[avr-gcc-list] bugfix for cselib_invalidate_regno

[Denis Chertykov]

I have founded a bug in cselib.c:cselib_invalidate_regno.
The avr port triggers this bug.
Current version of cselib_invalidate_regno didn't invalidate lower
register numbers if they contain values that overlap REGNO in case
that (regno < FIRST_PSEUDO_REGISTER && mode == VOIDmode). This happens
if cselib_invalidate_regno called from cselib_process_insn which
handle CALL_INSN.
IE

  /* If this is a call instruction, forget anything stored in a
     call clobbered register, or, if this is not a const call, in
     memory.  */
  if (GET_CODE (insn) == CALL_INSN)
    {
      for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
        if (call_used_regs[i])
          cselib_invalidate_regno (i, VOIDmode);


Can I apply the following patch to mainline and 3.3 branches ?

Denis.


Index: cselib.c
===================================================================
RCS file: /cvsroot/gcc/egcs/gcc/cselib.c,v
retrieving revision 1.27
diff -c -3 -p -r1.27 cselib.c
*** cselib.c    17 Apr 2003 01:07:12 -0000      1.27
--- cselib.c    19 May 2003 11:09:38 -0000
*************** cselib_invalidate_regno (regno, mode)
*** 1019,1032 ****
       pseudos, only REGNO is affected.  For hard regs, we must take MODE
       into account, and we must also invalidate lower register numbers
       if they contain values that overlap REGNO.  */
!   if (regno < FIRST_PSEUDO_REGISTER && mode != VOIDmode) 
      {
        if (regno < max_value_regs)
        i = 0;
        else
        i = regno - max_value_regs;
  
!       endregno = regno + HARD_REGNO_NREGS (regno, mode);
      }
    else
      {
--- 1019,1033 ----
       pseudos, only REGNO is affected.  For hard regs, we must take MODE
       into account, and we must also invalidate lower register numbers
       if they contain values that overlap REGNO.  */
!   if (regno < FIRST_PSEUDO_REGISTER)
      {
        if (regno < max_value_regs)
        i = 0;
        else
        i = regno - max_value_regs;
  
!       endregno = regno
!       + (mode != VOIDmode ? HARD_REGNO_NREGS (regno, mode) : 1);
      }
    else
      {