1 /* mpz_cmp_ui.c -- Compare an mpz_t a with an mp_limb_t b. Return positive,
2 zero, or negative based on if a > b, a == b, or a < b.
3
4 Copyright 1991, 1993-1996, 2001, 2002 Free Software Foundation, Inc.
5
6 This file is part of the GNU MP Library.
7
8 The GNU MP Library is free software; you can redistribute it and/or modify
9 it under the terms of either:
10
11 * the GNU Lesser General Public License as published by the Free
12 Software Foundation; either version 3 of the License, or (at your
13 option) any later version.
14
15 or
16
17 * the GNU General Public License as published by the Free Software
18 Foundation; either version 2 of the License, or (at your option) any
19 later version.
20
21 or both in parallel, as here.
22
23 The GNU MP Library is distributed in the hope that it will be useful, but
24 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
25 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
26 for more details.
27
28 You should have received copies of the GNU General Public License and the
29 GNU Lesser General Public License along with the GNU MP Library. If not,
30 see https://www.gnu.org/licenses/. */
31
32 #include "gmp-impl.h"
33
34 int
_mpz_cmp_ui(mpz_srcptr u,unsigned long int v_digit)35 _mpz_cmp_ui (mpz_srcptr u, unsigned long int v_digit) __GMP_NOTHROW
36 {
37 mp_ptr up;
38 mp_size_t un;
39 mp_limb_t ul;
40
41 up = PTR(u);
42 un = SIZ(u);
43
44 if (un == 0)
45 return -(v_digit != 0);
46
47 if (un == 1)
48 {
49 ul = up[0];
50 if (ul > v_digit)
51 return 1;
52 if (ul < v_digit)
53 return -1;
54 return 0;
55 }
56
57 #if GMP_NAIL_BITS != 0
58 if (v_digit > GMP_NUMB_MAX)
59 {
60 if (un == 2)
61 {
62 ul = up[0] + (up[1] << GMP_NUMB_BITS);
63
64 if ((up[1] >> GMP_NAIL_BITS) != 0)
65 return 1;
66
67 if (ul > v_digit)
68 return 1;
69 if (ul < v_digit)
70 return -1;
71 return 0;
72 }
73 }
74 #endif
75
76 return un > 0 ? 1 : -1;
77 }
78