Mercurial > octave
annotate libinterp/corefcn/bitfcns.cc @ 21751:b571fc85953f
maint: Use two spaces after period to indicate sentence break.
author | Rik <rik@octave.org> |
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date | Thu, 19 May 2016 18:48:52 -0700 |
parents | aba2e6293dd8 |
children | 112b20240c87 |
rev | line source |
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4908 | 1 /* |
2 | |
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3 Copyright (C) 2004-2015 John W. Eaton |
4908 | 4 |
5 This file is part of Octave. | |
6 | |
7 Octave is free software; you can redistribute it and/or modify it | |
8 under the terms of the GNU General Public License as published by the | |
7016 | 9 Free Software Foundation; either version 3 of the License, or (at your |
10 option) any later version. | |
4908 | 11 |
12 Octave is distributed in the hope that it will be useful, but WITHOUT | |
13 ANY 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 | |
7016 | 18 along with Octave; see the file COPYING. If not, see |
19 <http://www.gnu.org/licenses/>. | |
4908 | 20 |
21 */ | |
22 | |
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23 #if defined (HAVE_CONFIG_H) |
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24 # include "config.h" |
4908 | 25 #endif |
26 | |
17396 | 27 #include <limits> |
28 | |
4908 | 29 #include "str-vec.h" |
30 #include "quit.h" | |
31 | |
32 #include "defun.h" | |
33 #include "error.h" | |
34 #include "ov.h" | |
35 #include "ov-uint64.h" | |
4915 | 36 #include "ov-uint32.h" |
37 #include "ov-uint16.h" | |
38 #include "ov-uint8.h" | |
39 #include "ov-int64.h" | |
40 #include "ov-int32.h" | |
41 #include "ov-int16.h" | |
42 #include "ov-int8.h" | |
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43 #include "ov-float.h" |
4915 | 44 #include "ov-scalar.h" |
45 #include "ov-re-mat.h" | |
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46 #include "ov-bool.h" |
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48 #include <functional> |
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49 |
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50 #if ! defined (HAVE_CXX_BITWISE_OP_TEMPLATES) |
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51 namespace std |
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52 { |
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53 template <typename T> |
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54 struct bit_and |
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55 { |
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56 public: |
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57 T operator() (const T & op1, const T & op2) const { return (op1 & op2); } |
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58 }; |
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59 |
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60 template <typename T> |
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61 struct bit_or |
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62 { |
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63 public: |
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64 T operator() (const T & op1, const T & op2) const { return (op1 | op2); } |
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65 }; |
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66 |
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67 template <typename T> |
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68 struct bit_xor |
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69 { |
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70 public: |
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71 T operator() (const T & op1, const T & op2) const { return (op1 ^ op2); } |
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72 }; |
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73 } |
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74 #endif |
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75 |
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76 template <typename OP, typename T> |
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77 octave_value |
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78 bitopxx (const OP& op, const std::string& fname, |
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79 const Array<T>& x, const Array<T>& y) |
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80 { |
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81 int nelx = x.numel (); |
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82 int nely = y.numel (); |
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83 |
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84 bool is_scalar_op = (nelx == 1 || nely == 1); |
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85 |
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86 dim_vector dvx = x.dims (); |
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87 dim_vector dvy = y.dims (); |
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88 |
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89 bool is_array_op = (dvx == dvy); |
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90 |
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91 if (! is_array_op && ! is_scalar_op) |
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92 error ("%s: size of X and Y must match, or one operand must be a scalar", |
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93 fname.c_str ()); |
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94 |
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95 Array<T> result; |
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96 |
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97 if (nelx != 1) |
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98 result.resize (dvx); |
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99 else |
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100 result.resize (dvy); |
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101 |
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102 for (int i = 0; i < nelx; i++) |
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103 if (is_scalar_op) |
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104 for (int k = 0; k < nely; k++) |
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105 result(i+k) = op (x(i), y(k)); |
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106 else |
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107 result(i) = op (x(i), y(i)); |
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108 |
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109 return result; |
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110 } |
4908 | 111 |
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112 // Trampoline function, instantiates the proper template above, with |
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113 // reflective information hardwired. We can't hardwire this information |
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114 // in Fbitxxx DEFUNs below, because at that moment, we still don't have |
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115 // information about which integer types we need to instantiate. |
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116 template <typename T> |
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117 octave_value |
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118 bitopx (const std::string& fname, const Array<T>& x, const Array<T>& y) |
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119 { |
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120 if (fname == "bitand") |
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121 return bitopxx (std::bit_and<T>(), fname, x, y); |
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122 if (fname == "bitor") |
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123 return bitopxx (std::bit_or<T>(), fname, x, y); |
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124 |
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125 //else (fname == "bitxor") |
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126 return bitopxx (std::bit_xor<T>(), fname, x, y); |
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127 } |
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128 |
