Annotation of OpenXM_contrib/gmp/mpz/aors.h, Revision 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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