From 11da511c784eca003deb90c23570f0873954e0de Mon Sep 17 00:00:00 2001 From: Duncan Wilkie Date: Sat, 18 Nov 2023 06:11:09 -0600 Subject: Initial commit. --- gmp-6.3.0/mpz/get_si.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 gmp-6.3.0/mpz/get_si.c (limited to 'gmp-6.3.0/mpz/get_si.c') diff --git a/gmp-6.3.0/mpz/get_si.c b/gmp-6.3.0/mpz/get_si.c new file mode 100644 index 0000000..c65be2e --- /dev/null +++ b/gmp-6.3.0/mpz/get_si.c @@ -0,0 +1,52 @@ +/* mpz_get_si(integer) -- Return the least significant digit from INTEGER. + +Copyright 1991, 1993-1995, 2000-2002, 2006, 2012 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 either: + + * 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. + +or + + * the GNU General Public License as published by the Free Software + Foundation; either version 2 of the License, or (at your option) any + later version. + +or both in parallel, as here. + +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 General Public License +for more details. + +You should have received copies of the GNU General Public License and the +GNU Lesser General Public License along with the GNU MP Library. If not, +see https://www.gnu.org/licenses/. */ + +#include "gmp-impl.h" + +signed long int +mpz_get_si (mpz_srcptr z) __GMP_NOTHROW +{ + mp_ptr zp = PTR (z); + mp_size_t size = SIZ (z); + mp_limb_t zl = zp[0]; + +#if GMP_NAIL_BITS != 0 + if (ULONG_MAX > GMP_NUMB_MAX && ABS (size) >= 2) + zl |= zp[1] << GMP_NUMB_BITS; +#endif + + if (size > 0) + return zl & LONG_MAX; + else if (size < 0) + /* This expression is necessary to properly handle 0x80000000 */ + return -1 - (long) ((zl - 1) & LONG_MAX); + else + return 0; +} -- cgit v1.2.3