patch to plus_constant_wide

[Joern Rennecke]

This patch fixes a problem that all_constant was ignored when processing PLUS:

Tue Dec  8 22:33:18 1998  J"orn Rennecke <amylaar@cygnus.co.uk>

	* explow.c (plus_constant_wide): Don't immediately return with
	result of recursive call.

Index: explow.c
===================================================================
RCS file: /egcs/carton/cvsfiles/egcs/gcc/explow.c,v
retrieving revision 1.18
diff -p -r1.18 explow.c
*** explow.c	1998/11/20 07:37:33	1.18
--- explow.c	1998/12/08 22:33:44
*************** plus_constant_wide (x, c)
*** 116,134 ****
  	 integer.  For a constant term that is not an explicit integer,
  	 we cannot really combine, but group them together anyway.  
  
! 	 Use a recursive call in case the remaining operand is something
! 	 that we handle specially, such as a SYMBOL_REF.  */
  
        if (GET_CODE (XEXP (x, 1)) == CONST_INT)
! 	return plus_constant (XEXP (x, 0), c + INTVAL (XEXP (x, 1)));
        else if (CONSTANT_P (XEXP (x, 0)))
! 	return gen_rtx_PLUS (mode,
! 			     plus_constant (XEXP (x, 0), c),
! 			     XEXP (x, 1));
        else if (CONSTANT_P (XEXP (x, 1)))
! 	return gen_rtx_PLUS (mode,
! 			     XEXP (x, 0),
! 			     plus_constant (XEXP (x, 1), c));
        break;
        
      default:
--- 116,147 ----
  	 integer.  For a constant term that is not an explicit integer,
  	 we cannot really combine, but group them together anyway.  
  
! 	 Restart or use a recursive call in case the remaining operand is
! 	 something that we handle specially, such as a SYMBOL_REF.
  
+ 	 We may not immediately return from the recursive call here, lest
+ 	 all_constant gets lost.  */
+ 
        if (GET_CODE (XEXP (x, 1)) == CONST_INT)
! 	{
! 	  c += INTVAL (XEXP (x, 1));
! 	  x = XEXP (x, 0);
! 	  goto restart;
! 	}
        else if (CONSTANT_P (XEXP (x, 0)))
! 	{
! 	  x = gen_rtx_PLUS (mode,
! 			    plus_constant (XEXP (x, 0), c),
! 			    XEXP (x, 1));
! 	  c = 0;
! 	}
        else if (CONSTANT_P (XEXP (x, 1)))
! 	{
! 	  x = gen_rtx_PLUS (mode,
! 			    XEXP (x, 0),
! 			    plus_constant (XEXP (x, 1), c));
! 	  c = 0;
! 	}
        break;
        
      default: