1 | /* mpf_mul -- Multiply two floats. |
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2 | |
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3 | Copyright 1993, 1994, 1996, 2001 Free Software Foundation, Inc. |
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4 | |
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5 | This file is part of the GNU MP Library. |
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6 | |
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7 | The GNU MP Library is free software; you can redistribute it and/or modify |
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8 | it under the terms of the GNU Lesser General Public License as published by |
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9 | the Free Software Foundation; either version 2.1 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 | The GNU MP Library is distributed in the hope that it will be useful, but |
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13 | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
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15 | License for more details. |
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16 | |
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17 | You should have received a copy of the GNU Lesser General Public License |
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18 | along with the GNU MP Library; see the file COPYING.LIB. If not, write to |
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19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
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20 | MA 02111-1307, USA. */ |
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21 | |
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22 | #include "gmp.h" |
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23 | #include "gmp-impl.h" |
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24 | |
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25 | void |
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26 | mpf_mul (mpf_ptr r, mpf_srcptr u, mpf_srcptr v) |
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27 | { |
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28 | mp_srcptr up, vp; |
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29 | mp_size_t usize, vsize; |
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30 | mp_size_t sign_product; |
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31 | mp_size_t prec = r->_mp_prec; |
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32 | TMP_DECL (marker); |
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33 | |
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34 | TMP_MARK (marker); |
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35 | usize = u->_mp_size; |
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36 | vsize = v->_mp_size; |
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37 | sign_product = usize ^ vsize; |
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38 | |
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39 | usize = ABS (usize); |
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40 | vsize = ABS (vsize); |
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41 | |
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42 | up = u->_mp_d; |
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43 | vp = v->_mp_d; |
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44 | if (usize > prec) |
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45 | { |
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46 | up += usize - prec; |
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47 | usize = prec; |
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48 | } |
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49 | if (vsize > prec) |
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50 | { |
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51 | vp += vsize - prec; |
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52 | vsize = prec; |
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53 | } |
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54 | |
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55 | if (usize == 0 || vsize == 0) |
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56 | { |
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57 | r->_mp_size = 0; |
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58 | r->_mp_exp = 0; /* ??? */ |
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59 | } |
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60 | else |
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61 | { |
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62 | mp_size_t rsize; |
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63 | mp_limb_t cy_limb; |
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64 | mp_ptr rp, tp; |
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65 | mp_size_t adj; |
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66 | |
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67 | rsize = usize + vsize; |
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68 | tp = (mp_ptr) TMP_ALLOC (rsize * BYTES_PER_MP_LIMB); |
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69 | cy_limb = (usize >= vsize |
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70 | ? mpn_mul (tp, up, usize, vp, vsize) |
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71 | : mpn_mul (tp, vp, vsize, up, usize)); |
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72 | |
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73 | adj = cy_limb == 0; |
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74 | rsize -= adj; |
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75 | prec++; |
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76 | if (rsize > prec) |
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77 | { |
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78 | tp += rsize - prec; |
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79 | rsize = prec; |
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80 | } |
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81 | rp = r->_mp_d; |
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82 | MPN_COPY (rp, tp, rsize); |
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83 | r->_mp_exp = u->_mp_exp + v->_mp_exp - adj; |
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84 | r->_mp_size = sign_product >= 0 ? rsize : -rsize; |
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85 | } |
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86 | TMP_FREE (marker); |
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87 | } |
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