[RS6000] PR79144, cmpstrnsi optimization breaks glibc
[official-gcc.git] / gcc / tree-scalar-evolution.h
blobc3980d0fbb2bf46382d90587a15f5dad7de0f8a4
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
10 version.
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.
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 *,
42 bool);
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. */
60 static inline tree
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 */