51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
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/* mpn_rshift -- Shift right low level for Cray vector processors.
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Copyright (C) 2000 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 <intrinsics.h>
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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_rshift (mp_ptr wp, mp_srcptr up, mp_size_t n, unsigned int cnt)
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{
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unsigned sh_1, sh_2;
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mp_size_t i;
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mp_limb_t retval;
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sh_1 = cnt;
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sh_2 = BITS_PER_MP_LIMB - sh_1;
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retval = up[0] << sh_2;
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#pragma _CRI ivdep
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for (i = 0; i < n - 1; i++)
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{
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#if 1
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wp[i] = (up[i] >> sh_1) | (up[i + 1] << sh_2);
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#else
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/* This is the recommended way, but at least on SV1 it is slower. */
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wp[i] = _dshiftr (up[i + 1], up[i], sh_1);
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#endif
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}
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wp[n - 1] = up[n - 1] >> sh_1;
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return retval;
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}
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