Annotation of OpenXM_contrib/gmp/mpz/tdiv_r_ui.c, Revision 1.1.1.3
1.1 maekawa 1: /* mpz_tdiv_r_ui(rem, dividend, divisor_limb)
2: -- Set REM to DIVDEND mod DIVISOR_LIMB.
3:
1.1.1.3 ! ohara 4: Copyright 1991, 1993, 1994, 1996, 1998, 2001, 2002 Free Software Foundation,
! 5: Inc.
1.1 maekawa 6:
7: This file is part of the GNU MP Library.
8:
9: The GNU MP Library is free software; you can redistribute it and/or modify
1.1.1.2 maekawa 10: it under the terms of the GNU Lesser General Public License as published by
11: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1 maekawa 12: option) any later version.
13:
14: The GNU MP Library is distributed in the hope that it will be useful, but
15: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
1.1.1.2 maekawa 16: or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
1.1 maekawa 17: License for more details.
18:
1.1.1.2 maekawa 19: You should have received a copy of the GNU Lesser General Public License
1.1 maekawa 20: along with the GNU MP Library; see the file COPYING.LIB. If not, write to
21: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22: MA 02111-1307, USA. */
23:
24: #include "gmp.h"
25: #include "gmp-impl.h"
26:
1.1.1.2 maekawa 27: unsigned long int
1.1 maekawa 28: mpz_tdiv_r_ui (mpz_ptr rem, mpz_srcptr dividend, unsigned long int divisor)
29: {
1.1.1.3 ! ohara 30: mp_size_t ns, nn;
! 31: mp_ptr np;
! 32: mp_limb_t rl;
1.1 maekawa 33:
1.1.1.2 maekawa 34: if (divisor == 0)
35: DIVIDE_BY_ZERO;
36:
1.1.1.3 ! ohara 37: ns = SIZ(dividend);
! 38: if (ns == 0)
! 39: {
! 40: SIZ(rem) = 0;
! 41: return 0;
! 42: }
1.1 maekawa 43:
1.1.1.3 ! ohara 44: nn = ABS(ns);
! 45: np = PTR(dividend);
! 46: #if GMP_NAIL_BITS != 0
! 47: if (divisor > GMP_NUMB_MAX)
! 48: {
! 49: mp_limb_t dp[2];
! 50: mp_ptr rp, qp;
! 51: mp_size_t rn;
! 52: TMP_DECL (mark);
! 53:
! 54: if (nn == 1) /* tdiv_qr requirements; tested above for 0 */
! 55: {
! 56: rl = np[0];
! 57: SIZ(rem) = ns >= 0 ? 1 : -1;
! 58: PTR(rem)[0] = rl;
! 59: return rl;
! 60: }
! 61:
! 62: MPZ_REALLOC (rem, 2);
! 63: rp = PTR(rem);
! 64:
! 65: TMP_MARK (mark);
! 66: dp[0] = divisor & GMP_NUMB_MASK;
! 67: dp[1] = divisor >> GMP_NUMB_BITS;
! 68: qp = TMP_ALLOC_LIMBS (nn - 2 + 1);
! 69: mpn_tdiv_qr (qp, rp, (mp_size_t) 0, np, nn, dp, (mp_size_t) 2);
! 70: TMP_FREE (mark);
! 71: rl = rp[0] + (rp[1] << GMP_NUMB_BITS);
! 72: rn = 2 - (rp[1] == 0); rn -= (rp[rn - 1] == 0);
! 73: SIZ(rem) = ns >= 0 ? rn : -rn;
! 74: }
1.1 maekawa 75: else
1.1.1.3 ! ohara 76: #endif
1.1 maekawa 77: {
1.1.1.3 ! ohara 78: rl = mpn_mod_1 (np, nn, (mp_limb_t) divisor);
! 79: if (rl == 0)
! 80: SIZ(rem) = 0;
! 81: else
! 82: {
! 83: /* Store the single-limb remainder. We don't check if there's space
! 84: for just one limb, since no function ever makes zero space. */
! 85: SIZ(rem) = ns >= 0 ? 1 : -1;
! 86: PTR(rem)[0] = rl;
! 87: }
1.1 maekawa 88: }
1.1.1.2 maekawa 89:
1.1.1.3 ! ohara 90: return rl;
1.1 maekawa 91: }
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