Annotation of OpenXM_contrib/gmp/mpq/cmp_ui.c, Revision 1.1.1.3
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:
1.1.1.3 ! ohara 5: Copyright 1993, 1994, 1996, 2000, 2001, 2002 Free Software Foundation, Inc.
1.1 maekawa 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
1.1.1.2 maekawa 28: _mpq_cmp_ui (const MP_RAT *op1, unsigned long int num2, unsigned long int den2)
1.1 maekawa 29: {
30: mp_size_t num1_size = op1->_mp_num._mp_size;
31: mp_size_t den1_size = op1->_mp_den._mp_size;
32: mp_size_t tmp1_size, tmp2_size;
33: mp_ptr tmp1_ptr, tmp2_ptr;
34: mp_limb_t cy_limb;
35: int cc;
36: TMP_DECL (marker);
37:
1.1.1.3 ! ohara 38: #if GMP_NAIL_BITS != 0
! 39: if ((num2 | den2) > GMP_NUMB_MAX)
! 40: {
! 41: mpq_t op2;
! 42: mpq_init (op2);
! 43: mpz_set_ui (mpq_numref (op2), num2);
! 44: mpz_set_ui (mpq_denref (op2), den2);
! 45: cc = mpq_cmp (op1, op2);
! 46: mpq_clear (op2);
! 47: return cc;
! 48: }
! 49: #endif
! 50:
! 51: /* need canonical sign to get right result */
! 52: ASSERT (den1_size > 0);
! 53:
! 54: if (den2 == 0)
! 55: DIVIDE_BY_ZERO;
! 56:
1.1 maekawa 57: if (num1_size == 0)
58: return -(num2 != 0);
59: if (num1_size < 0)
60: return num1_size;
61: if (num2 == 0)
62: return num1_size;
63:
64: /* NUM1 x DEN2 is either TMP1_SIZE limbs or TMP1_SIZE-1 limbs.
65: Same for NUM1 x DEN1 with respect to TMP2_SIZE. */
66: if (num1_size > den1_size + 1)
67: /* NUM1 x DEN2 is surely larger in magnitude than NUM2 x DEN1. */
1.1.1.3 ! ohara 68: return num1_size;
! 69: if (den1_size > num1_size + 1)
1.1 maekawa 70: /* NUM1 x DEN2 is surely smaller in magnitude than NUM2 x DEN1. */
1.1.1.3 ! ohara 71: return -num1_size;
1.1 maekawa 72:
73: TMP_MARK (marker);
74: tmp1_ptr = (mp_ptr) TMP_ALLOC ((num1_size + 1) * BYTES_PER_MP_LIMB);
75: tmp2_ptr = (mp_ptr) TMP_ALLOC ((den1_size + 1) * BYTES_PER_MP_LIMB);
76:
77: cy_limb = mpn_mul_1 (tmp1_ptr, op1->_mp_num._mp_d, num1_size, den2);
78: tmp1_ptr[num1_size] = cy_limb;
79: tmp1_size = num1_size + (cy_limb != 0);
80:
81: cy_limb = mpn_mul_1 (tmp2_ptr, op1->_mp_den._mp_d, den1_size, num2);
82: tmp2_ptr[den1_size] = cy_limb;
83: tmp2_size = den1_size + (cy_limb != 0);
84:
85: cc = tmp1_size - tmp2_size != 0
86: ? tmp1_size - tmp2_size : mpn_cmp (tmp1_ptr, tmp2_ptr, tmp1_size);
87: TMP_FREE (marker);
1.1.1.3 ! ohara 88: return cc;
1.1 maekawa 89: }
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