Annotation of OpenXM_contrib/gmp/mpz/aors.h, Revision 1.1.1.1
1.1 ohara 1: /* mpz_add, mpz_sub -- add or subtract integers.
2:
3: Copyright 1991, 1993, 1994, 1996, 2000, 2001 Free Software Foundation, Inc.
4:
5: This file is part of the GNU MP Library.
6:
7: The GNU MP Library is free software; you can redistribute it and/or modify
8: it under the terms of the GNU Lesser General Public License as published by
9: the Free Software Foundation; either version 2.1 of the License, or (at your
10: option) any later version.
11:
12: The GNU MP Library is distributed in the hope that it will be useful, but
13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14: or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15: License for more details.
16:
17: You should have received a copy of the GNU Lesser General Public License
18: along with the GNU MP Library; see the file COPYING.LIB. If not, write to
19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20: MA 02111-1307, USA. */
21:
22: #include "gmp.h"
23: #include "gmp-impl.h"
24:
25:
26: #ifdef BERKELEY_MP
27:
28: #include "mp.h"
29: #ifdef OPERATION_add
30: #define FUNCTION madd
31: #define VARIATION
32: #endif
33: #ifdef OPERATION_sub
34: #define FUNCTION msub
35: #define VARIATION -
36: #endif
37: #define ARGUMENTS mpz_srcptr u, mpz_srcptr v, mpz_ptr w
38:
39: #else /* normal GMP */
40:
41: #ifdef OPERATION_add
42: #define FUNCTION mpz_add
43: #define VARIATION
44: #endif
45: #ifdef OPERATION_sub
46: #define FUNCTION mpz_sub
47: #define VARIATION -
48: #endif
49: #define ARGUMENTS mpz_ptr w, mpz_srcptr u, mpz_srcptr v
50:
51: #endif
52:
53: #ifndef FUNCTION
54: Error, need OPERATION_add or OPERATION_sub
55: #endif
56:
57:
58: void
59: FUNCTION (ARGUMENTS)
60: {
61: mp_srcptr up, vp;
62: mp_ptr wp;
63: mp_size_t usize, vsize, wsize;
64: mp_size_t abs_usize;
65: mp_size_t abs_vsize;
66:
67: usize = u->_mp_size;
68: vsize = VARIATION v->_mp_size;
69: abs_usize = ABS (usize);
70: abs_vsize = ABS (vsize);
71:
72: if (abs_usize < abs_vsize)
73: {
74: /* Swap U and V. */
75: MPZ_SRCPTR_SWAP (u, v);
76: MP_SIZE_T_SWAP (usize, vsize);
77: MP_SIZE_T_SWAP (abs_usize, abs_vsize);
78: }
79:
80: /* True: ABS_USIZE >= ABS_VSIZE. */
81:
82: /* If not space for w (and possible carry), increase space. */
83: wsize = abs_usize + 1;
84: if (w->_mp_alloc < wsize)
85: _mpz_realloc (w, wsize);
86:
87: /* These must be after realloc (u or v may be the same as w). */
88: up = u->_mp_d;
89: vp = v->_mp_d;
90: wp = w->_mp_d;
91:
92: if ((usize ^ vsize) < 0)
93: {
94: /* U and V have different sign. Need to compare them to determine
95: which operand to subtract from which. */
96:
97: /* This test is right since ABS_USIZE >= ABS_VSIZE. */
98: if (abs_usize != abs_vsize)
99: {
100: mpn_sub (wp, up, abs_usize, vp, abs_vsize);
101: wsize = abs_usize;
102: MPN_NORMALIZE (wp, wsize);
103: if (usize < 0)
104: wsize = -wsize;
105: }
106: else if (mpn_cmp (up, vp, abs_usize) < 0)
107: {
108: mpn_sub_n (wp, vp, up, abs_usize);
109: wsize = abs_usize;
110: MPN_NORMALIZE (wp, wsize);
111: if (usize >= 0)
112: wsize = -wsize;
113: }
114: else
115: {
116: mpn_sub_n (wp, up, vp, abs_usize);
117: wsize = abs_usize;
118: MPN_NORMALIZE (wp, wsize);
119: if (usize < 0)
120: wsize = -wsize;
121: }
122: }
123: else
124: {
125: /* U and V have same sign. Add them. */
126: mp_limb_t cy_limb = mpn_add (wp, up, abs_usize, vp, abs_vsize);
127: wp[abs_usize] = cy_limb;
128: wsize = abs_usize + cy_limb;
129: if (usize < 0)
130: wsize = -wsize;
131: }
132:
133: w->_mp_size = wsize;
134: }
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