Fix spelling mistakes in SelectionDAG comments. NFC.

Identified by Pedro Giffuni in PR27636.

llvm-svn: 287487

llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

@@ -5281,7 +5281,7 @@ SDValue DAGCombiner::visitSELECT(SDNode *N) {
     // The code in this block deals with the following 2 equivalences:
     //    select(C0|C1, x, y) <=> select(C0, x, select(C1, x, y))
     //    select(C0&C1, x, y) <=> select(C0, select(C1, x, y), y)
-    // The target can specify its prefered form with the
+    // The target can specify its preferred form with the
     // shouldNormalizeToSelectSequence() callback. However we always transform
     // to the right anyway if we find the inner select exists in the DAG anyway
     // and we always transform to the left side if we know that we can further
@@ -10569,7 +10569,7 @@ struct LoadedSlice {
     assert(Inst && Origin && "Unable to replace a non-existing slice.");
     const SDValue &OldBaseAddr = Origin->getBasePtr();
     SDValue BaseAddr = OldBaseAddr;
-    // Get the offset in that chunk of bytes w.r.t. the endianess.
+    // Get the offset in that chunk of bytes w.r.t. the endianness.
     int64_t Offset = static_cast<int64_t>(getOffsetFromBase());
     assert(Offset >= 0 && "Offset too big to fit in int64_t!");
     if (Offset) {

llvm/lib/CodeGen/SelectionDAG/FastISel.cpp

@@ -570,7 +570,7 @@ bool FastISel::addStackMapLiveVars(SmallVectorImpl<MachineOperand> &Ops,
       Ops.push_back(MachineOperand::CreateImm(StackMaps::ConstantOp));
       Ops.push_back(MachineOperand::CreateImm(0));
     } else if (auto *AI = dyn_cast<AllocaInst>(Val)) {
-      // Values coming from a stack location also require a sepcial encoding,
+      // Values coming from a stack location also require a special encoding,
       // but that is added later on by the target specific frame index
       // elimination implementation.
       auto SI = FuncInfo.StaticAllocaMap.find(AI);

llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp

@@ -4443,7 +4443,7 @@ void SelectionDAGLegalize::PromoteNode(SDNode *Node) {
     MVT EltVT = OVT.getVectorElementType();
     MVT NewEltVT = NVT.getVectorElementType();
 
-    // Handle bitcasts to different vector type with the smae total bit size.
+    // Handle bitcasts to different vector type with the same total bit size.
     //
     // e.g. v2i64 = scalar_to_vector x:i64
     //   =>

llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp

@@ -918,7 +918,7 @@ void SelectionDAGBuilder::visitGCResult(const GCResultInst &CI) {
 void SelectionDAGBuilder::visitGCRelocate(const GCRelocateInst &Relocate) {
 #ifndef NDEBUG
   // Consistency check
-  // We skip this check for relocates not in the same basic block as thier
+  // We skip this check for relocates not in the same basic block as their
   // statepoint. It would be too expensive to preserve validation info through
   // different basic blocks.
   if (Relocate.getStatepoint()->getParent() == Relocate.getParent())