hash-set.h (hash_set::empty): New.

	* hash-set.h (hash_set::empty): New.
	* tree-ssa-threadbackward.h: Delete.
	* tree-ssa-threadbackward.c (class thread_jumps): New.
	Move max_threaded_paths into class.
	(fsm_find_thread_path): Remove arguments that are now in class.
	(profitable_jump_thread_path): Rename to...
	(thread_jumps::profitable_jump_thread_path): ...this.
	(convert_and_register_jump_thread_path): Rename to...
	(thread_jumps::convert_and_register_current_path): ...this.
	(check_subpath_and_update_thread_path): Rename to...
	(thread_jumps::check_subpath_and_update_thread_path): ...this.
	(register_jump_thread_path_if_profitable): Rename to...
	(thread_jumps::register_jump_thread_path_if_profitable): ...this.
	(handle_phi): Rename to...
	(thread_jumps::handle_phi): ...this.
	(handle_assignment): Rename to...
	(thread_jumps::handle_assignment): ...this.
	(fsm_find_control_statement_thread_paths): Rename to...
	(thread_jumps::fsm_find_control_statement_thread_paths): ...this.
	(find_jump_threads_backwards): Rename to...
	(thread_jumps::find_jump_threads_backwards): ...this.
	Initialize path local data.
	(pass_thread_jumps::execute): Call find_jump_threads_backwards
	from within thread_jumps class.
	(pass_early_thread_jumps::execute): Same.

From-SVN: r254913

gcc/ChangeLog

+2017-11-18  Aldy Hernandez  <aldyh@redhat.com>
+
+	* hash-set.h (hash_set::empty): New.
+	* tree-ssa-threadbackward.h: Delete.
+	* tree-ssa-threadbackward.c (class thread_jumps): New.
+	Move max_threaded_paths into class.
+	(fsm_find_thread_path): Remove arguments that are now in class.
+	(profitable_jump_thread_path): Rename to...
+	(thread_jumps::profitable_jump_thread_path): ...this.
+	(convert_and_register_jump_thread_path): Rename to...
+	(thread_jumps::convert_and_register_current_path): ...this.
+	(check_subpath_and_update_thread_path): Rename to...
+	(thread_jumps::check_subpath_and_update_thread_path): ...this.
+	(register_jump_thread_path_if_profitable): Rename to...
+	(thread_jumps::register_jump_thread_path_if_profitable): ...this.
+	(handle_phi): Rename to...
+	(thread_jumps::handle_phi): ...this.
+	(handle_assignment): Rename to...
+	(thread_jumps::handle_assignment): ...this.
+	(fsm_find_control_statement_thread_paths): Rename to...
+	(thread_jumps::fsm_find_control_statement_thread_paths): ...this.
+	(find_jump_threads_backwards): Rename to...
+	(thread_jumps::find_jump_threads_backwards): ...this.
+	Initialize path local data.
+	(pass_thread_jumps::execute): Call find_jump_threads_backwards
+	from within thread_jumps class.
+	(pass_early_thread_jumps::execute): Same.
+
 2017-11-17  Jan Hubicka  <hubicka@ucw.cz>
 
 	* cgraph.c (cgraph_node::dump): Do IPA sanity checking on IPA counts.

gcc/hash-set.h

@@ -80,6 +80,10 @@ public:
 
   size_t elements () const { return m_table.elements (); }
 
+  /* Clear the hash table.  */
+
+  void empty () { m_table.empty (); }
+
   class iterator
   {
   public:

gcc/tree-ssa-threadbackward.h

-/* Header file for SSA dominator optimizations.
-   Copyright (C) 2013-2017 Free Software Foundation, Inc.
-
-This file is part of GCC.
-
-GCC is free software; you can redistribute it and/or modify it under
-the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 3, or (at your option) any later
-version.
-
-GCC is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY; without even the implied warranty of MERCHANTABILITY or
-FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- for more details.
-
-You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING3.  If not see
-<http://www.gnu.org/licenses/>.  */
-
-#ifndef GCC_TREE_SSA_THREADFSM_H
-#define GCC_TREE_SSA_THREADFSM_H
-
-extern void find_jump_threads_backwards (edge);
-
-#endif /* GCC_TREE_SSA_THREADFSM_H */