[PATCH] Switch a std::map to a DenseMap in CodeGenRegisters

[Owen Anderson]

Hi chandlerc, joker.eph,

As far as I can tell, the keys of the map are unique by pointer address, so there's no need to use the llvm::less comparator.  This allows us to use DenseMap instead, which reduces tblgen time by 20% on my stress test.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7544

Files:
  utils/TableGen/CodeGenRegisters.h

Index: utils/TableGen/CodeGenRegisters.h
===================================================================
--- utils/TableGen/CodeGenRegisters.h
+++ utils/TableGen/CodeGenRegisters.h
@@ -74,8 +74,7 @@
     std::string getQualifiedName() const;
 
     // Map of composite subreg indices.
-    typedef std::map<CodeGenSubRegIndex *, CodeGenSubRegIndex *,
-                     deref<llvm::less>> CompMap;
+    typedef DenseMap<CodeGenSubRegIndex *, CodeGenSubRegIndex *> CompMap;
 
     // Returns the subreg index that results from composing this with Idx.
     // Returns NULL if this and Idx don't compose.

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