diff --git a/llvm/lib/Target/AArch64/GISel/AArch64PreLegalizerCombiner.cpp b/llvm/lib/Target/AArch64/GISel/AArch64PreLegalizerCombiner.cpp
index 6496d56d74b2c..2c559d4beb5d1 100644
--- a/llvm/lib/Target/AArch64/GISel/AArch64PreLegalizerCombiner.cpp
+++ b/llvm/lib/Target/AArch64/GISel/AArch64PreLegalizerCombiner.cpp
@@ -482,9 +482,7 @@ void applyExtUaddvToUaddlv(MachineInstr &MI, MachineRegisterInfo &MRI,
     // the values inside a small vec
     extractParts(SrcReg, SrcTy, MainTy, LeftoverTy, WorkingRegisters,
                  LeftoverRegs, B, MRI);
-    for (unsigned I = 0; I < LeftoverRegs.size(); I++) {
-      WorkingRegisters.push_back(LeftoverRegs[I]);
-    }
+    llvm::append_range(WorkingRegisters, LeftoverRegs);
   } else {
     WorkingRegisters.push_back(SrcReg);
     MainTy = SrcTy;
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUSwLowerLDS.cpp b/llvm/lib/Target/AMDGPU/AMDGPUSwLowerLDS.cpp
index f9facfa461748..70274a8101f89 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUSwLowerLDS.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUSwLowerLDS.cpp
@@ -1265,9 +1265,7 @@ bool AMDGPUSwLowerLDS::run() {
     for (Instruction *Inst : AsanInfo.Instructions) {
       SmallVector<InterestingMemoryOperand, 1> InterestingOperands;
       getInterestingMemoryOperands(M, Inst, InterestingOperands);
-      for (auto &Operand : InterestingOperands) {
-        OperandsToInstrument.push_back(Operand);
-      }
+      llvm::append_range(OperandsToInstrument, InterestingOperands);
     }
     for (auto &Operand : OperandsToInstrument) {
       Value *Addr = Operand.getPtr();
diff --git a/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp b/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
index 71fe990e5ab7c..6843ec895e69c 100644
--- a/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
@@ -6907,8 +6907,7 @@ bool ARMPipelinerLoopInfo::tooMuchRegisterPressure(SwingSchedulerDAG &SSD,
           SMS.getInstructions(Cycle + Stage * SMS.getInitiationInterval());
       std::sort(Instrs.begin(), Instrs.end(),
                 [](SUnit *A, SUnit *B) { return A->NodeNum > B->NodeNum; });
-      for (SUnit *SU : Instrs)
-        ProposedSchedule.push_back(SU);
+      llvm::append_range(ProposedSchedule, Instrs);
     }
 
   // Learn whether the last use/def of each cross-iteration register is a use or
diff --git a/llvm/lib/Target/ARM/MVETPAndVPTOptimisationsPass.cpp b/llvm/lib/Target/ARM/MVETPAndVPTOptimisationsPass.cpp
index 12fd8c7924565..18d5c232378a7 100644
--- a/llvm/lib/Target/ARM/MVETPAndVPTOptimisationsPass.cpp
+++ b/llvm/lib/Target/ARM/MVETPAndVPTOptimisationsPass.cpp
@@ -303,8 +303,7 @@ MachineInstr *MVETPAndVPTOptimisations::CheckForLRUseInPredecessors(
     }
 
     Visited.insert(MBB);
-    for (auto *Pred : MBB->predecessors())
-      Worklist.push_back(Pred);
+    llvm::append_range(Worklist, MBB->predecessors());
   }
   return LoopStart;
 }
diff --git a/llvm/lib/Target/DirectX/DXILDataScalarization.cpp b/llvm/lib/Target/DirectX/DXILDataScalarization.cpp
index a0dd17904f6fa..1f2700ac55647 100644
--- a/llvm/lib/Target/DirectX/DXILDataScalarization.cpp
+++ b/llvm/lib/Target/DirectX/DXILDataScalarization.cpp
@@ -144,9 +144,7 @@ bool DataScalarizerVisitor::visitGetElementPtrInst(GetElementPtrInst &GEPI) {
     return false;
 
