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Diffstat (limited to 'stdlib/rshift.c')
-rw-r--r-- | stdlib/rshift.c | 78 |
1 files changed, 0 insertions, 78 deletions
diff --git a/stdlib/rshift.c b/stdlib/rshift.c deleted file mode 100644 index d4c7f77769..0000000000 --- a/stdlib/rshift.c +++ /dev/null @@ -1,78 +0,0 @@ -/* mpn_rshift -- Shift right a low-level natural-number integer. - -Copyright (C) 1991-2017 Free Software Foundation, Inc. - -This file is part of the GNU MP Library. - -The GNU MP Library is free software; you can redistribute it and/or modify -it under the terms of the GNU Lesser General Public License as published by -the Free Software Foundation; either version 2.1 of the License, or (at your -option) any later version. - -The GNU MP Library is distributed in the hope that it will be useful, but -WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public -License for more details. - -You should have received a copy of the GNU Lesser General Public License -along with the GNU MP Library; see the file COPYING.LIB. If not, see -<http://www.gnu.org/licenses/>. */ - -#include <gmp.h> -#include "gmp-impl.h" - -#include <assert.h> - -/* Shift U (pointed to by UP and USIZE limbs long) CNT bits to the right - and store the USIZE least significant limbs of the result at WP. - The bits shifted out to the right are returned. - - Argument constraints: - 1. 0 < CNT < BITS_PER_MP_LIMB - 2. If the result is to be written over the input, WP must be <= UP. -*/ - -mp_limb_t -mpn_rshift (register mp_ptr wp, - register mp_srcptr up, mp_size_t usize, - register unsigned int cnt) -{ - register mp_limb_t high_limb, low_limb; - register unsigned sh_1, sh_2; - register mp_size_t i; - mp_limb_t retval; - - assert (usize != 0 && cnt != 0); - - sh_1 = cnt; - -#if 0 - if (sh_1 == 0) - { - if (wp != up) - { - /* Copy from low end to high end, to allow specified input/output - overlapping. */ - for (i = 0; i < usize; i++) - wp[i] = up[i]; - } - return usize; - } -#endif - - wp -= 1; - sh_2 = BITS_PER_MP_LIMB - sh_1; - high_limb = up[0]; - retval = high_limb << sh_2; - low_limb = high_limb; - - for (i = 1; i < usize; i++) - { - high_limb = up[i]; - wp[i] = (low_limb >> sh_1) | (high_limb << sh_2); - low_limb = high_limb; - } - wp[i] = low_limb >> sh_1; - - return retval; -} |