Mercurial > hg > CbC > CbC_gcc
comparison gcc/range.cc @ 145:1830386684a0
gcc-9.2.0
author | anatofuz |
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date | Thu, 13 Feb 2020 11:34:05 +0900 |
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131:84e7813d76e9 | 145:1830386684a0 |
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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 | |
33 range_zero (tree type) | |
34 { | |
35 return value_range (build_zero_cst (type), build_zero_cst (type)); | |
36 } | |
37 | |
38 value_range | |
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 | |
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 | |
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 } |