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annotate liboctave/system/mach-info.cc @ 20830:b65888ec820e draft default tip gccjit

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dmalcom gcc jit import
author Stefan Mahr <dac922@gmx.de>
date Fri, 27 Feb 2015 16:59:36 +0100
parents 4197fc428c7d
children
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1 /*
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2
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3 Copyright (C) 1996-2015 John W. Eaton
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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 3 of the License, or (at your
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10 option) any 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, see
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19 <http://www.gnu.org/licenses/>.
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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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28 #include "lo-error.h"
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29 #include "mach-info.h"
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30 #include "singleton-cleanup.h"
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31
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32 extern "C"
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33 {
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34 double F77_FUNC (d1mach, D1MACH) (const octave_idx_type&);
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35 }
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36
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37 oct_mach_info *oct_mach_info::instance = 0;
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38
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39 union equiv
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40 {
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41 double d;
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42 int i[2];
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43 };
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44
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45 struct
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46 float_params
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47 {
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48 oct_mach_info::float_format fp_fmt;
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49 equiv fp_par[4];
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50 };
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51
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52 #define INIT_FLT_PAR(fp, fmt, sm1, sm2, lrg1, lrg2, rt1, rt2, dv1, dv2) \
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53 do \
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54 { \
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55 fp.fp_fmt = (fmt); \
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56 fp.fp_par[0].i[0] = (sm1); fp.fp_par[0].i[1] = (sm2); \
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57 fp.fp_par[1].i[0] = (lrg1); fp.fp_par[1].i[1] = (lrg2); \
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58 fp.fp_par[2].i[0] = (rt1); fp.fp_par[2].i[1] = (rt2); \
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59 fp.fp_par[3].i[0] = (dv1); fp.fp_par[3].i[1] = (dv2); \
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60 } \
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61 while (0)
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62
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63 static int
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64 equiv_compare (const equiv *std, const equiv *v, int len)
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65 {
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66 int i;
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67 for (i = 0; i < len; i++)
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68 if (v[i].i[0] != std[i].i[0] || v[i].i[1] != std[i].i[1])
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69 return 0;
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70 return 1;
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71 }
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72
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73 static oct_mach_info::float_format
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74 get_float_format (void)
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75 {
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76 oct_mach_info::float_format retval = oct_mach_info::flt_fmt_unknown;
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77
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78 float_params fp[5];
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79
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80 INIT_FLT_PAR (fp[0], oct_mach_info::flt_fmt_ieee_big_endian,
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81 1048576, 0,
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82 2146435071, -1,
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83 1017118720, 0,
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84 1018167296, 0);
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85
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86 INIT_FLT_PAR (fp[1], oct_mach_info::flt_fmt_ieee_little_endian,
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87 0, 1048576,
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88 -1, 2146435071,
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89 0, 1017118720,
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90 0, 1018167296);
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91
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92 INIT_FLT_PAR (fp[4], oct_mach_info::flt_fmt_unknown,
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93 0, 0,
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94 0, 0,
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95 0, 0,
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96 0, 0);
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97
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98 equiv mach_fp_par[4];
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99
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100 mach_fp_par[0].d = F77_FUNC (d1mach, D1MACH) (1);
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101 mach_fp_par[1].d = F77_FUNC (d1mach, D1MACH) (2);
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102 mach_fp_par[2].d = F77_FUNC (d1mach, D1MACH) (3);
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103 mach_fp_par[3].d = F77_FUNC (d1mach, D1MACH) (4);
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104
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105 int i = 0;
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106 do
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107 {
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108 if (equiv_compare (fp[i].fp_par, mach_fp_par, 4))
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109 {
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110 retval = fp[i].fp_fmt;
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111 break;
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112 }
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113 }
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114 while (fp[++i].fp_fmt != oct_mach_info::flt_fmt_unknown);
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115
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116 return retval;
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117 }
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118
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119 static bool
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120 ten_little_endians (void)
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121 {
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122 // Are we little or big endian? From Harbison & Steele.
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123
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124 union
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125 {
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126 long l;
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127 char c[sizeof (long)];
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128 } u;
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129
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130 u.l = 1;
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131
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132 return (u.c[sizeof (long) - 1] == 1);
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133 }
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134
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135 oct_mach_info::oct_mach_info (void)
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136 : native_float_fmt (get_float_format ()),
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137 big_chief (ten_little_endians ()) { }
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138
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139 bool
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140 oct_mach_info::instance_ok (void)
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141 {
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142 bool retval = true;
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143
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144 if (! instance)
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145 {
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146 instance = new oct_mach_info ();
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147
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148 if (instance)
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149 singleton_cleanup_list::add (cleanup_instance);
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150 }
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151
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152 if (! instance)
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153 {
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154 (*current_liboctave_error_handler)
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155 ("unable to create command history object!");
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156
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157 retval = false;
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158 }
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159
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160 return retval;
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161 }
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162
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163 oct_mach_info::float_format
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164 oct_mach_info::native_float_format (void)
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165 {
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166 return (instance_ok ())
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167 ? instance->native_float_fmt : oct_mach_info::flt_fmt_unknown;
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168 }
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169
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170 bool
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171 oct_mach_info::words_big_endian (void)
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172 {
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173 return (instance_ok ())
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174 ? instance->big_chief : false;
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175 }
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176
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177 bool
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178 oct_mach_info::words_little_endian (void)
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179 {
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180 return (instance_ok ())
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181 ? (! instance->big_chief) : false;
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182 }
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183
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184 oct_mach_info::float_format
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185 oct_mach_info::string_to_float_format (const std::string& s)
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186 {
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187 oct_mach_info::float_format retval = oct_mach_info::flt_fmt_unknown;
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188
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189 if (s == "native" || s == "n")
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190 retval = oct_mach_info::native_float_format ();
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191 else if (s == "ieee-be" || s == "b")
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192 retval = oct_mach_info::flt_fmt_ieee_big_endian;
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193 else if (s == "ieee-le" || s == "l")
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194 retval = oct_mach_info::flt_fmt_ieee_little_endian;
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195 else if (s == "unknown")
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196 retval = oct_mach_info::flt_fmt_unknown;
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197 else
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198 (*current_liboctave_error_handler)
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199 ("invalid architecture type specified");
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200
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201 return retval;
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202 }
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203
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204 std::string
2317
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205 oct_mach_info::float_format_as_string (float_format flt_fmt)
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206 {
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207 std::string retval = "unknown";
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208
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209 switch (flt_fmt)
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210 {
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211 case flt_fmt_ieee_big_endian:
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212 retval = "ieee-be";
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213 break;
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214
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215 case flt_fmt_ieee_little_endian:
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216 retval = "ieee-le";
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217 break;
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218
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219 default:
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220 break;
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221 }
8c09c04f7747 [project @ 1996-07-14 22:30:15 by jwe]
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222
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223 return retval;
1960
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224 }