mirror of
https://github.com/vale981/arb
synced 2025-03-05 09:21:38 -05:00
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/*=============================================================================
|
|
|
|
This file is part of ARB.
|
|
|
|
ARB is free software; you can redistribute it and/or modify
|
|
it under the terms of 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.
|
|
|
|
ARB 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 a copy of the GNU General Public License
|
|
along with ARB; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
=============================================================================*/
|
|
/******************************************************************************
|
|
|
|
Copyright (C) 2014 Fredrik Johansson
|
|
|
|
******************************************************************************/
|
|
|
|
#include "mag.h"
|
|
|
|
void
|
|
mag_set_d_2exp_fmpz(mag_t z, double c, const fmpz_t exp)
|
|
{
|
|
if (c == 0.0)
|
|
{
|
|
mag_zero(z);
|
|
}
|
|
else if (c > 1e300 || c < 0.0) /* not implemented */
|
|
{
|
|
printf("mag_set_d_2exp_fmpz\n");
|
|
abort();
|
|
}
|
|
else
|
|
{
|
|
int cexp, fix;
|
|
mp_limb_t man;
|
|
|
|
c = frexp(c, &cexp);
|
|
|
|
man = (mp_limb_t)(c * (double)(LIMB_ONE << MAG_BITS)) + 1;
|
|
|
|
fix = man >> (MAG_BITS);
|
|
man = (man >> fix) + fix; /* XXX: need +fix? */
|
|
MAG_MAN(z) = man;
|
|
_fmpz_add_fast(MAG_EXPREF(z), exp, cexp + fix);
|
|
}
|
|
}
|