Annotation of OpenXM_contrib/gmp/mpf/div_ui.c, Revision 1.1.1.3
1.1 maekawa 1: /* mpf_div_ui -- Divide a float with an unsigned integer.
2:
1.1.1.3 ! ohara 3: Copyright 1993, 1994, 1996, 2000, 2001, 2002 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: mpf_div_ui (mpf_ptr r, mpf_srcptr u, unsigned long int v)
28: {
29: mp_srcptr up;
30: mp_ptr rp, tp, rtp;
31: mp_size_t usize;
32: mp_size_t rsize, tsize;
33: mp_size_t sign_quotient;
34: mp_size_t prec;
35: mp_limb_t q_limb;
36: mp_exp_t rexp;
37: TMP_DECL (marker);
1.1.1.3 ! ohara 38:
! 39: #if GMP_NAIL_BITS != 0
! 40: if (v > GMP_NUMB_MAX)
! 41: {
! 42: mpf_t vf;
! 43: mp_limb_t vl[2];
! 44: SIZ(vf) = 2;
! 45: EXP(vf) = 2;
! 46: PTR(vf) = vl;
! 47: vl[0] = v & GMP_NUMB_MASK;
! 48: vl[1] = v >> GMP_NUMB_BITS;
! 49: mpf_div (r, u, vf);
! 50: return;
! 51: }
! 52: #endif
1.1 maekawa 53:
54: usize = u->_mp_size;
55: sign_quotient = usize;
56: usize = ABS (usize);
57: prec = r->_mp_prec;
58:
59: if (v == 0)
1.1.1.2 maekawa 60: DIVIDE_BY_ZERO;
61:
1.1 maekawa 62: if (usize == 0)
63: {
64: r->_mp_size = 0;
65: r->_mp_exp = 0;
66: return;
67: }
68:
69: TMP_MARK (marker);
70:
71: rp = r->_mp_d;
72: up = u->_mp_d;
73:
74: tsize = 1 + prec;
75: tp = (mp_ptr) TMP_ALLOC ((tsize + 1) * BYTES_PER_MP_LIMB);
76:
77: if (usize > tsize)
78: {
79: up += usize - tsize;
80: usize = tsize;
81: rtp = tp;
82: }
83: else
84: {
85: MPN_ZERO (tp, tsize - usize);
86: rtp = tp + (tsize - usize);
87: }
88:
89: /* Move the dividend to the remainder. */
90: MPN_COPY (rtp, up, usize);
91:
92: mpn_divmod_1 (rp, tp, tsize, (mp_limb_t) v);
93: q_limb = rp[tsize - 1];
94:
95: rsize = tsize - (q_limb == 0);
96: rexp = u->_mp_exp - (q_limb == 0);
97: r->_mp_size = sign_quotient >= 0 ? rsize : -rsize;
98: r->_mp_exp = rexp;
99: TMP_FREE (marker);
100: }
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