94 lines
2.0 KiB
C
94 lines
2.0 KiB
C
/* mpz_set_d(integer, val) -- Assign INTEGER with a double value VAL.
|
|
|
|
Copyright (C) 1995 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 Library General Public License as published by
|
|
the Free Software Foundation; either version 2 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 Library General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public License
|
|
along with the GNU MP Library; see the file COPYING.LIB. If not, write to
|
|
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
|
|
MA 02111-1307, USA. */
|
|
|
|
#include "gmp.h"
|
|
#include "gmp-impl.h"
|
|
|
|
void
|
|
#if __STDC__
|
|
mpz_set_d (mpz_ptr r, double d)
|
|
#else
|
|
mpz_set_d (r, d)
|
|
mpz_ptr r;
|
|
double d;
|
|
#endif
|
|
{
|
|
int negative;
|
|
mp_size_t size;
|
|
mp_limb_t tp[3];
|
|
mp_ptr rp;
|
|
|
|
negative = d < 0;
|
|
d = ABS (d);
|
|
|
|
/* Handle small arguments quickly. */
|
|
if (d < MP_BASE_AS_DOUBLE)
|
|
{
|
|
mp_limb_t tmp;
|
|
tmp = d;
|
|
PTR(r)[0] = tmp;
|
|
SIZ(r) = negative ? -(tmp != 0) : (tmp != 0);
|
|
return;
|
|
}
|
|
|
|
size = __gmp_extract_double (tp, d);
|
|
|
|
if (ALLOC(r) < size)
|
|
_mpz_realloc (r, size);
|
|
|
|
rp = PTR (r);
|
|
|
|
#if BITS_PER_MP_LIMB == 32
|
|
switch (size)
|
|
{
|
|
default:
|
|
MPN_ZERO (rp, size - 3);
|
|
rp += size - 3;
|
|
case 3:
|
|
rp[2] = tp[2];
|
|
rp[1] = tp[1];
|
|
rp[0] = tp[0];
|
|
break;
|
|
case 2:
|
|
rp[1] = tp[2];
|
|
rp[0] = tp[1];
|
|
break;
|
|
case 1:
|
|
abort ();
|
|
}
|
|
#else
|
|
switch (size)
|
|
{
|
|
default:
|
|
MPN_ZERO (rp, size - 2);
|
|
rp += size - 2;
|
|
case 2:
|
|
rp[1] = tp[1];
|
|
rp[0] = tp[0];
|
|
break;
|
|
case 1:
|
|
abort ();
|
|
}
|
|
#endif
|
|
|
|
SIZ(r) = negative ? -size : size;
|
|
}
|