for (int i=0; VM_Extent.fromIntZeroExtend(i).LT(len); i+=4) VM_Magic.setMemoryInt(start.add(i), 0);
VM_Address end = start.add(len); for (VM_Address i = start; i.LT(end); i = i.add(BYTES_IN_INT)) VM_Magic.setMemoryInt(i, 0);
  public static void zeroSmall(VM_Address start, VM_Extent len) throws VM_PragmaInline {    for (int i=0; VM_Extent.fromIntZeroExtend(i).LT(len); i+=4)       VM_Magic.setMemoryInt(start.add(i), 0);  }