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/* Reference floating point routines.
Copyright (C) 1996 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"
#if __STDC__
void ref_mpf_add (mpf_t, const mpf_t, const mpf_t);
void ref_mpf_sub (mpf_t, const mpf_t, const mpf_t);
#else
void ref_mpf_add ();
void ref_mpf_sub ();
#endif
void
#if __STDC__
ref_mpf_add (mpf_t w, const mpf_t u, const mpf_t v)
#else
ref_mpf_add (w, u, v)
mpf_t w;
const mpf_t u;
const mpf_t v;
#endif
{
mp_size_t hi, lo, size;
mp_ptr ut, vt, wt;
int neg;
mp_exp_t exp;
mp_limb_t cy;
TMP_DECL (mark);
TMP_MARK (mark);
if (SIZ (u) == 0)
{
size = ABSIZ (v);
wt = (mp_ptr) TMP_ALLOC (size * BYTES_PER_MP_LIMB);
MPN_COPY (wt, PTR (v), size);
exp = EXP (v);
neg = SIZ (v) < 0;
goto done;
}
if (SIZ (v) == 0)
{
size = ABSIZ (u);
wt = (mp_ptr) TMP_ALLOC (size * BYTES_PER_MP_LIMB);
MPN_COPY (wt, PTR (u), size);
exp = EXP (u);
neg = SIZ (u) < 0;
goto done;
}
if ((SIZ (u) ^ SIZ (v)) < 0)
{
mpf_t tmp;
SIZ (tmp) = -SIZ (v);
EXP (tmp) = EXP (v);
PTR (tmp) = PTR (v);
ref_mpf_sub (w, u, tmp);
return;
}
neg = SIZ (u) < 0;
/* Compute the significance of the hi and lo end of the result. */
hi = MAX (EXP (u), EXP (v));
lo = MIN (EXP (u) - ABSIZ (u), EXP (v) - ABSIZ (v));
size = hi - lo;
ut = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
vt = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
wt = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
MPN_ZERO (ut, size);
MPN_ZERO (vt, size);
{int off;
off = size + (EXP (u) - hi) - ABSIZ (u);
MPN_COPY (ut + off, PTR (u), ABSIZ (u));
off = size + (EXP (v) - hi) - ABSIZ (v);
MPN_COPY (vt + off, PTR (v), ABSIZ (v));
}
cy = mpn_add_n (wt, ut, vt, size);
wt[size] = cy;
size += cy;
exp = hi + cy;
done:
if (size > PREC (w))
{
wt += size - PREC (w);
size = PREC (w);
}
MPN_COPY (PTR (w), wt, size);
SIZ (w) = neg == 0 ? size : -size;
EXP (w) = exp;
TMP_FREE (mark);
}
void
#if __STDC__
ref_mpf_sub (mpf_t w, const mpf_t u, const mpf_t v)
#else
ref_mpf_sub (w, u, v)
mpf_t w;
const mpf_t u;
const mpf_t v;
#endif
{
mp_size_t hi, lo, size;
mp_ptr ut, vt, wt;
int neg;
mp_exp_t exp;
TMP_DECL (mark);
TMP_MARK (mark);
if (SIZ (u) == 0)
{
size = ABSIZ (v);
wt = (mp_ptr) TMP_ALLOC (size * BYTES_PER_MP_LIMB);
MPN_COPY (wt, PTR (v), size);
exp = EXP (v);
neg = SIZ (v) > 0;
goto done;
}
if (SIZ (v) == 0)
{
size = ABSIZ (u);
wt = (mp_ptr) TMP_ALLOC (size * BYTES_PER_MP_LIMB);
MPN_COPY (wt, PTR (u), size);
exp = EXP (u);
neg = SIZ (u) < 0;
goto done;
}
if ((SIZ (u) ^ SIZ (v)) < 0)
{
mpf_t tmp;
SIZ (tmp) = -SIZ (v);
EXP (tmp) = EXP (v);
PTR (tmp) = PTR (v);
ref_mpf_add (w, u, tmp);
if (SIZ (u) < 0)
mpf_neg (w, w);
return;
}
neg = SIZ (u) < 0;
/* Compute the significance of the hi and lo end of the result. */
hi = MAX (EXP (u), EXP (v));
lo = MIN (EXP (u) - ABSIZ (u), EXP (v) - ABSIZ (v));
size = hi - lo;
ut = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
vt = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
wt = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
MPN_ZERO (ut, size);
MPN_ZERO (vt, size);
{int off;
off = size + (EXP (u) - hi) - ABSIZ (u);
MPN_COPY (ut + off, PTR (u), ABSIZ (u));
off = size + (EXP (v) - hi) - ABSIZ (v);
MPN_COPY (vt + off, PTR (v), ABSIZ (v));
}
if (mpn_cmp (ut, vt, size) >= 0)
mpn_sub_n (wt, ut, vt, size);
else
{
mpn_sub_n (wt, vt, ut, size);
neg ^= 1;
}
exp = hi;
while (size != 0 && wt[size - 1] == 0)
{
size--;
exp--;
}
done:
if (size > PREC (w))
{
wt += size - PREC (w);
size = PREC (w);
}
MPN_COPY (PTR (w), wt, size);
SIZ (w) = neg == 0 ? size : -size;
EXP (w) = exp;
TMP_FREE (mark);
}
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