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ff4ff35918
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147 lines
3.8 KiB
C
147 lines
3.8 KiB
C
/* mpz_xor -- Logical xor.
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Copyright 1991, 1993, 1994, 1996, 1997, 2000, 2001, 2005, 2012,
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2015-2018 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any
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later version.
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or both in parallel, as here.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received copies of the GNU General Public License and the
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GNU Lesser General Public License along with the GNU MP Library. If not,
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see https://www.gnu.org/licenses/. */
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#include "gmp-impl.h"
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void
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mpz_xor (mpz_ptr res, mpz_srcptr op1, mpz_srcptr op2)
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{
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mp_srcptr op1_ptr, op2_ptr;
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mp_size_t op1_size, op2_size;
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mp_ptr res_ptr;
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mp_size_t res_size;
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op1_size = SIZ(op1);
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op2_size = SIZ(op2);
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if (op1_size < op2_size)
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{
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MPZ_SRCPTR_SWAP (op1, op2);
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MP_SIZE_T_SWAP (op1_size, op2_size);
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}
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op1_ptr = PTR(op1);
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res_ptr = PTR(res);
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if (op2_size >= 0)
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{
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if (res_ptr != op1_ptr)
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{
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res_ptr = MPZ_REALLOC (res, op1_size);
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MPN_COPY (res_ptr + op2_size, op1_ptr + op2_size,
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op1_size - op2_size);
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}
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if (LIKELY (op2_size != 0))
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mpn_xor_n (res_ptr, op1_ptr, PTR(op2), op2_size);
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res_size = op1_size;
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MPN_NORMALIZE (res_ptr, res_size);
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SIZ(res) = res_size;
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}
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else
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{
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mp_ptr opx;
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TMP_DECL;
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op2_size = -op2_size;
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TMP_MARK;
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if (op1_size < 0)
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{
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mp_ptr opy;
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/* Both operands are negative, the result will be positive.
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(-OP1) ^ (-OP2) =
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= ~(OP1 - 1) ^ ~(OP2 - 1) =
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= (OP1 - 1) ^ (OP2 - 1) */
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op1_size = -op1_size;
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/* Possible optimization: Decrease mpn_sub precision,
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as we won't use the entire res of both. */
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TMP_ALLOC_LIMBS_2 (opx, op1_size, opy, op2_size);
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mpn_sub_1 (opx, op1_ptr, op1_size, (mp_limb_t) 1);
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op1_ptr = opx;
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mpn_sub_1 (opy, PTR(op2), op2_size, (mp_limb_t) 1);
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op2_ptr = opy;
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res_ptr = MPZ_NEWALLOC (res, op2_size);
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/* Don't re-read OP1_PTR and OP2_PTR. They point to temporary
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space--never to the space PTR(res) used to point to before
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reallocation. */
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MPN_COPY (res_ptr + op1_size, op2_ptr + op1_size,
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op2_size - op1_size);
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mpn_xor_n (res_ptr, op1_ptr, op2_ptr, op1_size);
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TMP_FREE;
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res_size = op2_size;
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MPN_NORMALIZE (res_ptr, res_size);
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SIZ(res) = res_size;
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}
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else
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{
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/* Operand 2 negative, so will be the result.
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-(OP1 ^ (-OP2)) = -(OP1 ^ ~(OP2 - 1)) =
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= ~(OP1 ^ ~(OP2 - 1)) + 1 =
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= (OP1 ^ (OP2 - 1)) + 1 */
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res_size = MAX (op1_size, op2_size);
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res_ptr = MPZ_REALLOC (res, res_size + 1);
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op1_ptr = PTR(op1);
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opx = TMP_ALLOC_LIMBS (op2_size);
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mpn_sub_1 (opx, PTR(op2), op2_size, (mp_limb_t) 1);
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op2_ptr = opx;
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if (res_size == op1_size)
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{
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MPN_COPY (res_ptr + op2_size, op1_ptr + op2_size, op1_size - op2_size);
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mpn_xor_n (res_ptr, op1_ptr, op2_ptr, op2_size);
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}
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else
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{
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MPN_COPY (res_ptr + op1_size, op2_ptr + op1_size, op2_size - op1_size);
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if (LIKELY (op1_size != 0))
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mpn_xor_n (res_ptr, op1_ptr, op2_ptr, op1_size);
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}
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TMP_FREE;
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res_ptr[res_size] = 0;
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MPN_INCR_U (res_ptr, res_size + 1, (mp_limb_t) 1);
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res_size += res_ptr[res_size];
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MPN_NORMALIZE_NOT_ZERO (res_ptr, res_size);
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SIZ(res) = -res_size;
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}
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}
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}
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