From 0629b22bf09ae6b3c3689c5f98492df7577bf0d2 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Fri, 8 Mar 2024 18:08:24 -0800
Subject: Enhance link-time type test. (#3724)

* Enhance link-time type test.

* Fix.

* Fix.
---
 source/slang/slang-emit.cpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'source/slang/slang-emit.cpp')

diff --git a/source/slang/slang-emit.cpp b/source/slang/slang-emit.cpp
index 1d72fd233..5ec6fa62a 100644
--- a/source/slang/slang-emit.cpp
+++ b/source/slang/slang-emit.cpp
@@ -491,6 +491,11 @@ Result linkAndOptimizeIR(
 
     validateIRModuleIfEnabled(codeGenContext, irModule);
 
+    // If we have any witness tables that are marked as `KeepAlive`, 
+    // but are not used for dynamic dispatch, unpin them so we don't
+    // do unnecessary work to lower them.
+    unpinWitnessTables(irModule);
+
     simplifyIR(targetProgram, irModule, IRSimplificationOptions::getFast(), sink);
 
     if (!ArtifactDescUtil::isCpuLikeTarget(artifactDesc))
-- 
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