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129 static inline int |
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130 bitop_arg_is_int (const octave_value& arg) |
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131 { |
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132 return (arg.class_name () != octave_scalar::static_class_name () |
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133 && arg.class_name () != octave_float_scalar::static_class_name () |
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134 && arg.class_name () != octave_bool::static_class_name ()); |
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135 } |
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136 |
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137 static inline int |
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138 bitop_arg_is_bool (const octave_value& arg) |
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139 { |
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140 return arg.class_name () == octave_bool::static_class_name (); |
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141 } |
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142 |
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143 static inline int |
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144 bitop_arg_is_float (const octave_value& arg) |
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145 { |
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146 return arg.class_name () == octave_float_scalar::static_class_name (); |
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147 } |
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148 |
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149 octave_value |
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150 bitop (const std::string& fname, const octave_value_list& args) |
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151 { |
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152 if (args.length () != 2) |
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153 print_usage (); |
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154 |
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155 octave_value retval; |
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156 |
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157 if (args(0).class_name () == octave_scalar::static_class_name () |
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158 || args(0).class_name () == octave_float_scalar::static_class_name () |
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159 || args(0).class_name () == octave_bool::static_class_name () |
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160 || args(1).class_name () == octave_scalar::static_class_name () |
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161 || args(1).class_name () == octave_float_scalar::static_class_name () |
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162 || args(1).class_name () == octave_bool::static_class_name ()) |
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163 { |
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164 bool arg0_is_int = bitop_arg_is_int (args(0)); |
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165 bool arg1_is_int = bitop_arg_is_int (args(1)); |
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166 |
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167 bool arg0_is_bool = bitop_arg_is_bool (args(0)); |
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168 bool arg1_is_bool = bitop_arg_is_bool (args(1)); |
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169 |
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170 bool arg0_is_float = bitop_arg_is_float (args(0)); |
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171 bool arg1_is_float = bitop_arg_is_float (args(1)); |
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172 |
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173 if (! (arg0_is_int || arg1_is_int)) |
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174 { |
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175 if (arg0_is_bool && arg1_is_bool) |
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176 { |
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177 boolNDArray x (args(0).bool_array_value ()); |
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178 boolNDArray y (args(1).bool_array_value ()); |
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179 |
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180 retval = bitopx (fname, x, y).bool_array_value (); |
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181 } |
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182 else if (arg0_is_float && arg1_is_float) |
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183 { |
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184 uint64NDArray x (args(0).float_array_value ()); |
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185 uint64NDArray y (args(1).float_array_value ()); |
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186 |
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187 retval = bitopx (fname, x, y).float_array_value (); |
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188 } |
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189 else if (! (arg0_is_float || arg1_is_float)) |
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190 { |
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191 uint64NDArray x (args(0).array_value ()); |
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192 uint64NDArray y (args(1).array_value ()); |
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193 |
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194 retval = bitopx (fname, x, y).array_value (); |
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195 } |
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196 else |
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197 { |
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198 int p = (arg0_is_float ? 1 : 0); |
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199 int q = (arg0_is_float ? 0 : 1); |
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200 |
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201 uint64NDArray x (args(p).array_value ()); |
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202 uint64NDArray y (args(q).float_array_value ()); |
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203 |
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204 retval = bitopx (fname, x, y).float_array_value (); |
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205 } |
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206 } |
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207 else |
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208 { |
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209 int p = (arg0_is_int ? 1 : 0); |
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210 int q = (arg0_is_int ? 0 : 1); |
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211 |
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212 NDArray dx = args(p).array_value (); |
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213 |
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214 if (args(q).type_id () == octave_uint64_matrix::static_type_id () |
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215 || args(q).type_id () == octave_uint64_scalar::static_type_id ()) |
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216 { |
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217 uint64NDArray x (dx); |
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218 uint64NDArray y = args(q).uint64_array_value (); |
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219 |
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220 retval = bitopx (fname, x, y); |
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221 } |
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222 else if (args(q).type_id () == octave_uint32_matrix::static_type_id () |
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223 || args(q).type_id () == octave_uint32_scalar::static_type_id ()) |
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224 { |
