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/* Scalar evolution detector.
Copyright (C) 2003-2017 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 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_TREE_SCALAR_EVOLUTION_H
#define GCC_TREE_SCALAR_EVOLUTION_H
extern tree number_of_latch_executions (struct loop *);
extern gcond *get_loop_exit_condition (const struct loop *);
extern void scev_initialize (void);
extern bool scev_initialized_p (void);
extern void scev_reset (void);
extern void scev_reset_htab (void);
extern void scev_finalize (void);
extern tree analyze_scalar_evolution (struct loop *, tree);
extern tree instantiate_scev (basic_block, struct loop *, tree);
extern tree resolve_mixers (struct loop *, tree, bool *);
extern void gather_stats_on_scev_database (void);
extern void final_value_replacement_loop (struct loop *);
extern unsigned int scev_const_prop (void);
extern bool expression_expensive_p (tree);
extern bool simple_iv_with_niters (struct loop *, struct loop *, tree,
struct affine_iv *, tree *, bool);
extern bool simple_iv (struct loop *, struct loop *, tree, struct affine_iv *,
bool);
extern bool iv_can_overflow_p (struct loop *, tree, tree, tree);
extern tree compute_overall_effect_of_inner_loop (struct loop *, tree);
/* Returns the basic block preceding LOOP, or the CFG entry block when
the loop is function's body. */
static inline basic_block
block_before_loop (loop_p loop)
{
edge preheader = loop_preheader_edge (loop);
return (preheader ? preheader->src : ENTRY_BLOCK_PTR_FOR_FN (cfun));
}
/* Analyze all the parameters of the chrec that were left under a
symbolic form. LOOP is the loop in which symbolic names have to
be analyzed and instantiated. */
static inline tree
instantiate_parameters (struct loop *loop, tree chrec)
{
return instantiate_scev (block_before_loop (loop), loop, chrec);
}
/* Returns the loop of the polynomial chrec CHREC. */
static inline struct loop *
get_chrec_loop (const_tree chrec)
{
return get_loop (cfun, CHREC_VARIABLE (chrec));
}
#endif /* GCC_TREE_SCALAR_EVOLUTION_H */
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