1 /* mpn_lshift -- Shift left 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 3 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. If not, see http://www.gnu.org/licenses/. */ 19 20 #include <intrinsics.h> 21 #include "gmp.h" 22 #include "gmp-impl.h" 23 24 mp_limb_t 25 mpn_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