64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
/* Communication between registering jump thread requests and
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updating the SSA/CFG for jump threading.
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Copyright (C) 2013-2017 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef _TREE_SSA_THREADUPDATE_H
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#define _TREE_SSA_THREADUPDATE_H 1
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/* In tree-ssa-threadupdate.c. */
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extern bool thread_through_all_blocks (bool);
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enum jump_thread_edge_type
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{
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EDGE_START_JUMP_THREAD,
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EDGE_FSM_THREAD,
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EDGE_COPY_SRC_BLOCK,
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EDGE_COPY_SRC_JOINER_BLOCK,
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EDGE_NO_COPY_SRC_BLOCK
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};
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class jump_thread_edge
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{
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public:
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jump_thread_edge (edge e, enum jump_thread_edge_type type)
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: e (e), type (type) {}
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edge e;
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enum jump_thread_edge_type type;
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};
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extern void register_jump_thread (vec <class jump_thread_edge *> *);
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extern void remove_jump_threads_including (edge);
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extern void delete_jump_thread_path (vec <class jump_thread_edge *> *);
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extern void remove_ctrl_stmt_and_useless_edges (basic_block, basic_block);
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extern void free_dom_edge_info (edge);
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enum bb_dom_status
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{
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/* BB does not dominate latch of the LOOP. */
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DOMST_NONDOMINATING,
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/* The LOOP is broken (there is no path from the header to its latch. */
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DOMST_LOOP_BROKEN,
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/* BB dominates the latch of the LOOP. */
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DOMST_DOMINATING
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};
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enum bb_dom_status determine_bb_domination_status (struct loop *, basic_block);
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#endif
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