diff --git a/llvm/include/llvm/Transforms/IPO/Attributor.h b/llvm/include/llvm/Transforms/IPO/Attributor.h
index 34557238ecb23c..ad3c6426efd2fe 100644
--- a/llvm/include/llvm/Transforms/IPO/Attributor.h
+++ b/llvm/include/llvm/Transforms/IPO/Attributor.h
@@ -2247,7 +2247,7 @@ struct Attributor {
                             CalleeRepairCBTy &&CalleeRepairCB,
                             ACSRepairCBTy &&ACSRepairCB)
         : A(A), ReplacedFn(*Arg.getParent()), ReplacedArg(Arg),
-          ReplacementTypes(ReplacementTypes.begin(), ReplacementTypes.end()),
+          ReplacementTypes(ReplacementTypes),
           CalleeRepairCB(std::move(CalleeRepairCB)),
           ACSRepairCB(std::move(ACSRepairCB)) {}
 
diff --git a/llvm/lib/Transforms/Coroutines/CoroSplit.cpp b/llvm/lib/Transforms/Coroutines/CoroSplit.cpp
index 9e4da5f8ca9615..8eceaef59a1e1f 100644
--- a/llvm/lib/Transforms/Coroutines/CoroSplit.cpp
+++ b/llvm/lib/Transforms/Coroutines/CoroSplit.cpp
@@ -1605,7 +1605,7 @@ struct SwitchCoroutineSplitter {
                           ArrayRef<Function *> Fns) {
     // This only works under the switch-lowering ABI because coro elision
     // only works on the switch-lowering ABI.
-    SmallVector<Constant *, 4> Args(Fns.begin(), Fns.end());
+    SmallVector<Constant *, 4> Args(Fns);
     assert(!Args.empty());
     Function *Part = *Fns.begin();
     Module *M = Part->getParent();
diff --git a/llvm/lib/Transforms/IPO/PartialInlining.cpp b/llvm/lib/Transforms/IPO/PartialInlining.cpp
index 3ca095e1520f3b..28c81465a09489 100644
--- a/llvm/lib/Transforms/IPO/PartialInlining.cpp
+++ b/llvm/lib/Transforms/IPO/PartialInlining.cpp
@@ -170,11 +170,10 @@ struct FunctionOutliningMultiRegionInfo {
 
   // Container for outline regions
   struct OutlineRegionInfo {
-    OutlineRegionInfo(ArrayRef<BasicBlock *> Region,
-                      BasicBlock *EntryBlock, BasicBlock *ExitBlock,
-                      BasicBlock *ReturnBlock)
-        : Region(Region.begin(), Region.end()), EntryBlock(EntryBlock),
-          ExitBlock(ExitBlock), ReturnBlock(ReturnBlock) {}
+    OutlineRegionInfo(ArrayRef<BasicBlock *> Region, BasicBlock *EntryBlock,
+                      BasicBlock *ExitBlock, BasicBlock *ReturnBlock)
+        : Region(Region), EntryBlock(EntryBlock), ExitBlock(ExitBlock),
+          ReturnBlock(ReturnBlock) {}
     SmallVector<BasicBlock *, 8> Region;
     BasicBlock *EntryBlock;
     BasicBlock *ExitBlock;
diff --git a/llvm/lib/Transforms/Instrumentation/ControlHeightReduction.cpp b/llvm/lib/Transforms/Instrumentation/ControlHeightReduction.cpp
index c2affafa49e519..810cbbda66085a 100644
--- a/llvm/lib/Transforms/Instrumentation/ControlHeightReduction.cpp
+++ b/llvm/lib/Transforms/Instrumentation/ControlHeightReduction.cpp
@@ -281,8 +281,7 @@ class CHRScope {
 
  private:
    CHRScope(ArrayRef<RegInfo> RegInfosIn, ArrayRef<CHRScope *> SubsIn)
-       : RegInfos(RegInfosIn.begin(), RegInfosIn.end()),
-         Subs(SubsIn.begin(), SubsIn.end()), BranchInsertPoint(nullptr) {}
+       : RegInfos(RegInfosIn), Subs(SubsIn), BranchInsertPoint(nullptr) {}
 };
 
 class CHR {
diff --git a/llvm/lib/Transforms/Scalar/LoopInterchange.cpp b/llvm/lib/Transforms/Scalar/LoopInterchange.cpp
index 400973fd9fc915..949296c3db0de2 100644
--- a/llvm/lib/Transforms/Scalar/LoopInterchange.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopInterchange.cpp
@@ -383,7 +383,7 @@ struct LoopInterchange {
   }
 
