mirror of
https://review.haiku-os.org/buildtools
synced 2025-01-31 18:44:48 +01:00
f133d007f9
Old version was from 2012-05-06, 6.1.2 is from 2016-12-16 A lot of support for newer processors and speedups since then See gmp/NEWS for details
125 lines
3.0 KiB
C
125 lines
3.0 KiB
C
/* mpz_add, mpz_sub -- add or subtract integers.
|
|
|
|
Copyright 1991, 1993, 1994, 1996, 2000, 2001, 2011, 2012 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.h"
|
|
#include "gmp-impl.h"
|
|
|
|
|
|
#ifdef OPERATION_add
|
|
#define FUNCTION mpz_add
|
|
#define VARIATION
|
|
#endif
|
|
#ifdef OPERATION_sub
|
|
#define FUNCTION mpz_sub
|
|
#define VARIATION -
|
|
#endif
|
|
|
|
#ifndef FUNCTION
|
|
Error, need OPERATION_add or OPERATION_sub
|
|
#endif
|
|
|
|
|
|
void
|
|
FUNCTION (mpz_ptr w, mpz_srcptr u, mpz_srcptr v)
|
|
{
|
|
mp_srcptr up, vp;
|
|
mp_ptr wp;
|
|
mp_size_t usize, vsize, wsize;
|
|
mp_size_t abs_usize;
|
|
mp_size_t abs_vsize;
|
|
|
|
usize = SIZ(u);
|
|
vsize = VARIATION SIZ(v);
|
|
abs_usize = ABS (usize);
|
|
abs_vsize = ABS (vsize);
|
|
|
|
if (abs_usize < abs_vsize)
|
|
{
|
|
/* Swap U and V. */
|
|
MPZ_SRCPTR_SWAP (u, v);
|
|
MP_SIZE_T_SWAP (usize, vsize);
|
|
MP_SIZE_T_SWAP (abs_usize, abs_vsize);
|
|
}
|
|
|
|
/* True: ABS_USIZE >= ABS_VSIZE. */
|
|
|
|
/* If not space for w (and possible carry), increase space. */
|
|
wsize = abs_usize + 1;
|
|
wp = MPZ_REALLOC (w, wsize);
|
|
|
|
/* These must be after realloc (u or v may be the same as w). */
|
|
up = PTR(u);
|
|
vp = PTR(v);
|
|
|
|
if ((usize ^ vsize) < 0)
|
|
{
|
|
/* U and V have different sign. Need to compare them to determine
|
|
which operand to subtract from which. */
|
|
|
|
/* This test is right since ABS_USIZE >= ABS_VSIZE. */
|
|
if (abs_usize != abs_vsize)
|
|
{
|
|
mpn_sub (wp, up, abs_usize, vp, abs_vsize);
|
|
wsize = abs_usize;
|
|
MPN_NORMALIZE (wp, wsize);
|
|
if (usize < 0)
|
|
wsize = -wsize;
|
|
}
|
|
else if (mpn_cmp (up, vp, abs_usize) < 0)
|
|
{
|
|
mpn_sub_n (wp, vp, up, abs_usize);
|
|
wsize = abs_usize;
|
|
MPN_NORMALIZE (wp, wsize);
|
|
if (usize >= 0)
|
|
wsize = -wsize;
|
|
}
|
|
else
|
|
{
|
|
mpn_sub_n (wp, up, vp, abs_usize);
|
|
wsize = abs_usize;
|
|
MPN_NORMALIZE (wp, wsize);
|
|
if (usize < 0)
|
|
wsize = -wsize;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* U and V have same sign. Add them. */
|
|
mp_limb_t cy_limb = mpn_add (wp, up, abs_usize, vp, abs_vsize);
|
|
wp[abs_usize] = cy_limb;
|
|
wsize = abs_usize + cy_limb;
|
|
if (usize < 0)
|
|
wsize = -wsize;
|
|
}
|
|
|
|
SIZ(w) = wsize;
|
|
}
|