|
111
|
1 /* Support routines for Value Range Propagation (VRP).
|
|
|
2 Copyright (C) 2016-2017 Free Software Foundation, Inc.
|
|
|
3
|
|
|
4 This file is part of GCC.
|
|
|
5
|
|
|
6 GCC is free software; you can redistribute it and/or modify
|
|
|
7 it under the terms of the GNU General Public License as published by
|
|
|
8 the Free Software Foundation; either version 3, or (at your option)
|
|
|
9 any later version.
|
|
|
10
|
|
|
11 GCC is distributed in the hope that it will be useful,
|
|
|
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
14 GNU General Public License for more details.
|
|
|
15
|
|
|
16 You should have received a copy of the GNU General Public License
|
|
|
17 along with GCC; see the file COPYING3. If not see
|
|
|
18 <http://www.gnu.org/licenses/>. */
|
|
|
19
|
|
|
20 #ifndef GCC_TREE_VRP_H
|
|
|
21 #define GCC_TREE_VRP_H
|
|
|
22
|
|
|
23 /* Type of value ranges. See value_range_d In tree-vrp.c for a
|
|
|
24 description of these types. */
|
|
|
25 enum value_range_type { VR_UNDEFINED, VR_RANGE,
|
|
|
26 VR_ANTI_RANGE, VR_VARYING, VR_LAST };
|
|
|
27
|
|
|
28 /* Range of values that can be associated with an SSA_NAME after VRP
|
|
|
29 has executed. */
|
|
|
30 struct GTY((for_user)) value_range
|
|
|
31 {
|
|
|
32 /* Lattice value represented by this range. */
|
|
|
33 enum value_range_type type;
|
|
|
34
|
|
|
35 /* Minimum and maximum values represented by this range. These
|
|
|
36 values should be interpreted as follows:
|
|
|
37
|
|
|
38 - If TYPE is VR_UNDEFINED or VR_VARYING then MIN and MAX must
|
|
|
39 be NULL.
|
|
|
40
|
|
|
41 - If TYPE == VR_RANGE then MIN holds the minimum value and
|
|
|
42 MAX holds the maximum value of the range [MIN, MAX].
|
|
|
43
|
|
|
44 - If TYPE == ANTI_RANGE the variable is known to NOT
|
|
|
45 take any values in the range [MIN, MAX]. */
|
|
|
46 tree min;
|
|
|
47 tree max;
|
|
|
48
|
|
|
49 /* Set of SSA names whose value ranges are equivalent to this one.
|
|
|
50 This set is only valid when TYPE is VR_RANGE or VR_ANTI_RANGE. */
|
|
|
51 bitmap equiv;
|
|
|
52 };
|
|
|
53
|
|
|
54 extern void vrp_intersect_ranges (value_range *vr0, value_range *vr1);
|
|
|
55 extern void vrp_meet (value_range *vr0, const value_range *vr1);
|
|
|
56 extern void dump_value_range (FILE *, const value_range *);
|
|
|
57 extern void extract_range_from_unary_expr (value_range *vr,
|
|
|
58 enum tree_code code,
|
|
|
59 tree type,
|
|
|
60 value_range *vr0_,
|
|
|
61 tree op0_type);
|
|
|
62
|
|
|
63 #endif /* GCC_TREE_VRP_H */
|
