1 /* mpz_ui_sub -- Subtract an unsigned one-word integer and an mpz_t.
3 Copyright 2002, 2004 Free Software Foundation, Inc.
5 This file is part of the GNU MP Library.
7 The GNU MP Library is free software; you can redistribute it and/or modify
8 it under the terms of the GNU Lesser General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or (at your
10 option) any later version.
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
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15 License for more details.
17 You should have received a copy of the GNU Lesser General Public License
18 along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
24 mpz_ui_sub (mpz_ptr w, unsigned long int uval, mpz_srcptr v)
30 #if BITS_PER_ULONG > GMP_NUMB_BITS /* avoid warnings about shift amount */
31 if (uval > GMP_NUMB_MAX)
36 ul[0] = uval & GMP_NUMB_MASK;
37 ul[1] = uval >> GMP_NUMB_BITS;
51 wp = MPZ_REALLOC (w, vn);
53 mpn_sub_1 (wp, vp, vn, (mp_limb_t) uval);
54 wn = -(vn - (wp[vn - 1] == 0));
77 wp = MPZ_REALLOC (w, vn + 1);
79 cy = mpn_add_1 (wp, vp, vn, (mp_limb_t) uval);