1/* Scalar evolution detector.
2 Copyright (C) 2003-2023 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 (class loop *);
25extern gcond *get_loop_exit_condition (const class loop *);
26extern gcond *get_loop_exit_condition (const_edge);
27
28extern void scev_initialize (void);
29extern bool scev_initialized_p (void);
30extern void scev_reset (void);
31extern void scev_reset_htab (void);
32extern void scev_finalize (void);
33extern tree analyze_scalar_evolution (class loop *, tree);
34extern tree instantiate_scev (edge, class loop *, tree);
35extern tree resolve_mixers (class loop *, tree, bool *);
36extern void gather_stats_on_scev_database (void);
37extern bool final_value_replacement_loop (class loop *);
38extern unsigned int scev_const_prop (void);
39extern bool expression_expensive_p (tree, bool *);
40extern bool simple_iv_with_niters (class loop *, class loop *, tree,
41 struct affine_iv *, tree *, bool);
42extern bool simple_iv (class loop *, class loop *, tree, struct affine_iv *,
43 bool);
44extern bool iv_can_overflow_p (class loop *, tree, tree, tree);
45extern tree compute_overall_effect_of_inner_loop (class loop *, tree);
46
47/* Returns the basic block preceding LOOP, or the CFG entry block when
48 the loop is function's body. */
49
50inline basic_block
51block_before_loop (loop_p loop)
52{
53 edge preheader = loop_preheader_edge (loop);
54 return (preheader ? preheader->src : ENTRY_BLOCK_PTR_FOR_FN (cfun));
55}
56
57/* Analyze all the parameters of the chrec that were left under a
58 symbolic form. LOOP is the loop in which symbolic names have to
59 be analyzed and instantiated. */
60
61inline tree
62instantiate_parameters (class loop *loop, tree chrec)
63{
64 return instantiate_scev (loop_preheader_edge (loop), loop, chrec);
65}
66
67/* Returns the loop of the polynomial chrec CHREC. */
68
69inline class loop *
70get_chrec_loop (const_tree chrec)
71{
72 return get_loop (cfun, CHREC_VARIABLE (chrec));
73}
74
75#endif /* GCC_TREE_SCALAR_EVOLUTION_H */
76

source code of gcc/tree-scalar-evolution.h