tree-sra.c (build_ref_for_offset_1): Allow for zero size fields.

2010-01-21  Martin Jambor  <mjambor@suse.cz>

	* tree-sra.c (build_ref_for_offset_1): Allow for zero size fields.

From-SVN: r156155

gcc/ChangeLog

+2010-01-21  Martin Jambor  <mjambor@suse.cz>
+
+	* tree-sra.c (build_ref_for_offset_1): Allow for zero size fields.
+
 2010-01-21  Andrew Haley  <aph@redhat.com>
 
         * gcc.c (process_command): Move lang_specific_driver before

gcc/tree-sra.c

@@ -1288,7 +1288,12 @@ build_ref_for_offset_1 (tree *res, tree type, HOST_WIDE_INT offset,
 	      if (!tr_size || !host_integerp (tr_size, 1))
 		continue;
 	      size = tree_low_cst (tr_size, 1);
-	      if (pos > offset || (pos + size) <= offset)
+	      if (size == 0)
+		{
+		  if (pos != offset)
+		    continue;
+		}
+	      else if (pos > offset || (pos + size) <= offset)
 		continue;
 
 	      if (res)