[NFC][IR2Vec] Initialize Embedding vectors with zeros by default (llvm#155690)

Initialize `Embedding` vectors with zeros by default when only size is provided.

Author: svkeerthy

llvm/include/llvm/Analysis/IR2Vec.h

@@ -92,7 +92,7 @@ struct Embedding {
   Embedding(std::vector<double> &&V) : Data(std::move(V)) {}
   Embedding(std::initializer_list<double> IL) : Data(IL) {}
 
-  explicit Embedding(size_t Size) : Data(Size) {}
+  explicit Embedding(size_t Size) : Data(Size, 0.0) {}
   Embedding(size_t Size, double InitialValue) : Data(Size, InitialValue) {}
 
   size_t size() const { return Data.size(); }

llvm/lib/Analysis/IR2Vec.cpp

@@ -155,7 +155,7 @@ void Embedding::print(raw_ostream &OS) const {
 Embedder::Embedder(const Function &F, const Vocabulary &Vocab)
     : F(F), Vocab(Vocab), Dimension(Vocab.getDimension()),
       OpcWeight(::OpcWeight), TypeWeight(::TypeWeight), ArgWeight(::ArgWeight),
-      FuncVector(Embedding(Dimension, 0)) {}
+      FuncVector(Embedding(Dimension)) {}
 
 std::unique_ptr<Embedder> Embedder::create(IR2VecKind Mode, const Function &F,
                                            const Vocabulary &Vocab) {
@@ -472,7 +472,7 @@ void IR2VecVocabAnalysis::generateNumMappedVocab() {
 
   // Handle Opcodes
   std::vector<Embedding> NumericOpcodeEmbeddings(Vocabulary::MaxOpcodes,
-                                                 Embedding(Dim, 0));
+                                                 Embedding(Dim));
   NumericOpcodeEmbeddings.reserve(Vocabulary::MaxOpcodes);
   for (unsigned Opcode : seq(0u, Vocabulary::MaxOpcodes)) {
     StringRef VocabKey = Vocabulary::getVocabKeyForOpcode(Opcode + 1);
@@ -487,7 +487,7 @@ void IR2VecVocabAnalysis::generateNumMappedVocab() {
 
   // Handle Types - only canonical types are present in vocabulary
   std::vector<Embedding> NumericTypeEmbeddings(Vocabulary::MaxCanonicalTypeIDs,
-                                               Embedding(Dim, 0));
+                                               Embedding(Dim));
   NumericTypeEmbeddings.reserve(Vocabulary::MaxCanonicalTypeIDs);
   for (unsigned CTypeID : seq(0u, Vocabulary::MaxCanonicalTypeIDs)) {
     StringRef VocabKey = Vocabulary::getVocabKeyForCanonicalTypeID(
@@ -503,7 +503,7 @@ void IR2VecVocabAnalysis::generateNumMappedVocab() {
 
   // Handle Arguments/Operands
   std::vector<Embedding> NumericArgEmbeddings(Vocabulary::MaxOperandKinds,
-                                              Embedding(Dim, 0));
+                                              Embedding(Dim));
   NumericArgEmbeddings.reserve(Vocabulary::MaxOperandKinds);
   for (unsigned OpKind : seq(0u, Vocabulary::MaxOperandKinds)) {
     Vocabulary::OperandKind Kind = static_cast<Vocabulary::OperandKind>(OpKind);