1 /* Scalar evolution detector.
2 Copyright (C) 2003-2013 Free Software Foundation, Inc.
3 Contributed by Sebastian Pop <s.pop@laposte.net>
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
10 version.
11
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16
17 You should have received a copy of the GNU General Public License
18 along 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
24 extern tree number_of_latch_executions (struct loop *);
25 extern tree number_of_exit_cond_executions (struct loop *);
26 extern gimple get_loop_exit_condition (const struct loop *);
27
28 extern void scev_initialize (void);
29 extern bool scev_initialized_p (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
block_before_loop(loop_p loop)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
instantiate_parameters(struct loop * loop,tree chrec)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 *
get_chrec_loop(const_tree chrec)66 get_chrec_loop (const_tree chrec)
67 {
68 return get_loop (CHREC_VARIABLE (chrec));
69 }
70
71 #endif /* GCC_TREE_SCALAR_EVOLUTION_H */
72