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Diffstat (limited to 'Build/source/libs/gmp/gmp-6.0.0/mpz/cfdiv_q_2exp.c')
-rw-r--r-- | Build/source/libs/gmp/gmp-6.0.0/mpz/cfdiv_q_2exp.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/Build/source/libs/gmp/gmp-6.0.0/mpz/cfdiv_q_2exp.c b/Build/source/libs/gmp/gmp-6.0.0/mpz/cfdiv_q_2exp.c new file mode 100644 index 00000000000..c69e37c6054 --- /dev/null +++ b/Build/source/libs/gmp/gmp-6.0.0/mpz/cfdiv_q_2exp.c @@ -0,0 +1,113 @@ +/* mpz_cdiv_q_2exp, mpz_fdiv_q_2exp -- quotient from mpz divided by 2^n. + +Copyright 1991, 1993, 1994, 1996, 1998, 1999, 2001, 2002, 2004, 2012 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 either: + + * the GNU Lesser General Public License as published by the Free + Software Foundation; either version 3 of the License, or (at your + option) any later version. + +or + + * the GNU General Public License as published by the Free Software + Foundation; either version 2 of the License, or (at your option) any + later version. + +or both in parallel, as here. + +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 General Public License +for more details. + +You should have received copies of the GNU General Public License and the +GNU Lesser General Public License along with the GNU MP Library. If not, +see https://www.gnu.org/licenses/. */ + +#include "gmp.h" +#include "gmp-impl.h" + + +/* dir==1 for ceil, dir==-1 for floor */ + +static void __gmpz_cfdiv_q_2exp (REGPARM_3_1 (mpz_ptr, mpz_srcptr, mp_bitcnt_t, int)) REGPARM_ATTR (1); +#define cfdiv_q_2exp(w,u,cnt,dir) __gmpz_cfdiv_q_2exp (REGPARM_3_1 (w,u,cnt,dir)) + +REGPARM_ATTR (1) static void +cfdiv_q_2exp (mpz_ptr w, mpz_srcptr u, mp_bitcnt_t cnt, int dir) +{ + mp_size_t wsize, usize, abs_usize, limb_cnt, i; + mp_srcptr up; + mp_ptr wp; + mp_limb_t round, rmask; + + usize = SIZ (u); + abs_usize = ABS (usize); + limb_cnt = cnt / GMP_NUMB_BITS; + wsize = abs_usize - limb_cnt; + if (wsize <= 0) + { + /* u < 2**cnt, so result 1, 0 or -1 according to rounding */ + PTR(w)[0] = 1; + SIZ(w) = (usize == 0 || (usize ^ dir) < 0 ? 0 : dir); + return; + } + + /* +1 limb to allow for mpn_add_1 below */ + MPZ_REALLOC (w, wsize+1); + + /* Check for rounding if direction matches u sign. + Set round if we're skipping non-zero limbs. */ + up = PTR(u); + round = 0; + rmask = ((usize ^ dir) >= 0 ? MP_LIMB_T_MAX : 0); + if (rmask != 0) + for (i = 0; i < limb_cnt && round == 0; i++) + round = up[i]; + + wp = PTR(w); + cnt %= GMP_NUMB_BITS; + if (cnt != 0) + { + round |= rmask & mpn_rshift (wp, up + limb_cnt, wsize, cnt); + wsize -= (wp[wsize - 1] == 0); + } + else + MPN_COPY_INCR (wp, up + limb_cnt, wsize); + + if (round != 0) + { + if (wsize != 0) + { + mp_limb_t cy; + cy = mpn_add_1 (wp, wp, wsize, CNST_LIMB(1)); + wp[wsize] = cy; + wsize += cy; + } + else + { + /* We shifted something to zero. */ + wp[0] = 1; + wsize = 1; + } + } + SIZ(w) = (usize >= 0 ? wsize : -wsize); +} + + +void +mpz_cdiv_q_2exp (mpz_ptr w, mpz_srcptr u, mp_bitcnt_t cnt) +{ + cfdiv_q_2exp (w, u, cnt, 1); +} + +void +mpz_fdiv_q_2exp (mpz_ptr w, mpz_srcptr u, mp_bitcnt_t cnt) +{ + cfdiv_q_2exp (w, u, cnt, -1); +} |