re PR middle-end/26643 (Linux matroxfb_probe miscompiled)

	PR tree-optimization/26643
	* tree-ssa-loop-ivopts.c (find_interesting_uses_address): Do not handle
	bit_field_refs.

From-SVN: r112483

gcc/ChangeLog

+2006-03-28  Zdenek Dvorak <dvorakz@suse.cz>
+
+	PR tree-optimization/26643
+	* tree-ssa-loop-ivopts.c (find_interesting_uses_address): Do not handle
+	bit_field_refs.
+
 2006-03-28  Kaz Kojima  <kkojima@gcc.gnu.org>
 
 	* config/sh/sh.md (udivsi3_i4_int): Clobber MACH_REG and MACL_REG.

gcc/tree-ssa-loop-ivopts.c

@@ -1482,8 +1482,9 @@ find_interesting_uses_address (struct ivopts_data *data, tree stmt, tree *op_p)
 
   /* Ignore bitfields for now.  Not really something terribly complicated
      to handle.  TODO.  */
-  if (TREE_CODE (base) == COMPONENT_REF
-      && DECL_NONADDRESSABLE_P (TREE_OPERAND (base, 1)))
+  if (TREE_CODE (base) == BIT_FIELD_REF
+      || (TREE_CODE (base) == COMPONENT_REF
+	  && DECL_NONADDRESSABLE_P (TREE_OPERAND (base, 1))))
     goto fail;
 
   if (STRICT_ALIGNMENT