Annotation of OpenXM_contrib/gmp/mpf/div_ui.c, Revision 1.1.1.2
1.1 maekawa 1: /* mpf_div_ui -- Divide a float with an unsigned integer.
2:
1.1.1.2 ! maekawa 3: Copyright (C) 1993, 1994, 1996, 2000 Free Software Foundation, Inc.
1.1 maekawa 4:
5: This file is part of the GNU MP Library.
6:
7: The GNU MP Library is free software; you can redistribute it and/or modify
1.1.1.2 ! maekawa 8: it under the terms of the GNU Lesser General Public License as published by
! 9: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1 maekawa 10: option) any later version.
11:
12: The GNU MP Library is distributed in the hope that it will be useful, but
13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
1.1.1.2 ! maekawa 14: or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
1.1 maekawa 15: License for more details.
16:
1.1.1.2 ! maekawa 17: You should have received a copy of the GNU Lesser General Public License
1.1 maekawa 18: along with the GNU MP Library; see the file COPYING.LIB. If not, write to
19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20: MA 02111-1307, USA. */
21:
22: #include "gmp.h"
23: #include "gmp-impl.h"
24: #include "longlong.h"
25:
26: void
27: #if __STDC__
28: mpf_div_ui (mpf_ptr r, mpf_srcptr u, unsigned long int v)
29: #else
30: mpf_div_ui (r, u, v)
31: mpf_ptr r;
32: mpf_srcptr u;
33: unsigned long int v;
34: #endif
35: {
36: mp_srcptr up;
37: mp_ptr rp, tp, rtp;
38: mp_size_t usize;
39: mp_size_t rsize, tsize;
40: mp_size_t sign_quotient;
41: mp_size_t prec;
42: mp_limb_t q_limb;
43: mp_exp_t rexp;
44: TMP_DECL (marker);
45:
46: usize = u->_mp_size;
47: sign_quotient = usize;
48: usize = ABS (usize);
49: prec = r->_mp_prec;
50:
51: if (v == 0)
1.1.1.2 ! maekawa 52: DIVIDE_BY_ZERO;
! 53:
1.1 maekawa 54: if (usize == 0)
55: {
56: r->_mp_size = 0;
57: r->_mp_exp = 0;
58: return;
59: }
60:
61: TMP_MARK (marker);
62:
63: rp = r->_mp_d;
64: up = u->_mp_d;
65:
66: tsize = 1 + prec;
67: tp = (mp_ptr) TMP_ALLOC ((tsize + 1) * BYTES_PER_MP_LIMB);
68:
69: if (usize > tsize)
70: {
71: up += usize - tsize;
72: usize = tsize;
73: rtp = tp;
74: }
75: else
76: {
77: MPN_ZERO (tp, tsize - usize);
78: rtp = tp + (tsize - usize);
79: }
80:
81: /* Move the dividend to the remainder. */
82: MPN_COPY (rtp, up, usize);
83:
84: mpn_divmod_1 (rp, tp, tsize, (mp_limb_t) v);
85: q_limb = rp[tsize - 1];
86:
87: rsize = tsize - (q_limb == 0);
88: rexp = u->_mp_exp - (q_limb == 0);
89: r->_mp_size = sign_quotient >= 0 ? rsize : -rsize;
90: r->_mp_exp = rexp;
91: TMP_FREE (marker);
92: }
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