   bool run(LoopNest &LN) {
-    SmallVector<Loop *, 8> LoopList(LN.getLoops().begin(), LN.getLoops().end());
+    SmallVector<Loop *, 8> LoopList(LN.getLoops());
     for (unsigned I = 1; I < LoopList.size(); ++I)
       if (LoopList[I]->getParentLoop() != LoopList[I - 1])
         return false;
diff --git a/llvm/lib/Transforms/Scalar/LowerMatrixIntrinsics.cpp b/llvm/lib/Transforms/Scalar/LowerMatrixIntrinsics.cpp
index 6a681fd9339717..d0a83a8242ddc0 100644
--- a/llvm/lib/Transforms/Scalar/LowerMatrixIntrinsics.cpp
+++ b/llvm/lib/Transforms/Scalar/LowerMatrixIntrinsics.cpp
@@ -362,7 +362,7 @@ class LowerMatrixIntrinsics {
   public:
     MatrixTy() : IsColumnMajor(MatrixLayout == MatrixLayoutTy::ColumnMajor) {}
     MatrixTy(ArrayRef<Value *> Vectors)
-        : Vectors(Vectors.begin(), Vectors.end()),
+        : Vectors(Vectors),
           IsColumnMajor(MatrixLayout == MatrixLayoutTy::ColumnMajor) {}
     MatrixTy(unsigned NumRows, unsigned NumColumns, Type *EltTy)
         : IsColumnMajor(MatrixLayout == MatrixLayoutTy::ColumnMajor) {
diff --git a/llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp b/llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp
index 56aa96e550d9c3..2d74b2b8d1d2fd 100644
--- a/llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp
+++ b/llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp
@@ -971,8 +971,7 @@ bool llvm::UnrollRuntimeLoopRemainder(
     // (e.g. breakLoopBackedgeAndSimplify) and reused in loop-deletion.
     BasicBlock *RemainderLatch = remainderLoop->getLoopLatch();
     assert(RemainderLatch);
-    SmallVector<BasicBlock*> RemainderBlocks(remainderLoop->getBlocks().begin(),
-                                             remainderLoop->getBlocks().end());
+    SmallVector<BasicBlock *> RemainderBlocks(remainderLoop->getBlocks());
     breakLoopBackedge(remainderLoop, *DT, *SE, *LI, nullptr);
     remainderLoop = nullptr;
 
diff --git a/llvm/lib/Transforms/Utils/LoopVersioning.cpp b/llvm/lib/Transforms/Utils/LoopVersioning.cpp
index c43c92a6b4d5d3..af2ed6240f7220 100644
--- a/llvm/lib/Transforms/Utils/LoopVersioning.cpp
+++ b/llvm/lib/Transforms/Utils/LoopVersioning.cpp
@@ -42,10 +42,8 @@ LoopVersioning::LoopVersioning(const LoopAccessInfo &LAI,
                                ArrayRef<RuntimePointerCheck> Checks, Loop *L,
                                LoopInfo *LI, DominatorTree *DT,
                                ScalarEvolution *SE)
-    : VersionedLoop(L), AliasChecks(Checks.begin(), Checks.end()),
-      Preds(LAI.getPSE().getPredicate()), LAI(LAI), LI(LI), DT(DT),
-      SE(SE) {
-}
+    : VersionedLoop(L), AliasChecks(Checks), Preds(LAI.getPSE().getPredicate()),
+      LAI(LAI), LI(LI), DT(DT), SE(SE) {}
 
 void LoopVersioning::versionLoop(
     const SmallVectorImpl<Instruction *> &DefsUsedOutside) {
diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index 6daa8043a3fbf9..40d10395de17d4 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -8219,7 +8219,7 @@ VPWidenRecipe *VPRecipeBuilder::tryToWiden(Instruction *I,
     // If not provably safe, use a select to form a safe divisor before widening the
     // div/rem operation itself.  Otherwise fall through to general handling below.
     if (CM.isPredicatedInst(I)) {
-      SmallVector<VPValue *> Ops(Operands.begin(), Operands.end());
+      SmallVector<VPValue *> Ops(Operands);
       VPValue *Mask = getBlockInMask(I->getParent());
       VPValue *One =
           Plan.getOrAddLiveIn(ConstantInt::get(I->getType(), 1u, false));
diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index cd273429e6e67e..305efb732d8f7e 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -1575,7 +1575,7 @@ class BoUpSLP {
       if (I1 && I2) {
         if (I1->getParent() != I2->getParent())
           return CheckSameEntryOrFail();
-        SmallVector<Value *, 4> Ops(MainAltOps.begin(), MainAltOps.end());
+        SmallVector<Value *, 4> Ops(MainAltOps);
         Ops.push_back(I1);
         Ops.push_back(I2);
         InstructionsState S = getSameOpcode(Ops, TLI);
@@ -5236,7 +5236,7 @@ void BoUpSLP::reorderNodeWithReuses(TreeEntry &TE, ArrayRef<int> Mask) const {
   TE.ReorderIndices.clear();
   // Try to improve gathered nodes with clustered reuses, if possible.
   ArrayRef<int> Slice = ArrayRef(NewMask).slice(0, Sz);
-  SmallVector<unsigned> NewOrder(Slice.begin(), Slice.end());
+  SmallVector<unsigned> NewOrder(Slice);
   inversePermutation(NewOrder, NewMask);
   reorderScalars(TE.Scalars, NewMask);
   // Fill the reuses mask with the identity submasks.
@@ -7916,8 +7916,7 @@ class BaseShuffleAnalysis {
         }
         break;
       }
-      SmallVector<int> ShuffleMask(SV->getShuffleMask().begin(),
-                                   SV->getShuffleMask().end());
+      SmallVector<int> ShuffleMask(SV->getShuffleMask());
       combineMasks(LocalVF, ShuffleMask, Mask);
       Mask.swap(ShuffleMask);
       if (IsOp2Undef)
@@ -8017,15 +8016,13 @@ class BaseShuffleAnalysis {
                 isUndefVector(SV2->getOperand(1), UseMask2).all()) {
               Op1 = SV1->getOperand(0);
               Op2 = SV2->getOperand(0);
-              SmallVector<int> ShuffleMask1(SV1->getShuffleMask().begin(),
-                                            SV1->getShuffleMask().end());
+              SmallVector<int> ShuffleMask1(SV1->getShuffleMask());
               int LocalVF = ShuffleMask1.size();
               if (auto *FTy = dyn_cast<FixedVectorType>(Op1->getType()))
                 LocalVF = FTy->getNumElements();
               combineMasks(LocalVF, ShuffleMask1, CombinedMask1);
               CombinedMask1.swap(ShuffleMask1);
-              SmallVector<int> ShuffleMask2(SV2->getShuffleMask().begin(),
-                                            SV2->getShuffleMask().end());
+              SmallVector<int> ShuffleMask2(SV2->getShuffleMask());
               LocalVF = ShuffleMask2.size();
               if (auto *FTy = dyn_cast<FixedVectorType>(Op2->getType()))
                 LocalVF = FTy->getNumElements();
@@ -8062,7 +8059,7 @@ class BaseShuffleAnalysis {
     if (isa<PoisonValue>(V1))
       return Builder.createPoison(
           cast<VectorType>(V1->getType())->getElementType(), Mask.size());
-    SmallVector<int> NewMask(Mask.begin(), Mask.end());
+    SmallVector<int> NewMask(Mask);
     bool IsIdentity = peekThroughShuffles(V1, NewMask, /*SinglePermute=*/true);
     assert(V1 && "Expected non-null value after looking through shuffles.");
 
