gcc/tree-scalar-evolution.h

   1 /* Scalar evolution detector.
   2    Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010
   3    Free Software Foundation, Inc.
   4    Contributed by Sebastian Pop <s.pop@laposte.net>
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_TREE_SCALAR_EVOLUTION_H
  23 #define GCC_TREE_SCALAR_EVOLUTION_H
  24
  25 extern tree number_of_latch_executions (struct loop *);
  26 extern tree number_of_exit_cond_executions (struct loop *);
  27 extern gimple get_loop_exit_condition (const struct loop *);
  28
  29 extern void scev_initialize (void);
  30 extern void scev_reset (void);
  31 extern void scev_reset_htab (void);
  32 extern void scev_finalize (void);
  33 extern tree analyze_scalar_evolution (struct loop *, tree);
  34 extern tree instantiate_scev (basic_block, struct loop *, tree);
  35 extern tree resolve_mixers (struct loop *, tree);
  36 extern void gather_stats_on_scev_database (void);
  37 extern void scev_analysis (void);
  38 extern unsigned int scev_const_prop (void);
  39 extern bool expression_expensive_p (tree);
  40 extern bool simple_iv (struct loop *, struct loop *, tree, affine_iv *, bool);
  41 extern tree compute_overall_effect_of_inner_loop (struct loop *, tree);
  42
  43 /* Returns the basic block preceding LOOP or ENTRY_BLOCK_PTR when the
  44    loop is function's body.  */
  45
  46 static inline basic_block
  47 block_before_loop (loop_p loop)
  48 {
  49   edge preheader = loop_preheader_edge (loop);
  50   return (preheader ? preheader->src : ENTRY_BLOCK_PTR);
  51 }
  52
  53 /* Analyze all the parameters of the chrec that were left under a
  54    symbolic form.  LOOP is the loop in which symbolic names have to
  55    be analyzed and instantiated.  */
  56
  57 static inline tree
  58 instantiate_parameters (struct loop *loop, tree chrec)
  59 {
  60   return instantiate_scev (block_before_loop (loop), loop, chrec);
  61 }
  62
  63 /* Returns the loop of the polynomial chrec CHREC.  */
  64
  65 static inline struct loop *
  66 get_chrec_loop (const_tree chrec)
  67 {
  68   return get_loop (CHREC_VARIABLE (chrec));
  69 }
  70
  71 #endif  /* GCC_TREE_SCALAR_EVOLUTION_H  */