--- /dev/null
+/* mpz_init2 -- initialize mpz, with requested size in bits.
+
+Copyright 2001, 2002, 2008 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 <stdlib.h>
+#include <stdio.h>
+#include "gmp.h"
+#include "gmp-impl.h"
+
+void
+mpz_init2 (mpz_ptr x, unsigned long bits)
+{
+ mp_size_t new_alloc;
+
+ bits -= (bits != 0); /* Round down, except if 0 */
+ new_alloc = 1 + bits / GMP_NUMB_BITS;
+
+ if (sizeof (unsigned long) > sizeof (int)) /* param vs _mp_size field */
+ {
+ if (UNLIKELY (new_alloc > INT_MAX))
+ {
+ fprintf (stderr, "gmp: overflow in mpz type\n");
+ abort ();
+ }
+ }
+
+ PTR(x) = __GMP_ALLOCATE_FUNC_LIMBS (new_alloc);
+ ALLOC(x) = new_alloc;
+ SIZ(x) = 0;
+
+#ifdef __CHECKER__
+ /* let the low limb look initialized, for the benefit of mpz_get_ui etc */
+ PTR(x)[0] = 0;
+#endif
+}