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225 uint32NDArray x (dx); |
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226 uint32NDArray y = args(q).uint32_array_value (); |
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227 |
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228 retval = bitopx (fname, x, y); |
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229 } |
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230 else if (args(q).type_id () == octave_uint16_matrix::static_type_id () |
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231 || args(q).type_id () == octave_uint16_scalar::static_type_id ()) |
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232 { |
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233 uint16NDArray x (dx); |
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234 uint16NDArray y = args(q).uint16_array_value (); |
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235 |
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236 retval = bitopx (fname, x, y); |
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237 } |
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238 else if (args(q).type_id () == octave_uint8_matrix::static_type_id () |
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239 || args(q).type_id () == octave_uint8_scalar::static_type_id ()) |
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240 { |
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241 uint8NDArray x (dx); |
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242 uint8NDArray y = args(q).uint8_array_value (); |
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243 |
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244 retval = bitopx (fname, x, y); |
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245 } |
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246 else if (args(q).type_id () == octave_int64_matrix::static_type_id () |
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247 || args(q).type_id () == octave_int64_scalar::static_type_id ()) |
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248 { |
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249 int64NDArray x (dx); |
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250 int64NDArray y = args(q).int64_array_value (); |
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251 |
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252 retval = bitopx (fname, x, y); |
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253 } |
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254 else if (args(q).type_id () == octave_int32_matrix::static_type_id () |
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255 || args(q).type_id () == octave_int32_scalar::static_type_id ()) |
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256 { |
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257 int32NDArray x (dx); |
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258 int32NDArray y = args(q).int32_array_value (); |
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259 |
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260 retval = bitopx (fname, x, y); |
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261 } |
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262 else if (args(q).type_id () == octave_int16_matrix::static_type_id () |
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263 || args(q).type_id () == octave_int16_scalar::static_type_id ()) |
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264 { |
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265 int16NDArray x (dx); |
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266 int16NDArray y = args(q).int16_array_value (); |
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267 |
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268 retval = bitopx (fname, x, y); |
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269 } |
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270 else if (args(q).type_id () == octave_int8_matrix::static_type_id () |
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271 || args(q).type_id () == octave_int8_scalar::static_type_id ()) |
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272 { |
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273 int8NDArray x (dx); |
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274 int8NDArray y = args(q).int8_array_value (); |
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275 |
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276 retval = bitopx (fname, x, y); |
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277 } |
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278 else |
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279 error ("%s: invalid operand type", fname.c_str ()); |
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280 } |
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281 } |
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282 else if (args(0).class_name () == args(1).class_name ()) |
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283 { |
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284 if (args(0).type_id () == octave_uint64_matrix::static_type_id () |
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285 || args(0).type_id () == octave_uint64_scalar::static_type_id ()) |
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286 { |
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287 uint64NDArray x = args(0).uint64_array_value (); |
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288 uint64NDArray y = args(1).uint64_array_value (); |
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289 |
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290 retval = bitopx (fname, x, y); |
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291 } |
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292 else if (args(0).type_id () == octave_uint32_matrix::static_type_id () |
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293 || args(0).type_id () == octave_uint32_scalar::static_type_id ()) |
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294 { |
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295 uint32NDArray x = args(0).uint32_array_value (); |
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296 uint32NDArray y = args(1).uint32_array_value (); |
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297 |
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298 retval = bitopx (fname, x, y); |
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299 } |
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300 else if (args(0).type_id () == octave_uint16_matrix::static_type_id () |
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301 || args(0).type_id () == octave_uint16_scalar::static_type_id ()) |
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302 { |
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303 uint16NDArray x = args(0).uint16_array_value (); |
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304 uint16NDArray y = args(1).uint16_array_value (); |
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305 |
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306 retval = bitopx (fname, x, y); |
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307 } |
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308 else if (args(0).type_id () == octave_uint8_matrix::static_type_id () |
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309 || args(0).type_id () == octave_uint8_scalar::static_type_id ()) |
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310 { |
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311 uint8NDArray x = args(0).uint8_array_value (); |
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312 uint8NDArray y = args(1).uint8_array_value (); |
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313 |
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314 retval = bitopx (fname, x, y); |
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315 } |
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316 else if (args(0).type_id () == octave_int64_matrix::static_type_id () |
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317 || args(0).type_id () == octave_int64_scalar::static_type_id ()) |
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318 { |