@@ -8290,7 +8287,7 @@ class BoUpSLP::ShuffleCostEstimator : public BaseShuffleAnalysis {
       return TTI::TCC_Free;
     auto *VecTy = getWidenedType(ScalarTy, VL.size());
     InstructionCost GatherCost = 0;
-    SmallVector<Value *> Gathers(VL.begin(), VL.end());
+    SmallVector<Value *> Gathers(VL);
     // Improve gather cost for gather of loads, if we can group some of the
     // loads into vector loads.
     InstructionsState S = getSameOpcode(VL, *R.TLI);
@@ -8725,7 +8722,7 @@ class BoUpSLP::ShuffleCostEstimator : public BaseShuffleAnalysis {
                 const PointerUnion<Value *, const TreeEntry *> &P2,
                 ArrayRef<int> Mask) {
     ShuffleCostBuilder Builder(TTI);
-    SmallVector<int> CommonMask(Mask.begin(), Mask.end());
+    SmallVector<int> CommonMask(Mask);
     Value *V1 = P1.dyn_cast<Value *>(), *V2 = P2.dyn_cast<Value *>();
     unsigned CommonVF = Mask.size();
     InstructionCost ExtraCost = 0;
diff --git a/llvm/lib/Transforms/Vectorize/VectorCombine.cpp b/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
index 444598520c981a..d81c747684f07a 100644
--- a/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
+++ b/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
@@ -1434,7 +1434,7 @@ bool VectorCombine::foldShuffleOfBinops(Instruction &I) {
       M -= NumSrcElts;
   };
 
-  SmallVector<int> NewMask0(OldMask.begin(), OldMask.end());
+  SmallVector<int> NewMask0(OldMask);
   TargetTransformInfo::ShuffleKind SK0 = TargetTransformInfo::SK_PermuteTwoSrc;
   if (X == Z) {
     llvm::for_each(NewMask0, ConvertToUnary);
@@ -1442,7 +1442,7 @@ bool VectorCombine::foldShuffleOfBinops(Instruction &I) {
     Z = PoisonValue::get(BinOpTy);
   }
 
-  SmallVector<int> NewMask1(OldMask.begin(), OldMask.end());
+  SmallVector<int> NewMask1(OldMask);
   TargetTransformInfo::ShuffleKind SK1 = TargetTransformInfo::SK_PermuteTwoSrc;
   if (Y == W) {
     llvm::for_each(NewMask1, ConvertToUnary);
@@ -1624,7 +1624,7 @@ bool VectorCombine::foldShuffleOfShuffles(Instruction &I) {
     return false;
 
   // Merge shuffles - replace index to the RHS poison arg with PoisonMaskElem,
-  SmallVector<int, 16> NewMask(OuterMask.begin(), OuterMask.end());
+  SmallVector<int, 16> NewMask(OuterMask);
   for (int &M : NewMask) {
     if (0 <= M && M < (int)NumImmElts) {
       M = (InnerMask0[M] >= (int)NumSrcElts) ? PoisonMaskElem : InnerMask0[M];