return VM_Offset.fromInt(USABLE_BUFFER_BYTES - BYTES_IN_ADDRESS - (USABLE_BUFFER_BYTES % (arity<<LOG_BYTES_IN_ADDRESS)));
return VM_Offset.fromIntZeroExtend(USABLE_BUFFER_BYTES - BYTES_IN_ADDRESS - (USABLE_BUFFER_BYTES % (arity<<LOG_BYTES_IN_ADDRESS)));
  protected final VM_Offset bufferLastOffset(int arity) throws VM_PragmaInline {    return VM_Offset.fromInt(USABLE_BUFFER_BYTES - BYTES_IN_ADDRESS                              - (USABLE_BUFFER_BYTES % (arity<<LOG_BYTES_IN_ADDRESS)));  }