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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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include "f77-fcn.h" |
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2317
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28 #include "lo-error.h" |
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29 #include "mach-info.h" |
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30 |
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31 extern "C" |
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32 { |
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3887
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33 double F77_FUNC (d1mach, D1MACH) (const int&); |
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34 } |
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35 |
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36 oct_mach_info *oct_mach_info::instance = 0; |
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37 |
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38 union equiv |
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39 { |
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40 double d; |
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41 int i[2]; |
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42 }; |
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43 |
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44 struct |
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45 float_params |
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46 { |
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47 oct_mach_info::float_format fp_fmt; |
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48 equiv fp_par[4]; |
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49 }; |
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50 |
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51 #define INIT_FLT_PAR(fp, fmt, sm1, sm2, lrg1, lrg2, rt1, rt2, dv1, dv2) \ |
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52 do \ |
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53 { \ |
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54 fp.fp_fmt = (fmt); \ |
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55 fp.fp_par[0].i[0] = (sm1); fp.fp_par[0].i[1] = (sm2); \ |
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56 fp.fp_par[1].i[0] = (lrg1); fp.fp_par[1].i[1] = (lrg2); \ |
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57 fp.fp_par[2].i[0] = (rt1); fp.fp_par[2].i[1] = (rt2); \ |
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58 fp.fp_par[3].i[0] = (dv1); fp.fp_par[3].i[1] = (dv2); \ |
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59 } \ |
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60 while (0) |
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61 |
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62 static int |
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63 equiv_compare (const equiv *std, const equiv *v, int len) |
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64 { |
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65 int i; |
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66 for (i = 0; i < len; i++) |
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67 if (v[i].i[0] != std[i].i[0] || v[i].i[1] != std[i].i[1]) |
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68 return 0; |
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69 return 1; |
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70 } |
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71 |
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72 void |
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73 oct_mach_info::init_float_format (void) const |
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74 { |
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4605
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75 #if defined (CRAY) |
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76 |
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77 // XXX FIXME XXX -- this should be determined automatically. |
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78 |
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79 native_float_fmt = oct_mach_info::flt_fmt_cray; |
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80 |
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81 #else |
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82 |
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83 float_params fp[5]; |
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84 |
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85 INIT_FLT_PAR (fp[0], oct_mach_info::flt_fmt_ieee_big_endian, |
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86 1048576, 0, |
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87 2146435071, -1, |
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88 1017118720, 0, |
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89 1018167296, 0); |
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90 |
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91 INIT_FLT_PAR (fp[1], oct_mach_info::flt_fmt_ieee_little_endian, |
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92 0, 1048576, |
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93 -1, 2146435071, |
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94 0, 1017118720, |
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95 0, 1018167296); |
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96 |
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97 INIT_FLT_PAR (fp[2], oct_mach_info::flt_fmt_vax_d, |
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98 128, 0, |
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99 -32769, -1, |
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100 9344, 0, |
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101 9344, 0); |
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102 |
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103 INIT_FLT_PAR (fp[3], oct_mach_info::flt_fmt_vax_g, |
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104 16, 0, |
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105 -32769, -1, |
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106 15552, 0, |
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107 15552, 0); |
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108 |
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109 INIT_FLT_PAR (fp[4], oct_mach_info::flt_fmt_unknown, |
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110 0, 0, |
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111 0, 0, |
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112 0, 0, |
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113 0, 0); |
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114 |
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115 equiv mach_fp_par[4]; |
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116 |
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117 mach_fp_par[0].d = F77_FUNC (d1mach, D1MACH) (1); |
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118 mach_fp_par[1].d = F77_FUNC (d1mach, D1MACH) (2); |
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119 mach_fp_par[2].d = F77_FUNC (d1mach, D1MACH) (3); |
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120 mach_fp_par[3].d = F77_FUNC (d1mach, D1MACH) (4); |
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121 |
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122 int i = 0; |
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123 do |
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124 { |
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125 if (equiv_compare (fp[i].fp_par, mach_fp_par, 4)) |
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126 { |
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127 native_float_fmt = fp[i].fp_fmt; |
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128 break; |
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129 } |
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130 } |
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131 while (fp[++i].fp_fmt != oct_mach_info::flt_fmt_unknown); |
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132 |
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133 #endif |
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134 } |
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135 |
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136 void |
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137 oct_mach_info::ten_little_endians (void) const |
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138 { |
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139 // Are we little or big endian? From Harbison & Steele. |
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140 |
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141 union |
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142 { |
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143 long l; |
