1 /* mpz_tdiv_qr_ui(quot,rem,dividend,short_divisor) --
2 Set QUOT to DIVIDEND / SHORT_DIVISOR
3 and REM to DIVIDEND mod SHORT_DIVISOR.
5 Copyright 1991, 1993, 1994, 1996, 1998, 2001, 2002, 2004 Free Software
8 This file is part of the GNU MP Library.
10 The GNU MP Library is free software; you can redistribute it and/or modify
11 it under the terms of the GNU Lesser General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or (at your
13 option) any later version.
15 The GNU MP Library is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
18 License for more details.
20 You should have received a copy of the GNU Lesser General Public License
21 along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
27 mpz_tdiv_qr_ui (mpz_ptr quot
, mpz_ptr rem
, mpz_srcptr dividend
, unsigned long int divisor
)
45 MPZ_REALLOC (quot
, nn
);
49 #if BITS_PER_ULONG > GMP_NUMB_BITS /* avoid warnings about shift amount */
50 if (divisor
> GMP_NUMB_MAX
)
56 if (nn
== 1) /* tdiv_qr requirements; tested above for 0 */
60 SIZ(rem
) = ns
>= 0 ? 1 : -1;
68 dp
[0] = divisor
& GMP_NUMB_MASK
;
69 dp
[1] = divisor
>> GMP_NUMB_BITS
;
70 mpn_tdiv_qr (qp
, rp
, (mp_size_t
) 0, np
, nn
, dp
, (mp_size_t
) 2);
71 rl
= rp
[0] + (rp
[1] << GMP_NUMB_BITS
);
72 qn
= nn
- 2 + 1; qn
-= qp
[qn
- 1] == 0; qn
-= qn
!= 0 && qp
[qn
- 1] == 0;
73 rn
= 2 - (rp
[1] == 0); rn
-= (rp
[rn
- 1] == 0);
74 SIZ(rem
) = ns
>= 0 ? rn
: -rn
;
79 rl
= mpn_divrem_1 (qp
, (mp_size_t
) 0, np
, nn
, (mp_limb_t
) divisor
);
84 /* Store the single-limb remainder. We don't check if there's space
85 for just one limb, since no function ever makes zero space. */
86 SIZ(rem
) = ns
>= 0 ? 1 : -1;
89 qn
= nn
- (qp
[nn
- 1] == 0);
92 SIZ(quot
) = ns
>= 0 ? qn
: -qn
;