GCC Middle and Back End API Reference
tree-scalar-evolution.h
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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 unsigned int scev_const_prop (void);
38 extern bool expression_expensive_p (tree);
39 extern bool simple_iv (struct loop *, struct loop *, tree, affine_iv *, bool);
40 extern tree compute_overall_effect_of_inner_loop (struct loop *, tree);
41 
42 /* Returns the basic block preceding LOOP or ENTRY_BLOCK_PTR when the
43  loop is function's body. */
44 
45 static inline basic_block
46 block_before_loop (loop_p loop)
47 {
48  edge preheader = loop_preheader_edge (loop);
49  return (preheader ? preheader->src : ENTRY_BLOCK_PTR);
50 }
51 
52 /* Analyze all the parameters of the chrec that were left under a
53  symbolic form. LOOP is the loop in which symbolic names have to
54  be analyzed and instantiated. */
55 
56 static inline tree
57 instantiate_parameters (struct loop *loop, tree chrec)
58 {
59  return instantiate_scev (block_before_loop (loop), loop, chrec);
60 }
61 
62 /* Returns the loop of the polynomial chrec CHREC. */
63 
64 static inline struct loop *
65 get_chrec_loop (const_tree chrec)
66 {
67  return get_loop (cfun, CHREC_VARIABLE (chrec));
68 }
69 
70 #endif /* GCC_TREE_SCALAR_EVOLUTION_H */