test/hotspot/jtreg/compiler/valhalla/valuetypes/ValueTypeTest.java

*** 749,754 ****
--- 749,767 ----
          if (VERBOSE) {
              System.out.println("enqueueMethodForCompilation " + m + ", level = " + level);
          }
          WHITE_BOX.enqueueMethodForCompilation(m, level);
      }
+ 
+     // Unlike C2, C1 intrinsics never deoptimize System.arraycopy. Instead, we fall back to
+     // a normal method invocation when encountering flattened arrays.
+     static boolean isCompiledByC2(Method m) {
+         int CompLevel_none              = 0,         // Interpreter
+             CompLevel_simple            = 1,         // C1
+             CompLevel_limited_profile   = 2,         // C1, invocation & backedge counters
+             CompLevel_full_profile      = 3,         // C1, invocation & backedge counters + mdo
+             CompLevel_full_optimization = 4;         // C2 or JVMCI
+ 
+         return USE_COMPILER && !XCOMP && WHITE_BOX.isMethodCompiled(m, false) &&
+             WHITE_BOX.getMethodCompilationLevel(m, false) >= CompLevel_full_optimization;
+     }
  }