[MIR][NFC] Use std::move to avoid copying (#125930)

Author: abhishek-kaushik22

llvm/lib/CodeGen/MIRPrinter.cpp

@@ -452,7 +452,7 @@ void MIRPrinter::convertStackObjects(yaml::MachineFunction &YMF,
     YamlObject.IsAliased = MFI.isAliasedObjectIndex(I);
     // Save the ID' position in FixedStackObjects storage vector.
     FixedStackObjectsIdx[ID] = YMF.FixedStackObjects.size();
-    YMF.FixedStackObjects.push_back(YamlObject);
+    YMF.FixedStackObjects.push_back(std::move(YamlObject));
     StackObjectOperandMapping.insert(
         std::make_pair(I, FrameIndexOperand::createFixed(ID)));
   }
@@ -506,11 +506,11 @@ void MIRPrinter::convertStackObjects(yaml::MachineFunction &YMF,
         auto &Object =
             YMF.FixedStackObjects
                 [FixedStackObjectsIdx[FrameIdx + MFI.getNumFixedObjects()]];
-        Object.CalleeSavedRegister = Reg;
+        Object.CalleeSavedRegister = std::move(Reg);
         Object.CalleeSavedRestored = CSInfo.isRestored();
       } else {
         auto &Object = YMF.StackObjects[StackObjectsIdx[FrameIdx]];
-        Object.CalleeSavedRegister = Reg;
+        Object.CalleeSavedRegister = std::move(Reg);
         Object.CalleeSavedRestored = CSInfo.isRestored();
       }
     }
@@ -576,7 +576,7 @@ void MIRPrinter::convertCallSiteObjects(yaml::MachineFunction &YMF,
       printRegMIR(ArgReg.Reg, YmlArgReg.Reg, TRI);
       YmlCS.ArgForwardingRegs.emplace_back(YmlArgReg);
     }
-    YMF.CallSitesInfo.push_back(YmlCS);
+    YMF.CallSitesInfo.push_back(std::move(YmlCS));
   }
 
   // Sort call info by position of call instructions.
@@ -597,7 +597,7 @@ void MIRPrinter::convertMachineMetadataNodes(yaml::MachineFunction &YMF,
     std::string NS;
     raw_string_ostream StrOS(NS);
     MD.second->print(StrOS, MST, MF.getFunction().getParent());
-    YMF.MachineMetadataNodes.push_back(NS);
+    YMF.MachineMetadataNodes.push_back(std::move(NS));
   }
 }
 
@@ -612,7 +612,7 @@ void MIRPrinter::convertCalledGlobals(yaml::MachineFunction &YMF,
 
     yaml::CalledGlobal YamlCG{CallSite, CG.Callee->getName().str(),
                               CG.TargetFlags};
-    YMF.CalledGlobals.push_back(YamlCG);
+    YMF.CalledGlobals.push_back(std::move(YamlCG));
   }
 
   // Sort by position of call instructions.
@@ -638,11 +638,11 @@ void MIRPrinter::convert(yaml::MachineFunction &MF,
 
     yaml::MachineConstantPoolValue YamlConstant;
     YamlConstant.ID = ID++;
-    YamlConstant.Value = Str;
+    YamlConstant.Value = std::move(Str);
     YamlConstant.Alignment = Constant.getAlign();
     YamlConstant.IsTargetSpecific = Constant.isMachineConstantPoolEntry();
 
-    MF.Constants.push_back(YamlConstant);
+    MF.Constants.push_back(std::move(YamlConstant));
   }
 }
 
@@ -661,7 +661,7 @@ void MIRPrinter::convert(ModuleSlotTracker &MST,
       Entry.Blocks.push_back(Str);
       Str.clear();
     }
-    YamlJTI.Entries.push_back(Entry);
+    YamlJTI.Entries.push_back(std::move(Entry));
   }
 }
 

llvm/lib/CodeGen/MachineFunction.cpp

@@ -967,13 +967,13 @@ void MachineFunction::copyAdditionalCallInfo(const MachineInstr *Old,
   CallSiteInfoMap::iterator CSIt = getCallSiteInfo(OldCallMI);
   if (CSIt != CallSitesInfo.end()) {
     CallSiteInfo CSInfo = CSIt->second;
-    CallSitesInfo[New] = CSInfo;
+    CallSitesInfo[New] = std::move(CSInfo);
   }
 
   CalledGlobalsMap::iterator CGIt = CalledGlobalsInfo.find(OldCallMI);
   if (CGIt != CalledGlobalsInfo.end()) {
     CalledGlobalInfo CGInfo = CGIt->second;
-    CalledGlobalsInfo[New] = CGInfo;
+    CalledGlobalsInfo[New] = std::move(CGInfo);
   }
 }
 
@@ -991,14 +991,14 @@ void MachineFunction::moveAdditionalCallInfo(const MachineInstr *Old,
   if (CSIt != CallSitesInfo.end()) {
     CallSiteInfo CSInfo = std::move(CSIt->second);
     CallSitesInfo.erase(CSIt);
-    CallSitesInfo[New] = CSInfo;
+    CallSitesInfo[New] = std::move(CSInfo);
   }
 
   CalledGlobalsMap::iterator CGIt = CalledGlobalsInfo.find(OldCallMI);
   if (CGIt != CalledGlobalsInfo.end()) {
     CalledGlobalInfo CGInfo = std::move(CGIt->second);
     CalledGlobalsInfo.erase(CGIt);
-    CalledGlobalsInfo[New] = CGInfo;
+    CalledGlobalsInfo[New] = std::move(CGInfo);
   }
 }