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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 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 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 #if !defined (octave_sun_utils_h) |
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24 #define octave_sun_utils_h 1 |
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25 |
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26 // This is only needed to dereference pointers to doubles if mixing |
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27 // GCC and Sun f77/cc compiled code. See the GCC manual (where the |
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28 // function access_double() is described) and the Sun f77 manual, |
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29 // which explains that doubles are not always aligned on 8 byte |
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30 // boundaries. |
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31 |
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32 #if defined (sun) && defined (__GNUC__) |
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33 |
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34 inline double |
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35 access_double (double *unaligned_ptr) |
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36 { |
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37 union d2i { double d; int i[2]; }; |
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38 |
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39 union d2i *p = (union d2i *) unaligned_ptr; |
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40 union d2i u; |
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41 |
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42 u.i[0] = p->i[0]; |
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43 u.i[1] = p->i[1]; |
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44 |
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45 return u.d; |
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46 } |
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47 |
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48 inline void |
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49 assign_double (double *unaligned_ptr, double value) |
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50 { |
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51 union d2i { double d; int i[2]; }; |
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52 |
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53 double *ptr = &value; |
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54 union d2i *v = (union d2i *) ptr; |
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55 union d2i *p = (union d2i *) unaligned_ptr; |
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56 |
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57 p->i[0] = v->i[0]; |
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58 p->i[1] = v->i[1]; |
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59 } |
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60 |
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61 #endif |
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62 #endif |
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63 |
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64 /* |
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65 ;;; Local Variables: *** |
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66 ;;; mode: C *** |
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67 ;;; page-delimiter: "^/\\*" *** |
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68 ;;; End: *** |
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69 */ |
