Annotation of OpenXM_contrib/gmp/mpq/cmp_ui.c, Revision 1.1.1.2
1.1 maekawa 1: /* mpq_cmp_ui(u,vn,vd) -- Compare U with Vn/Vd. Return positive, zero, or
2: negative based on if U > V, U == V, or U < V. Vn and Vd may have
3: common factors.
4:
5: Copyright (C) 1993, 1994, 1996 Free Software 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
1.1.1.2 ! maekawa 10: it under the terms of the GNU Lesser General Public License as published by
! 11: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1 maekawa 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
1.1.1.2 ! maekawa 16: or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
1.1 maekawa 17: License for more details.
18:
1.1.1.2 ! maekawa 19: You should have received a copy of the GNU Lesser General Public License
1.1 maekawa 20: along with the GNU MP Library; see the file COPYING.LIB. If not, write to
21: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22: MA 02111-1307, USA. */
23:
24: #include "gmp.h"
25: #include "gmp-impl.h"
26:
27: int
28: #if __STDC__
1.1.1.2 ! maekawa 29: _mpq_cmp_ui (const MP_RAT *op1, unsigned long int num2, unsigned long int den2)
1.1 maekawa 30: #else
1.1.1.2 ! maekawa 31: _mpq_cmp_ui (op1, num2, den2)
1.1 maekawa 32: const MP_RAT *op1;
33: unsigned long int num2;
34: unsigned long int den2;
35: #endif
36: {
37: mp_size_t num1_size = op1->_mp_num._mp_size;
38: mp_size_t den1_size = op1->_mp_den._mp_size;
39: mp_size_t tmp1_size, tmp2_size;
40: mp_ptr tmp1_ptr, tmp2_ptr;
41: mp_size_t num1_sign;
42: mp_limb_t cy_limb;
43: int cc;
44: TMP_DECL (marker);
45:
46: if (num1_size == 0)
47: return -(num2 != 0);
48: if (num1_size < 0)
49: return num1_size;
50: if (num2 == 0)
51: return num1_size;
52:
53: num1_sign = num1_size;
54: num1_size = ABS (num1_size);
55:
56: /* NUM1 x DEN2 is either TMP1_SIZE limbs or TMP1_SIZE-1 limbs.
57: Same for NUM1 x DEN1 with respect to TMP2_SIZE. */
58: if (num1_size > den1_size + 1)
59: /* NUM1 x DEN2 is surely larger in magnitude than NUM2 x DEN1. */
60: return num1_sign;
61: if (den1_size > num1_sign + 1)
62: /* NUM1 x DEN2 is surely smaller in magnitude than NUM2 x DEN1. */
63: return -num1_sign;
64:
65: TMP_MARK (marker);
66: tmp1_ptr = (mp_ptr) TMP_ALLOC ((num1_size + 1) * BYTES_PER_MP_LIMB);
67: tmp2_ptr = (mp_ptr) TMP_ALLOC ((den1_size + 1) * BYTES_PER_MP_LIMB);
68:
69: cy_limb = mpn_mul_1 (tmp1_ptr, op1->_mp_num._mp_d, num1_size, den2);
70: tmp1_ptr[num1_size] = cy_limb;
71: tmp1_size = num1_size + (cy_limb != 0);
72:
73: cy_limb = mpn_mul_1 (tmp2_ptr, op1->_mp_den._mp_d, den1_size, num2);
74: tmp2_ptr[den1_size] = cy_limb;
75: tmp2_size = den1_size + (cy_limb != 0);
76:
77: cc = tmp1_size - tmp2_size != 0
78: ? tmp1_size - tmp2_size : mpn_cmp (tmp1_ptr, tmp2_ptr, tmp1_size);
79: TMP_FREE (marker);
80: return (num1_sign < 0) ? -cc : cc;
81: }
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