| Austin Schuh | bb1338c | 2024-06-15 19:31:16 -0700 | [diff] [blame] | 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 |
| 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 | } |