| /* Single entry single exit control flow regions. |
| Copyright (C) 2008-2017 Free Software Foundation, Inc. |
| Contributed by Jan Sjodin <jan.sjodin@amd.com> and |
| Sebastian Pop <sebastian.pop@amd.com>. |
| |
| 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_SESE_H |
| #define GCC_SESE_H |
| |
| typedef struct ifsese_s *ifsese; |
| |
| /* A Single Entry, Single Exit region is a part of the CFG delimited |
| by two edges. */ |
| struct sese_l |
| { |
| sese_l (edge e, edge x) : entry (e), exit (x) {} |
| |
| operator bool () const { return entry && exit; } |
| |
| edge entry; |
| edge exit; |
| }; |
| |
| void print_edge (FILE *file, const_edge e); |
| void print_sese (FILE *file, const sese_l &s); |
| void dump_edge (const_edge e); |
| void dump_sese (const sese_l &); |
| |
| /* Get the entry of an sese S. */ |
| |
| static inline basic_block |
| get_entry_bb (sese_l &s) |
| { |
| return s.entry->dest; |
| } |
| |
| /* Get the exit of an sese S. */ |
| |
| static inline basic_block |
| get_exit_bb (sese_l &s) |
| { |
| return s.exit->src; |
| } |
| |
| /* Returns the index of V where ELEM can be found. -1 Otherwise. */ |
| template<typename T> |
| int |
| vec_find (const vec<T> &v, const T &elem) |
| { |
| int i; |
| T t; |
| FOR_EACH_VEC_ELT (v, i, t) |
| if (elem == t) |
| return i; |
| return -1; |
| } |
| |
| /* A helper structure for bookkeeping information about a scop in graphite. */ |
| typedef struct sese_info_t |
| { |
| /* The SESE region. */ |
| sese_l region; |
| |
| /* Liveout vars. */ |
| bitmap liveout; |
| |
| /* Liveout in debug stmts. */ |
| bitmap debug_liveout; |
| |
| /* Parameters used within the SCOP. */ |
| vec<tree> params; |
| |
| /* Maps an old name to a new decl. */ |
| hash_map<tree, tree> *rename_map; |
| |
| /* Basic blocks contained in this SESE. */ |
| vec<basic_block> bbs; |
| |
| /* The condition region generated for this sese. */ |
| ifsese if_region; |
| |
| } *sese_info_p; |
| |
| extern sese_info_p new_sese_info (edge, edge); |
| extern void free_sese_info (sese_info_p); |
| extern void sese_insert_phis_for_liveouts (sese_info_p, basic_block, edge, edge); |
| extern struct loop *outermost_loop_in_sese (sese_l &, basic_block); |
| extern tree scalar_evolution_in_region (const sese_l &, loop_p, tree); |
| extern bool scev_analyzable_p (tree, sese_l &); |
| extern bool invariant_in_sese_p_rec (tree, const sese_l &, bool *); |
| extern void sese_build_liveouts (sese_info_p); |
| extern bool sese_trivially_empty_bb_p (basic_block); |
| |
| /* The number of parameters in REGION. */ |
| |
| static inline unsigned |
| sese_nb_params (sese_info_p region) |
| { |
| return region->params.length (); |
| } |
| |
| /* Checks whether BB is contained in the region delimited by ENTRY and |
| EXIT blocks. */ |
| |
| static inline bool |
| bb_in_region (const_basic_block bb, const_basic_block entry, const_basic_block exit) |
| { |
| /* FIXME: PR67842. */ |
| #if 0 |
| if (flag_checking) |
| { |
| edge e; |
| edge_iterator ei; |
| |
| /* Check that there are no edges coming in the region: all the |
| predecessors of EXIT are dominated by ENTRY. */ |
| FOR_EACH_EDGE (e, ei, exit->preds) |
| gcc_assert (dominated_by_p (CDI_DOMINATORS, e->src, entry)); |
| } |
| #endif |
| |
| return dominated_by_p (CDI_DOMINATORS, bb, entry) |
| && !(dominated_by_p (CDI_DOMINATORS, bb, exit) |
| && !dominated_by_p (CDI_DOMINATORS, entry, exit)); |
| } |
| |
| /* Checks whether BB is contained in the region delimited by ENTRY and |
| EXIT blocks. */ |
| |
| static inline bool |
| bb_in_sese_p (basic_block bb, const sese_l &r) |
| { |
| return bb_in_region (bb, r.entry->dest, r.exit->dest); |
| } |
| |
| /* Returns true when STMT is defined in REGION. */ |
| |
| static inline bool |
| stmt_in_sese_p (gimple *stmt, const sese_l &r) |
| { |
| basic_block bb = gimple_bb (stmt); |
| return bb && bb_in_sese_p (bb, r); |
| } |
| |
| /* Returns true when NAME is defined in REGION. */ |
| |
| static inline bool |
| defined_in_sese_p (tree name, const sese_l &r) |
| { |
| return stmt_in_sese_p (SSA_NAME_DEF_STMT (name), r); |
| } |
| |
| /* Returns true when LOOP is in REGION. */ |
| |
| static inline bool |
