1/* Communication between registering jump thread requests and
2 updating the SSA/CFG for jump threading.
3 Copyright (C) 2013-2017 Free Software Foundation, Inc.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 3, or (at your option)
10any later version.
11
12GCC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING3. If not see
19<http://www.gnu.org/licenses/>. */
20
21#ifndef _TREE_SSA_THREADUPDATE_H
22#define _TREE_SSA_THREADUPDATE_H 1
23
24/* In tree-ssa-threadupdate.c. */
25extern bool thread_through_all_blocks (bool);
26enum jump_thread_edge_type
27{
28 EDGE_START_JUMP_THREAD,
29 EDGE_FSM_THREAD,
30 EDGE_COPY_SRC_BLOCK,
31 EDGE_COPY_SRC_JOINER_BLOCK,
32 EDGE_NO_COPY_SRC_BLOCK
33};
34
35class jump_thread_edge
36{
37public:
38 jump_thread_edge (edge e, enum jump_thread_edge_type type)
39 : e (e), type (type) {}
40
41 edge e;
42 enum jump_thread_edge_type type;
43};
44
45extern void register_jump_thread (vec <class jump_thread_edge *> *);
46extern void remove_jump_threads_including (edge);
47extern void delete_jump_thread_path (vec <class jump_thread_edge *> *);
48extern void remove_ctrl_stmt_and_useless_edges (basic_block, basic_block);
49extern void free_dom_edge_info (edge);
50
51enum bb_dom_status
52{
53 /* BB does not dominate latch of the LOOP. */
54 DOMST_NONDOMINATING,
55 /* The LOOP is broken (there is no path from the header to its latch. */
56 DOMST_LOOP_BROKEN,
57 /* BB dominates the latch of the LOOP. */
58 DOMST_DOMINATING
59};
60
61enum bb_dom_status determine_bb_domination_status (struct loop *, basic_block);
62
63#endif
64