70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/* Copyright 2012 The Code cavern
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This file is part of the MPIR Library.
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The MPIR Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License, or (at
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your option) any later version.
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The MPIR 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 Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the MPIR Library; see the file COPYING.LIB. If not, write
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to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include "mpir.h"
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#include "gmp-impl.h"
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mp_limb_t mpn_nsumdiff_n(mp_ptr s, mp_ptr d, mp_srcptr x, mp_srcptr y, mp_size_t n)
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{
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mp_limb_t ret;
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mp_ptr t;
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ASSERT_MPN(x, n);
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ASSERT_MPN(y, n);
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ASSERT(MPN_SAME_OR_SEPARATE_P(s, x, n));
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ASSERT(MPN_SAME_OR_SEPARATE_P(s, y, n));
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ASSERT(MPN_SAME_OR_SEPARATE_P(d, x, n));
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ASSERT(MPN_SAME_OR_SEPARATE_P(d, y, n));
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ASSERT(!MPN_OVERLAP_P(s, n, d, n));
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if (n == 0)
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return 0;
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if ((s == x && d == y) || (s == y && d == x))
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{
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t = __GMP_ALLOCATE_FUNC_LIMBS(n);
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ret = mpn_sub_n(t, x, y, n);
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ret += 2*mpn_add_n(s, x, y, n);
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ret += 2*mpn_neg_n(s, s, n);
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MPN_COPY(d, t, n);
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__GMP_FREE_FUNC_LIMBS(t, n);
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return ret;
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}
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if (s == x || s == y)
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{
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ret = mpn_sub_n(d, x, y, n);
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ret += 2*mpn_add_n(s, x, y, n);
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ret += 2*mpn_neg_n(s, s, n);
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return ret;
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}
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ret = 2*mpn_add_n(s, x, y, n);
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ret = 2*mpn_neg_n(s, s, n);
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ret += mpn_sub_n(d, x, y, n);
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return ret;
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}
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