From 65bf3ca9aa474db6c5c2a0d3ea0f4a22af514184 Mon Sep 17 00:00:00 2001
From: David Greene <greened@obbligato.org>
Date: Fri, 29 Jul 2011 19:07:24 +0000
Subject: [PATCH] [AVX] Make FieldInit Unique

Make sure FieldInits are unique and created only once.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136500 91177308-0d34-0410-b5e6-96231b3b80d8
---
 utils/TableGen/Record.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/utils/TableGen/Record.cpp b/utils/TableGen/Record.cpp
index 89de3edfd19..d4e60839753 100644
--- a/utils/TableGen/Record.cpp
+++ b/utils/TableGen/Record.cpp
@@ -1475,7 +1475,15 @@ std::string DefInit::getAsString() const {
 }
 
 const FieldInit *FieldInit::get(const Init *R, const std::string &FN) {
-  return new FieldInit(R, FN);
+  typedef std::pair<const Init *, TableGenStringKey> Key;
+  typedef DenseMap<Key, FieldInit *> Pool;
+  static Pool ThePool;  
+
+  Key TheKey(std::make_pair(R, FN));
+
+  FieldInit *&I = ThePool[TheKey];
+  if (!I) I = new FieldInit(R, FN);
+  return I;
 }
 
 const Init *FieldInit::resolveBitReference(Record &R, const RecordVal *RV,