1 /* Support routines for Value Range Propagation (VRP).
2 Copyright (C) 2016-2017 Free Software Foundation, Inc.
4 This file is part of GCC.
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)
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.
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/>. */
20 /* Type of value ranges. See value_range_d In tree-vrp.c for a
21 description of these types. */
22 enum value_range_type
{ VR_UNDEFINED
, VR_RANGE
,
23 VR_ANTI_RANGE
, VR_VARYING
, VR_LAST
};
25 /* Range of values that can be associated with an SSA_NAME after VRP
27 struct GTY(()) value_range
29 /* Lattice value represented by this range. */
30 enum value_range_type type
;
32 /* Minimum and maximum values represented by this range. These
33 values should be interpreted as follows:
35 - If TYPE is VR_UNDEFINED or VR_VARYING then MIN and MAX must
38 - If TYPE == VR_RANGE then MIN holds the minimum value and
39 MAX holds the maximum value of the range [MIN, MAX].
41 - If TYPE == ANTI_RANGE the variable is known to NOT
42 take any values in the range [MIN, MAX]. */
46 /* Set of SSA names whose value ranges are equivalent to this one.
47 This set is only valid when TYPE is VR_RANGE or VR_ANTI_RANGE. */
51 extern void vrp_intersect_ranges (value_range
*vr0
, value_range
*vr1
);
52 extern void vrp_meet (value_range
*vr0
, const value_range
*vr1
);
53 extern void dump_value_range (FILE *, const value_range
*);
54 extern void extract_range_from_unary_expr (value_range
*vr
,