| loop_in_sese_p (struct loop *loop, const sese_l ®ion) |
| { |
| return (bb_in_sese_p (loop->header, region) |
| && bb_in_sese_p (loop->latch, region)); |
| } |
| |
| /* Returns the loop depth of LOOP in REGION. The loop depth |
| is the same as the normal loop depth, but limited by a region. |
| |
| Example: |
| |
| loop_0 |
| loop_1 |
| { |
| S0 |
| <- region start |
| S1 |
| |
| loop_2 |
| S2 |
| |
| S3 |
| <- region end |
| } |
| |
| loop_0 does not exist in the region -> invalid |
| loop_1 exists, but is not completely contained in the region -> depth 0 |
| loop_2 is completely contained -> depth 1 */ |
| |
| static inline unsigned int |
| sese_loop_depth (const sese_l ®ion, loop_p loop) |
| { |
| unsigned int depth = 0; |
| |
| while (loop_in_sese_p (loop, region)) |
| { |
| depth++; |
| loop = loop_outer (loop); |
| } |
| |
| return depth; |
| } |
| |
| /* A single entry single exit specialized for conditions. */ |
| |
| typedef struct ifsese_s { |
| sese_info_p region; |
| sese_info_p true_region; |
| sese_info_p false_region; |
| } *ifsese; |
| |
| extern ifsese move_sese_in_condition (sese_info_p); |
| extern void set_ifsese_condition (ifsese, tree); |
| extern edge get_true_edge_from_guard_bb (basic_block); |
| extern edge get_false_edge_from_guard_bb (basic_block); |
| |
| static inline edge |
| if_region_entry (ifsese if_region) |
| { |
| return if_region->region->region.entry; |
| } |
| |
| static inline edge |
| if_region_exit (ifsese if_region) |
| { |
| return if_region->region->region.exit; |
| } |
| |
| static inline basic_block |
| if_region_get_condition_block (ifsese if_region) |
| { |
| return if_region_entry (if_region)->dest; |
| } |
| |
| /* Free and compute again all the dominators information. */ |
| |
| static inline void |
| recompute_all_dominators (void) |
| { |
| mark_irreducible_loops (); |
| free_dominance_info (CDI_DOMINATORS); |
| calculate_dominance_info (CDI_DOMINATORS); |
| |
| free_dominance_info (CDI_POST_DOMINATORS); |
| calculate_dominance_info (CDI_POST_DOMINATORS); |
| } |
| |
| typedef std::pair <gimple *, tree> scalar_use; |
| |
| typedef struct gimple_poly_bb |
| { |
| basic_block bb; |
| struct poly_bb *pbb; |
| |
| /* Lists containing the restrictions of the conditional statements |
| dominating this bb. This bb can only be executed, if all conditions |
| are true. |
| |
| Example: |
| |
| for (i = 0; i <= 20; i++) |
| { |
| A |
| |
| if (2i <= 8) |
| B |
| } |
| |
| So for B there is an additional condition (2i <= 8). |
| |
| List of COND_EXPR and SWITCH_EXPR. A COND_EXPR is true only if the |
| corresponding element in CONDITION_CASES is not NULL_TREE. For a |
| SWITCH_EXPR the corresponding element in CONDITION_CASES is a |
| CASE_LABEL_EXPR. */ |
| vec<gimple *> conditions; |
| vec<gimple *> condition_cases; |
| vec<data_reference_p> data_refs; |
| vec<scalar_use> read_scalar_refs; |
| vec<tree> write_scalar_refs; |
| } *gimple_poly_bb_p; |
| |
| #define GBB_BB(GBB) (GBB)->bb |
| #define GBB_PBB(GBB) (GBB)->pbb |
| #define GBB_DATA_REFS(GBB) (GBB)->data_refs |
| #define GBB_CONDITIONS(GBB) (GBB)->conditions |
| #define GBB_CONDITION_CASES(GBB) (GBB)->condition_cases |
| |
| /* Return the innermost loop that contains the basic block GBB. */ |
| |
| static inline struct loop * |
| gbb_loop (gimple_poly_bb_p gbb) |
| { |
| return GBB_BB (gbb)->loop_father; |
| } |
| |
| /* Returns the gimple loop, that corresponds to the loop_iterator_INDEX. |
| If there is no corresponding gimple loop, we return NULL. */ |
| |
| static inline loop_p |
| gbb_loop_at_index (gimple_poly_bb_p gbb, sese_l ®ion, int index) |
| { |
| loop_p loop = gbb_loop (gbb); |
| int depth = sese_loop_depth (region, loop); |
| |
| while (--depth > index) |
| loop = loop_outer (loop); |
| |
| gcc_assert (loop_in_sese_p (loop, region)); |
| |
| return loop; |
| } |
| |
| /* The number of common loops in REGION for GBB1 and GBB2. */ |
| |
| static inline int |
| nb_common_loops (sese_l ®ion, gimple_poly_bb_p gbb1, gimple_poly_bb_p gbb2) |
| { |
| loop_p l1 = gbb_loop (gbb1); |
| loop_p l2 = gbb_loop (gbb2); |
| loop_p common = find_common_loop (l1, l2); |
| |
| return sese_loop_depth (region, common); |
| } |
| |
| #endif |