From 11da511c784eca003deb90c23570f0873954e0de Mon Sep 17 00:00:00 2001
From: Duncan Wilkie <antigravityd@gmail.com>
Date: Sat, 18 Nov 2023 06:11:09 -0600
Subject: Initial commit.

---
 gmp-6.3.0/mpz/cfdiv_q_2exp.c | 111 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 gmp-6.3.0/mpz/cfdiv_q_2exp.c

(limited to 'gmp-6.3.0/mpz/cfdiv_q_2exp.c')

diff --git a/gmp-6.3.0/mpz/cfdiv_q_2exp.c b/gmp-6.3.0/mpz/cfdiv_q_2exp.c
new file mode 100644
index 0000000..413ea36
--- /dev/null
+++ b/gmp-6.3.0/mpz/cfdiv_q_2exp.c
@@ -0,0 +1,111 @@
+/* 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,
+2015 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-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 */
+      MPZ_NEWALLOC (w, 1)[0] = 1;
+      SIZ(w) = (usize == 0 || (usize ^ dir) < 0 ? 0 : dir);
+      return;
+    }
+
+  /* +1 limb to allow for mpn_add_1 below */
+  wp = 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];
+
+  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);
+}
-- 
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