From mboxrd@z Thu Jan  1 00:00:00 1970
From: thomas joseph <thomascanny@yahoo.co.nz>
To: gcc@gcc.gnu.org
Subject: SUBREG problems
Date: Wed, 05 Sep 2001 06:57:00 -0000
Message-id: <20010905135700.63960.qmail@web14708.mail.yahoo.com>
X-SW-Source: 2001-09/msg00103.html

Hi ALL
 I am working for a new gcc port.I have a small
problem
 with subregs. I am still to confirm whether this
problem is addressed by some body or not.

  On my machine the UNITS_PER_WORD is 2 and I made
longs as 32 bits. So, when they are in registers they 
 need two consecutive registers. I am doing this.

  ALl the opeartions on the machine are 16bit. So, I
am
splitting the long operations in to two 16 bit
operations.

   The problem is with the compare and branch
operations.....

 I have a test program ......

   int main ()
   {
     register long x = 10;

     if (x == 10)
       return 0;
      else
       return 1;
   }

  Here the problem is when  I access the low part and
 high parts of op for my cmp/branch operations 
  the look like

insn 10 8 11 (set (cc0)
        (compare (subreg:HI (reg/v:SI 53) 0)
            (const_int 0 [0x0]))) 15 {cmphi_1} (nil)
    (nil))

 
(insn 12 11 13 (set (cc0)
        (compare (subreg:HI (reg/v:SI 53) 1)
            (const_int 10 [0xa]))) 15 {cmphi_1} (nil)
    (nil))


. When they end up in memory both subregs refer to the

 low parts only. if x is at (ix -4), both refer to (ix
-4) to (ix -2) only. I do n't know where it is going
wrong.......

  Do I need to add some thing in the gen_lowpart and
gen_highpart ??


 Could some body point me at the right place where to
look for this problem.......


 Thanks and regards,

  V.Brahmaiah