Reserve fast dictionary slots for Tier1 code (dotnet/coreclr#22619)

Disable use of fast dictionary slots for R2R images when tiered JITing is enabled. Fixes dotnet/coreclr#22400 Commit migrated from dotnet/coreclr@bae641f
picenka21 · Feb 15, 2019 · d52be3f · d52be3f
1 parent ef302b0
commit d52be3f
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/src/coreclr/src/vm/genericdict.cpp b/src/coreclr/src/vm/genericdict.cpp
@@ -132,6 +132,15 @@ DictionaryLayout::FindTokenWorker(LoaderAllocator *                 pAllocator,
     }
     CONTRACTL_END
 
+#ifndef FEATURE_NATIVE_IMAGE_GENERATION
+    // If the tiered compilation is on, save the fast dictionary slots for the hot Tier1 code
+    if (g_pConfig->TieredCompilation() && signatureSource == FromReadyToRunImage)
+    {
+        pResult->signature = pSig;
+        return FALSE;
+    }
+#endif
+
     BOOL isFirstBucket = TRUE;
 
     // First bucket also contains type parameters