2003-05-11  Philip Blundell  <philb@gnu.org>

	* config/arm/arm.c (adjacent_mem_locations): Reject offsets
	involving invalid constants.  [PR 10730]

Index: config/arm/arm.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/arm/arm.c,v
retrieving revision 1.271
diff -u -p -r1.271 arm.c
--- config/arm/arm.c	10 May 2003 13:10:46 -0000	1.271
+++ config/arm/arm.c	11 May 2003 12:30:31 -0000
@@ -4567,6 +4571,12 @@ adjacent_mem_locations (a, b)
       else
 	reg1 = REGNO (XEXP (b, 0));
 
+      /* Don't accept any offset that will require multiple instructions to handle,
+	 since this would cause the arith_adjacentmem pattern to output an overlong
+	 sequence.  */
+      if (!const_ok_for_arm (val0) || !const_ok_for_arm (val1))
+	return 0;
+      
       return (reg0 == reg1) && ((val1 - val0) == 4 || (val0 - val1) == 4);
     }
   return 0;