--- old/src/hotspot/share/runtime/arguments.cpp	2018-11-19 17:22:35.208170400 -0800
+++ new/src/hotspot/share/runtime/arguments.cpp	2018-11-19 17:22:34.274073200 -0800
@@ -1622,6 +1622,10 @@
 }
 
 void Arguments::set_use_compressed_oops() {
+if (AllocateOldGenAt != NULL) {
+  FLAG_SET_ERGO(bool, UseCompressedOops, false);
+  return;
+}
 #ifndef ZERO
 #ifdef _LP64
   // MaxHeapSize is not set up properly at this point, but
@@ -2063,17 +2067,7 @@
     }
   }
 
-  if(!FLAG_IS_DEFAULT(AllocateHeapAt) && !FLAG_IS_DEFAULT(AllocateOldGenAt)) {
-    jio_fprintf(defaultStream::error_stream(),
-                "AllocateHeapAt and AllocateOldGenAt cannot be used together.\n");
-    status = false;
-  }
-
-  if (!FLAG_IS_DEFAULT(AllocateOldGenAt) && (UseSerialGC || UseConcMarkSweepGC || UseEpsilonGC || UseZGC)) {
-    jio_fprintf(defaultStream::error_stream(),
-      "AllocateOldGenAt not supported for selected GC.\n");
-    status = false;
-  }
+  status = status && GCArguments::check_args_consistency();
 
   return status;
 }