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, 1994, 1995, 1996, 2000, 2001, 2002 Free Software 5 Foundation, Inc. 6 7 This file is part of the GNU MP Library. 8 9 The GNU MP Library is free software; you can redistribute it and/or modify 10 it under the terms of the GNU Lesser General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or (at your 12 option) any later version. 13 14 The GNU MP Library is distributed in the hope that it will be useful, but 15 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17 License for more details. 18 19 You should have received a copy of the GNU Lesser General Public License 20 along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */ 21 22 #include "gmp.h" 23 #include "gmp-impl.h" 24 25 int 26 _mpz_cmp_si (mpz_srcptr u, signed long int v_digit) __GMP_NOTHROW 27 { 28 mp_size_t usize = u->_mp_size; 29 mp_size_t vsize; 30 mp_limb_t u_digit; 31 unsigned long int absv_digit = (unsigned long int) v_digit; 32 33 #if GMP_NAIL_BITS != 0 34 /* FIXME. This isn't very pretty. */ 35 mpz_t tmp; 36 mp_limb_t tt[2]; 37 PTR(tmp) = tt; 38 ALLOC(tmp) = 2; 39 mpz_set_si (tmp, v_digit); 40 return mpz_cmp (u, tmp); 41 #endif 42 43 vsize = 0; 44 if (v_digit > 0) 45 vsize = 1; 46 else if (v_digit < 0) 47 { 48 vsize = -1; 49 absv_digit = -absv_digit; 50 } 51 52 if (usize != vsize) 53 return usize - vsize; 54 55 if (usize == 0) 56 return 0; 57 58 u_digit = u->_mp_d[0]; 59 60 if (u_digit == (mp_limb_t) absv_digit) 61 return 0; 62 63 if (u_digit > (mp_limb_t) absv_digit) 64 return usize; 65 else 66 return -usize; 67 } 68