[llvm-commits] [PATCH 16/20] [AVX] Make VarInit Unique

[David Greene]

Make sure VarInits are unique and created only once.
---
 utils/TableGen/Record.cpp |   16 +++++++++++++++-
 1 files changed, 15 insertions(+), 1 deletions(-)

diff --git oldutils/TableGen/Record.cpp newutils/TableGen/Record.cpp
index 64ddced..6b37898 100644
--- oldutils/TableGen/Record.cpp
+++ newutils/TableGen/Record.cpp
@@ -1299,7 +1299,21 @@ TypedInit::convertInitListSlice(const std::vector<unsigned> &Elements) const {
 
 
 const VarInit *VarInit::get(const std::string &VN, RecTy *T) {
-  return new VarInit(VN, T);
+  typedef std::pair<RecTy *, std::string> Key;
+  typedef DenseMap<Key, VarInit *> Pool;
+  static Pool ThePool;
+
+  Key TheKey(std::make_pair(T, VN));
+  Pool::iterator Result = ThePool.find(TheKey);
+
+  if (Result == ThePool.end()) {
+    VarInit *New = new VarInit(VN, T);
+    bool Inserted = false;
+    tie(Result, Inserted) = ThePool.insert(std::make_pair(TheKey, New));
+    assert(Inserted && "Did not insert new Init into pool!");
+  }
+    
+  return Result->second;
 }
 
 const Init *VarInit::resolveBitReference(Record &R, const RecordVal *IRV,
-- 
1.7.6