From 4cb3eeb832b5fb29a61f2934b3daa5e42a3d6cde Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Tue, 18 Jul 2023 08:08:11 -0700
Subject: Simplify Lookup and improve compiler performance. (#2996)

* Simplify lookup.

* Various bug fixes.

* Report type dictionary size in perf benchmark.

* Remove type duplication.

* increase initial dict size.

* Bug fix.

* Fix bugs.

* Fixup.

* Revert type legalization looping.

* Fix specialization pass.

---------

Co-authored-by: Yong He <yhe@nvidia.com>
---
 source/slang/slang-ast-type.cpp | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

(limited to 'source/slang/slang-ast-type.cpp')

diff --git a/source/slang/slang-ast-type.cpp b/source/slang/slang-ast-type.cpp
index 9b6b439ce..ee5d1d40e 100644
--- a/source/slang/slang-ast-type.cpp
+++ b/source/slang/slang-ast-type.cpp
@@ -772,10 +772,8 @@ DeclRef<InterfaceDecl> ExtractExistentialType::getSpecializedInterfaceDeclRef()
 
     SubtypeWitness* openedWitness = getSubtypeWitness();
 
-    ThisTypeSubstitution* openedThisType = m_astBuilder->create<ThisTypeSubstitution>();
-    openedThisType->outer = originalInterfaceDeclRef.getSubst();
-    openedThisType->interfaceDecl = interfaceDecl;
-    openedThisType->witness = openedWitness;
+    ThisTypeSubstitution* openedThisType = m_astBuilder->getOrCreateThisTypeSubstitution(
+        interfaceDecl, openedWitness, originalInterfaceDeclRef.getSubst());
 
     DeclRef<InterfaceDecl> specialiedInterfaceDeclRef = m_astBuilder->getSpecializedDeclRef<InterfaceDecl>(interfaceDecl, openedThisType);
 
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