src/hotspot/share/opto/c2compiler.cpp

@@ -545,10 +545,16 @@
   case vmIntrinsics::_getClassId:
   case vmIntrinsics::_getEventWriter:
 #endif
   case vmIntrinsics::_currentTimeMillis:
   case vmIntrinsics::_nanoTime:
+    break;
+  case vmIntrinsics::_writeback0:
+  case vmIntrinsics::_writebackPreSync0:
+  case vmIntrinsics::_writebackPostSync0:
+    if (getenv("DISABLE_UNSAFE_WRITEBACK_INTRINSIC")) return false;
+    break;
   case vmIntrinsics::_allocateInstance:
   case vmIntrinsics::_allocateUninitializedArray:
   case vmIntrinsics::_newArray:
   case vmIntrinsics::_getLength:
   case vmIntrinsics::_copyOf: