[AVX] Make VarBitInit Unique

Make sure VarBitInits are unique and created only once.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136498 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/utils/TableGen/Record.cpp b/utils/TableGen/Record.cpp
index 68f9f2a2471412fe1ad3106285b371b73af11e3c..3a022fc151e4965079f05f42d05967a7fff54ea9 100644 (file)
--- a/utils/TableGen/Record.cpp
+++ b/utils/TableGen/Record.cpp
@@ -1389,7 +1389,16 @@ const Init *VarInit::resolveReferences(Record &R, const RecordVal *RV) const {
 }
 
 const VarBitInit *VarBitInit::get(const TypedInit *T, unsigned B) {
-  return new VarBitInit(T, B);
+  typedef std::pair<const TypedInit *, unsigned> Key;
+  typedef DenseMap<Key, VarBitInit *> Pool;
+
+  static Pool ThePool;
+
+  Key TheKey(std::make_pair(T, B));
+
+  VarBitInit *&I = ThePool[TheKey];
+  if (!I) I = new VarBitInit(T, B);
+  return I;
 }
 
 std::string VarBitInit::getAsString() const {