tree-ssa-ccp.c (maybe_fold_offset_to_reference): Do not strip components for unknown size accesses.

2008-08-15  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-ccp.c (maybe_fold_offset_to_reference): Do not
	strip components for unknown size accesses.

From-SVN: r139129

gcc/ChangeLog

+2008-08-15  Richard Guenther  <rguenther@suse.de>
+
+	* tree-ssa-ccp.c (maybe_fold_offset_to_reference): Do not
+	strip components for unknown size accesses.
+
 2008-08-15  Wolfgang Gellerich  <gellerich@de.ibm.com>
 
 	* config/s390/2097.md New file.

gcc/tree-ssa-ccp.c

@@ -1976,6 +1976,7 @@ maybe_fold_offset_to_reference (tree base, tree offset, tree orig_type)
 					     &size, &maxsize);
 	  gcc_assert (newbase);
 	  if (size == maxsize
+	      && size != -1
 	      && !(sub_offset & (BITS_PER_UNIT - 1)))
 	    {
 	      base = newbase;