1 /* Scalar evolution detector.
2 Copyright (C) 2003-2017 Free Software Foundation, Inc.
3 Contributed by Sebastian Pop <s.pop@laposte.net>
5 This file is part of GCC.
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
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
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/>. */
21 #ifndef GCC_TREE_SCALAR_EVOLUTION_H
22 #define GCC_TREE_SCALAR_EVOLUTION_H
24 extern tree
number_of_latch_executions (struct loop
*);
25 extern gcond
*get_loop_exit_condition (const struct loop
*);
27 extern void scev_initialize (void);
28 extern bool scev_initialized_p (void);
29 extern void scev_reset (void);
30 extern void scev_reset_htab (void);
31 extern void scev_finalize (void);
32 extern tree
analyze_scalar_evolution (struct loop
*, tree
);
33 extern tree
instantiate_scev (basic_block
, struct loop
*, tree
);
34 extern tree
resolve_mixers (struct loop
*, tree
, bool *);
35 extern void gather_stats_on_scev_database (void);
36 extern void final_value_replacement_loop (struct loop
*);
37 extern unsigned int scev_const_prop (void);
38 extern bool expression_expensive_p (tree
);
39 extern bool simple_iv_with_niters (struct loop
*, struct loop
*, tree
,
40 struct affine_iv
*, tree
*, bool);
41 extern bool simple_iv (struct loop
*, struct loop
*, tree
, struct affine_iv
*,
43 extern bool iv_can_overflow_p (struct loop
*, tree
, tree
, tree
);
44 extern tree
compute_overall_effect_of_inner_loop (struct loop
*, tree
);
46 /* Returns the basic block preceding LOOP, or the CFG entry block when
47 the loop is function's body. */
49 static inline basic_block
50 block_before_loop (loop_p loop
)
52 edge preheader
= loop_preheader_edge (loop
);
53 return (preheader
? preheader
->src
: ENTRY_BLOCK_PTR_FOR_FN (cfun
));
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. */
61 instantiate_parameters (struct loop
*loop
, tree chrec
)
63 return instantiate_scev (block_before_loop (loop
), loop
, chrec
);
66 /* Returns the loop of the polynomial chrec CHREC. */
68 static inline struct loop
*
69 get_chrec_loop (const_tree chrec
)
71 return get_loop (cfun
, CHREC_VARIABLE (chrec
));
74 #endif /* GCC_TREE_SCALAR_EVOLUTION_H */