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319 int64NDArray x = args(0).int64_array_value (); |
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320 int64NDArray y = args(1).int64_array_value (); |
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321 |
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322 retval = bitopx (fname, x, y); |
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323 } |
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324 else if (args(0).type_id () == octave_int32_matrix::static_type_id () |
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325 || args(0).type_id () == octave_int32_scalar::static_type_id ()) |
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326 { |
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327 int32NDArray x = args(0).int32_array_value (); |
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328 int32NDArray y = args(1).int32_array_value (); |
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329 |
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330 retval = bitopx (fname, x, y); |
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331 } |
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332 else if (args(0).type_id () == octave_int16_matrix::static_type_id () |
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333 || args(0).type_id () == octave_int16_scalar::static_type_id ()) |
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334 { |
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335 int16NDArray x = args(0).int16_array_value (); |
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336 int16NDArray y = args(1).int16_array_value (); |
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337 |
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338 retval = bitopx (fname, x, y); |
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339 } |
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340 else if (args(0).type_id () == octave_int8_matrix::static_type_id () |
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341 || args(0).type_id () == octave_int8_scalar::static_type_id ()) |
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342 { |
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343 int8NDArray x = args(0).int8_array_value (); |
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344 int8NDArray y = args(1).int8_array_value (); |
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345 |
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346 retval = bitopx (fname, x, y); |
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347 } |
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348 else |
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349 error ("%s: invalid operand type", fname.c_str ()); |
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350 } |
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351 else |
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352 error ("%s: must have matching operand types", fname.c_str ()); |
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353 |
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354 return retval; |
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355 } |
4908 | 356 |
357 DEFUN (bitand, args, , | |
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358 "-*- texinfo -*-\n\ |
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359 @deftypefn {} {} bitand (@var{x}, @var{y})\n\ |
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360 Return the bitwise AND of non-negative integers.\n\ |
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361 \n\ |
20486 | 362 @var{x}, @var{y} must be in the range [0,intmax]\n\ |
363 @seealso{bitor, bitxor, bitset, bitget, bitcmp, bitshift, intmax, flintmax}\n\ | |
5642 | 364 @end deftypefn") |
4908 | 365 { |
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366 return bitop ("bitand", args); |
4908 | 367 } |
368 | |
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369 /* |
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370 %!# Function bitand is tested as part of bitxor BIST tests |
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371 */ |
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372 |
4908 | 373 DEFUN (bitor, args, , |
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374 "-*- texinfo -*-\n\ |
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375 @deftypefn {} {} bitor (@var{x}, @var{y})\n\ |
20486 | 376 Return the bitwise OR of non-negative integers @var{x} and @var{y}.\n\ |
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377 \n\ |
20486 | 378 @seealso{bitor, bitxor, bitset, bitget, bitcmp, bitshift, intmax, flintmax}\n\ |
5642 | 379 @end deftypefn") |
4908 | 380 { |
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381 return bitop ("bitor", args); |
4908 | 382 } |
383 | |
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384 /* |
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385 %!# Function bitor is tested as part of bitxor BIST tests |
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386 */ |
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387 |
4908 | 388 DEFUN (bitxor, args, , |
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389 "-*- texinfo -*-\n\ |
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390 @deftypefn {} {} bitxor (@var{x}, @var{y})\n\ |
20486 | 391 Return the bitwise XOR of non-negative integers @var{x} and @var{y}.\n\ |
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392 \n\ |
20486 | 393 @seealso{bitand, bitor, bitset, bitget, bitcmp, bitshift, intmax, flintmax}\n\ |
5642 | 394 @end deftypefn") |
4908 | 395 { |
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396 return bitop ("bitxor", args); |
4908 | 397 } |
398 | |
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399 /* |
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400 %!assert (bitand (true, false), false) |
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401 %!assert (bitor (true, false), true) |
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402 %!assert (bitxor (true, false), true) |
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403 |
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404 %!assert (bitand (true, true), true) |
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405 %!assert (bitor (true, true), true) |
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406 %!assert (bitxor (true, true), false) |
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407 |
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408 %!assert (bitand (true, 5), 1) |
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409 |
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410 %!assert (bitand (true, false), false) |
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411 %!assert (bitand (true, true), true) |
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412 %!assert (bitand (true, false), false) |
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413 %!assert (bitand (true, false), false) |
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414 |
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415 ## Test idx_arg.length () == 0 |
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416 %!error <size of X and Y must match> bitand ([0 0 0], [1 0]) |
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417 %!error <size of X and Y must match> bitand ([0; 0; 0], [0 0 0]) |
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418 */ |
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419 |
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420 template <typename T> |
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421 static int64_t |
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422 max_mantissa_value () |
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423 { |
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424 return (static_cast<int64_t> (1) << std::numeric_limits<T>::digits) - 1; |
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425 } |
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426 |
5828 | 427 static int64_t |
428 bitshift (double a, int n, int64_t mask) | |
4908 | 429 { |
6108 | 430 // In the name of bug-for-bug compatibility. |
431 if (a < 0) | |
