1 /* mpz_tdiv_q_2exp -- Divide an integer by 2**CNT. Round the quotient
4 Copyright 1991, 1993, 1994, 1996, 2001, 2002 Free Software Foundation, Inc.
6 This file is part of the GNU MP Library.
8 The GNU MP Library is free software; you can redistribute it and/or modify
9 it under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or (at your
11 option) any later version.
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 Lesser General Public
16 License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
25 mpz_tdiv_q_2exp (mpz_ptr w
, mpz_srcptr u
, mp_bitcnt_t cnt
)
27 mp_size_t usize
, wsize
;
31 limb_cnt
= cnt
/ GMP_NUMB_BITS
;
32 wsize
= ABS (usize
) - limb_cnt
;
40 if (w
->_mp_alloc
< wsize
)
41 _mpz_realloc (w
, wsize
);
49 mpn_rshift (wp
, up
+ limb_cnt
, wsize
, cnt
);
50 wsize
-= wp
[wsize
- 1] == 0;
54 MPN_COPY_INCR (wp
, up
+ limb_cnt
, wsize
);
57 w
->_mp_size
= usize
>= 0 ? wsize
: -wsize
;