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/root.c | 90 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 gmp-6.3.0/mpz/root.c

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

diff --git a/gmp-6.3.0/mpz/root.c b/gmp-6.3.0/mpz/root.c
new file mode 100644
index 0000000..7c8d368
--- /dev/null
+++ b/gmp-6.3.0/mpz/root.c
@@ -0,0 +1,90 @@
+/* mpz_root(root, u, nth) --  Set ROOT to floor(U^(1/nth)).
+   Return an indication if the result is exact.
+
+Copyright 1999-2003, 2005, 2012, 2020 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 <stdio.h>		/* for NULL */
+#include "gmp-impl.h"
+
+int
+mpz_root (mpz_ptr root, mpz_srcptr u, unsigned long int nth)
+{
+  mp_ptr rootp, up;
+  mp_size_t us, un, rootn, remn;
+  TMP_DECL;
+
+  us = SIZ(u);
+
+  /* even roots of negatives provoke an exception */
+  if (UNLIKELY (us < 0 && (nth & 1) == 0))
+    SQRT_OF_NEGATIVE;
+
+  if (UNLIKELY (nth <= 1))
+    {
+      /* root extraction interpreted as c^(1/nth) means a zeroth root should
+	 provoke a divide by zero, do this even if c==0 */
+      if (UNLIKELY (nth == 0))
+	DIVIDE_BY_ZERO;
+      /* nth == 1 */
+      if (root != NULL && u != root)
+	mpz_set (root, u);
+      return 1;			/* exact result */
+    }
+
+  if (us == 0)
+    {
+      if (root != NULL)
+	SIZ(root) = 0;
+      return 1;			/* exact result */
+    }
+
+  un = ABS (us);
+  rootn = (un - 1) / nth + 1;
+
+  TMP_MARK;
+
+  /* FIXME: Perhaps disallow root == NULL */
+  if (root != NULL && u != root)
+    rootp = MPZ_NEWALLOC (root, rootn);
+  else
+    rootp = TMP_ALLOC_LIMBS (rootn);
+
+  up = PTR(u);
+  remn = mpn_rootrem (rootp, NULL, up, un, (mp_limb_t) nth);
+
+  if (root != NULL)
+    {
+      SIZ(root) = us >= 0 ? rootn : -rootn;
+      if (u == root)
+	MPN_COPY (up, rootp, rootn);
+    }
+
+  TMP_FREE;
+  return remn == 0;
+}
-- 
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