Updated PATCH for expr.c problems (MIPS, 386), 1.1.2 and current

[Jeffrey A Law]

  In message <Pine.BSF.4.02A.9903301943390.13846-100000@dair.pair.com>you write
:
  > Here's an update to the patch in
  > <URL: http://egcs.cygnus.com/ml/egcs-patches/1999-02/msg00796.html >.
  > (It's close, but does not solve the problem you report in
  > <URL: http://egcs.cygnus.com/ml/egcs-bugs/1999-03/msg00973.html >.)
  > 
  > The force_operand is necessary since the address is often (as in
  > <URL: http://egcs.cygnus.com/ml/egcs-bugs/1999-02/msg00786.html >
  > and <URL: http://www.cygnus.com/ml/egcs-bugs/1998-Oct/0928.html >)
  > a (plus ...), which is not correct input for force_reg.  The ptr_mode
  > is because we're dealing with an address; there's no need to look inside
  > the source rtx for the mode.  That's also fatal when dealing with
  > addresses that are const_int:s...
You are _still_ missing the point.  

If you fix the mips backend to not accept addresses that are invalid, then you
will not get the bogus argument to force_reg.

I will not install this patch as-is.  We need to fix the MIPS backend first.

After that we can re-evaluate whether or not we need the expr.c patch.

jeff