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111
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1 /* Communication between registering jump thread requests and
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2 updating the SSA/CFG for jump threading.
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3 Copyright (C) 2013-2017 Free Software Foundation, Inc.
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3, or (at your option)
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10 any later version.
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11
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12 GCC is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 #ifndef _TREE_SSA_THREADUPDATE_H
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22 #define _TREE_SSA_THREADUPDATE_H 1
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23
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24 /* In tree-ssa-threadupdate.c. */
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25 extern bool thread_through_all_blocks (bool);
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26 enum jump_thread_edge_type
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27 {
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28 EDGE_START_JUMP_THREAD,
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29 EDGE_FSM_THREAD,
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30 EDGE_COPY_SRC_BLOCK,
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31 EDGE_COPY_SRC_JOINER_BLOCK,
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32 EDGE_NO_COPY_SRC_BLOCK
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33 };
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34
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35 class jump_thread_edge
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36 {
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37 public:
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38 jump_thread_edge (edge e, enum jump_thread_edge_type type)
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39 : e (e), type (type) {}
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40
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41 edge e;
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42 enum jump_thread_edge_type type;
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43 };
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44
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45 extern void register_jump_thread (vec <class jump_thread_edge *> *);
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46 extern void remove_jump_threads_including (edge);
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47 extern void delete_jump_thread_path (vec <class jump_thread_edge *> *);
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48 extern void remove_ctrl_stmt_and_useless_edges (basic_block, basic_block);
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49 extern void free_dom_edge_info (edge);
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50
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51 enum bb_dom_status
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52 {
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53 /* BB does not dominate latch of the LOOP. */
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54 DOMST_NONDOMINATING,
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55 /* The LOOP is broken (there is no path from the header to its latch. */
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56 DOMST_LOOP_BROKEN,
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57 /* BB dominates the latch of the LOOP. */
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58 DOMST_DOMINATING
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59 };
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60
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61 enum bb_dom_status determine_bb_domination_status (struct loop *, basic_block);
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62
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63 #endif
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