[llvm-commits] [PATCH 13/20] [AVX] Make UnOpInit Unique

[David Greene]

Make sure UnOpInits are unique and created only once.  This will be
important for AVX/SIMD as many operators will be used to generate
patterns and other relevant data.
---
 utils/TableGen/Record.cpp |   17 ++++++++++++++++-
 1 files changed, 16 insertions(+), 1 deletions(-)

diff --git oldutils/TableGen/Record.cpp newutils/TableGen/Record.cpp
index 5d1ec3a..7adee3b 100644
--- oldutils/TableGen/Record.cpp
+++ newutils/TableGen/Record.cpp
@@ -697,7 +697,22 @@ const Init *OpInit::resolveListElementReference(Record &R, const RecordVal *IRV,
 }
 
 const UnOpInit *UnOpInit::get(UnaryOp opc, const Init *lhs, RecTy *Type) {
-  return new UnOpInit(opc, lhs, Type);
+  typedef std::pair<std::pair<unsigned, const Init *>, RecTy *> Key;
+
+  typedef DenseMap<Key, UnOpInit *> Pool;
+  static Pool ThePool;  
+
+  Key TheKey(std::make_pair(std::make_pair(opc, lhs), Type));
+  Pool::iterator Result = ThePool.find(TheKey);
+
+  if (Result == ThePool.end()) {
+    UnOpInit *New = new UnOpInit(opc, lhs, Type);
+    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 *UnOpInit::Fold(Record *CurRec, MultiClass *CurMultiClass) const {
-- 
1.7.6