gcc/range.h

   1 /* Header file for misc range functions. -*- C++ -*-
   2    Copyright (C) 2017-2023 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 #ifndef GCC_RANGE_H
  22 #define GCC_RANGE_H
  23
  24 value_range range_zero (tree type);
  25 value_range range_nonzero (tree type);
  26 value_range range_positives (tree type);
  27 value_range range_negatives (tree type);
  28
  29 // Return an irange instance that is a boolean TRUE.
  30
  31 static inline int_range<1>
  32 range_true (tree type)
  33 {
  34   unsigned prec = TYPE_PRECISION (type);
  35   return int_range<2> (type, wi::one (prec), wi::one (prec));
  36 }
  37
  38 // Return an irange instance that is a boolean FALSE.
  39
  40 static inline int_range<1>
  41 range_false (tree type)
  42 {
  43   unsigned prec = TYPE_PRECISION (type);
  44   return int_range<2> (type, wi::zero (prec), wi::zero (prec));
  45 }
  46
  47 // Return an irange that covers both true and false.
  48
  49 static inline int_range<1>
  50 range_true_and_false (tree type)
  51 {
  52   unsigned prec = TYPE_PRECISION (type);
  53   if (prec == 1)
  54     return int_range<2> (type);
  55   return int_range<2> (type, wi::zero (prec), wi::one (prec));
  56 }
  57
  58 #endif // GCC_RANGE_H