[TableGen] Use empty emplace_back to add defaulted constructed objects to vectors to avoid using resize(size()+1). NFC

llvm-svn: 328184

1 files changed, 8 insertions, 10 deletions

diff --git a/llvm/utils/TableGen/CodeGenSchedule.cpp b/llvm/utils/TableGen/CodeGenSchedule.cpp
index 1f812fd90e9..1b516c17530 100644
--- a/llvm/utils/TableGen/CodeGenSchedule.cpp
+++ b/llvm/utils/TableGen/CodeGenSchedule.cpp
@@ -1312,7 +1312,7 @@ void PredTransitions::substituteVariants(const PredTransition &Trans) {
   // Build up a set of partial results starting at the back of
   // PredTransitions. Remember the first new transition.
   unsigned StartIdx = TransVec.size();
-  TransVec.resize(TransVec.size() + 1);
+  TransVec.emplace_back();
   TransVec.back().PredTerm = Trans.PredTerm;
   TransVec.back().ProcIndices = Trans.ProcIndices;
 
@@ -1323,7 +1323,7 @@ void PredTransitions::substituteVariants(const PredTransition &Trans) {
     // Push a new (empty) write sequence onto all partial Transitions.
     for (std::vector<PredTransition>::iterator I =
            TransVec.begin() + StartIdx, E = TransVec.end(); I != E; ++I) {
-      I->WriteSequences.resize(I->WriteSequences.size() + 1);
+      I->WriteSequences.emplace_back();
     }
     substituteVariantOperand(*WSI, /*IsRead=*/false, StartIdx);
   }
@@ -1334,7 +1334,7 @@ void PredTransitions::substituteVariants(const PredTransition &Trans) {
     // Push a new (empty) read sequence onto all partial Transitions.
     for (std::vector<PredTransition>::iterator I =
            TransVec.begin() + StartIdx, E = TransVec.end(); I != E; ++I) {
-      I->ReadSequences.resize(I->ReadSequences.size() + 1);
+      I->ReadSequences.emplace_back();
     }
     substituteVariantOperand(*RSI, /*IsRead=*/true, StartIdx);
   }
@@ -1388,16 +1388,15 @@ void CodeGenSchedModels::inferFromRW(ArrayRef<unsigned> OperWrites,
   // Create a seed transition with an empty PredTerm and the expanded sequences
   // of SchedWrites for the current SchedClass.
   std::vector<PredTransition> LastTransitions;
-  LastTransitions.resize(1);
+  LastTransitions.emplace_back();
   LastTransitions.back().ProcIndices.append(ProcIndices.begin(),
                                             ProcIndices.end());
 
   for (unsigned WriteIdx : OperWrites) {
     IdxVec WriteSeq;
     expandRWSequence(WriteIdx, WriteSeq, /*IsRead=*/false);
-    unsigned Idx = LastTransitions[0].WriteSequences.size();
-    LastTransitions[0].WriteSequences.resize(Idx + 1);
-    SmallVectorImpl<unsigned> &Seq = LastTransitions[0].WriteSequences[Idx];
+    LastTransitions[0].WriteSequences.emplace_back();
+    SmallVectorImpl<unsigned> &Seq = LastTransitions[0].WriteSequences.back();
     Seq.append(WriteSeq.begin(), WriteSeq.end());
     DEBUG(dbgs() << "("; dumpIdxVec(Seq); dbgs() << ") ");
   }
@@ -1405,9 +1404,8 @@ void CodeGenSchedModels::inferFromRW(ArrayRef<unsigned> OperWrites,
   for (unsigned ReadIdx : OperReads) {
     IdxVec ReadSeq;
     expandRWSequence(ReadIdx, ReadSeq, /*IsRead=*/true);
-    unsigned Idx = LastTransitions[0].ReadSequences.size();
-    LastTransitions[0].ReadSequences.resize(Idx + 1);
-    SmallVectorImpl<unsigned> &Seq = LastTransitions[0].ReadSequences[Idx];
+    LastTransitions[0].ReadSequences.emplace_back();
+    SmallVectorImpl<unsigned> &Seq = LastTransitions[0].ReadSequences.back();
     Seq.append(ReadSeq.begin(), ReadSeq.end());
     DEBUG(dbgs() << "("; dumpIdxVec(Seq); dbgs() << ") ");
   }