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author | tege <tege@gmplib.org> | 1996-05-08 09:10:48 +0200 |
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committer | tege <tege@gmplib.org> | 1996-05-08 09:10:48 +0200 |
commit | c6d715868f53b08c62a129ffd77fb585fd89c43b (patch) | |
tree | 82f36d2d8cbe7e07ad3e18d5c6e047e8796d861e /mpz/fdiv_qr.c | |
download | gmp-c6d715868f53b08c62a129ffd77fb585fd89c43b.tar.gz |
Initial revision
Diffstat (limited to 'mpz/fdiv_qr.c')
-rw-r--r-- | mpz/fdiv_qr.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/mpz/fdiv_qr.c b/mpz/fdiv_qr.c new file mode 100644 index 000000000..2abb16ccb --- /dev/null +++ b/mpz/fdiv_qr.c @@ -0,0 +1,62 @@ +/* mpz_fdiv_qr -- Division rounding the quotient towards -infinity. + The remainder gets the same sign as the denominator. + +Copyright (C) 1994, 1995, 1996 Free Software Foundation, Inc. + +This file is part of the GNU MP Library. + +The GNU MP Library is free software; you can redistribute it and/or modify +it under the terms of the GNU Library General Public License as published by +the Free Software Foundation; either version 2 of the License, or (at your +option) any later version. + +The GNU MP Library is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY +or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public +License for more details. + +You should have received a copy of the GNU Library General Public License +along with the GNU MP Library; see the file COPYING.LIB. If not, write to +the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, +MA 02111-1307, USA. */ + +#include "gmp.h" +#include "gmp-impl.h" + +void +#if __STDC__ +mpz_fdiv_qr (mpz_ptr quot, mpz_ptr rem, mpz_srcptr dividend, mpz_srcptr divisor) +#else +mpz_fdiv_qr (quot, rem, dividend, divisor) + mpz_ptr quot; + mpz_ptr rem; + mpz_srcptr dividend; + mpz_srcptr divisor; +#endif +{ + mp_size_t divisor_size = divisor->_mp_size; + mpz_t temp_divisor; /* N.B.: lives until function returns! */ + TMP_DECL (marker); + + TMP_MARK (marker); + + /* We need the original value of the divisor after the quotient and + remainder have been preliminary calculated. We have to copy it to + temporary space if it's the same variable as either QUOT or REM. */ + if (quot == divisor || rem == divisor) + { + MPZ_TMP_INIT (temp_divisor, ABS (divisor_size)); + mpz_set (temp_divisor, divisor); + divisor = temp_divisor; + } + + mpz_tdiv_qr (quot, rem, dividend, divisor); + + if ((divisor_size ^ dividend->_mp_size) < 0 && rem->_mp_size != 0) + { + mpz_sub_ui (quot, quot, 1L); + mpz_add (rem, rem, divisor); + } + + TMP_FREE (marker); +} |