+++ /dev/null
-/* mpz_xor -- Logical xor.
-
-Copyright (C) 1991, 1993, 1994, 1996, 1997, 2000 Free Software Foundation,
-Inc.
-
-This file is part of the GNU MP Library.
-
-The GNU MP Library is free software; you can redistribute it and/or modify
-it under the terms of the GNU Lesser General Public License as published by
-the Free Software Foundation; either version 2.1 of the License, or (at your
-option) any later version.
-
-The GNU MP Library is distributed in the hope that it will be useful, but
-WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
-or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
-License for more details.
-
-You should have received a copy of the GNU Lesser General Public License
-along with the GNU MP Library; see the file COPYING.LIB. If not, write to
-the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
-MA 02111-1307, USA. */
-
-#include "gmp.h"
-#include "gmp-impl.h"
-
-void
-#if __STDC__
-mpz_xor (mpz_ptr res, mpz_srcptr op1, mpz_srcptr op2)
-#else
-mpz_xor (res, op1, op2)
- mpz_ptr res;
- mpz_srcptr op1;
- mpz_srcptr op2;
-#endif
-{
- mp_srcptr op1_ptr, op2_ptr;
- mp_size_t op1_size, op2_size;
- mp_ptr res_ptr;
- mp_size_t res_size, res_alloc;
- mp_size_t i;
- TMP_DECL (marker);
-
- TMP_MARK (marker);
- op1_size = op1->_mp_size;
- op2_size = op2->_mp_size;
-
- op1_ptr = op1->_mp_d;
- op2_ptr = op2->_mp_d;
- res_ptr = res->_mp_d;
-
- if (op1_size >= 0)
- {
- if (op2_size >= 0)
- {
- if (op1_size >= op2_size)
- {
- if (res->_mp_alloc < op1_size)
- {
- _mpz_realloc (res, op1_size);
- op1_ptr = op1->_mp_d;
- op2_ptr = op2->_mp_d;
- res_ptr = res->_mp_d;
- }
-
- if (res_ptr != op1_ptr)
- MPN_COPY (res_ptr + op2_size, op1_ptr + op2_size,
- op1_size - op2_size);
- for (i = op2_size - 1; i >= 0; i--)
- res_ptr[i] = op1_ptr[i] ^ op2_ptr[i];
- res_size = op1_size;
- }
- else
- {
- if (res->_mp_alloc < op2_size)
- {
- _mpz_realloc (res, op2_size);
- op1_ptr = op1->_mp_d;
- op2_ptr = op2->_mp_d;
- res_ptr = res->_mp_d;
- }
-
- if (res_ptr != op2_ptr)
- MPN_COPY (res_ptr + op1_size, op2_ptr + op1_size,
- op2_size - op1_size);
- for (i = op1_size - 1; i >= 0; i--)
- res_ptr[i] = op1_ptr[i] ^ op2_ptr[i];
- res_size = op2_size;
- }
-
- MPN_NORMALIZE (res_ptr, res_size);
- res->_mp_size = res_size;
- return;
- }
- else /* op2_size < 0 */
- {
- /* Fall through to the code at the end of the function. */
- }
- }
- else
- {
- if (op2_size < 0)
- {
- mp_ptr opx;
- mp_limb_t cy;
-
- /* Both operands are negative, the result will be positive.
- (-OP1) ^ (-OP2) =
- = ~(OP1 - 1) ^ ~(OP2 - 1) =
- = (OP1 - 1) ^ (OP2 - 1) */
-
- op1_size = -op1_size;
- op2_size = -op2_size;
-
- /* Possible optimization: Decrease mpn_sub precision,
- as we won't use the entire res of both. */
- opx = (mp_ptr) TMP_ALLOC (op1_size * BYTES_PER_MP_LIMB);
- mpn_sub_1 (opx, op1_ptr, op1_size, (mp_limb_t) 1);
- op1_ptr = opx;
-
- opx = (mp_ptr) TMP_ALLOC (op2_size * BYTES_PER_MP_LIMB);
- mpn_sub_1 (opx, op2_ptr, op2_size, (mp_limb_t) 1);
- op2_ptr = opx;
-
- res_alloc = MAX (op1_size, op2_size);
- if (res->_mp_alloc < res_alloc)
- {
- _mpz_realloc (res, res_alloc);
- res_ptr = res->_mp_d;
- /* Don't re-read OP1_PTR and OP2_PTR. They point to
- temporary space--never to the space RES->_mp_d used
- to point to before reallocation. */
- }
-
- if (op1_size > op2_size)
- {
- MPN_COPY (res_ptr + op2_size, op1_ptr + op2_size,
- op1_size - op2_size);
- for (i = op2_size - 1; i >= 0; i--)
- res_ptr[i] = op1_ptr[i] ^ op2_ptr[i];
- res_size = op1_size;
- }
- else
- {
- MPN_COPY (res_ptr + op1_size, op2_ptr + op1_size,
- op2_size - op1_size);
- for (i = op1_size - 1; i >= 0; i--)
- res_ptr[i] = op1_ptr[i] ^ op2_ptr[i];
- res_size = op2_size;
- }
-
- MPN_NORMALIZE (res_ptr, res_size);
- res->_mp_size = res_size;
- TMP_FREE (marker);
- return;
- }
- else
- {
- /* We should compute -OP1 ^ OP2. Swap OP1 and OP2 and fall
- through to the code that handles OP1 ^ -OP2. */
- MPZ_SRCPTR_SWAP (op1, op2);
- MPN_SRCPTR_SWAP (op1_ptr,op1_size, op2_ptr,op2_size);
- }
- }
-
- {
- mp_ptr opx;
- mp_limb_t cy;
- mp_size_t count;
-
- /* Operand 2 negative, so will be the result.
- -(OP1 ^ (-OP2)) = -(OP1 ^ ~(OP2 - 1)) =
- = ~(OP1 ^ ~(OP2 - 1)) + 1 =
- = (OP1 ^ (OP2 - 1)) + 1 */
-
- op2_size = -op2_size;
-
- opx = (mp_ptr) TMP_ALLOC (op2_size * BYTES_PER_MP_LIMB);
- mpn_sub_1 (opx, op2_ptr, op2_size, (mp_limb_t) 1);
- op2_ptr = opx;
-
- res_alloc = MAX (op1_size, op2_size) + 1;
- if (res->_mp_alloc < res_alloc)
- {
- _mpz_realloc (res, res_alloc);
- op1_ptr = op1->_mp_d;
- res_ptr = res->_mp_d;
- /* Don't re-read OP2_PTR. It points to temporary space--never
- to the space RES->_mp_d used to point to before reallocation. */
- }
-
- if (op1_size > op2_size)
- {
- MPN_COPY (res_ptr + op2_size, op1_ptr + op2_size, op1_size - op2_size);
- for (i = op2_size - 1; i >= 0; i--)
- res_ptr[i] = op1_ptr[i] ^ op2_ptr[i];
- res_size = op1_size;
- }
- else
- {
- MPN_COPY (res_ptr + op1_size, op2_ptr + op1_size, op2_size - op1_size);
- for (i = op1_size - 1; i >= 0; i--)
- res_ptr[i] = op1_ptr[i] ^ op2_ptr[i];
- res_size = op2_size;
- }
-
- cy = mpn_add_1 (res_ptr, res_ptr, res_size, (mp_limb_t) 1);
- if (cy)
- {
- res_ptr[res_size] = cy;
- res_size++;
- }
-
- MPN_NORMALIZE (res_ptr, res_size);
- res->_mp_size = -res_size;
- TMP_FREE (marker);
- }
-}
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