77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/* mpq_cmp(u,v) -- Compare U, V. Return positive, zero, or negative
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based on if U > V, U == V, or U < V.
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Copyright (C) 1991 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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The GNU MP Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the GNU MP Library; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "gmp.h"
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#include "gmp-impl.h"
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int
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#ifdef __STDC__
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mpq_cmp (const MP_RAT *op1, const MP_RAT *op2)
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#else
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mpq_cmp (op1, op2)
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const MP_RAT *op1;
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const MP_RAT *op2;
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#endif
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{
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mp_size num1_size = op1->num.size;
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mp_size den1_size = op1->den.size;
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mp_size num2_size = op2->num.size;
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mp_size den2_size = op2->den.size;
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mp_size tmp1_size, tmp2_size;
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mp_ptr tmp1_ptr, tmp2_ptr;
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mp_size num1_sign;
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int cc;
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if (num1_size == 0)
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return -num2_size;
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if (num2_size == 0)
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return num1_size;
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if ((num1_size ^ num2_size) < 0) /* I.e. are the signs different? */
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return num1_size;
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num1_sign = num1_size;
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num1_size = ABS (num1_size);
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num2_size = ABS (num2_size);
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tmp1_size = num1_size + den2_size;
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tmp2_size = num2_size + den1_size;
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if (tmp1_size != tmp2_size)
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return (tmp1_size - tmp2_size) ^ num1_sign;
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tmp1_ptr = (mp_ptr) alloca (tmp1_size * BYTES_PER_MP_LIMB);
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tmp2_ptr = (mp_ptr) alloca (tmp2_size * BYTES_PER_MP_LIMB);
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tmp1_size = (num1_size >= den2_size)
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? mpn_mul (tmp1_ptr, op1->num.d, num1_size, op2->den.d, den2_size)
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: mpn_mul (tmp1_ptr, op2->den.d, den2_size, op1->num.d, num1_size);
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tmp2_size = (num2_size >= den1_size)
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? mpn_mul (tmp2_ptr, op2->num.d, num2_size, op1->den.d, den1_size)
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: mpn_mul (tmp2_ptr, op1->den.d, den1_size, op2->num.d, num2_size);
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cc = tmp1_size - tmp2_size != 0
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? tmp1_size - tmp2_size : mpn_cmp (tmp1_ptr, tmp2_ptr, tmp1_size);
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alloca (0);
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return (num1_sign < 0) ? -cc : cc;
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}
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