[clang] 1884ffc - [TableGen] Use heterogenous lookups with std::map (NFC) (#115994)

[via cfe-commits]

Author: Kazu Hirata
Date: 2024-11-13T06:41:33-08:00
New Revision: 1884ffc41c20b1e08b30eef4e8ebbcc54543a139

URL: https://github.com/llvm/llvm-project/commit/1884ffc41c20b1e08b30eef4e8ebbcc54543a139
DIFF: https://github.com/llvm/llvm-project/commit/1884ffc41c20b1e08b30eef4e8ebbcc54543a139.diff

LOG: [TableGen] Use heterogenous lookups with std::map (NFC) (#115994)

Heterogenous lookups allow us to call find with StringRef, avoiding a
temporary heap allocation of std::string.

Added: 
    

Modified: 
    clang/utils/TableGen/MveEmitter.cpp

Removed: 
    


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diff  --git a/clang/utils/TableGen/MveEmitter.cpp b/clang/utils/TableGen/MveEmitter.cpp
index 51e570944b49b6..5ae894d8e0718c 100644
--- a/clang/utils/TableGen/MveEmitter.cpp
+++ b/clang/utils/TableGen/MveEmitter.cpp
@@ -471,7 +471,7 @@ class Result {
 
 public:
   virtual ~Result() = default;
-  using Scope = std::map<std::string, Ptr>;
+  using Scope = std::map<std::string, Ptr, std::less<>>;
   virtual void genCode(raw_ostream &OS, CodeGenParamAllocator &) const = 0;
   virtual bool hasIntegerConstantValue() const { return false; }
   virtual uint32_t integerConstantValue() const { return 0; }
@@ -1278,7 +1278,7 @@ Result::Ptr EmitterBase::getCodeForDagArg(const DagInit *D, unsigned ArgNum,
     if (!isa<UnsetInit>(Arg))
       PrintFatalError(
           "dag operator argument should not have both a value and a name");
-    auto it = Scope.find(std::string(Name));
+    auto it = Scope.find(Name);
     if (it == Scope.end())
       PrintFatalError("unrecognized variable name '" + Name + "'");
     return it->second;