new gdb arch routine FRAME_UNCHANGED

[David Mosberger]

>>>>> On Mon, 13 May 2002 19:14:32 -0400, Andrew Cagney <ac131313@cygnus.com> said:

  Andrew> My brain hurts!  This is increasingly like floating point
  Andrew> with +0 != -0.  We have a situtation where for:

  Andrew> 	frame_id a, b; // contain both SP's and PC

  Andrew> the test:

  Andrew> 	!FRAME_ID_INNER_THAN(a,b) && !FRAME_INNER_THAN(b,a)

  Andrew> does not imply

  Andrew> 	FRAME_ID_SAME(a,b)

  Andrew> (or what ever the functions are called).

If you define FRAME_ID_INNER_THAN(a,b) as:

	((a.bsp > b.bsp) || (a.sp < b.sp))

then the relationship should still hold (assuming "bsp" represents the
register stack pointer and sp the memory stack pointer).

	--david