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145
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1 /* Misc range functions.
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2 Copyright (C) 2017-2020 Free Software Foundation, Inc.
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3 Contributed by Aldy Hernandez <aldyh@redhat.com>.
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under
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8 the terms of the GNU General Public License as published by the Free
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 #include "config.h"
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22 #include "system.h"
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23 #include "coretypes.h"
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24 #include "backend.h"
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25 #include "tree.h"
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26 #include "gimple.h"
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27 #include "gimple-pretty-print.h"
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28 #include "fold-const.h"
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29 #include "ssa.h"
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30 #include "range.h"
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31
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32 value_range
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33 range_zero (tree type)
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34 {
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35 return value_range (build_zero_cst (type), build_zero_cst (type));
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36 }
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37
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38 value_range
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39 range_nonzero (tree type)
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40 {
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41 return value_range (build_zero_cst (type), build_zero_cst (type),
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42 VR_ANTI_RANGE);
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43 }
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44
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45 value_range
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46 range_positives (tree type)
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47 {
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48 unsigned prec = TYPE_PRECISION (type);
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49 signop sign = TYPE_SIGN (type);
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50 return value_range (type, wi::zero (prec), wi::max_value (prec, sign));
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51 }
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52
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53 value_range
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54 range_negatives (tree type)
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55 {
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56 unsigned prec = TYPE_PRECISION (type);
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57 signop sign = TYPE_SIGN (type);
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58 value_range r;
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59 if (sign == UNSIGNED)
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60 r.set_undefined ();
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61 else
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62 r = value_range (type, wi::min_value (prec, sign), wi::minus_one (prec));
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63 return r;
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64 }
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