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144 char c[sizeof (long)]; |
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145 } u; |
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146 |
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147 u.l = 1; |
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148 |
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149 big_chief = (u.c[sizeof (long) - 1] == 1); |
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150 } |
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151 |
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152 oct_mach_info::oct_mach_info (void) |
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153 { |
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154 init_float_format (); |
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155 ten_little_endians (); |
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156 } |
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157 |
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158 bool |
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159 oct_mach_info::instance_ok (void) |
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160 { |
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161 bool retval = true; |
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162 |
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163 if (! instance) |
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164 instance = new oct_mach_info (); |
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165 |
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166 if (! instance) |
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167 { |
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168 (*current_liboctave_error_handler) |
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169 ("unable to create command history object!"); |
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170 |
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171 retval = false; |
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172 } |
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173 |
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174 return retval; |
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175 } |
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176 |
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177 oct_mach_info::float_format |
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178 oct_mach_info::native_float_format (void) |
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179 { |
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180 return (instance_ok ()) |
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181 ? instance->native_float_fmt : oct_mach_info::flt_fmt_unknown; |
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182 } |
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183 |
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184 bool |
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185 oct_mach_info::words_big_endian (void) |
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186 { |
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187 return (instance_ok ()) |
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188 ? instance->big_chief : false; |
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189 } |
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190 |
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191 bool |
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192 oct_mach_info::words_little_endian (void) |
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193 { |
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194 return (instance_ok ()) |
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195 ? (! instance->big_chief) : false; |
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196 } |
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197 |
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198 oct_mach_info::float_format |
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199 oct_mach_info::string_to_float_format (const std::string& s) |
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200 { |
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201 oct_mach_info::float_format retval = oct_mach_info::flt_fmt_unknown; |
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202 |
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203 if (s == "native" || s == "n") |
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204 retval = oct_mach_info::native_float_format (); |
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205 else if (s == "ieee-be" || s == "b") |
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206 retval = oct_mach_info::flt_fmt_ieee_big_endian; |
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207 else if (s == "ieee-le" || s == "l") |
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208 retval = oct_mach_info::flt_fmt_ieee_little_endian; |
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209 else if (s == "vaxd" || s == "d") |
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210 retval = oct_mach_info::flt_fmt_vax_d; |
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211 else if (s == "vaxg" || s == "g") |
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212 retval = oct_mach_info::flt_fmt_vax_g; |
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213 else if (s == "cray" || s == "c") |
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214 retval = oct_mach_info::flt_fmt_cray; |
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215 else if (s == "unknown") |
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216 retval = oct_mach_info::flt_fmt_unknown; |
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217 else |
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218 (*current_liboctave_error_handler) |
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219 ("invalid architecture type specified"); |
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220 |
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221 return retval; |
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222 } |
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223 |
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224 std::string |
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225 oct_mach_info::float_format_as_string (float_format flt_fmt) |
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226 { |
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227 std::string retval = "unknown"; |
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228 |
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229 switch (flt_fmt) |
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230 { |
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231 case flt_fmt_ieee_big_endian: |
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232 retval = "ieee_big_endian"; |
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233 break; |
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234 |
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235 case flt_fmt_ieee_little_endian: |
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236 retval = "ieee_little_endian"; |
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237 break; |
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238 |
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239 case flt_fmt_vax_d: |
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240 retval = "vax_d_float"; |
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241 break; |
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242 |
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243 case flt_fmt_vax_g: |
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244 retval = "vax_g_float"; |
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245 break; |
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246 |
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247 case flt_fmt_cray: |
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248 retval = "cray"; |
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249 break; |
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250 |
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251 default: |
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252 break; |
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253 } |
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254 |
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255 return retval; |
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256 } |
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257 |
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258 /* |
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259 ;;; Local Variables: *** |
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260 ;;; mode: C++ *** |
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261 ;;; End: *** |
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262 */ |
