tree.h (can_trust_pointer_alignment): Remove.

2011-08-10  Richard Guenther  <rguenther@suse.de>

	* tree.h (can_trust_pointer_alignment): Remove.
	* builtins.c (can_trust_pointer_alignment): Remove.

	cp/
	* call.c (build_over_call): Call memcpy unconditionally.

From-SVN: r177625

gcc/ChangeLog

+2011-08-10  Richard Guenther  <rguenther@suse.de>
+
+	* tree.h (can_trust_pointer_alignment): Remove.
+	* builtins.c (can_trust_pointer_alignment): Remove.
+
 2011-08-10  Artjoms Sinkarovs <artyom.shinakroff@gmail.com>
 
 	* c-typeck.c (scalar_to_vector): New function. Try scalar to

gcc/builtins.c

@@ -453,16 +453,6 @@ get_object_alignment (tree exp)
   return align;
 }
 
-/* Returns true iff we can trust that alignment information has been
-   calculated properly.  */
-
-bool
-can_trust_pointer_alignment (void)
-{
-  /* We rely on TER to compute accurate alignment information.  */
-  return (optimize && flag_tree_ter);
-}
-
 /* Return the alignment in bits of EXP, a pointer valued expression.
    The alignment returned is, by default, the alignment of the thing that
    EXP points to.  If it is not a POINTER_TYPE, 0 is returned.

gcc/cp/ChangeLog

+2011-08-10  Richard Guenther  <rguenther@suse.de>
+
+	* call.c (build_over_call): Call memcpy unconditionally.
+
 2011-08-08  Jason Merrill  <jason@redhat.com>
 
 	PR c++/50020

gcc/cp/call.c

@@ -6767,33 +6767,17 @@ build_over_call (struct z_candidate *cand, int flags, tsubst_flags_t complain)
       else
 	{
 	  /* We must only copy the non-tail padding parts.
-	     Use __builtin_memcpy for the bitwise copy.
-	     FIXME fix 22488 so we can go back to using MODIFY_EXPR
-	     instead of an explicit call to memcpy.  */
-	
+	     Use __builtin_memcpy for the bitwise copy.  */
 	  tree arg0, arg1, arg2, t;
-	  tree test = NULL_TREE;
 
 	  arg2 = TYPE_SIZE_UNIT (as_base);
 	  arg1 = arg;
 	  arg0 = cp_build_addr_expr (to, complain);
 
-	  if (!can_trust_pointer_alignment ())
-	    {
-	      /* If we can't be sure about pointer alignment, a call
-		 to __builtin_memcpy is expanded as a call to memcpy, which
-		 is invalid with identical args.  Otherwise it is
-		 expanded as a block move, which should be safe.  */
-	      arg0 = save_expr (arg0);
-	      arg1 = save_expr (arg1);
-	      test = build2 (EQ_EXPR, boolean_type_node, arg0, arg1);
-	    }
 	  t = implicit_built_in_decls[BUILT_IN_MEMCPY];
 	  t = build_call_n (t, 3, arg0, arg1, arg2);
 
 	  t = convert (TREE_TYPE (arg0), t);
-	  if (test)
-	    t = build3 (COND_EXPR, TREE_TYPE (t), test, arg0, t);
 	  val = cp_build_indirect_ref (t, RO_NULL, complain);
           TREE_NO_WARNING (val) = 1;
 	}

gcc/tree.h

@@ -5358,7 +5358,6 @@ extern tree build_va_arg_indirect_ref (tree);
 extern tree build_string_literal (int, const char *);
 extern bool validate_arglist (const_tree, ...);
 extern rtx builtin_memset_read_str (void *, HOST_WIDE_INT, enum machine_mode);
-extern bool can_trust_pointer_alignment (void);
 extern bool is_builtin_name (const char *);
 extern bool is_builtin_fn (tree);
 extern unsigned int get_object_alignment_1 (tree, unsigned HOST_WIDE_INT *);