< Array of pipeline forwarding paths
   const InstrItinerary *Itineraries =

llvm/include/llvm/MC/MCSchedule.h

@@ -390,7 +390,6 @@ struct MCSchedModel {
                                            unsigned WriteResourceIdx = 0);
 
   /// Returns the default initialized model.
-  static const MCSchedModel &GetDefaultSchedModel() { return Default; }
   static const MCSchedModel Default;
 };
 

llvm/lib/MC/MCSchedule.cpp

@@ -20,8 +20,8 @@
 
 using namespace llvm;
 
-static_assert(std::is_pod<MCSchedModel>::value,
-              "We shouldn't have a static constructor here");
+static_assert(std::is_trivial_v<MCSchedModel>,
+              "MCSchedModel is required to be a trivial type");
 const MCSchedModel MCSchedModel::Default = {DefaultIssueWidth,
                                             DefaultMicroOpBufferSize,
                                             DefaultLoopMicroOpBufferSize,
@@ -30,7 +30,7 @@ const MCSchedModel MCSchedModel::Default = {DefaultIssueWidth,
                                             DefaultMispredictPenalty,
                                             false,
                                             true,
-                                            false /*EnableIntervals*/,
+                                            /*EnableIntervals=*/false,
                                             0,
                                             nullptr,
                                             nullptr,

llvm/lib/MC/MCSubtargetInfo.cpp

@@ -214,7 +214,7 @@ void MCSubtargetInfo::InitMCProcessorInfo(StringRef CPU, StringRef TuneCPU,
   if (!TuneCPU.empty())
     CPUSchedModel = &getSchedModelForCPU(TuneCPU);
   else
-    CPUSchedModel = &MCSchedModel::GetDefaultSchedModel();
+    CPUSchedModel = &MCSchedModel::Default;
 }
 
 void MCSubtargetInfo::setDefaultFeatures(StringRef CPU, StringRef TuneCPU,
@@ -319,7 +319,7 @@ const MCSchedModel &MCSubtargetInfo::getSchedModelForCPU(StringRef CPU) const {
       errs() << "'" << CPU
              << "' is not a recognized processor for this target"
              << " (ignoring processor)\n";
-    return MCSchedModel::GetDefaultSchedModel();
+    return MCSchedModel::Default;
   }
   assert(CPUEntry->SchedModel && "Missing processor SchedModel value");
   return *CPUEntry->SchedModel;