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1 /* |
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2 |
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2847
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3 Copyright (C) 1996, 1997 John W. Eaton |
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1960
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY 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 Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 #ifdef HAVE_CONFIG_H |
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25 #include <config.h> |
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26 #endif |
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27 |
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28 #include "f77-fcn.h" |
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2317
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29 #include "lo-error.h" |
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30 #include "mach-info.h" |
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31 #include "oct-types.h" |
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32 |
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33 extern "C" |
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34 { |
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35 double F77_FUNC (d1mach, D1MACH) (const octave_idx_type&); |
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36 } |
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37 |
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38 oct_mach_info *oct_mach_info::instance = 0; |
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39 |
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40 union equiv |
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41 { |
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42 double d; |
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43 int i[2]; |
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44 }; |
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45 |
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46 struct |
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47 float_params |
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48 { |
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49 oct_mach_info::float_format fp_fmt; |
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50 equiv fp_par[4]; |
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51 }; |
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52 |
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53 #define INIT_FLT_PAR(fp, fmt, sm1, sm2, lrg1, lrg2, rt1, rt2, dv1, dv2) \ |
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54 do \ |
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55 { \ |
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56 fp.fp_fmt = (fmt); \ |
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57 fp.fp_par[0].i[0] = (sm1); fp.fp_par[0].i[1] = (sm2); \ |
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58 fp.fp_par[1].i[0] = (lrg1); fp.fp_par[1].i[1] = (lrg2); \ |
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59 fp.fp_par[2].i[0] = (rt1); fp.fp_par[2].i[1] = (rt2); \ |
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60 fp.fp_par[3].i[0] = (dv1); fp.fp_par[3].i[1] = (dv2); \ |
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61 } \ |
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62 while (0) |
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63 |
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64 static int |
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65 equiv_compare (const equiv *std, const equiv *v, int len) |
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66 { |
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67 int i; |
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68 for (i = 0; i < len; i++) |
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69 if (v[i].i[0] != std[i].i[0] || v[i].i[1] != std[i].i[1]) |
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70 return 0; |
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71 return 1; |
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72 } |
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73 |
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74 void |
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75 oct_mach_info::init_float_format (void) const |
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76 { |
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77 #if defined (CRAY) |
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78 |
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79 // FIXME -- this should be determined automatically. |
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80 |
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81 native_float_fmt = oct_mach_info::flt_fmt_cray; |
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82 |
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83 #else |
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84 |
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85 float_params fp[5]; |
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86 |
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87 INIT_FLT_PAR (fp[0], oct_mach_info::flt_fmt_ieee_big_endian, |
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88 1048576, 0, |
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89 2146435071, -1, |
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90 1017118720, 0, |
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91 1018167296, 0); |
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92 |
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93 INIT_FLT_PAR (fp[1], oct_mach_info::flt_fmt_ieee_little_endian, |
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94 0, 1048576, |
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95 -1, 2146435071, |
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96 0, 1017118720, |
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97 0, 1018167296); |
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98 |
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99 INIT_FLT_PAR (fp[2], oct_mach_info::flt_fmt_vax_d, |
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100 128, 0, |
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101 -32769, -1, |
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102 9344, 0, |
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103 9344, 0); |
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104 |
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105 INIT_FLT_PAR (fp[3], oct_mach_info::flt_fmt_vax_g, |
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106 16, 0, |
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107 -32769, -1, |
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108 15552, 0, |
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109 15552, 0); |
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110 |
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111 INIT_FLT_PAR (fp[4], oct_mach_info::flt_fmt_unknown, |
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112 0, 0, |
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113 0, 0, |
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114 0, 0, |
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115 0, 0); |
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116 |
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117 equiv mach_fp_par[4]; |
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118 |
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119 mach_fp_par[0].d = F77_FUNC (d1mach, D1MACH) (1); |
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120 mach_fp_par[1].d = F77_FUNC (d1mach, D1MACH) (2); |
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121 mach_fp_par[2].d = F77_FUNC (d1mach, D1MACH) (3); |
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122 mach_fp_par[3].d = F77_FUNC (d1mach, D1MACH) (4); |
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123 |
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124 int i = 0; |
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125 do |
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126 { |
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127 if (equiv_compare (fp[i].fp_par, mach_fp_par, 4)) |
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128 { |
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129 native_float_fmt = fp[i].fp_fmt; |
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130 break; |
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131 } |
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132 } |
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133 while (fp[++i].fp_fmt != oct_mach_info::flt_fmt_unknown); |
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134 |
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135 #endif |
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136 } |
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137 |
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138 void |
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139 oct_mach_info::ten_little_endians (void) const |
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140 { |
