1 /* mpz_rootrem(root, rem, u, nth) -- Set ROOT to floor(U^(1/nth)) and
2 set REM to the remainder.
4 Copyright 1999, 2000, 2001, 2002, 2003, 2005 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/. */
21 #include <stdio.h> /* for NULL */
26 mpz_rootrem (mpz_ptr root
, mpz_ptr rem
, mpz_srcptr u
, unsigned long int nth
)
28 mp_ptr rootp
, up
, remp
;
29 mp_size_t us
, un
, rootn
, remn
;
34 /* even roots of negatives provoke an exception */
35 if (us
< 0 && (nth
& 1) == 0)
38 /* root extraction interpreted as c^(1/nth) means a zeroth root should
39 provoke a divide by zero, do this even if c==0 */
52 rootn
= (un
- 1) / nth
+ 1;
56 /* FIXME: Perhaps disallow root == NULL */
57 if (root
!= NULL
&& u
!= root
)
58 rootp
= MPZ_REALLOC (root
, rootn
);
60 rootp
= TMP_ALLOC_LIMBS (rootn
);
63 remp
= MPZ_REALLOC (rem
, un
);
65 remp
= TMP_ALLOC_LIMBS (un
);
71 MPN_COPY (rootp
, up
, un
);
76 remn
= mpn_rootrem (rootp
, remp
, up
, un
, (mp_limb_t
) nth
);
81 SIZ(root
) = us
>= 0 ? rootn
: -rootn
;
83 MPN_COPY (up
, rootp
, rootn
);
85 MPN_COPY (up
, remp
, remn
);