Mercurial > octave
annotate libinterp/operators/op-mi.cc @ 31706:597f3ee61a48 stable
update Octave Project Developers copyright for the new year
author | John W. Eaton <jwe@octave.org> |
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date | Fri, 06 Jan 2023 13:11:27 -0500 |
parents | e88a07dec498 |
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1 //////////////////////////////////////////////////////////////////////// |
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2 // |
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3 // Copyright (C) 2020-2023 The Octave Project Developers |
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4 // |
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5 // See the file COPYRIGHT.md in the top-level directory of this |
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6 // distribution or <https://octave.org/copyright/>. |
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7 // |
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8 // This file is part of Octave. |
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9 // |
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10 // Octave is free software: you can redistribute it and/or modify it |
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11 // under the terms of the GNU General Public License as published by |
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12 // the Free Software Foundation, either version 3 of the License, or |
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13 // (at your option) any later version. |
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14 // |
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15 // Octave is distributed in the hope that it will be useful, but |
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 // GNU General Public License for more details. |
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19 // |
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20 // You should have received a copy of the GNU General Public License |
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21 // along with Octave; see the file COPYING. If not, see |
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22 // <https://www.gnu.org/licenses/>. |
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23 // |
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24 //////////////////////////////////////////////////////////////////////// |
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25 |
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26 #if defined (HAVE_CONFIG_H) |
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27 # include "config.h" |
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28 #endif |
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29 |
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30 #include <iostream> |
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31 |
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32 #include "errwarn.h" |
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33 #include "ops.h" |
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34 #include "ov-magic-int.h" |
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35 #include "ov-typeinfo.h" |
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36 #include "ov.h" |
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37 |
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38 OCTAVE_BEGIN_NAMESPACE(octave) |
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39 |
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40 // Magic integer unary ops. Only + and - are allowed so that |
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41 // expressions like |
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42 // |
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43 // int64 (-9007199254740994) |
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44 // |
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45 // produce proper int64 constants. |
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46 |
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47 static octave_value |
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48 oct_unop_unsigned_uplus (const octave_base_value& a) |
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49 { |
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50 const octave_magic_uint& v = dynamic_cast<const octave_magic_uint&> (a); |
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51 // no-op. |
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52 // FIXME: but can we do this just by incrementing the reference count? |
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53 return octave_value (v.clone ()); |
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54 } |
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55 |
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56 static octave_value |
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57 oct_unop_unsigned_uminus (const octave_base_value& a) |
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58 { |
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59 const octave_magic_uint& v = dynamic_cast<const octave_magic_uint&> (a); |
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60 |
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61 // We are storing a uint64 value, so some fakery is needed here. |
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62 // Is there a better way? |
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63 |
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64 // FIXME: Maybe there should also be octave_magic_int::as_TYPE_value |
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65 // functions? |
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66 octave_uint64 val (v.scalar_ref ()); |
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67 |
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68 uint64_t ival = val.value (); |
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69 |
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70 static const uint64_t max_val |
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71 = static_cast<uint64_t> (std::numeric_limits<int64_t>::max ()); |
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72 |
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73 static const uint64_t max_val_p1 = max_val + 1; |
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74 |
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75 if (ival <= max_val) |
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76 { |
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77 int64_t signed_ival = ival; |
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78 return octave_value (new octave_magic_int (-signed_ival)); |
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79 } |
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80 |
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81 if (ival == max_val_p1) |
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82 { |
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83 // Correctly capture intmin. For example, negating uint8(128) |
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84 // should return int8(-128) but converting directly to int8 and |
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85 // negating will not return the correct result. |
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86 |
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87 static const int64_t min_signed_ival |
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88 = std::numeric_limits<int64_t>::min (); |
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89 |
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90 return octave_value (new octave_magic_int (min_signed_ival)); |
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91 } |
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92 |
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93 return octave_value (-static_cast<double> (ival)); |
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94 } |
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95 |
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96 static octave_value |
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97 oct_unop_signed_uplus (const octave_base_value& a) |
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98 { |
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99 const octave_magic_int& v = dynamic_cast<const octave_magic_int&> (a); |
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100 // no-op. |
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101 // FIXME: but can we do this just by incrementing the reference count? |
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102 return octave_value (v.clone ()); |
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103 } |
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104 |
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105 static octave_value |
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106 oct_unop_signed_uminus (const octave_base_value& a) |
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107 { |
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108 const octave_magic_int& v = dynamic_cast<const octave_magic_int&> (a); |
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109 |
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110 // FIXME: Maybe there should also be octave_magic_int::as_TYPE_value |
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111 // functions? |
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112 octave_int64 val (v.scalar_ref ()); |
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113 |
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114 return octave_value (new octave_magic_int (-val)); |
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115 } |
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116 |
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117 void |
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118 install_mi_ops (octave::type_info& ti) |
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119 { |
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120 INSTALL_UNOP_TI (ti, op_uplus, octave_magic_uint, unsigned_uplus); |
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121 INSTALL_UNOP_TI (ti, op_uminus, octave_magic_uint, unsigned_uminus); |
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122 |
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123 INSTALL_UNOP_TI (ti, op_uplus, octave_magic_int, signed_uplus); |
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124 INSTALL_UNOP_TI (ti, op_uminus, octave_magic_int, signed_uminus); |
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125 } |
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126 |
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127 OCTAVE_END_NAMESPACE(octave) |