   IRBuilder<> Builder(&GEPI);
-  SmallVector<Value *, MaxVecSize> Indices;
-  for (auto &Index : GEPI.indices())
-    Indices.push_back(Index);
+  SmallVector<Value *, MaxVecSize> Indices(GEPI.indices());
 
   Value *NewGEP =
       Builder.CreateGEP(NewGlobal->getValueType(), NewGlobal, Indices,
diff --git a/llvm/lib/Target/Hexagon/HexagonISelDAGToDAGHVX.cpp b/llvm/lib/Target/Hexagon/HexagonISelDAGToDAGHVX.cpp
index dd054846f03c8..02b0282bbddad 100644
--- a/llvm/lib/Target/Hexagon/HexagonISelDAGToDAGHVX.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonISelDAGToDAGHVX.cpp
@@ -1062,8 +1062,7 @@ static SmallVector<unsigned, 4> getInputSegmentList(ShuffleMask SM,
       Segs.set(M >> Shift);
   }
 
-  for (unsigned B : Segs.set_bits())
-    SegList.push_back(B);
+  llvm::append_range(SegList, Segs.set_bits());
   return SegList;
 }
 
diff --git a/llvm/lib/Target/SPIRV/SPIRVEmitIntrinsics.cpp b/llvm/lib/Target/SPIRV/SPIRVEmitIntrinsics.cpp
index 939d9e920d05b..900bb1a8a46d2 100644
--- a/llvm/lib/Target/SPIRV/SPIRVEmitIntrinsics.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVEmitIntrinsics.cpp
@@ -1241,8 +1241,7 @@ void SPIRVEmitIntrinsics::preprocessCompositeConstants(IRBuilder<> &B) {
           for (unsigned i = 0; i < COp->getNumElements(); ++i)
             Args.push_back(COp->getElementAsConstant(i));
         else
-          for (auto &COp : AggrConst->operands())
-            Args.push_back(COp);
+          llvm::append_range(Args, AggrConst->operands());
         if (!BPrepared) {
           IsPhi ? B.SetInsertPointPastAllocas(I->getParent()->getParent())
                 : B.SetInsertPoint(I);
@@ -1387,8 +1386,7 @@ Instruction *SPIRVEmitIntrinsics::visitGetElementPtrInst(GetElementPtrInst &I) {
   SmallVector<Type *, 2> Types = {I.getType(), I.getOperand(0)->getType()};
   SmallVector<Value *, 4> Args;
   Args.push_back(B.getInt1(I.isInBounds()));
-  for (auto &Op : I.operands())
-    Args.push_back(Op);
+  llvm::append_range(Args, I.operands());
   auto *NewI = B.CreateIntrinsic(Intrinsic::spv_gep, {Types}, {Args});
   replaceAllUsesWithAndErase(B, &I, NewI);
   return NewI;
@@ -1716,9 +1714,7 @@ Instruction *SPIRVEmitIntrinsics::visitExtractValueInst(ExtractValueInst &I) {
     return &I;
   IRBuilder<> B(I.getParent());
   B.SetInsertPoint(&I);
-  SmallVector<Value *> Args;
-  for (auto &Op : I.operands())
-    Args.push_back(Op);
+  SmallVector<Value *> Args(I.operands());
   for (auto &Op : I.indices())
     Args.push_back(B.getInt32(Op));
   auto *NewI =
@@ -1794,9 +1790,7 @@ Instruction *SPIRVEmitIntrinsics::visitAtomicCmpXchgInst(AtomicCmpXchgInst &I) {
   assert(I.getType()->isAggregateType() && "Aggregate result is expected");
   IRBuilder<> B(I.getParent());
   B.SetInsertPoint(&I);
-  SmallVector<Value *> Args;
-  for (auto &Op : I.operands())
-    Args.push_back(Op);
+  SmallVector<Value *> Args(I.operands());
   Args.push_back(B.getInt32(
       static_cast<uint32_t>(getMemScope(I.getContext(), I.getSyncScopeID()))));
   Args.push_back(B.getInt32(
diff --git a/llvm/lib/Target/SPIRV/SPIRVUtils.cpp b/llvm/lib/Target/SPIRV/SPIRVUtils.cpp
index 6bef6b7e9b16e..60b67a4f5ec5e 100644
--- a/llvm/lib/Target/SPIRV/SPIRVUtils.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVUtils.cpp
@@ -689,8 +689,7 @@ bool sortBlocks(Function &F) {
   Order.reserve(F.size());
 
