1 /* mpz_add_ui -- Add an MP_INT and an unsigned one-word integer.
3 Copyright (C) 1991 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 General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 The GNU MP Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with the GNU MP Library; see the file COPYING. If not, write to
19 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
26 mpz_add_ui (MP_INT *sum, const MP_INT *add1, mp_limb add2)
28 mpz_add_ui (sum, add1, add2)
36 mp_size add1size, sumsize;
39 add1size = add1->size;
40 abs_add1size = ABS (add1size);
42 /* If not space for SUM (and possible carry), increase space. */
43 sumsize = abs_add1size + 1;
44 if (sum->alloc < sumsize)
45 _mpz_realloc (sum, sumsize);
47 /* These must be after realloc (ADD1 may be the same as SUM). */
53 MPN_COPY (sump, add1p, abs_add1size);
57 if (abs_add1size == 0)
66 sumsize = mpn_add (sump, add1p, abs_add1size, &add2, 1);
68 sump[abs_add1size] = 1;
69 sumsize = sumsize + abs_add1size;
73 /* The signs are different. Need exact comparision to determine
74 which operand to subtract from which. */
75 if (abs_add1size == 1 && add1p[0] < add2)
76 sumsize = (abs_add1size
77 + mpn_sub (sump, &add2, 1, add1p, 1));
79 sumsize = -(abs_add1size
80 + mpn_sub (sump, add1p, abs_add1size, &add2, 1));