-/* mpz_mul -- Multiply two integers.
-
-Copyright (C) 1991 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 General Public License as published by
-the Free Software Foundation; either version 2, 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 General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with the GNU MP Library; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-#include "gmp.h"
-#include "gmp-impl.h"
-
-#ifndef BERKELEY_MP
-void
-#ifdef __STDC__
-mpz_mul (MP_INT *w, const MP_INT *u, const MP_INT *v)
-#else
-mpz_mul (w, u, v)
- MP_INT *w;
- const MP_INT *u;
- const MP_INT *v;
-#endif
-#else /* BERKELEY_MP */
-void
-#ifdef __STDC__
-mult (const MP_INT *u, const MP_INT *v, MP_INT *w)
-#else
-mult (u, v, w)
- const MP_INT *u;
- const MP_INT *v;
- MP_INT *w;
-#endif
-#endif /* BERKELEY_MP */
-{
- mp_size usize = u->size;
- mp_size vsize = v->size;
- mp_size wsize;
- mp_size sign_product;
- mp_ptr up, vp;
- mp_ptr wp;
- mp_ptr free_me = NULL;
- size_t free_me_size;
-
- sign_product = usize ^ vsize;
- usize = ABS (usize);
- vsize = ABS (vsize);
-
- if (usize < vsize)
- {
- /* Swap U and V. */
- {const MP_INT *t = u; u = v; v = t;}
- {mp_size t = usize; usize = vsize; vsize = t;}
- }
-
- up = u->d;
- vp = v->d;
- wp = w->d;
-
- /* Ensure W has space enough to store the result. */
- wsize = usize + vsize;
- if (w->alloc < wsize)
- {
- if (wp == up || wp == vp)
- {
- free_me = wp;
- free_me_size = w->alloc;
- }
- else
- (*_mp_free_func) (wp, w->alloc * BYTES_PER_MP_LIMB);
-
- w->alloc = wsize;
- wp = (mp_ptr) (*_mp_allocate_func) (wsize * BYTES_PER_MP_LIMB);
- w->d = wp;
- }
- else
- {
- /* Make U and V not overlap with W. */
- if (wp == up)
- {
- /* W and U are identical. Allocate temporary space for U. */
- up = (mp_ptr) alloca (usize * BYTES_PER_MP_LIMB);
- /* Is V identical too? Keep it identical with U. */
- if (wp == vp)
- vp = up;
- /* Copy to the temporary space. */
- MPN_COPY (up, wp, usize);
- }
- else if (wp == vp)
- {
- /* W and V are identical. Allocate temporary space for V. */
- vp = (mp_ptr) alloca (vsize * BYTES_PER_MP_LIMB);
- /* Copy to the temporary space. */
- MPN_COPY (vp, wp, vsize);
- }
- }
-
- wsize = mpn_mul (wp, up, usize, vp, vsize);
- w->size = sign_product < 0 ? -wsize : wsize;
- if (free_me != NULL)
- (*_mp_free_func) (free_me, free_me_size * BYTES_PER_MP_LIMB);
-
- alloca (0);
-}