Index: expr.c
===================================================================
*** expr.c	(revision 141714)
--- expr.c	(working copy)
*************** expand_expr_real_1 (tree exp, rtx target
*** 8324,8329 ****
--- 8324,8337 ----
        /* Even though the sizetype mode and the pointer's mode can be different
           expand is able to handle this correctly and get the correct result out 
           of the PLUS_EXPR code.  */
+       /* Make sure to sign-extend the sizetype offset in a POINTER_PLUS_EXPR
+          if sizetype precision is smaller than pointer precision.  */
+       if (TYPE_PRECISION (sizetype) < TYPE_PRECISION (type))
+ 	exp = build2 (PLUS_EXPR, type,
+ 		      TREE_OPERAND (exp, 0),
+ 		      fold_convert (type,
+ 				    fold_convert (ssizetype,
+ 						  TREE_OPERAND (exp, 1))));
      case PLUS_EXPR:
  
        /* Check if this is a case for multiplication and addition.  */