mirror of
https://github.com/vale981/arb
synced 2025-03-06 01:41:39 -05:00
57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
|
/*
|
||
|
|
Copyright (C) 2014 Fredrik Johansson
|
||
|
|
|
||
|
|
This file is part of Arb.
|
||
|
|
|
||
|
|
Arb is free software: you can redistribute it and/or modify it under
|
||
|
|
the terms of the GNU Lesser General Public License (LGPL) as published
|
||
|
|
by the Free Software Foundation; either version 2.1 of the License, or
|
||
|
|
(at your option) any later version. See <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "mag.h"
|
||
|
|
|
||
|
|
void
|
||
|
|
mag_set_ui_2exp_si(mag_t z, ulong x, slong e)
|
||
|
|
{
|
||
|
|
_fmpz_demote(MAG_EXPREF(z));
|
||
|
|
|
||
|
|
if (x == 0)
|
||
|
|
{
|
||
|
|
MAG_EXP(z) = 0;
|
||
|
|
MAG_MAN(z) = 0;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
slong bits;
|
||
|
|
mp_limb_t overflow;
|
||
|
|
|
||
|
|
count_leading_zeros(bits, x);
|
||
|
|
bits = FLINT_BITS - bits;
|
||
|
|
|
||
|
|
if (bits <= MAG_BITS)
|
||
|
|
{
|
||
|
|
x = x << (MAG_BITS - bits);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
x = (x >> (bits - MAG_BITS)) + 1;
|
||
|
|
overflow = x >> MAG_BITS;
|
||
|
|
bits += overflow;
|
||
|
|
x >>= overflow;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (e >= MAG_MIN_LAGOM_EXP && e <= MAG_MAX_LAGOM_EXP)
|
||
|
|
{
|
||
|
|
MAG_EXP(z) = bits + e;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
fmpz_set_si(MAG_EXPREF(z), e);
|
||
|
|
fmpz_add_si(MAG_EXPREF(z), MAG_EXPREF(z), bits);
|
||
|
|
}
|
||
|
|
|
||
|
|
MAG_MAN(z) = x;
|
||
|
|
}
|
||
|
|
}
|