cfgloopmanip.h

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/* Loop manipulation header.
   Copyright (C) 2014-2026 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 GCC_CFGLOOPMANIP_H
#define GCC_CFGLOOPMANIP_H
 
enum
{
  CP_SIMPLE_PREHEADERS = 1,
  CP_FALLTHRU_PREHEADERS = 2
};
 
#define DLTHE_FLAG_UPDATE_FREQ  1       /* Update frequencies in
                                           duplicate_loop_to_header_edge.  */
#define DLTHE_RECORD_COPY_NUMBER 2      /* Record copy number in the aux
                                           field of newly create BB.  */
#define DLTHE_FLAG_COMPLETTE_PEEL 4     /* Update frequencies expecting
                                           a complete peeling.  */
#define DLTHE_FLAG_FLAT_PROFILE 8       /* Profile is flat; do not reduce
                                           count by unroll factor.  */
extern bool remove_path (edge, bool * = NULL, bitmap = NULL);
extern void place_new_loop (struct function *, class loop *);
extern void add_loop (class loop *, class loop *);
extern void scale_loop_frequencies (class loop *, profile_probability);
extern void scale_loop_profile (class loop *, profile_probability, gcov_type);
extern edge create_empty_if_region_on_edge (edge, tree);
extern class loop *create_empty_loop_on_edge (edge, tree, tree, tree, tree,
                                               tree *, tree *, class loop *);
extern void unloop (class loop *, bool *, bitmap);
extern void unloop_loops (vec<class loop *> &loops_to_unloop,
                          vec<int> &loops_to_unloop_nunroll,
                          vec<edge> &edges_to_remove,
                          bitmap loop_closed_ssa_invalidated,
                          bool *irred_invalidated);
extern void copy_loop_info (class loop *loop, class loop *target);
extern class loop * duplicate_loop (class loop *, class loop *,
                                     class loop * = NULL);
extern void duplicate_subloops (class loop *, class loop *);
extern bool can_duplicate_loop_p (const class loop *loop);
extern bool
duplicate_loop_body_to_header_edge (class loop *, edge, unsigned, sbitmap, edge,
                                    vec<edge> *, int);
extern bool mfb_keep_just (edge, void *);
basic_block create_preheader (class loop *, int);
extern void create_preheaders (int);
extern void force_single_succ_latches (void);
class loop * loop_version (class loop *, void *,
                            basic_block *,
                            profile_probability, profile_probability,
                            profile_probability, profile_probability, bool);
void adjust_loop_info_after_peeling (class loop *loop, int npeel, bool precise);
void scale_dominated_blocks_in_loop (class loop *loop, basic_block bb,
                                     profile_count num, profile_count den);
edge update_loop_exit_probability_scale_dom_bbs
                (class loop *loop, edge exit_edge = NULL,
                 profile_count desired_count = profile_count::uninitialized ());
void update_exit_probability_after_unrolling (class loop *loop, edge new_exit);
 
#endif /* GCC_CFGLOOPMANIP_H */