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/* Communication between registering jump thread requests and
updating the SSA/CFG for jump threading.
Copyright (C) 2013-2016 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 _TREE_SSA_THREADUPDATE_H
#define _TREE_SSA_THREADUPDATE_H 1
/* In tree-ssa-threadupdate.c. */
extern bool thread_through_all_blocks (bool);
enum jump_thread_edge_type
{
EDGE_START_JUMP_THREAD,
EDGE_FSM_THREAD,
EDGE_COPY_SRC_BLOCK,
EDGE_COPY_SRC_JOINER_BLOCK,
EDGE_NO_COPY_SRC_BLOCK
};
class jump_thread_edge
{
public:
jump_thread_edge (edge e, enum jump_thread_edge_type type)
: e (e), type (type) {}
edge e;
enum jump_thread_edge_type type;
};
extern void register_jump_thread (vec <class jump_thread_edge *> *);
extern void remove_jump_threads_including (edge);
extern void delete_jump_thread_path (vec <class jump_thread_edge *> *);
extern void remove_ctrl_stmt_and_useless_edges (basic_block, basic_block);
extern void free_dom_edge_info (edge);
enum bb_dom_status
{
/* BB does not dominate latch of the LOOP. */
DOMST_NONDOMINATING,
/* The LOOP is broken (there is no path from the header to its latch. */
DOMST_LOOP_BROKEN,
/* BB dominates the latch of the LOOP. */
DOMST_DOMINATING
};
enum bb_dom_status determine_bb_domination_status (struct loop *, basic_block);
#endif
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