Use OEP_ADDRESS_OF in emit-rtl.c

[Jan Hubicka]

Hi,
adding some extra sanity checks to operand_equal_p made me to notice that uses
of operand_equal_p in mem attrs really care about addresses only.  The 
expression
is tree of the original memory acces MEM RTX was created from and thus the
comparsions should be done with OEP_ADDRESS_OF.

Bootstrapped/regtested x86_64-linux, OK?

Honza

        * emit-rtl.c (mem_attrs_eq_p, mem_expr_equal_p): Pass OEP_ADDRESS_OF
        to operand_equal_p.

Index: emit-rtl.c
===================================================================
--- emit-rtl.c  (revision 228131)
+++ emit-rtl.c  (working copy)
@@ -334,7 +334,7 @@ mem_attrs_eq_p (const struct mem_attrs *
          && p->addrspace == q->addrspace
          && (p->expr == q->expr
              || (p->expr != NULL_TREE && q->expr != NULL_TREE
-                 && operand_equal_p (p->expr, q->expr, 0))));
+                 && operand_equal_p (p->expr, q->expr, OEP_ADDRESS_OF))));
 }
 
 /* Set MEM's memory attributes so that they are the same as ATTRS.  */
@@ -1657,7 +1657,7 @@ mem_expr_equal_p (const_tree expr1, cons
   if (TREE_CODE (expr1) != TREE_CODE (expr2))
     return 0;
 
-  return operand_equal_p (expr1, expr2, 0);
+  return operand_equal_p (expr1, expr2, OEP_ADDRESS_OF);
 }
 
 /* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN