[llvm] Remove redundant string initialization (NFC)

Identified with readability-redundant-string-init.

5 files changed, 9 insertions, 9 deletions

diff --git a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
index 857d7f5..1ca4a68 100644
--- a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
+++ b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
@@ -873,7 +873,7 @@ bool TreePredicateFn::hasPredCode() const {
 }
 
 std::string TreePredicateFn::getPredCode() const {
-  std::string Code = "";
+  std::string Code;
 
   if (!isLoad() && !isStore() && !isAtomic()) {
     Record *MemoryVT = getMemoryVT();
diff --git a/llvm/utils/TableGen/CodeGenInstruction.cpp b/llvm/utils/TableGen/CodeGenInstruction.cpp
index 1df5902..960fe08 100644
--- a/llvm/utils/TableGen/CodeGenInstruction.cpp
+++ b/llvm/utils/TableGen/CodeGenInstruction.cpp
@@ -472,7 +472,7 @@ HasOneImplicitDefWithKnownVT(const CodeGenTarget &TargetInfo) const {
 /// include text from the specified variant, returning the new string.
 std::string CodeGenInstruction::
 FlattenAsmStringVariants(StringRef Cur, unsigned Variant) {
-  std::string Res = "";
+  std::string Res;
 
   for (;;) {
     // Find the start of the next variant string.
diff --git a/llvm/utils/TableGen/CodeGenMapTable.cpp b/llvm/utils/TableGen/CodeGenMapTable.cpp
index ea53a2d..289a20a 100644
--- a/llvm/utils/TableGen/CodeGenMapTable.cpp
+++ b/llvm/utils/TableGen/CodeGenMapTable.cpp
@@ -374,7 +374,7 @@ unsigned MapTableEmitter::emitBinSearchTable(raw_ostream &OS) {
   for (unsigned i = 0; i < TotalNumInstr; i++) {
     Record *CurInstr = NumberedInstructions[i]->TheDef;
     std::vector<Record*> ColInstrs = MapTable[CurInstr];
-    std::string OutStr("");
+    std::string OutStr;
     unsigned RelExists = 0;
     if (!ColInstrs.empty()) {
       for (unsigned j = 0; j < NumCol; j++) {
diff --git a/llvm/utils/TableGen/GlobalISelEmitter.cpp b/llvm/utils/TableGen/GlobalISelEmitter.cpp
index 4be5393..b238573 100644
--- a/llvm/utils/TableGen/GlobalISelEmitter.cpp
+++ b/llvm/utils/TableGen/GlobalISelEmitter.cpp
@@ -201,7 +201,7 @@ static Optional<LLTCodeGen> MVTToLLT(MVT::SimpleValueType SVT) {
 }
 
 static std::string explainPredicates(const TreePatternNode *N) {
-  std::string Explanation = "";
+  std::string Explanation;
   StringRef Separator = "";
   for (const TreePredicateCall &Call : N->getPredicateCalls()) {
     const TreePredicateFn &P = Call.Fn;
@@ -305,8 +305,8 @@ static Error failedImport(const Twine &Reason) {
 }
 
 static Error isTrivialOperatorNode(const TreePatternNode *N) {
-  std::string Explanation = "";
-  std::string Separator = "";
+  std::string Explanation;
+  std::string Separator;
 
   bool HasUnsupportedPredicate = false;
   for (const TreePredicateCall &Call : N->getPredicateCalls()) {
diff --git a/llvm/utils/TableGen/RISCVCompressInstEmitter.cpp b/llvm/utils/TableGen/RISCVCompressInstEmitter.cpp
index dcca207..70f5181 100644
--- a/llvm/utils/TableGen/RISCVCompressInstEmitter.cpp
+++ b/llvm/utils/TableGen/RISCVCompressInstEmitter.cpp
@@ -635,10 +635,10 @@ void RISCVCompressInstEmitter::emitCompressInstEmitter(raw_ostream &o,
     return;
   }
 
-  std::string CaseString("");
+  std::string CaseString;
   raw_string_ostream CaseStream(CaseString);
-  std::string PrevOp("");
-  std::string CurOp("");
+  std::string PrevOp;
+  std::string CurOp;
   CaseStream << "  switch (MI.getOpcode()) {\n";
   CaseStream << "    default: return false;\n";