From 50084e515f15bc05498d68af7c294a77c3b86f8a Mon Sep 17 00:00:00 2001
From: EgorBo <egorbo@gmail.com>
Date: Sat, 24 Sep 2022 21:30:31 +0200
Subject: [PATCH] don't use write barriers for frozen objects

---
 src/coreclr/jit/gcinfo.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/coreclr/jit/gcinfo.cpp b/src/coreclr/jit/gcinfo.cpp
index 1d0229fbf26f5..ae7303435a68c 100644
--- a/src/coreclr/jit/gcinfo.cpp
+++ b/src/coreclr/jit/gcinfo.cpp
@@ -252,6 +252,12 @@ GCInfo::WriteBarrierForm GCInfo::gcIsWriteBarrierCandidate(GenTreeStoreInd* stor
         return WBF_NoBarrier;
     }
 
+    if (store->Data()->IsIconHandle(GTF_ICON_OBJ_HDL))
+    {
+        // Ignore frozen objects
+        return WBF_NoBarrier;
+    }
+
     WriteBarrierForm wbf = gcWriteBarrierFormFromTargetAddress(store->Addr());
 
     if (wbf == WBF_BarrierUnknown)