re PR tree-optimization/71239 (ICE in operand_equal_p (fold-const.c:2769))

Fix PR tree-optimization/71239.

	* g++.dg/pr71239.C: New test.
	PR tree-optimization/71239
	* tree.c (array_at_struct_end_p): Do not call operand_equal_p
	if DECL_SIZE is NULL.

From-SVN: r236696

gcc/ChangeLog

+2016-05-25  Martin Liska  <mliska@suse.cz>
+
+	PR tree-optimization/71239
+	* tree.c (array_at_struct_end_p): Do not call operand_equal_p
+	if DECL_SIZE is NULL.
+
 2016-05-25  Richard Biener  <rguenther@suse.de>
 
 	* timevar.def (TV_TREE_LOOP_IFCVT): Add.

gcc/testsuite/ChangeLog

+2016-05-25  Martin Liska  <mliska@suse.cz>
+
+	* g++.dg/pr71239.C: New test.
+
 2016-05-25  Richard Biener  <rguenther@suse.de>
 
 	* gcc/testsuite/gcc.dg/vect/pr58135.c: Rename to ...

gcc/tree.c

@@ -13097,7 +13097,8 @@ array_at_struct_end_p (tree ref)
 
 	 is valid because BUF allocate enough space.  */
 
-      && (!size || operand_equal_p (DECL_SIZE (ref), size, 0))
+      && (!size || (DECL_SIZE (ref) != NULL
+		    && operand_equal_p (DECL_SIZE (ref), size, 0)))
       && !(flag_unconstrained_commons
 	   && TREE_CODE (ref) == VAR_DECL && DECL_COMMON (ref)))
     return false;