--- /dev/null
+/* mpz_add_ui, mpz_sub_ui -- Add or subtract an mpz_t and an unsigned
+ one-word integer.
+
+Copyright 1991, 1993, 1994, 1996, 1999, 2000, 2001, 2002, 2004 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"
+
+
+#ifdef OPERATION_add_ui
+#define FUNCTION mpz_add_ui
+#define FUNCTION2 mpz_add
+#define VARIATION_CMP >=
+#define VARIATION_NEG
+#define VARIATION_UNNEG -
+#endif
+
+#ifdef OPERATION_sub_ui
+#define FUNCTION mpz_sub_ui
+#define FUNCTION2 mpz_sub
+#define VARIATION_CMP <
+#define VARIATION_NEG -
+#define VARIATION_UNNEG
+#endif
+
+#ifndef FUNCTION
+Error, need OPERATION_add_ui or OPERATION_sub_ui
+#endif
+
+
+void
+FUNCTION (mpz_ptr w, mpz_srcptr u, unsigned long int vval)
+{
+ mp_srcptr up;
+ mp_ptr wp;
+ mp_size_t usize, wsize;
+ mp_size_t abs_usize;
+
+#if BITS_PER_ULONG > GMP_NUMB_BITS /* avoid warnings about shift amount */
+ if (vval > GMP_NUMB_MAX)
+ {
+ mpz_t v;
+ mp_limb_t vl[2];
+ PTR(v) = vl;
+ vl[0] = vval & GMP_NUMB_MASK;
+ vl[1] = vval >> GMP_NUMB_BITS;
+ SIZ(v) = 2;
+ FUNCTION2 (w, u, v);
+ return;
+ }
+#endif
+
+ usize = u->_mp_size;
+ abs_usize = ABS (usize);
+
+ /* If not space for W (and possible carry), increase space. */
+ wsize = abs_usize + 1;
+ if (w->_mp_alloc < wsize)
+ _mpz_realloc (w, wsize);
+
+ /* These must be after realloc (U may be the same as W). */
+ up = u->_mp_d;
+ wp = w->_mp_d;
+
+ if (abs_usize == 0)
+ {
+ wp[0] = vval;
+ w->_mp_size = VARIATION_NEG (vval != 0);
+ return;
+ }
+
+ if (usize VARIATION_CMP 0)
+ {
+ mp_limb_t cy;
+ cy = mpn_add_1 (wp, up, abs_usize, (mp_limb_t) vval);
+ wp[abs_usize] = cy;
+ wsize = VARIATION_NEG (abs_usize + cy);
+ }
+ else
+ {
+ /* The signs are different. Need exact comparison to determine
+ which operand to subtract from which. */
+ if (abs_usize == 1 && up[0] < vval)
+ {
+ wp[0] = vval - up[0];
+ wsize = VARIATION_NEG 1;
+ }
+ else
+ {
+ mpn_sub_1 (wp, up, abs_usize, (mp_limb_t) vval);
+ /* Size can decrease with at most one limb. */
+ wsize = VARIATION_UNNEG (abs_usize - (wp[abs_usize - 1] == 0));
+ }
+ }
+
+ w->_mp_size = wsize;
+}