| 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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