re PR tree-optimization/39343 (Wrong result for __builtin_object_size (x, 1))

	PR tree-optimization/39343
	* tree-ssa-ccp.c (maybe_fold_offset_to_address): Don't check if
	COMPONENT_REF t has ARRAY_TYPE.

	* gcc.dg/pr39343.c: New test.

From-SVN: r144571

gcc/ChangeLog

+2009-03-03  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/39343
+	* tree-ssa-ccp.c (maybe_fold_offset_to_address): Don't check if
+	COMPONENT_REF t has ARRAY_TYPE.
+
 2009-03-02  Sebastian Pop  <sebastian.pop@amd.com>
 
 	PR middle-end/39335

gcc/testsuite/ChangeLog

+2009-03-03  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/39343
+	* gcc.dg/pr39343.c: New test.
+
 2009-03-03  Ira Rosen  <irar@il.ibm.com>
 
 	PR tree-optimization/39248

gcc/testsuite/gcc.dg/pr39343.c

+/* PR tree-optimization/39343 */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+extern void abort (void);
+
+extern inline __attribute__ ((__always_inline__)) int
+foo (char *dest)
+{
+  return __builtin_object_size (dest, 1);
+}
+
+struct S
+{
+  union
+  {
+    struct { int a, b; char c, d; } f;
+    struct { struct { int a, b; char c, d[255]; } e; } g;
+  } u;
+};
+
+int
+main (void)
+{
+  struct S s;
+  if (foo (s.u.g.e.d) != 255)
+    abort ();
+  return 0;
+}

gcc/tree-ssa-ccp.c

@@ -1942,8 +1942,7 @@ maybe_fold_offset_to_address (tree addr, tree offset, tree orig_type)
 	   || (TREE_CODE (orig) == COMPONENT_REF
 	       && TREE_CODE (TREE_TYPE (TREE_OPERAND (orig, 1))) == ARRAY_TYPE))
 	  && (TREE_CODE (t) == ARRAY_REF
-	      || (TREE_CODE (t) == COMPONENT_REF
-		  && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 1))) == ARRAY_TYPE))
+	      || TREE_CODE (t) == COMPONENT_REF)
 	  && !operand_equal_p (TREE_CODE (orig) == ARRAY_REF
 			       ? TREE_OPERAND (orig, 0) : orig,
 			       TREE_CODE (t) == ARRAY_REF