--- /dev/null
+/* mpz_ior -- Logical inclusive or.
+
+Copyright 1991, 1993, 1994, 1996, 1997, 2000, 2001, 2005 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 3 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. If not, see http://www.gnu.org/licenses/. */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+void
+mpz_ior (mpz_ptr res, mpz_srcptr op1, mpz_srcptr op2)
+{
+ mp_srcptr op1_ptr, op2_ptr;
+ mp_size_t op1_size, op2_size;
+ mp_ptr res_ptr;
+ mp_size_t res_size;
+ mp_size_t i;
+ TMP_DECL;
+
+ TMP_MARK;
+ op1_size = SIZ(op1);
+ op2_size = SIZ(op2);
+
+ op1_ptr = PTR(op1);
+ op2_ptr = PTR(op2);
+ res_ptr = PTR(res);
+
+ if (op1_size >= 0)
+ {
+ if (op2_size >= 0)
+ {
+ if (op1_size >= op2_size)
+ {
+ if (ALLOC(res) < op1_size)
+ {
+ _mpz_realloc (res, op1_size);
+ /* No overlapping possible: op1_ptr = PTR(op1); */
+ op2_ptr = PTR(op2);
+ res_ptr = PTR(res);
+ }
+
+ 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 (ALLOC(res) < op2_size)
+ {
+ _mpz_realloc (res, op2_size);
+ op1_ptr = PTR(op1);
+ /* No overlapping possible: op2_ptr = PTR(op2); */
+ res_ptr = PTR(res);
+ }
+
+ 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;
+ }
+
+ SIZ(res) = 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, so will be the result.
+ -((-OP1) | (-OP2)) = -(~(OP1 - 1) | ~(OP2 - 1)) =
+ = ~(~(OP1 - 1) | ~(OP2 - 1)) + 1 =
+ = ((OP1 - 1) & (OP2 - 1)) + 1 */
+
+ op1_size = -op1_size;
+ op2_size = -op2_size;
+
+ res_size = MIN (op1_size, op2_size);
+
+ /* Possible optimization: Decrease mpn_sub precision,
+ as we won't use the entire res of both. */
+ opx = TMP_ALLOC_LIMBS (res_size);
+ mpn_sub_1 (opx, op1_ptr, res_size, (mp_limb_t) 1);
+ op1_ptr = opx;
+
+ opx = TMP_ALLOC_LIMBS (res_size);
+ mpn_sub_1 (opx, op2_ptr, res_size, (mp_limb_t) 1);
+ op2_ptr = opx;
+
+ if (ALLOC(res) < res_size)
+ {
+ _mpz_realloc (res, res_size);
+ /* op1_ptr and op2_ptr point to temporary space. */
+ res_ptr = PTR(res);
+ }
+
+ /* First loop finds the size of the result. */
+ for (i = res_size - 1; i >= 0; i--)
+ if ((op1_ptr[i] & op2_ptr[i]) != 0)
+ break;
+ res_size = i + 1;
+
+ if (res_size != 0)
+ {
+ /* Second loop computes the real result. */
+ for (i = res_size - 1; i >= 0; i--)
+ res_ptr[i] = op1_ptr[i] & op2_ptr[i];
+
+ cy = mpn_add_1 (res_ptr, res_ptr, res_size, (mp_limb_t) 1);
+ if (cy)
+ {
+ res_ptr[res_size] = cy;
+ res_size++;
+ }
+ }
+ else
+ {
+ res_ptr[0] = 1;
+ res_size = 1;
+ }
+
+ SIZ(res) = -res_size;
+ TMP_FREE;
+ 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 res_alloc;
+ 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;
+
+ res_alloc = op2_size;
+
+ opx = TMP_ALLOC_LIMBS (op2_size);
+ mpn_sub_1 (opx, op2_ptr, op2_size, (mp_limb_t) 1);
+ op2_ptr = opx;
+ op2_size -= op2_ptr[op2_size - 1] == 0;
+
+ if (ALLOC(res) < res_alloc)
+ {
+ _mpz_realloc (res, res_alloc);
+ op1_ptr = PTR(op1);
+ /* op2_ptr points to temporary space. */
+ res_ptr = PTR(res);
+ }
+
+ if (op1_size >= op2_size)
+ {
+ /* We can just ignore the part of OP1 that stretches above OP2,
+ because the result limbs are zero there. */
+
+ /* First loop finds the size of the result. */
+ for (i = op2_size - 1; i >= 0; i--)
+ if ((~op1_ptr[i] & op2_ptr[i]) != 0)
+ break;
+ res_size = i + 1;
+ count = res_size;
+ }
+ else
+ {
+ res_size = op2_size;
+
+ /* Copy the part of OP2 that stretches above OP1, to RES. */
+ MPN_COPY (res_ptr + op1_size, op2_ptr + op1_size, op2_size - op1_size);
+ count = op1_size;
+ }
+
+ if (res_size != 0)
+ {
+ /* Second loop computes the real result. */
+ for (i = count - 1; i >= 0; i--)
+ res_ptr[i] = ~op1_ptr[i] & op2_ptr[i];
+
+ cy = mpn_add_1 (res_ptr, res_ptr, res_size, (mp_limb_t) 1);
+ if (cy)
+ {
+ res_ptr[res_size] = cy;
+ res_size++;
+ }
+ }
+ else
+ {
+ res_ptr[0] = 1;
+ res_size = 1;
+ }
+
+ SIZ(res) = -res_size;
+ }
+ TMP_FREE;
+}
projects / msp430-gcc.git / blobdiff