for (int i=0; i<len; i+=4)
for (int i=0; i < len; i += BYTES_IN_INT)
  public static void set (VM_Address start, int len, int v) throws VM_PragmaInline {    for (int i=0; i<len; i+=4)       VM_Magic.setMemoryInt(start.add(i), v);  }