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/* Scalar evolution detector.

   Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.

   Contributed by Sebastian Pop <s.pop@laposte.net>

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 2, 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 COPYING.  If not, write to the Free

Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301, USA.  */

#ifndef GCC_TREE_SCALAR_EVOLUTION_H

#define GCC_TREE_SCALAR_EVOLUTION_H

extern tree number_of_iterations_in_loop (struct loop *);

extern tree get_loop_exit_condition (struct loop *);

extern void scev_initialize (struct loops *loops);

extern void scev_reset (void);

extern void scev_finalize (void);

extern tree analyze_scalar_evolution (struct loop *, tree);

extern tree instantiate_parameters (struct loop *, tree);

extern void gather_stats_on_scev_database (void);

extern void scev_analysis (void);

void scev_const_prop (void);

/* Affine iv.  */

typedef struct

{

  /* Iv = BASE + STEP * i.  */

  tree base, step;

  /* True if this iv does not overflow.  */

  bool no_overflow;

} affine_iv;

extern bool simple_iv (struct loop *, tree, tree, affine_iv *, bool);

#endif  /* GCC_TREE_SCALAR_EVOLUTION_H  */