1 /* Misc range functions.
2 Copyright (C) 2017-2020 Free Software Foundation, Inc.
3 Contributed by Aldy Hernandez <aldyh@redhat.com>.
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 #include "config.h"
22 #include "system.h"
23 #include "coretypes.h"
24 #include "backend.h"
25 #include "tree.h"
26 #include "gimple.h"
27 #include "gimple-pretty-print.h"
28 #include "fold-const.h"
29 #include "ssa.h"
30 #include "range.h"
31
32 value_range
range_zero(tree type)33 range_zero (tree type)
34 {
35 return value_range (build_zero_cst (type), build_zero_cst (type));
36 }
37
38 value_range
range_nonzero(tree type)39 range_nonzero (tree type)
40 {
41 return value_range (build_zero_cst (type), build_zero_cst (type),
42 VR_ANTI_RANGE);
43 }
44
45 value_range
range_positives(tree type)46 range_positives (tree type)
47 {
48 unsigned prec = TYPE_PRECISION (type);
49 signop sign = TYPE_SIGN (type);
50 return value_range (type, wi::zero (prec), wi::max_value (prec, sign));
51 }
52
53 value_range
range_negatives(tree type)54 range_negatives (tree type)
55 {
56 unsigned prec = TYPE_PRECISION (type);
57 signop sign = TYPE_SIGN (type);
58 value_range r;
59 if (sign == UNSIGNED)
60 r.set_undefined ();
61 else
62 r = value_range (type, wi::min_value (prec, sign), wi::minus_one (prec));
63 return r;
64 }
65