Annotation of OpenXM_contrib/gmp/mpz/sqrtrem.c, Revision 1.1.1.2
1.1 maekawa 1: /* mpz_sqrtrem(root,rem,x) -- Set ROOT to floor(sqrt(X)) and REM
2: to the remainder, i.e. X - ROOT**2.
3:
1.1.1.2 ! maekawa 4: Copyright (C) 1991, 1993, 1994, 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:
1.1.1.2 ! maekawa 23: #include <stdio.h> /* for NULL */
1.1 maekawa 24: #include "gmp.h"
25: #include "gmp-impl.h"
1.1.1.2 ! maekawa 26: #ifdef BERKELEY_MP
! 27: #include "mp.h"
! 28: #endif
1.1 maekawa 29:
30: #ifndef BERKELEY_MP
31: void
32: #if __STDC__
33: mpz_sqrtrem (mpz_ptr root, mpz_ptr rem, mpz_srcptr op)
34: #else
35: mpz_sqrtrem (root, rem, op)
36: mpz_ptr root;
37: mpz_ptr rem;
38: mpz_srcptr op;
39: #endif
40: #else /* BERKELEY_MP */
41: void
42: #if __STDC__
43: msqrt (mpz_srcptr op, mpz_ptr root, mpz_ptr rem)
44: #else
45: msqrt (op, root, rem)
46: mpz_srcptr op;
47: mpz_ptr root;
48: mpz_ptr rem;
49: #endif
50: #endif /* BERKELEY_MP */
51: {
52: mp_size_t op_size, root_size, rem_size;
53: mp_ptr root_ptr, op_ptr;
54: mp_ptr free_me = NULL;
55: mp_size_t free_me_size;
56: TMP_DECL (marker);
57:
58: TMP_MARK (marker);
59: op_size = op->_mp_size;
60: if (op_size < 0)
1.1.1.2 ! maekawa 61: SQRT_OF_NEGATIVE;
1.1 maekawa 62:
63: if (rem->_mp_alloc < op_size)
64: _mpz_realloc (rem, op_size);
65:
66: /* The size of the root is accurate after this simple calculation. */
67: root_size = (op_size + 1) / 2;
68:
69: root_ptr = root->_mp_d;
70: op_ptr = op->_mp_d;
71:
72: if (root->_mp_alloc < root_size)
73: {
74: if (root_ptr == op_ptr)
75: {
76: free_me = root_ptr;
77: free_me_size = root->_mp_alloc;
78: }
79: else
80: (*_mp_free_func) (root_ptr, root->_mp_alloc * BYTES_PER_MP_LIMB);
81:
82: root->_mp_alloc = root_size;
83: root_ptr = (mp_ptr) (*_mp_allocate_func) (root_size * BYTES_PER_MP_LIMB);
84: root->_mp_d = root_ptr;
85: }
86: else
87: {
88: /* Make OP not overlap with ROOT. */
89: if (root_ptr == op_ptr)
90: {
91: /* ROOT and OP are identical. Allocate temporary space for OP. */
92: op_ptr = (mp_ptr) TMP_ALLOC (op_size * BYTES_PER_MP_LIMB);
93: /* Copy to the temporary space. Hack: Avoid temporary variable
94: by using ROOT_PTR. */
95: MPN_COPY (op_ptr, root_ptr, op_size);
96: }
97: }
98:
99: rem_size = mpn_sqrtrem (root_ptr, rem->_mp_d, op_ptr, op_size);
100:
101: root->_mp_size = root_size;
102:
103: /* Write remainder size last, to enable us to define this function to
104: give only the square root remainder, if the user calls if with
105: ROOT == REM. */
106: rem->_mp_size = rem_size;
107:
108: if (free_me != NULL)
109: (*_mp_free_func) (free_me, free_me_size * BYTES_PER_MP_LIMB);
110: TMP_FREE (marker);
111: }
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>