pointer math vs named address spaces

[DJ Delorie <dj at redhat dot com>]

If a target (rl78-elf in my case) has a named address space larger
than the generic address space (__far in my case), why is pointer math
in that named address space still truncated to sizetype?

N1275 recognizes that named address spaces might be a different size
than the generic address space, but I didn't see anything that
required such truncation.


volatile char __far * ptr1;
volatile char __far * ptr2;
uint32_t sival;

foo()
{
  ptr2 = ptr1 + sival;
}

foo ()
{
  volatile <address-space-2> char * ptr2.5;
  sizetype D.2252;
  long unsigned int sival.4;
  volatile <address-space-2> char * ptr1.3;
  sizetype _3;

;;   basic block 2, loop depth 0
;;    pred:       ENTRY
  ptr1.3_1 = ptr1;
  sival.4_2 = sival;
  _3 = (sizetype) sival.4_2;	<------- why this truncation?
  ptr2.5_4 = ptr1.3_1 + _3;
  ptr2 = ptr2.5_4;
  return;
;;    succ:       EXIT

}