diff --git a/llvm/lib/Transforms/IPO/MemProfContextDisambiguation.cpp b/llvm/lib/Transforms/IPO/MemProfContextDisambiguation.cpp
index f5ae204426170..df1f6fddeba60 100644
--- a/llvm/lib/Transforms/IPO/MemProfContextDisambiguation.cpp
+++ b/llvm/lib/Transforms/IPO/MemProfContextDisambiguation.cpp
@@ -2286,8 +2286,7 @@ void CallsiteContextGraph<DerivedCCG, FuncTy,
     std::vector<CallInfo> AllCalls;
     AllCalls.reserve(Node->MatchingCalls.size() + 1);
     AllCalls.push_back(Node->Call);
-    AllCalls.insert(AllCalls.end(), Node->MatchingCalls.begin(),
-                    Node->MatchingCalls.end());
+    llvm::append_range(AllCalls, Node->MatchingCalls);
 
     // First see if we can partition the calls by callee function, creating new
     // nodes to host each set of calls calling the same callees. This is
@@ -2468,9 +2467,8 @@ bool CallsiteContextGraph<DerivedCCG, FuncTy, CallTy>::partitionCallsByCallee(
         // The first call becomes the primary call for this caller node, and the
         // rest go in the matching calls list.
         Info->Node->setCall(Info->Calls.front());
-        Info->Node->MatchingCalls.insert(Info->Node->MatchingCalls.end(),
-                                         Info->Calls.begin() + 1,
-                                         Info->Calls.end());
+        llvm::append_range(Info->Node->MatchingCalls,
+                           llvm::drop_begin(Info->Calls));
         // Save the primary call to node correspondence so that we can update
         // the NonAllocationCallToContextNodeMap, which is being iterated in the
         // caller of this function.
@@ -4117,8 +4115,7 @@ bool CallsiteContextGraph<DerivedCCG, FuncTy, CallTy>::assignFunctions() {
       // Ignore original Node if we moved all of its contexts to clones.
       if (!Node->emptyContextIds())
         ClonesWorklist.push_back(Node);
-      ClonesWorklist.insert(ClonesWorklist.end(), Node->Clones.begin(),
-                            Node->Clones.end());
+      llvm::append_range(ClonesWorklist, Node->Clones);
 
       // Now walk through all of the clones of this callsite Node that we need,
       // and determine the assignment to a corresponding clone of the current
diff --git a/llvm/lib/Transforms/Scalar/DFAJumpThreading.cpp b/llvm/lib/Transforms/Scalar/DFAJumpThreading.cpp
index 82434680b8f23..938aab5879044 100644
--- a/llvm/lib/Transforms/Scalar/DFAJumpThreading.cpp
+++ b/llvm/lib/Transforms/Scalar/DFAJumpThreading.cpp
@@ -399,7 +399,7 @@ struct ThreadingPath {
   void push_back(BasicBlock *BB) { Path.push_back(BB); }
   void push_front(BasicBlock *BB) { Path.push_front(BB); }
   void appendExcludingFirst(const PathType &OtherPath) {
-    Path.insert(Path.end(), OtherPath.begin() + 1, OtherPath.end());
+    llvm::append_range(Path, llvm::drop_begin(OtherPath));
   }
 
   void print(raw_ostream &OS) const {
diff --git a/llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp b/llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp
index 4f7956514b7b5..4c6f6f12d7138 100644
--- a/llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp
+++ b/llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp
@@ -3641,14 +3641,12 @@ static bool unswitchLoop(Loop &L, DominatorTree &DT, LoopInfo &LI,
     }
     // Next check all loops nested within L.
     SmallVector<const Loop *, 4> Worklist;
-    Worklist.insert(Worklist.end(), L->getSubLoops().begin(),
-                    L->getSubLoops().end());
+    llvm::append_range(Worklist, L->getSubLoops());
     while (!Worklist.empty()) {
       auto *CurLoop = Worklist.pop_back_val();
       if (!PSI->isColdBlock(CurLoop->getHeader(), BFI))
         return false;
-      Worklist.insert(Worklist.end(), CurLoop->getSubLoops().begin(),
-                      CurLoop->getSubLoops().end());
+      llvm::append_range(Worklist, CurLoop->getSubLoops());
     }
     return true;
   };
diff --git a/llvm/lib/Transforms/Utils/CodeLayout.cpp b/llvm/lib/Transforms/Utils/CodeLayout.cpp
index baaad8bb48f33..c76b3afef50c2 100644
--- a/llvm/lib/Transforms/Utils/CodeLayout.cpp
+++ b/llvm/lib/Transforms/Utils/CodeLayout.cpp
@@ -387,7 +387,7 @@ struct ChainEdge {
   void appendJump(JumpT *Jump) { Jumps.push_back(Jump); }
 
   void moveJumps(ChainEdge *Other) {
-    Jumps.insert(Jumps.end(), Other->Jumps.begin(), Other->Jumps.end());
+    llvm::append_range(Jumps, Other->Jumps);
     Other->Jumps.clear();
     Other->Jumps.shrink_to_fit();
   }
diff --git a/llvm/lib/Transforms/Utils/SampleProfileInference.cpp b/llvm/lib/Transforms/Utils/SampleProfileInference.cpp
index 54d46117729c9..53bcaa6d3df03 100644
--- a/llvm/lib/Transforms/Utils/SampleProfileInference.cpp
+++ b/llvm/lib/Transforms/Utils/SampleProfileInference.cpp
@@ -672,8 +672,8 @@ class FlowAdjuster {
 
     // Concatenate the two paths
     std::vector<FlowJump *> Result;
-    Result.insert(Result.end(), ForwardPath.begin(), ForwardPath.end());
-    Result.insert(Result.end(), BackwardPath.begin(), BackwardPath.end());
+    llvm::append_range(Result, ForwardPath);
+    llvm::append_range(Result, BackwardPath);
     return Result;
   }