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Annotation of OpenXM_contrib/gmp/mpz/fdiv_qr.c, Revision 1.1.1.2

1.1       maekawa     1: /* mpz_fdiv_qr -- Division rounding the quotient towards -infinity.
                      2:    The remainder gets the same sign as the denominator.
                      3:
1.1.1.2 ! maekawa     4: Copyright (C) 1994, 1995, 1996, 2000 Free Software Foundation, Inc.
1.1       maekawa     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
1.1.1.2 ! maekawa     9: it under the terms of the GNU Lesser General Public License as published by
        !            10: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1       maekawa    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
1.1.1.2 ! maekawa    15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
1.1       maekawa    16: License for more details.
                     17:
1.1.1.2 ! maekawa    18: You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    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;
1.1.1.2 ! maekawa    38:   mp_size_t xsize;
1.1       maekawa    39:   mpz_t temp_divisor;          /* N.B.: lives until function returns! */
                     40:   TMP_DECL (marker);
                     41:
                     42:   TMP_MARK (marker);
                     43:
                     44:   /* We need the original value of the divisor after the quotient and
                     45:      remainder have been preliminary calculated.  We have to copy it to
                     46:      temporary space if it's the same variable as either QUOT or REM.  */
                     47:   if (quot == divisor || rem == divisor)
                     48:     {
                     49:       MPZ_TMP_INIT (temp_divisor, ABS (divisor_size));
                     50:       mpz_set (temp_divisor, divisor);
                     51:       divisor = temp_divisor;
                     52:     }
                     53:
1.1.1.2 ! maekawa    54:   xsize = dividend->_mp_size ^ divisor_size;;
1.1       maekawa    55:   mpz_tdiv_qr (quot, rem, dividend, divisor);
                     56:
1.1.1.2 ! maekawa    57:   if (xsize < 0 && rem->_mp_size != 0)
1.1       maekawa    58:     {
                     59:       mpz_sub_ui (quot, quot, 1L);
                     60:       mpz_add (rem, rem, divisor);
                     61:     }
                     62:
                     63:   TMP_FREE (marker);
                     64: }