432 return -bitshift (-a, n, mask); | |
433 | |
4915 | 434 if (n > 0) |
5828 | 435 return (static_cast<int64_t> (a) << n) & mask; |
4915 | 436 else if (n < 0) |
5828 | 437 return (static_cast<int64_t> (a) >> -n) & mask; |
4915 | 438 else |
5828 | 439 return static_cast<int64_t> (a) & mask; |
4908 | 440 } |
441 | |
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442 static int64_t |
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443 bitshift (float a, int n, int64_t mask) |
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444 { |
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445 // In the name of bug-for-bug compatibility. |
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446 if (a < 0) |
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447 return -bitshift (-a, n, mask); |
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448 |
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449 if (n > 0) |
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450 return (static_cast<int64_t> (a) << n) & mask; |
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451 else if (n < 0) |
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452 return (static_cast<int64_t> (a) >> -n) & mask; |
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453 else |
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454 return static_cast<int64_t> (a) & mask; |
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455 } |
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456 |
4919 | 457 // Note that the bitshift operators are undefined if shifted by more |
458 // bits than in the type, so we need to test for the size of the | |
459 // shift. | |
460 | |
4908 | 461 #define DO_BITSHIFT(T) \ |
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462 double d1, d2; \ |
4908 | 463 \ |
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464 if (! n.all_integers (d1, d2)) \ |
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465 error ("bitshift: K must be a scalar or array of integers"); \ |
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466 \ |
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467 int m_nel = m.numel (); \ |
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468 int n_nel = n.numel (); \ |
4908 | 469 \ |
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470 bool is_scalar_op = (m_nel == 1 || n_nel == 1); \ |
4919 | 471 \ |
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472 dim_vector m_dv = m.dims (); \ |
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473 dim_vector n_dv = n.dims (); \ |
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474 \ |
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475 bool is_array_op = (m_dv == n_dv); \ |
4908 | 476 \ |
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477 if (! is_array_op && ! is_scalar_op) \ |
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478 error ("bitshift: size of A and N must match, or one operand must be a scalar"); \ |
4908 | 479 \ |
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480 T ## NDArray result; \ |
4908 | 481 \ |
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482 if (m_nel != 1) \ |
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483 result.resize (m_dv); \ |
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484 else \ |
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485 result.resize (n_dv); \ |
4908 | 486 \ |
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487 for (int i = 0; i < m_nel; i++) \ |
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488 if (is_scalar_op) \ |
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489 for (int k = 0; k < n_nel; k++) \ |
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490 if (static_cast<int> (n(k)) >= bits_in_type) \ |
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491 result(i+k) = 0; \ |
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492 else \ |
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493 result(i+k) = bitshift (m(i), static_cast<int> (n(k)), mask); \ |
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494 else \ |
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495 if (static_cast<int> (n(i)) >= bits_in_type) \ |
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496 result(i) = 0; \ |
4919 | 497 else \ |
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498 result(i) = bitshift (m(i), static_cast<int> (n(i)), mask); \ |
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499 \ |
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500 retval = result; |
4915 | 501 |
4919 | 502 #define DO_UBITSHIFT(T, N) \ |
503 do \ | |
504 { \ | |
4920 | 505 int bits_in_type = octave_ ## T :: nbits (); \ |
4919 | 506 T ## NDArray m = m_arg.T ## _array_value (); \ |
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507 octave_ ## T mask = octave_ ## T::max (); \ |
4920 | 508 if ((N) < bits_in_type) \ |
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509 mask = bitshift (mask, (N) - bits_in_type); \ |
4919 | 510 else if ((N) < 1) \ |
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511 mask = 0; \ |
4919 | 512 DO_BITSHIFT (T); \ |
513 } \ | |
4915 | 514 while (0) |
515 | |
4919 | 516 #define DO_SBITSHIFT(T, N) \ |
517 do \ | |
518 { \ | |
4920 | 519 int bits_in_type = octave_ ## T :: nbits (); \ |
4919 | 520 T ## NDArray m = m_arg.T ## _array_value (); \ |
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521 octave_ ## T mask = octave_ ## T::max (); \ |
4920 | 522 if ((N) < bits_in_type) \ |
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523 mask = bitshift (mask, (N) - bits_in_type); \ |
4919 | 524 else if ((N) < 1) \ |
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525 mask = 0; \ |
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526 mask = mask | octave_ ## T :: min (); /* FIXME: 2's complement only? */ \ |
4919 | 527 DO_BITSHIFT (T); \ |
528 } \ | |
4908 | 529 while (0) |
530 | |
531 DEFUN (bitshift, args, , | |
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532 "-*- texinfo -*-\n\ |
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533 @deftypefn {} {} bitshift (@var{a}, @var{k})\n\ |
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534 @deftypefnx {} {} bitshift (@var{a}, @var{k}, @var{n})\n\ |
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535 Return a @var{k} bit shift of @var{n}-digit unsigned integers in @var{a}.\n\ |
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536 \n\ |
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537 A positive @var{k} leads to a left shift; A negative value to a right shift.\n\ |
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538 \n\ |
20486 | 539 If @var{n} is omitted it defaults to 64.\n\ |
540 @var{n} must be in the range [1,64].\n\ | |
4908 | 541 \n\ |
542 @example\n\ | |
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543 @group\n\ |
7097 | 544 bitshift (eye (3), 1)\n\ |
4908 | 545 @result{}\n\ |
546 @group\n\ | |
547 2 0 0\n\ | |
548 0 2 0\n\ | |
549 0 0 2\n\ | |
550 @end group\n\ | |
551 \n\ | |
552 bitshift (10, [-2, -1, 0, 1, 2])\n\ | |
553 @result{} 2 5 10 20 40\n\ | |
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554 @c FIXME: restore this example when third arg is allowed to be an array.\n\ |
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555 @c\n\ |
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556 @c\n\ |
6439 | 557 @c bitshift ([1, 10], 2, [3,4])\n\ |
558 @c @result{} 4 8\n\ | |
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559 @end group\n\ |
4908 | 560 @end example\n\ |
20486 | 561 @seealso{bitand, bitor, bitxor, bitset, bitget, bitcmp, intmax, flintmax}\n\ |
5642 | 562 @end deftypefn") |
4908 | 563 { |
564 int nargin = args.length (); | |
565 | |
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566 if (nargin < 2 || nargin > 3) |
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567 print_usage (); |
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568 |
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569 NDArray n = args(1).xarray_value ("bitshift: K must be a scalar or array of integers"); |
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570 |
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571 int nbits = 64; |
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572 |
