[LV] Remove more references of unrolled parts after 57f5d8f2fe.

Continue to clean up some now stale references of unroll parts and
related terminology as pointed out post-commit for 06c3a7d.

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -538,12 +538,6 @@ protected:
   /// A small list of PHINodes.
   using PhiVector = SmallVector<PHINode *, 4>;
 
-  /// A type for scalarized values in the new loop. Each value from the
-  /// original loop, when scalarized, is represented by UF x VF scalar values
-  /// in the new unrolled loop, where UF is the unroll factor and VF is the
-  /// vectorization factor.
-  using ScalarParts = SmallVector<SmallVector<Value *, 4>, 2>;
-
   /// Set up the values of the IVs correctly when exiting the vector loop.
   void fixupIVUsers(PHINode *OrigPhi, const InductionDescriptor &II,
                     Value *VectorTripCount, Value *EndValue,

llvm/lib/Transforms/Vectorize/VPlan.cpp

@@ -333,10 +333,10 @@ Value *VPTransformState::get(VPValue *Def, bool NeedsScalar) {
 
   // However, if we are vectorizing, we need to construct the vector values.
   // If the value is known to be uniform after vectorization, we can just
-  // broadcast the scalar value corresponding to lane zero for each unroll
-  // iteration. Otherwise, we construct the vector values using
-  // insertelement instructions. Since the resulting vectors are stored in
-  // State, we will only generate the insertelements once.
+  // broadcast the scalar value corresponding to lane zero. Otherwise, we
+  // construct the vector values using insertelement instructions. Since the
+  // resulting vectors are stored in State, we will only generate the
+  // insertelements once.
   Value *VectorValue = nullptr;
   if (IsUniform) {
     VectorValue = GetBroadcastInstrs(ScalarValue);
@@ -769,15 +769,15 @@ void VPRegionBlock::execute(VPTransformState *State) {
 
   // Enter replicating mode.
   State->Instance = VPIteration(0, 0);
-    assert(!State->VF.isScalable() && "VF is assumed to be non scalable.");
-    for (unsigned Lane = 0, VF = State->VF.getKnownMinValue(); Lane < VF;
-         ++Lane) {
-      State->Instance->Lane = VPLane(Lane, VPLane::Kind::First);
-      // Visit the VPBlocks connected to \p this, starting from it.
-      for (VPBlockBase *Block : RPOT) {
-        LLVM_DEBUG(dbgs() << "LV: VPBlock in RPO " << Block->getName() << '\n');
-        Block->execute(State);
-      }
+  assert(!State->VF.isScalable() && "VF is assumed to be non scalable.");
+  for (unsigned Lane = 0, VF = State->VF.getKnownMinValue(); Lane < VF;
+       ++Lane) {
+    State->Instance->Lane = VPLane(Lane, VPLane::Kind::First);
+    // Visit the VPBlocks connected to \p this, starting from it.
+    for (VPBlockBase *Block : RPOT) {
+      LLVM_DEBUG(dbgs() << "LV: VPBlock in RPO " << Block->getName() << '\n');
+      Block->execute(State);
+    }
   }
 
   // Exit replicating mode.

llvm/lib/Transforms/Vectorize/VPlan.h

@@ -254,7 +254,7 @@ struct VPTransformState {
                    DominatorTree *DT, IRBuilderBase &Builder,
                    InnerLoopVectorizer *ILV, VPlan *Plan);
 
-  /// The chosen Vectorization and Unroll Factors of the loop being vectorized.
+  /// The chosen Vectorization Factor of the loop being vectorized.
   ElementCount VF;
 
   /// Hold the indices to generate specific scalar instructions. Null indicates
@@ -1253,9 +1253,7 @@ public:
     ComputeReductionResult,
     // Takes the VPValue to extract from as first operand and the lane or part
     // to extract as second operand, counting from the end starting with 1 for
-    // last. The second operand must be a positive constant and <= VF when
-    // extracting from a vector or <= UF when extracting from an unrolled
-    // scalar.
+    // last. The second operand must be a positive constant and <= VF.
     ExtractFromEnd,
     LogicalAnd, // Non-poison propagating logical And.
     // Add an offset in bytes (second operand) to a base pointer (first

llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp

@@ -2490,9 +2490,7 @@ void VPInterleaveRecipe::execute(VPTransformState &State) {
   // If the group is reverse, adjust the index to refer to the last vector lane
   // instead of the first. We adjust the index from the first vector lane,
   // rather than directly getting the pointer for lane VF - 1, because the
-  // pointer operand of the interleaved access is supposed to be uniform. For
-  // uniform instructions, we're only required to generate a value for the
-  // first vector lane in each unroll iteration.
+  // pointer operand of the interleaved access is supposed to be uniform.
   if (Group->isReverse()) {
     Value *RuntimeVF =
         getRuntimeVF(State.Builder, State.Builder.getInt32Ty(), State.VF);