re PR middle-end/70127 (wrong code on x86_64-linux-gnu at -O3 in 32-bit and 64-bit modes)

	PR tree-optimization/70127
	* fold-const.c (operand_equal_p): Revert the 2015-10-28 change.

	* gcc.c-torture/execute/pr70127.c: New test.

From-SVN: r234090

gcc/ChangeLog

+2016-03-08  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/70127
+	* fold-const.c (operand_equal_p): Revert the 2015-10-28 change.
+
 2016-03-09  David Malcolm  <dmalcolm@redhat.com>
 
 	PR c/68473

gcc/fold-const.c

@@ -3032,6 +3032,9 @@ operand_equal_p (const_tree arg0, const_tree arg1, unsigned int flags)
 					   TYPE_SIZE (TREE_TYPE (arg1)),
 					   flags)))
 		return 0;
+	      /* Verify that access happens in similar types.  */
+	      if (!types_compatible_p (TREE_TYPE (arg0), TREE_TYPE (arg1)))
+		return 0;
 	      /* Verify that accesses are TBAA compatible.  */
 	      if (!alias_ptr_types_compatible_p
 		    (TREE_TYPE (TREE_OPERAND (arg0, 1)),

gcc/testsuite/ChangeLog

+2016-03-08  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/70127
+	* gcc.c-torture/execute/pr70127.c: New test.
+
 2016-03-09  Cesar Philippidis  <cesar@codesourcery.com>
 
 	* c-c++-common/goacc/combined-directives-2.c: New test.

gcc/testsuite/gcc.c-torture/execute/pr70127.c

+/* PR tree-optimization/70127 */
+
+struct S { int f; signed int g : 2; } a[1], c = {5, 1}, d;
+short b;
+
+__attribute__((noinline, noclone)) void
+foo (int x)
+{
+  if (x != 1)
+    __builtin_abort ();
+}
+
+int
+main ()
+{
+  while (b++ <= 0)
+    {
+      struct S e = {1, 1};
+      d = e = a[0] = c;
+    }
+  foo (a[0].g);
+  return 0;
+}