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Annotation of OpenXM/src/kan96xx/gmp-2.0.2/mpq/cmp_ui.c, Revision 1.1

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
        !            10: it under the terms of the GNU Library General Public License as published by
        !            11: the Free Software Foundation; either version 2 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 Library General Public
        !            17: License for more details.
        !            18:
        !            19: You should have received a copy of the GNU Library General Public License
        !            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: /* gmp.h defines a macro for mpq_cmp_ui.  */
        !            28: #undef mpq_cmp_ui
        !            29:
        !            30: int
        !            31: #if __STDC__
        !            32: mpq_cmp_ui (const MP_RAT *op1, unsigned long int num2, unsigned long int den2)
        !            33: #else
        !            34: mpq_cmp_ui (op1, num2, den2)
        !            35:      const MP_RAT *op1;
        !            36:      unsigned long int num2;
        !            37:      unsigned long int den2;
        !            38: #endif
        !            39: {
        !            40:   mp_size_t num1_size = op1->_mp_num._mp_size;
        !            41:   mp_size_t den1_size = op1->_mp_den._mp_size;
        !            42:   mp_size_t tmp1_size, tmp2_size;
        !            43:   mp_ptr tmp1_ptr, tmp2_ptr;
        !            44:   mp_size_t num1_sign;
        !            45:   mp_limb_t cy_limb;
        !            46:   int cc;
        !            47:   TMP_DECL (marker);
        !            48:
        !            49:   if (num1_size == 0)
        !            50:     return -(num2 != 0);
        !            51:   if (num1_size < 0)
        !            52:     return num1_size;
        !            53:   if (num2 == 0)
        !            54:     return num1_size;
        !            55:
        !            56:   num1_sign = num1_size;
        !            57:   num1_size = ABS (num1_size);
        !            58:
        !            59:   /* NUM1 x DEN2 is either TMP1_SIZE limbs or TMP1_SIZE-1 limbs.
        !            60:      Same for NUM1 x DEN1 with respect to TMP2_SIZE.  */
        !            61:   if (num1_size > den1_size + 1)
        !            62:     /* NUM1 x DEN2 is surely larger in magnitude than NUM2 x DEN1.  */
        !            63:     return num1_sign;
        !            64:   if (den1_size > num1_sign + 1)
        !            65:     /* NUM1 x DEN2 is surely smaller in magnitude than NUM2 x DEN1.  */
        !            66:     return -num1_sign;
        !            67:
        !            68:   TMP_MARK (marker);
        !            69:   tmp1_ptr = (mp_ptr) TMP_ALLOC ((num1_size + 1) * BYTES_PER_MP_LIMB);
        !            70:   tmp2_ptr = (mp_ptr) TMP_ALLOC ((den1_size + 1) * BYTES_PER_MP_LIMB);
        !            71:
        !            72:   cy_limb = mpn_mul_1 (tmp1_ptr, op1->_mp_num._mp_d, num1_size, den2);
        !            73:   tmp1_ptr[num1_size] = cy_limb;
        !            74:   tmp1_size = num1_size + (cy_limb != 0);
        !            75:
        !            76:   cy_limb = mpn_mul_1 (tmp2_ptr, op1->_mp_den._mp_d, den1_size, num2);
        !            77:   tmp2_ptr[den1_size] = cy_limb;
        !            78:   tmp2_size = den1_size + (cy_limb != 0);
        !            79:
        !            80:   cc = tmp1_size - tmp2_size != 0
        !            81:     ? tmp1_size - tmp2_size : mpn_cmp (tmp1_ptr, tmp2_ptr, tmp1_size);
        !            82:   TMP_FREE (marker);
        !            83:   return (num1_sign < 0) ? -cc : cc;
        !            84: }