emit-rtl.c (set_mem_attributes_minus_bitpos): Adjust SIZE as well as OFFSET for BITPOS.

        * emit-rtl.c (set_mem_attributes_minus_bitpos): Adjust SIZE
        as well as OFFSET for BITPOS.

From-SVN: r57228

gcc/ChangeLog

+2002-09-16  Richard Henderson  <rth@redhat.com>
+
+	* emit-rtl.c (set_mem_attributes_minus_bitpos): Adjust SIZE
+	as well as OFFSET for BITPOS.
+
 2002-09-16  Jeff Garzik  <jgarzik@mandrakesoft.com>
 
         * config.gcc: Treat winchip_c6-*|winchip2-*|c3-* as pentium-mmx.

gcc/emit-rtl.c

@@ -1885,9 +1885,14 @@ set_mem_attributes_minus_bitpos (ref, t, objectp, bitpos)
     }
 
   /* If we modified OFFSET based on T, then subtract the outstanding 
-     bit position offset.  */
+     bit position offset.  Similarly, increase the size of the accessed
+     object to contain the negative offset.  */
   if (apply_bitpos)
-    offset = plus_constant (offset, -(apply_bitpos / BITS_PER_UNIT));
+    {
+      offset = plus_constant (offset, -(apply_bitpos / BITS_PER_UNIT));
+      if (size)
+	size = plus_constant (size, apply_bitpos / BITS_PER_UNIT);
+    }
 
   /* Now set the attributes we computed above.  */
   MEM_ATTRS (ref)