1 | /* mpz_cmp_si(u,v) -- Compare an integer U with a single-word int V. |
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2 | Return positive, zero, or negative based on if U > V, U == V, or U < V. |
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3 | |
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4 | Copyright 1991, 1993, 1994, 1995, 1996, 2000, 2001, 2002 Free Software |
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5 | Foundation, Inc. |
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6 | |
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7 | This file is part of the GNU MP Library. |
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8 | |
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9 | The GNU MP Library is free software; you can redistribute it and/or modify |
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10 | it under the terms of the GNU Lesser General Public License as published by |
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11 | the Free Software Foundation; either version 2.1 of the License, or (at your |
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12 | option) any later version. |
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13 | |
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14 | The GNU MP Library is distributed in the hope that it will be useful, but |
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15 | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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16 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
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17 | License for more details. |
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18 | |
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19 | You should have received a copy of the GNU Lesser General Public License |
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20 | along with the GNU MP Library; see the file COPYING.LIB. If not, write to |
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21 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
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22 | MA 02111-1307, USA. */ |
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23 | |
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24 | #include "gmp.h" |
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25 | #include "gmp-impl.h" |
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26 | |
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27 | int |
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28 | _mpz_cmp_si (mpz_srcptr u, signed long int v_digit) |
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29 | { |
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30 | mp_size_t usize = u->_mp_size; |
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31 | mp_size_t vsize; |
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32 | mp_limb_t u_digit; |
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33 | |
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34 | #if GMP_NAIL_BITS != 0 |
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35 | /* FIXME. This isn't very pretty. */ |
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36 | mpz_t tmp; |
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37 | mp_limb_t tt[2]; |
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38 | PTR(tmp) = tt; |
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39 | ALLOC(tmp) = 2; |
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40 | mpz_set_si (tmp, v_digit); |
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41 | return mpz_cmp (u, tmp); |
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42 | #endif |
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43 | |
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44 | vsize = 0; |
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45 | if (v_digit > 0) |
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46 | vsize = 1; |
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47 | else if (v_digit < 0) |
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48 | { |
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49 | vsize = -1; |
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50 | v_digit = -v_digit; |
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51 | } |
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52 | |
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53 | if (usize != vsize) |
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54 | return usize - vsize; |
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55 | |
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56 | if (usize == 0) |
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57 | return 0; |
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58 | |
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59 | u_digit = u->_mp_d[0]; |
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60 | |
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61 | if (u_digit == (mp_limb_t) (unsigned long) v_digit) |
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62 | return 0; |
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63 | |
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64 | if (u_digit > (mp_limb_t) (unsigned long) v_digit) |
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65 | return usize; |
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66 | else |
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67 | return -usize; |
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68 | } |
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