diff --git a/llvm/lib/CodeGen/InterleavedLoadCombinePass.cpp b/llvm/lib/CodeGen/InterleavedLoadCombinePass.cpp
index 230c6846dde2cf..5cd20e53c64a2d 100644
--- a/llvm/lib/CodeGen/InterleavedLoadCombinePass.cpp
+++ b/llvm/lib/CodeGen/InterleavedLoadCombinePass.cpp
@@ -1206,9 +1206,7 @@ bool InterleavedLoadCombineImpl::combine(std::list<VectorInfo> &InterleavedLoad,
           ->getNumElements();
   FixedVectorType *ILTy = FixedVectorType::get(ETy, Factor * ElementsPerSVI);
 
-  SmallVector<unsigned, 4> Indices;
-  for (unsigned i = 0; i < Factor; i++)
-    Indices.push_back(i);
+  auto Indices = llvm::to_vector<4>(llvm::seq<unsigned>(0, Factor));
   InterleavedCost = TTI.getInterleavedMemoryOpCost(
       Instruction::Load, ILTy, Factor, Indices, InsertionPoint->getAlign(),
       InsertionPoint->getPointerAddressSpace(), CostKind);
diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
index abf6a3ac691641..5a6804eaf2b34d 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
@@ -1050,10 +1050,7 @@ SDValue VectorLegalizer::ExpandZERO_EXTEND_VECTOR_INREG(SDNode *Node) {
 
   // Shuffle the incoming lanes into the correct position, and pull all other
   // lanes from the zero vector.
-  SmallVector<int, 16> ShuffleMask;
-  ShuffleMask.reserve(NumSrcElements);
-  for (int i = 0; i < NumSrcElements; ++i)
-    ShuffleMask.push_back(i);
+  auto ShuffleMask = llvm::to_vector<16>(llvm::seq<int>(0, NumSrcElements));
 
   int ExtLaneScale = NumSrcElements / NumElements;
   int EndianOffset = DAG.getDataLayout().isBigEndian() ? ExtLaneScale - 1 : 0;
diff --git a/llvm/lib/CodeGen/SplitKit.cpp b/llvm/lib/CodeGen/SplitKit.cpp
index 3851a0cdb8e613..f270c3a648b3e8 100644
--- a/llvm/lib/CodeGen/SplitKit.cpp
+++ b/llvm/lib/CodeGen/SplitKit.cpp
@@ -1525,9 +1525,8 @@ void SplitEditor::finish(SmallVectorImpl<unsigned> *LRMap) {
 
   // Provide a reverse mapping from original indices to Edit ranges.
   if (LRMap) {
-    LRMap->clear();
-    for (unsigned i = 0, e = Edit->size(); i != e; ++i)
-      LRMap->push_back(i);
+    auto Seq = llvm::seq<unsigned>(0, Edit->size());
+    LRMap->assign(Seq.begin(), Seq.end());
   }
 
   // Now check if any registers were separated into multiple components.
diff --git a/llvm/lib/Transforms/Scalar/SROA.cpp b/llvm/lib/Transforms/Scalar/SROA.cpp
index 8be8946702be8e..ebff174f538eff 100644
--- a/llvm/lib/Transforms/Scalar/SROA.cpp
+++ b/llvm/lib/Transforms/Scalar/SROA.cpp
@@ -2179,10 +2179,7 @@ static Value *extractVector(IRBuilderTy &IRB, Value *V, unsigned BeginIndex,
     return V;
   }
 
-  SmallVector<int, 8> Mask;
-  Mask.reserve(NumElements);
-  for (unsigned i = BeginIndex; i != EndIndex; ++i)
-    Mask.push_back(i);
+  auto Mask = llvm::to_vector<8>(llvm::seq<int>(BeginIndex, EndIndex));
   V = IRB.CreateShuffleVector(V, Mask, Name + ".extract");
   LLVM_DEBUG(dbgs() << "     shuffle: " << *V << "\n");
   return V;