1  /* Scalar evolution detector.
       2     Copyright (C) 2003-2023 Free Software Foundation, Inc.
       3     Contributed by Sebastian Pop <s.pop@laposte.net>
       4  
       5  This file is part of GCC.
       6  
       7  GCC is free software; you can redistribute it and/or modify it under
       8  the terms of the GNU General Public License as published by the Free
       9  Software Foundation; either version 3, or (at your option) any later
      10  version.
      11  
      12  GCC is distributed in the hope that it will be useful, but WITHOUT ANY
      13  WARRANTY; without even the implied warranty of MERCHANTABILITY or
      14  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      15  for more details.
      16  
      17  You should have received a copy of the GNU General Public License
      18  along with GCC; see the file COPYING3.  If not see
      19  <http://www.gnu.org/licenses/>.  */
      20  
      21  #ifndef GCC_TREE_SCALAR_EVOLUTION_H
      22  #define GCC_TREE_SCALAR_EVOLUTION_H
      23  
      24  extern tree number_of_latch_executions (class loop *);
      25  extern gcond *get_loop_exit_condition (const class loop *);
      26  
      27  extern void scev_initialize (void);
      28  extern bool scev_initialized_p (void);
      29  extern void scev_reset (void);
      30  extern void scev_reset_htab (void);
      31  extern void scev_finalize (void);
      32  extern tree analyze_scalar_evolution (class loop *, tree);
      33  extern tree instantiate_scev (edge, class loop *, tree);
      34  extern tree resolve_mixers (class loop *, tree, bool *);
      35  extern void gather_stats_on_scev_database (void);
      36  extern bool final_value_replacement_loop (class loop *);
      37  extern unsigned int scev_const_prop (void);
      38  extern bool expression_expensive_p (tree);
      39  extern bool simple_iv_with_niters (class loop *, class loop *, tree,
      40  				   struct affine_iv *, tree *, bool);
      41  extern bool simple_iv (class loop *, class loop *, tree, struct affine_iv *,
      42  		       bool);
      43  extern bool iv_can_overflow_p (class loop *, tree, tree, tree);
      44  extern tree compute_overall_effect_of_inner_loop (class loop *, tree);
      45  
      46  /* Returns the basic block preceding LOOP, or the CFG entry block when
      47     the loop is function's body.  */
      48  
      49  inline basic_block
      50  block_before_loop (loop_p loop)
      51  {
      52    edge preheader = loop_preheader_edge (loop);
      53    return (preheader ? preheader->src : ENTRY_BLOCK_PTR_FOR_FN (cfun));
      54  }
      55  
      56  /* Analyze all the parameters of the chrec that were left under a
      57     symbolic form.  LOOP is the loop in which symbolic names have to
      58     be analyzed and instantiated.  */
      59  
      60  inline tree
      61  instantiate_parameters (class loop *loop, tree chrec)
      62  {
      63    return instantiate_scev (loop_preheader_edge (loop), loop, chrec);
      64  }
      65  
      66  /* Returns the loop of the polynomial chrec CHREC.  */
      67  
      68  inline class loop *
      69  get_chrec_loop (const_tree chrec)
      70  {
      71    return get_loop (cfun, CHREC_VARIABLE (chrec));
      72  }
      73  
      74  #endif  /* GCC_TREE_SCALAR_EVOLUTION_H  */