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141 // Are we little or big endian? From Harbison & Steele. |
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142 |
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143 union |
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144 { |
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145 long l; |
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146 char c[sizeof (long)]; |
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147 } u; |
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148 |
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149 u.l = 1; |
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150 |
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151 big_chief = (u.c[sizeof (long) - 1] == 1); |
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152 } |
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153 |
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154 oct_mach_info::oct_mach_info (void) |
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155 { |
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156 init_float_format (); |
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157 ten_little_endians (); |
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158 } |
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159 |
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160 bool |
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161 oct_mach_info::instance_ok (void) |
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162 { |
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163 bool retval = true; |
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164 |
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165 if (! instance) |
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166 instance = new oct_mach_info (); |
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167 |
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168 if (! instance) |
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169 { |
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170 (*current_liboctave_error_handler) |
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171 ("unable to create command history object!"); |
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172 |
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173 retval = false; |
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174 } |
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175 |
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176 return retval; |
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177 } |
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178 |
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179 oct_mach_info::float_format |
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180 oct_mach_info::native_float_format (void) |
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181 { |
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182 return (instance_ok ()) |
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183 ? instance->native_float_fmt : oct_mach_info::flt_fmt_unknown; |
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184 } |
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185 |
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186 bool |
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187 oct_mach_info::words_big_endian (void) |
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188 { |
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189 return (instance_ok ()) |
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190 ? instance->big_chief : false; |
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191 } |
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192 |
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193 bool |
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194 oct_mach_info::words_little_endian (void) |
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195 { |
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196 return (instance_ok ()) |
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197 ? (! instance->big_chief) : false; |
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198 } |
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199 |
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200 oct_mach_info::float_format |
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201 oct_mach_info::string_to_float_format (const std::string& s) |
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202 { |
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203 oct_mach_info::float_format retval = oct_mach_info::flt_fmt_unknown; |
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204 |
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205 if (s == "native" || s == "n") |
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206 retval = oct_mach_info::native_float_format (); |
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207 else if (s == "ieee-be" || s == "b") |
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208 retval = oct_mach_info::flt_fmt_ieee_big_endian; |
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209 else if (s == "ieee-le" || s == "l") |
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210 retval = oct_mach_info::flt_fmt_ieee_little_endian; |
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211 else if (s == "vaxd" || s == "d") |
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212 retval = oct_mach_info::flt_fmt_vax_d; |
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213 else if (s == "vaxg" || s == "g") |
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214 retval = oct_mach_info::flt_fmt_vax_g; |
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215 else if (s == "cray" || s == "c") |
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216 retval = oct_mach_info::flt_fmt_cray; |
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217 else if (s == "unknown") |
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218 retval = oct_mach_info::flt_fmt_unknown; |
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219 else |
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220 (*current_liboctave_error_handler) |
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221 ("invalid architecture type specified"); |
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222 |
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223 return retval; |
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224 } |
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225 |
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226 std::string |
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227 oct_mach_info::float_format_as_string (float_format flt_fmt) |
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228 { |
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229 std::string retval = "unknown"; |
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230 |
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231 switch (flt_fmt) |
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232 { |
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233 case flt_fmt_ieee_big_endian: |
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234 retval = "ieee_big_endian"; |
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235 break; |
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236 |
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237 case flt_fmt_ieee_little_endian: |
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238 retval = "ieee_little_endian"; |
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239 break; |
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240 |
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241 case flt_fmt_vax_d: |
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242 retval = "vax_d_float"; |
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243 break; |
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244 |
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245 case flt_fmt_vax_g: |
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246 retval = "vax_g_float"; |
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247 break; |
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248 |
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249 case flt_fmt_cray: |
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250 retval = "cray"; |
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251 break; |
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252 |
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253 default: |
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254 break; |
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255 } |
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256 |
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257 return retval; |
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258 } |
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259 |
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260 /* |
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261 ;;; Local Variables: *** |
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262 ;;; mode: C++ *** |
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263 ;;; End: *** |
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264 */ |