   ReversePostOrderTraversal<Function *> RPOT(&F);
-  for (BasicBlock *BB : RPOT)
-    Order.push_back(BB);
+  llvm::append_range(Order, RPOT);
 
   assert(&*F.begin() == Order[0]);
   BasicBlock *LastBlock = &*F.begin();
@@ -785,8 +784,7 @@ CallInst *buildIntrWithMD(Intrinsic::ID IntrID, ArrayRef<Type *> Types,
   SmallVector<Value *, 4> Args;
   Args.push_back(Arg2);
   Args.push_back(buildMD(Arg));
-  for (auto *Imm : Imms)
-    Args.push_back(Imm);
+  llvm::append_range(Args, Imms);
   return B.CreateIntrinsic(IntrID, {Types}, Args);
 }
 
diff --git a/llvm/lib/Target/X86/X86CmovConversion.cpp b/llvm/lib/Target/X86/X86CmovConversion.cpp
index d639ca56b77d6..488b3126b8609 100644
--- a/llvm/lib/Target/X86/X86CmovConversion.cpp
+++ b/llvm/lib/Target/X86/X86CmovConversion.cpp
@@ -240,8 +240,7 @@ bool X86CmovConverterPass::runOnMachineFunction(MachineFunction &MF) {
   // Note that we need to check size on each iteration as we accumulate child
   // loops.
   for (int i = 0; i < (int)Loops.size(); ++i)
-    for (MachineLoop *Child : Loops[i]->getSubLoops())
-      Loops.push_back(Child);
+    llvm::append_range(Loops, Loops[i]->getSubLoops());
 
   for (MachineLoop *CurrLoop : Loops) {
     // Optimize only innermost loops.
diff --git a/llvm/lib/Target/X86/X86InterleavedAccess.cpp b/llvm/lib/Target/X86/X86InterleavedAccess.cpp
index efab93d61c7c5..1eb47e3b2cd18 100644
--- a/llvm/lib/Target/X86/X86InterleavedAccess.cpp
+++ b/llvm/lib/Target/X86/X86InterleavedAccess.cpp
@@ -829,10 +829,8 @@ bool X86TargetLowering::lowerInterleavedStore(StoreInst *SI,
 
   // Holds the indices of SVI that correspond to the starting index of each
   // interleaved shuffle.
-  SmallVector<unsigned, 4> Indices;
   auto Mask = SVI->getShuffleMask();
-  for (unsigned i = 0; i < Factor; i++)
-    Indices.push_back(Mask[i]);
+  SmallVector<unsigned, 4> Indices(Mask.take_front(Factor));
 
   ArrayRef<ShuffleVectorInst *> Shuffles = ArrayRef(SVI);
 
diff --git a/llvm/lib/Target/X86/X86WinEHState.cpp b/llvm/lib/Target/X86/X86WinEHState.cpp
index 7d6d3f8d21f25..1bcbc7d6e6703 100644
--- a/llvm/lib/Target/X86/X86WinEHState.cpp
+++ b/llvm/lib/Target/X86/X86WinEHState.cpp
@@ -721,8 +721,7 @@ void WinEHStatePass::addStateStores(Function &F, WinEHFuncInfo &FuncInfo) {
     // enqueue it's successors to see if we can infer their states.
     InitialStates.insert({BB, PredState});
     FinalStates.insert({BB, PredState});
-    for (BasicBlock *SuccBB : successors(BB))
-      Worklist.push_back(SuccBB);
+    llvm::append_range(Worklist, successors(BB));
   }
 
   // Try to hoist stores from successors.