41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
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/* mpn_submul_1 for Cray PVP.
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Copyright 1996, 2000, 2001 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 the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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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 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 GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "gmp.h"
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#include "gmp-impl.h"
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mp_limb_t
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mpn_submul_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t limb)
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{
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mp_limb_t p0[n], p1[n], tp[n];
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mp_limb_t cy_limb;
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GMPN_MULWW (p1, p0, up, &n, &limb);
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cy_limb = mpn_sub_n (tp, rp, p0, n);
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rp[0] = tp[0];
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if (n != 1)
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cy_limb += mpn_sub_n (rp + 1, tp + 1, p1, n - 1);
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cy_limb += p1[n - 1];
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return cy_limb;
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}
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