45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
/* IA-64 mpn_submul_1 -- Multiply a limb vector with a limb and subtract
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the result from a second limb vector.
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Copyright 2000, 2001, 2002 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
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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 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
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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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This code runs at about 9 cycles/limb on the Itanium. That's far from the peak
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execution speed of the Itanium pipeline. With well-tuned assembly code we
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should be able to get to around 3 cycles/limb. See README. */
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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 s1p, mp_size_t n, mp_limb_t s2d)
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{
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mp_ptr tp;
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mp_limb_t cy;
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TMP_DECL;
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TMP_MARK;
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tp = TMP_ALLOC_LIMBS (n);
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cy = mpn_mul_1 (tp, s1p, n, s2d);
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cy += mpn_sub_n (rp, rp, tp, n);
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TMP_FREE;
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return cy;
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}
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