summaryrefslogtreecommitdiff
path: root/Build/source/libs/gmp/gmp-6.0.0/mpz/cfdiv_q_2exp.c
diff options
context:
space:
mode:
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.c113
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);
+}