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573 if (nargin == 3) |
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574 { |
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575 // FIXME: for compatibility, we should accept an array or a scalar |
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576 // as the third argument. |
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577 if (args(2).numel () > 1) |
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578 error ("bitshift: N must be a scalar integer"); |
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579 |
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580 nbits = args(2).xint_value ("bitshift: N must be an integer"); |
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581 |
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582 if (nbits < 0) |
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583 error ("bitshift: N must be positive"); |
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584 } |
4915 | 585 |
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586 octave_value retval; |
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587 |
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588 octave_value m_arg = args(0); |
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589 std::string cname = m_arg.class_name (); |
4908 | 590 |
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591 if (cname == "double") |
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592 { |
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593 static const int bits_in_mantissa |
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594 = std::numeric_limits<double>::digits; |
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595 |
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596 nbits = (nbits < bits_in_mantissa ? nbits : bits_in_mantissa); |
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597 int64_t mask = max_mantissa_value<double> (); |
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598 if (nbits < bits_in_mantissa) |
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599 mask = mask >> (bits_in_mantissa - nbits); |
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600 else if (nbits < 1) |
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601 mask = 0; |
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602 int bits_in_type = sizeof (double) |
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603 * std::numeric_limits<unsigned char>::digits; |
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604 NDArray m = m_arg.array_value (); |
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605 DO_BITSHIFT (); |
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606 } |
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607 else if (cname == "uint8") |
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608 DO_UBITSHIFT (uint8, nbits < 8 ? nbits : 8); |
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609 else if (cname == "uint16") |
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610 DO_UBITSHIFT (uint16, nbits < 16 ? nbits : 16); |
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611 else if (cname == "uint32") |
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612 DO_UBITSHIFT (uint32, nbits < 32 ? nbits : 32); |
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613 else if (cname == "uint64") |
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614 DO_UBITSHIFT (uint64, nbits < 64 ? nbits : 64); |
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615 else if (cname == "int8") |
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616 DO_SBITSHIFT (int8, nbits < 8 ? nbits : 8); |
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617 else if (cname == "int16") |
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618 DO_SBITSHIFT (int16, nbits < 16 ? nbits : 16); |
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619 else if (cname == "int32") |
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620 DO_SBITSHIFT (int32, nbits < 32 ? nbits : 32); |
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621 else if (cname == "int64") |
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622 DO_SBITSHIFT (int64, nbits < 64 ? nbits : 64); |
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623 else if (cname == "single") |
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624 { |
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625 static const int bits_in_mantissa |
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626 = std::numeric_limits<float>::digits; |
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627 nbits = (nbits < bits_in_mantissa ? nbits : bits_in_mantissa); |
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628 int64_t mask = max_mantissa_value<float> (); |
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629 if (nbits < bits_in_mantissa) |
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630 mask = mask >> (bits_in_mantissa - nbits); |
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631 else if (nbits < 1) |
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632 mask = 0; |
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633 int bits_in_type = sizeof (float) |
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634 * std::numeric_limits<unsigned char>::digits; |
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635 FloatNDArray m = m_arg.float_array_value (); |
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636 DO_BITSHIFT (Float); |
4908 | 637 } |
638 else | |
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639 error ("bitshift: not defined for %s objects", cname.c_str ()); |
4908 | 640 |
641 return retval; | |
642 } | |
643 | |
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644 /* |
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645 %!assert (bitshift (uint8 (16), 1), uint8 ( 32)) |
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646 %!assert (bitshift (uint16 (16), 2), uint16 ( 64)) |
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647 %!assert (bitshift (uint32 (16), 3), uint32 (128)) |
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648 %!assert (bitshift (uint64 (16), 4), uint64 (256)) |
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649 %!assert (bitshift (uint8 (255), 1), uint8 (254)) |
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650 |
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651 %!error <K must be a scalar or array of integers> bitshift (16, 1.5) |
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652 %!error bitshift (16, {1}) |
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653 %!error <N must be a scalar integer> bitshift (10, [-2 -1 0 1 2], [1 1 1 1 1]) |
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654 %!error <N must be positive> bitshift (10, [-2 -1 0 1 2], -1) |
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655 */ |
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656 |
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657 DEFUN (flintmax, args, , |
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658 "-*- texinfo -*-\n\ |
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659 @deftypefn {} {} flintmax ()\n\ |
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660 @deftypefnx {} {} flintmax (\"double\")\n\ |
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661 @deftypefnx {} {} flintmax (\"single\")\n\ |
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662 Return the largest integer that can be represented consecutively in a\n\ |
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663 floating point value.\n\ |
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664 \n\ |
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665 The default class is @qcode{\"double\"}, but @qcode{\"single\"} is a valid\n\ |
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666 option. On IEEE 754 compatible systems, @code{flintmax} is\n\ |
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667 @w{@math{2^{53}}} for @qcode{\"double\"} and @w{@math{2^{24}}} for\n\ |
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668 @qcode{\"single\"}.\n\ |
20486 | 669 @seealso{intmax, realmax, realmin}\n\ |
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670 @end deftypefn") |
