From 9aa82842c7ad48d05b9305d3478f3b318a7e7f81 Mon Sep 17 00:00:00 2001
From: David Greene <greened@obbligato.org>
Date: Fri, 29 Jul 2011 19:07:22 +0000
Subject: [PATCH] [AVX] Make VarBitInit Unique

Make sure VarBitInits are unique and created only once.

llvm-svn: 136498
---
 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 68f9f2a24714..3a022fc151e4 100644
--- a/llvm/utils/TableGen/Record.cpp
+++ b/llvm/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 {