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Annotation of OpenXM_contrib/gmp/mpz/fdiv_qr.c, Revision 1.1

1.1     ! maekawa     1: /* mpz_fdiv_qr -- Division rounding the quotient towards -infinity.
        !             2:    The remainder gets the same sign as the denominator.
        !             3:
        !             4: Copyright (C) 1994, 1995, 1996 Free Software Foundation, Inc.
        !             5:
        !             6: This file is part of the GNU MP Library.
        !             7:
        !             8: The GNU MP Library is free software; you can redistribute it and/or modify
        !             9: it under the terms of the GNU Library General Public License as published by
        !            10: the Free Software Foundation; either version 2 of the License, or (at your
        !            11: option) any later version.
        !            12:
        !            13: The GNU MP Library is distributed in the hope that it will be useful, but
        !            14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            16: License for more details.
        !            17:
        !            18: You should have received a copy of the GNU Library General Public License
        !            19: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            21: MA 02111-1307, USA. */
        !            22:
        !            23: #include "gmp.h"
        !            24: #include "gmp-impl.h"
        !            25:
        !            26: void
        !            27: #if __STDC__
        !            28: mpz_fdiv_qr (mpz_ptr quot, mpz_ptr rem, mpz_srcptr dividend, mpz_srcptr divisor)
        !            29: #else
        !            30: mpz_fdiv_qr (quot, rem, dividend, divisor)
        !            31:      mpz_ptr quot;
        !            32:      mpz_ptr rem;
        !            33:      mpz_srcptr dividend;
        !            34:      mpz_srcptr divisor;
        !            35: #endif
        !            36: {
        !            37:   mp_size_t divisor_size = divisor->_mp_size;
        !            38:   mpz_t temp_divisor;          /* N.B.: lives until function returns! */
        !            39:   TMP_DECL (marker);
        !            40:
        !            41:   TMP_MARK (marker);
        !            42:
        !            43:   /* We need the original value of the divisor after the quotient and
        !            44:      remainder have been preliminary calculated.  We have to copy it to
        !            45:      temporary space if it's the same variable as either QUOT or REM.  */
        !            46:   if (quot == divisor || rem == divisor)
        !            47:     {
        !            48:       MPZ_TMP_INIT (temp_divisor, ABS (divisor_size));
        !            49:       mpz_set (temp_divisor, divisor);
        !            50:       divisor = temp_divisor;
        !            51:     }
        !            52:
        !            53:   mpz_tdiv_qr (quot, rem, dividend, divisor);
        !            54:
        !            55:   if ((divisor_size ^ dividend->_mp_size) < 0 && rem->_mp_size != 0)
        !            56:     {
        !            57:       mpz_sub_ui (quot, quot, 1L);
        !            58:       mpz_add (rem, rem, divisor);
        !            59:     }
        !            60:
        !            61:   TMP_FREE (marker);
        !            62: }