1/* Misc range functions.
2 Copyright (C) 2017-2023 Free Software Foundation, Inc.
3 Contributed by Aldy Hernandez <aldyh@redhat.com>.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 3, or (at your option) any later
10version.
11
12GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16
17You should have received a copy of the GNU General Public License
18along 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
32value_range
33range_zero (tree type)
34{
35 wide_int zero = wi::zero (TYPE_PRECISION (type));
36 return value_range (type, zero, zero);
37}
38
39value_range
40range_nonzero (tree type)
41{
42 wide_int zero = wi::zero (TYPE_PRECISION (type));
43 return value_range (type, zero, zero, VR_ANTI_RANGE);
44}
45
46value_range
47range_positives (tree type)
48{
49 unsigned prec = TYPE_PRECISION (type);
50 signop sign = TYPE_SIGN (type);
51 return value_range (type, wi::zero (precision: prec), wi::max_value (prec, sign));
52}
53
54value_range
55range_negatives (tree type)
56{
57 unsigned prec = TYPE_PRECISION (type);
58 signop sign = TYPE_SIGN (type);
59 value_range r;
60 if (sign == UNSIGNED)
61 r.set_undefined ();
62 else
63 r = value_range (type, wi::min_value (prec, sign), wi::minus_one (precision: prec));
64 return r;
65}
66

source code of gcc/range.cc