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src/hotspot/share/opto/macro.cpp

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@@ -1699,11 +1699,13 @@
    if (!mark_node->is_Con()) {
      transform_later(mark_node);
    }
    rawmem = make_store(control, rawmem, object, oopDesc::mark_offset_in_bytes(), mark_node, TypeX_X->basic_type());
  
-   rawmem = make_store(control, rawmem, object, oopDesc::klass_offset_in_bytes(), klass_node, T_METADATA);
+   if (!UseCompactObjectHeaders) {
+     rawmem = make_store(control, rawmem, object, oopDesc::klass_offset_in_bytes(), klass_node, T_METADATA);
+   }
    int header_size = alloc->minimum_header_size();  // conservatively small
  
    // Array length
    if (length != nullptr) {         // Arrays need length field
      rawmem = make_store(control, rawmem, object, arrayOopDesc::length_offset_in_bytes(), length, T_INT);
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