| Austin Schuh | dace2a6 | 2020-08-18 10:56:48 -0700 | [diff] [blame^] | 1 | /* mpz_cmp_si(u,v) -- Compare an integer U with a single-word int V. |
| 2 | Return positive, zero, or negative based on if U > V, U == V, or U < V. |
| 3 | |
| 4 | Copyright 1991, 1993-1996, 2000-2002, 2012, 2013 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_si (mpz_srcptr u, signed long int v_digit) __GMP_NOTHROW |
| 36 | { |
| 37 | #if GMP_NAIL_BITS != 0 |
| 38 | /* FIXME. This isn't very pretty. */ |
| 39 | mpz_t tmp; |
| 40 | mp_limb_t tt[2]; |
| 41 | PTR(tmp) = tt; |
| 42 | ALLOC(tmp) = 2; |
| 43 | mpz_set_si (tmp, v_digit); |
| 44 | return mpz_cmp (u, tmp); |
| 45 | #else |
| 46 | |
| 47 | mp_size_t vsize, usize; |
| 48 | |
| 49 | usize = SIZ (u); |
| 50 | vsize = (v_digit > 0) - (v_digit < 0); |
| 51 | |
| 52 | if ((usize == 0) | (usize != vsize)) |
| 53 | return usize - vsize; |
| 54 | else { |
| 55 | mp_limb_t u_digit, absv_digit; |
| 56 | |
| 57 | u_digit = PTR (u)[0]; |
| 58 | absv_digit = ABS_CAST (unsigned long, v_digit); |
| 59 | |
| 60 | if (u_digit == absv_digit) |
| 61 | return 0; |
| 62 | |
| 63 | if (u_digit > absv_digit) |
| 64 | return usize; |
| 65 | else |
| 66 | return -usize; |
| 67 | } |
| 68 | #endif |
| 69 | } |