[TableGen] Avoid unnecessary std::string creations

Avoid unnecessary std::string creations in the TreePredicateFn getters and in CodeGenDAGPatterns::getSDNodeNamed

Differential Revision: https://reviews.llvm.org/D38624

llvm-svn: 315148

1 files changed, 8 insertions, 8 deletions

diff --git a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
index 1b5c1ae..946d8a2 100644
--- a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
+++ b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
@@ -854,11 +854,11 @@ TreePredicateFn::TreePredicateFn(TreePattern *N) : PatFragRec(N) {
         ".td file corrupt: can't have a node predicate *and* an imm predicate");
 }
 
-std::string TreePredicateFn::getPredCode() const {
+StringRef TreePredicateFn::getPredCode() const {
   return PatFragRec->getRecord()->getValueAsString("PredicateCode");
 }
 
-std::string TreePredicateFn::getImmCode() const {
+StringRef TreePredicateFn::getImmCode() const {
   return PatFragRec->getRecord()->getValueAsString("ImmediateCode");
 }
 
@@ -880,16 +880,16 @@ std::string TreePredicateFn::getFnName() const {
 /// appropriate.
 std::string TreePredicateFn::getCodeToRunOnSDNode() const {
   // Handle immediate predicates first.
-  std::string ImmCode = getImmCode();
+  StringRef ImmCode = getImmCode();
   if (!ImmCode.empty()) {
     std::string Result =
       "    int64_t Imm = cast<ConstantSDNode>(Node)->getSExtValue();\n";
-    return Result + ImmCode;
+    return Result + ImmCode.str();
   }
 
   // Handle arbitrary node predicates.
   assert(!getPredCode().empty() && "Don't have any predicate code!");
-  std::string ClassName;
+  StringRef ClassName;
   if (PatFragRec->getOnlyTree()->isLeaf())
     ClassName = "SDNode";
   else {
@@ -900,9 +900,9 @@ std::string TreePredicateFn::getCodeToRunOnSDNode() const {
   if (ClassName == "SDNode")
     Result = "    SDNode *N = Node;\n";
   else
-    Result = "    auto *N = cast<" + ClassName + ">(Node);\n";
+    Result = "    auto *N = cast<" + ClassName.str() + ">(Node);\n";
 
-  return Result + getPredCode();
+  return Result + getPredCode().str();
 }
 
 //===----------------------------------------------------------------------===//
@@ -2564,7 +2564,7 @@ CodeGenDAGPatterns::CodeGenDAGPatterns(RecordKeeper &R) :
   VerifyInstructionFlags();
 }
 
-Record *CodeGenDAGPatterns::getSDNodeNamed(const std::string &Name) const {
+Record *CodeGenDAGPatterns::getSDNodeNamed(StringRef Name) const {
   Record *N = Records.getDef(Name);
   if (!N || !N->isSubClassOf("SDNode"))
     PrintFatalError("Error getting SDNode '" + Name + "'!");