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Annotation of OpenXM_contrib/gmp/mpn/cray/rshift.c, Revision 1.1

1.1     ! ohara       1: /* mpn_rshift -- Shift right low level for Cray vector processors.
        !             2:
        !             3: Copyright (C) 2000 Free Software Foundation, Inc.
        !             4:
        !             5: This file is part of the GNU MP Library.
        !             6:
        !             7: The GNU MP Library is free software; you can redistribute it and/or modify
        !             8: it under the terms of the GNU Lesser General Public License as published by
        !             9: the Free Software Foundation; either version 2.1 of the License, or (at your
        !            10: option) any later version.
        !            11:
        !            12: The GNU MP Library is distributed in the hope that it will be useful, but
        !            13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            15: License for more details.
        !            16:
        !            17: You should have received a copy of the GNU Lesser General Public License
        !            18: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            20: MA 02111-1307, USA. */
        !            21:
        !            22: #include <intrinsics.h>
        !            23: #include "gmp.h"
        !            24: #include "gmp-impl.h"
        !            25:
        !            26: mp_limb_t
        !            27: mpn_rshift (mp_ptr wp, mp_srcptr up, mp_size_t n, unsigned int cnt)
        !            28: {
        !            29:   unsigned sh_1, sh_2;
        !            30:   mp_size_t i;
        !            31:   mp_limb_t retval;
        !            32:
        !            33:   sh_1 = cnt;
        !            34:   sh_2 = BITS_PER_MP_LIMB - sh_1;
        !            35:   retval = up[0] << sh_2;
        !            36:
        !            37: #pragma _CRI ivdep
        !            38:   for (i = 0; i < n - 1; i++)
        !            39:     {
        !            40: #if 1
        !            41:       wp[i] = (up[i] >> sh_1) | (up[i + 1] << sh_2);
        !            42: #else
        !            43:       /* This is the recommended way, but at least on SV1 it is slower.  */
        !            44:       wp[i] = _dshiftr (up[i + 1], up[i], sh_1);
        !            45: #endif
        !            46:     }
        !            47:
        !            48:   wp[n - 1] = up[n - 1] >> sh_1;
        !            49:   return retval;
        !            50: }