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671 { |
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672 int nargin = args.length (); |
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673 |
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674 if (nargin > 1) |
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675 print_usage (); |
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676 |
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677 std::string cname = "double"; |
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678 if (nargin == 1) |
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679 cname = args(0).xstring_value ("flintmax: argument must be a string"); |
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680 |
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681 if (cname == "double") |
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682 return ovl (static_cast<double> (max_mantissa_value<double> () + 1)); |
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683 else if (cname == "single") |
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684 return ovl (static_cast<float> (max_mantissa_value<float> () + 1)); |
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685 else |
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686 error ("flintmax: not defined for class '%s'", cname.c_str ()); |
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687 } |
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688 |
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2015 Code Sprint: add BIST tests to bitfcns.cc
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689 /* |
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2015 Code Sprint: add BIST tests to bitfcns.cc
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690 %!assert (flintmax (), 2^53) |
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2015 Code Sprint: add BIST tests to bitfcns.cc
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691 %!assert (flintmax ("double"), 2^53) |
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2015 Code Sprint: add BIST tests to bitfcns.cc
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692 %!assert (flintmax ("single"), single (2^24)) |
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2015 Code Sprint: add BIST tests to bitfcns.cc
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693 |
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694 %!error flintmax (0) |
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2015 Code Sprint: add BIST tests to bitfcns.cc
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695 %!error flintmax ("double", 0) |
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2015 Code Sprint: add BIST tests to bitfcns.cc
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696 %!error flintmax ("int32") |
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2015 Code Sprint: add BIST tests to bitfcns.cc
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697 %!error flintmax ("char") |
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2015 Code Sprint: add BIST tests to bitfcns.cc
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698 */ |
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699 |
4915 | 700 DEFUN (intmax, args, , |
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701 "-*- texinfo -*-\n\ |
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702 @deftypefn {} {} intmax (@var{type})\n\ |
5040 | 703 Return the largest integer that can be represented in an integer type.\n\ |
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704 \n\ |
5040 | 705 The variable @var{type} can be\n\ |
706 \n\ | |
707 @table @code\n\ | |
708 @item int8\n\ | |
709 signed 8-bit integer.\n\ | |
10840 | 710 \n\ |
5040 | 711 @item int16\n\ |
712 signed 16-bit integer.\n\ | |
10840 | 713 \n\ |
5040 | 714 @item int32\n\ |
715 signed 32-bit integer.\n\ | |
10840 | 716 \n\ |
5040 | 717 @item int64\n\ |
718 signed 64-bit integer.\n\ | |
10840 | 719 \n\ |
5040 | 720 @item uint8\n\ |
721 unsigned 8-bit integer.\n\ | |
10840 | 722 \n\ |
5040 | 723 @item uint16\n\ |
724 unsigned 16-bit integer.\n\ | |
10840 | 725 \n\ |
5040 | 726 @item uint32\n\ |
727 unsigned 32-bit integer.\n\ | |
10840 | 728 \n\ |
5040 | 729 @item uint64\n\ |
730 unsigned 64-bit integer.\n\ | |
731 @end table\n\ | |
732 \n\ | |
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733 The default for @var{type} is @code{int32}.\n\ |
20486 | 734 @seealso{intmin, flintmax}\n\ |
4908 | 735 @end deftypefn") |
736 { | |
4915 | 737 int nargin = args.length (); |
738 | |
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739 if (nargin > 1) |
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740 print_usage (); |
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|
741 |
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742 std::string cname = "int32"; |
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743 if (nargin == 1) |
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744 cname = args(0).xstring_value ("intmax: argument must be a string"); |
4915 | 745 |
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746 octave_value retval; |
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747 |
4915 | 748 if (cname == "uint8") |
5828 | 749 retval = octave_uint8 (std::numeric_limits<uint8_t>::max ()); |
4915 | 750 else if (cname == "uint16") |
5828 | 751 retval = octave_uint16 (std::numeric_limits<uint16_t>::max ()); |
4915 | 752 else if (cname == "uint32") |
5828 | 753 retval = octave_uint32 (std::numeric_limits<uint32_t>::max ()); |
4915 | 754 else if (cname == "uint64") |
5828 | 755 retval = octave_uint64 (std::numeric_limits<uint64_t>::max ()); |
4915 | 756 else if (cname == "int8") |
5828 | 757 retval = octave_int8 (std::numeric_limits<int8_t>::max ()); |
4915 | 758 else if (cname == "int16") |
5828 | 759 retval = octave_int16 (std::numeric_limits<int16_t>::max ()); |
4915 | 760 else if (cname == "int32") |
5828 | 761 retval = octave_int32 (std::numeric_limits<int32_t>::max ()); |
4915 | 762 else if (cname == "int64") |
5828 | 763 retval = octave_int64 (std::numeric_limits<int64_t>::max ()); |
4915 | 764 else |
765 error ("intmax: not defined for '%s' objects", cname.c_str ()); | |
766 | |
767 return retval; | |
768 } | |
769 | |
20870
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770 /* |
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|
771 %!assert (intmax (), int32 (2^31 - 1)) |
020b71557b12
2015 Code Sprint: add BIST tests to bitfcns.cc
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772 %!assert (intmax ("int8"), int8 (2^7 - 1)) |
020b71557b12
2015 Code Sprint: add BIST tests to bitfcns.cc
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773 %!assert (intmax ("uint8"), uint8 (2^8 - 1)) |
020b71557b12
2015 Code Sprint: add BIST tests to bitfcns.cc
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|
774 %!assert (intmax ("int16"), int16 (2^15 - 1)) |
020b71557b12
2015 Code Sprint: add BIST tests to bitfcns.cc
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775 %!assert (intmax ("uint16"), uint16 (2^16 - 1)) |
020b71557b12
2015 Code Sprint: add BIST tests to bitfcns.cc
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776 %!assert (intmax ("int32"), int32 (2^31 - 1)) |
020b71557b12
2015 Code Sprint: add BIST tests to bitfcns.cc
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777 %!assert (intmax ("uint32"), uint32 (2^32 - 1)) |
020b71557b12
2015 Code Sprint: add BIST tests to bitfcns.cc
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|
778 %!assert (intmax ("int64"), int64 (2^63 - 1)) |
020b71557b12
2015 Code Sprint: add BIST tests to bitfcns.cc
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779 %!assert (intmax ("uint64"), uint64 (2^64 - 1)) |
020b71557b12
2015 Code Sprint: add BIST tests to bitfcns.cc
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changeset
|
780 |
020b71557b12
2015 Code Sprint: add BIST tests to bitfcns.cc
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diff
changeset
|
781 %!error intmax (0) |
020b71557b12
2015 Code Sprint: add BIST tests to bitfcns.cc
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diff
changeset
|
782 %!error intmax ("int32", 0) |
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2015 Code Sprint: add BIST tests to bitfcns.cc
