diff a/src/hotspot/cpu/s390/s390.ad b/src/hotspot/cpu/s390/s390.ad
--- a/src/hotspot/cpu/s390/s390.ad
+++ b/src/hotspot/cpu/s390/s390.ad
@@ -1157,16 +1157,10 @@
     bs->nmethod_entry_barrier(masm);
   }
 
   C->output()->set_frame_complete(__ offset());
 }
-
-uint MachPrologNode::size(PhaseRegAlloc *ra_) const {
-  // Variable size. Determine dynamically.
-  return MachNode::size(ra_);
-}
-
 int MachPrologNode::reloc() const {
   // Return number of relocatable values contained in this instruction.
   return 1; // One reloc entry for load_const(toc).
 }
 
@@ -1205,15 +1199,10 @@
     __ relocate(relocInfo::poll_return_type);
     __ load_from_polling_page(Z_R1_scratch);
   }
 }
 
-uint MachEpilogNode::size(PhaseRegAlloc *ra_) const {
-  // Variable size. determine dynamically.
-  return MachNode::size(ra_);
-}
-
 int MachEpilogNode::reloc() const {
   // Return number of relocatable values contained in this instruction.
   return 1; // One for load_from_polling_page.
 }
 
@@ -1614,10 +1603,22 @@
 
 %} // end source_hpp section
 
 source %{
 
+#ifndef PRODUCT
+void MachVEPNode::format(PhaseRegAlloc* ra_, outputStream* st) const
+{
+  Unimplemented();
+}
+#endif
+
+void MachVEPNode::emit(C2_MacroAssembler *masm, PhaseRegAlloc* ra_) const
+{
+  Unimplemented();
+}
+
 #if !defined(PRODUCT)
 void MachUEPNode::format(PhaseRegAlloc *ra_, outputStream *os) const {
   os->print_cr("---- MachUEPNode ----");
   os->print_cr("\tTA");
   os->print_cr("\tload_const Z_R1, SharedRuntime::get_ic_miss_stub()");
@@ -1633,15 +1634,10 @@
 void MachUEPNode::emit(C2_MacroAssembler *masm, PhaseRegAlloc *ra_) const {
   // This is Unverified Entry Point
   __ ic_check(CodeEntryAlignment);
 }
 
-uint MachUEPNode::size(PhaseRegAlloc *ra_) const {
-  // Determine size dynamically.
-  return MachNode::size(ra_);
-}
-
 //=============================================================================
 
 %} // interrupt source section
 
 source_hpp %{ // Header information of the source block.