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