| 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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