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/set_f.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 gmp-6.3.0/mpz/set_f.c (limited to 'gmp-6.3.0/mpz/set_f.c') diff --git a/gmp-6.3.0/mpz/set_f.c b/gmp-6.3.0/mpz/set_f.c new file mode 100644 index 0000000..b3ecc0b --- /dev/null +++ b/gmp-6.3.0/mpz/set_f.c @@ -0,0 +1,71 @@ +/* mpz_set_f (dest_integer, src_float) -- Assign DEST_INTEGER from SRC_FLOAT. + +Copyright 1996, 2001, 2012, 2016 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" + + +void +mpz_set_f (mpz_ptr w, mpf_srcptr u) +{ + mp_ptr wp, up; + mp_size_t size; + mp_exp_t exp; + + /* abs(u)<1 truncates to zero */ + exp = EXP (u); + if (exp <= 0) + { + SIZ(w) = 0; + return; + } + + wp = MPZ_NEWALLOC (w, exp); + up = PTR(u); + + size = SIZ (u); + SIZ(w) = (size >= 0 ? exp : -exp); + size = ABS (size); + + if (exp > size) + { + /* pad with low zeros to get a total "exp" many limbs */ + mp_size_t zeros = exp - size; + MPN_ZERO (wp, zeros); + wp += zeros; + } + else + { + /* exp<=size, truncate to the high "exp" many limbs */ + up += (size - exp); + size = exp; + } + + MPN_COPY (wp, up, size); +} -- cgit v1.2.3