1/* Scalar evolution detector.
2 Copyright (C) 2003-2017 Free Software Foundation, Inc.
3 Contributed by Sebastian Pop <s.pop@laposte.net>
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 3, or (at your option) any later
10version.
11
12GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15for more details.
16
17You should have received a copy of the GNU General Public License
18along 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
24extern tree number_of_latch_executions (struct loop *);
25extern gcond *get_loop_exit_condition (const struct loop *);
26
27extern void scev_initialize (void);
28extern bool scev_initialized_p (void);
29extern void scev_reset (void);
30extern void scev_reset_htab (void);
31extern void scev_finalize (void);
32extern tree analyze_scalar_evolution (struct loop *, tree);
33extern tree instantiate_scev (edge, struct loop *, tree);
34extern tree resolve_mixers (struct loop *, tree, bool *);
35extern void gather_stats_on_scev_database (void);
36extern void final_value_replacement_loop (struct loop *);
37extern unsigned int scev_const_prop (void);
38extern bool expression_expensive_p (tree);
39extern bool simple_iv_with_niters (struct loop *, struct loop *, tree,
40 struct affine_iv *, tree *, bool);
41extern bool simple_iv (struct loop *, struct loop *, tree, struct affine_iv *,
42 bool);
43extern bool iv_can_overflow_p (struct loop *, tree, tree, tree);
44extern tree compute_overall_effect_of_inner_loop (struct loop *, tree);
45
46/* Returns the basic block preceding LOOP, or the CFG entry block when
47 the loop is function's body. */
48
49static inline basic_block
50block_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
60static inline tree
61instantiate_parameters (struct 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
68static inline struct loop *
69get_chrec_loop (const_tree chrec)
70{
71 return get_loop (cfun, CHREC_VARIABLE (chrec));
72}
73
74#endif /* GCC_TREE_SCALAR_EVOLUTION_H */
75