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783 %!error intmax ("double") |
020b71557b12
2015 Code Sprint: add BIST tests to bitfcns.cc
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changeset
|
784 %!error intmax ("char") |
020b71557b12
2015 Code Sprint: add BIST tests to bitfcns.cc
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|
785 */ |
020b71557b12
2015 Code Sprint: add BIST tests to bitfcns.cc
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|
786 |
4915 | 787 DEFUN (intmin, args, , |
17787
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788 "-*- texinfo -*-\n\ |
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1142cf6abc0d
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changeset
|
789 @deftypefn {} {} intmin (@var{type})\n\ |
5040 | 790 Return the smallest integer that can be represented in an integer type.\n\ |
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791 \n\ |
5040 | 792 The variable @var{type} can be\n\ |
793 \n\ | |
794 @table @code\n\ | |
795 @item int8\n\ | |
796 signed 8-bit integer.\n\ | |
10840 | 797 \n\ |
5040 | 798 @item int16\n\ |
799 signed 16-bit integer.\n\ | |
10840 | 800 \n\ |
5040 | 801 @item int32\n\ |
802 signed 32-bit integer.\n\ | |
10840 | 803 \n\ |
5040 | 804 @item int64\n\ |
805 signed 64-bit integer.\n\ | |
10840 | 806 \n\ |
5040 | 807 @item uint8\n\ |
808 unsigned 8-bit integer.\n\ | |
10840 | 809 \n\ |
5040 | 810 @item uint16\n\ |
811 unsigned 16-bit integer.\n\ | |
10840 | 812 \n\ |
5040 | 813 @item uint32\n\ |
814 unsigned 32-bit integer.\n\ | |
10840 | 815 \n\ |
5040 | 816 @item uint64\n\ |
817 unsigned 64-bit integer.\n\ | |
818 @end table\n\ | |
819 \n\ | |
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|
820 The default for @var{type} is @code{int32}.\n\ |
20486 | 821 @seealso{intmax, flintmax}\n\ |
4915 | 822 @end deftypefn") |
823 { | |
824 int nargin = args.length (); | |
825 | |
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826 if (nargin > 1) |
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827 print_usage (); |
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828 |
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829 std::string cname = "int32"; |
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830 if (nargin == 1) |
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831 cname = args(0).xstring_value ("intmin: argument must be a string"); |
4915 | 832 |
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833 octave_value retval; |
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834 |
4915 | 835 if (cname == "uint8") |
5828 | 836 retval = octave_uint8 (std::numeric_limits<uint8_t>::min ()); |
4915 | 837 else if (cname == "uint16") |
14846
460a3c6d8bf1
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14725
diff
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838 retval = octave_uint16 (std::numeric_limits<uint16_t>::min ()); |
4915 | 839 else if (cname == "uint32") |
5828 | 840 retval = octave_uint32 (std::numeric_limits<uint32_t>::min ()); |
4915 | 841 else if (cname == "uint64") |
5828 | 842 retval = octave_uint64 (std::numeric_limits<uint64_t>::min ()); |
4915 | 843 else if (cname == "int8") |
5828 | 844 retval = octave_int8 (std::numeric_limits<int8_t>::min ()); |
4915 | 845 else if (cname == "int16") |
5828 | 846 retval = octave_int16 (std::numeric_limits<int16_t>::min ()); |
4915 | 847 else if (cname == "int32") |
5828 | 848 retval = octave_int32 (std::numeric_limits<int32_t>::min ()); |
4915 | 849 else if (cname == "int64") |
5828 | 850 retval = octave_int64 (std::numeric_limits<int64_t>::min ()); |
4915 | 851 else |
852 error ("intmin: not defined for '%s' objects", cname.c_str ()); | |
853 | |
4908 | 854 return retval; |
855 } | |
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856 |
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857 /* |
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858 %!assert (intmin (), int32 (-2^31)) |
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2015 Code Sprint: add BIST tests to bitfcns.cc
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859 %!assert (intmin ("int8"), int8 (-2^7)) |
020b71557b12
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860 %!assert (intmin ("uint8"), uint8 (-2^8)) |
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861 %!assert (intmin ("int16"), int16 (-2^15)) |
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862 %!assert (intmin ("uint16"), uint16 (-2^16)) |
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2015 Code Sprint: add BIST tests to bitfcns.cc
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863 %!assert (intmin ("int32"), int32 (-2^31)) |
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864 %!assert (intmin ("uint32"), uint32 (-2^32)) |
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865 %!assert (intmin ("int64"), int64 (-2^63)) |
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866 %!assert (intmin ("uint64"), uint64 (-2^64)) |
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867 |
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868 %!error intmin (0) |
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869 %!error intmin ("int32", 0) |
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870 %!error intmin ("double") |
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871 %!error intmin ("char") |
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872 */ |
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873 |
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874 DEFUN (sizemax, args, , |
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875 "-*- texinfo -*-\n\ |
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876 @deftypefn {} {} sizemax ()\n\ |
10895
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877 Return the largest value allowed for the size of an array.\n\ |
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878 \n\ |
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Jaroslav Hajek <highegg@gmail.com>
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879 If Octave is compiled with 64-bit indexing, the result is of class int64,\n\ |
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880 otherwise it is of class int32. The maximum array size is slightly\n\ |
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Imrove documentation string for sizemax
Rik <octave@nomad.inbox5.com>
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881 smaller than the maximum value allowable for the relevant class as reported\n\ |
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Rik <octave@nomad.inbox5.com>
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882 by @code{intmax}.\n\ |
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883 @seealso{intmax}\n\ |
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884 @end deftypefn") |
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885 { |
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886 if (args.length () != 0) |
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887 print_usage (); |
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888 |
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889 return octave_value (octave_int<octave_idx_type> (dim_vector::dim_max ())); |
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890 } |
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2015 Code Sprint: add BIST tests to bitfcns.cc
Mike Miller <mtmiller@octave.org>
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891 |
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2015 Code Sprint: add BIST tests to bitfcns.cc
Mike Miller <mtmiller@octave.org>
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892 /* |
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893 %!assert (sizemax () >= (intmax ("int32") - 1)) |
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Mike Miller <mtmiller@octave.org>
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894 |
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2015 Code Sprint: add BIST tests to bitfcns.cc
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895 %!error sizemax (0) |
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2015 Code Sprint: add BIST tests to bitfcns.cc
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896 */ |