vasilito
ff4ff35918
Red Bear OS is a full fork. All sources must be available from git clone with zero network access. Removed gitignore rules that excluded fetched source trees under recipes/*/source/, local/recipes/kde/*/source/, local/recipes/qt/*/source/, and vendor source trees. Build artifacts (target/, build/, source.tar, *.o, *.so) remain excluded. 127291 files added — kernel, relibc, base, bootloader, pkgar, all KDE/Qt frameworks, mesa, wayland, DRM drivers, and every other recipe source.
160 lines
3.6 KiB
C
160 lines
3.6 KiB
C
/* mpz_mul -- Multiply two integers.
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Copyright 1991, 1993, 1994, 1996, 2000, 2001, 2005, 2009, 2011, 2012,
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2015 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any
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later version.
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or both in parallel, as here.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received copies of the GNU General Public License and the
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GNU Lesser General Public License along with the GNU MP Library. If not,
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see https://www.gnu.org/licenses/. */
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#include <stdio.h> /* for NULL */
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#include "gmp-impl.h"
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void
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mpz_mul (mpz_ptr w, mpz_srcptr u, mpz_srcptr v)
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{
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mp_size_t usize;
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mp_size_t vsize;
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mp_size_t wsize;
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mp_size_t sign_product;
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mp_ptr up, vp;
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mp_ptr wp;
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mp_ptr free_me;
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size_t free_me_size;
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mp_limb_t cy_limb;
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TMP_DECL;
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usize = SIZ (u);
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vsize = SIZ (v);
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sign_product = usize ^ vsize;
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usize = ABS (usize);
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vsize = ABS (vsize);
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if (usize < vsize)
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{
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MPZ_SRCPTR_SWAP (u, v);
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MP_SIZE_T_SWAP (usize, vsize);
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}
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if (vsize == 0)
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{
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SIZ (w) = 0;
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return;
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}
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#if HAVE_NATIVE_mpn_mul_2
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if (vsize <= 2)
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{
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wp = MPZ_REALLOC (w, usize+vsize);
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if (vsize == 1)
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cy_limb = mpn_mul_1 (wp, PTR (u), usize, PTR (v)[0]);
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else
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{
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cy_limb = mpn_mul_2 (wp, PTR (u), usize, PTR (v));
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usize++;
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}
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wp[usize] = cy_limb;
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usize += (cy_limb != 0);
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SIZ (w) = (sign_product >= 0 ? usize : -usize);
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return;
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}
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#else
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if (vsize == 1)
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{
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wp = MPZ_REALLOC (w, usize+1);
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cy_limb = mpn_mul_1 (wp, PTR (u), usize, PTR (v)[0]);
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wp[usize] = cy_limb;
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usize += (cy_limb != 0);
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SIZ (w) = (sign_product >= 0 ? usize : -usize);
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return;
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}
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#endif
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TMP_MARK;
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free_me = NULL;
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up = PTR (u);
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vp = PTR (v);
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wp = PTR (w);
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/* Ensure W has space enough to store the result. */
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wsize = usize + vsize;
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if (ALLOC (w) < wsize)
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{
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if (ALLOC (w) != 0)
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{
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if (wp == up || wp == vp)
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{
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free_me = wp;
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free_me_size = ALLOC (w);
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}
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else
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(*__gmp_free_func) (wp, (size_t) ALLOC (w) * GMP_LIMB_BYTES);
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}
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ALLOC (w) = wsize;
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wp = __GMP_ALLOCATE_FUNC_LIMBS (wsize);
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PTR (w) = wp;
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}
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else
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{
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/* Make U and V not overlap with W. */
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if (wp == up)
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{
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/* W and U are identical. Allocate temporary space for U. */
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up = TMP_ALLOC_LIMBS (usize);
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/* Is V identical too? Keep it identical with U. */
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if (wp == vp)
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vp = up;
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/* Copy to the temporary space. */
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MPN_COPY (up, wp, usize);
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}
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else if (wp == vp)
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{
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/* W and V are identical. Allocate temporary space for V. */
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vp = TMP_ALLOC_LIMBS (vsize);
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/* Copy to the temporary space. */
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MPN_COPY (vp, wp, vsize);
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}
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}
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if (up == vp)
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{
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mpn_sqr (wp, up, usize);
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cy_limb = wp[wsize - 1];
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}
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else
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{
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cy_limb = mpn_mul (wp, up, usize, vp, vsize);
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}
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wsize -= cy_limb == 0;
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SIZ (w) = sign_product < 0 ? -wsize : wsize;
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if (free_me != NULL)
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(*__gmp_free_func) (free_me, free_me_size * GMP_LIMB_BYTES);
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TMP_FREE;
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}
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