From 7f501e8b4d7c0637f30132ce6d5e52d10f6f4700 Mon Sep 17 00:00:00 2001
From: David Greene <greened@obbligato.org>
Date: Fri, 29 Jul 2011 19:07:23 +0000
Subject: [PATCH] [AVX] Make VarListElementInit Unique

Make sure VarListElementInits are unique and created only once.

llvm-svn: 136499
---
 llvm/utils/TableGen/Record.cpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/llvm/utils/TableGen/Record.cpp b/llvm/utils/TableGen/Record.cpp
index 3a022fc151e4..89de3edfd192 100644
--- a/llvm/utils/TableGen/Record.cpp
+++ b/llvm/utils/TableGen/Record.cpp
@@ -1414,7 +1414,16 @@ const Init *VarBitInit::resolveReferences(Record &R,
 
 const VarListElementInit *VarListElementInit::get(const TypedInit *T,
                                                   unsigned E) {
-  return new VarListElementInit(T, E);
+  typedef std::pair<const TypedInit *, unsigned> Key;
+  typedef DenseMap<Key, VarListElementInit *> Pool;
+
+  static Pool ThePool;
+
+  Key TheKey(std::make_pair(T, E));
+
+  VarListElementInit *&I = ThePool[TheKey];
+  if (!I) I = new VarListElementInit(T, E);
+  return I;
 }
 
 std::string VarListElementInit::getAsString() const {