X-Git-Url: https://oss.titaniummirror.com/gitweb?a=blobdiff_plain;f=gmp%2Fmpz%2Froot.c;fp=gmp%2Fmpz%2Froot.c;h=ece0a997bbebd928429b0ea01e3ca7be8cf267ee;hb=6fed43773c9b0ce596dca5686f37ac3fc0fa11c0;hp=0000000000000000000000000000000000000000;hpb=27b11d56b743098deb193d510b337ba22dc52e5c;p=msp430-gcc.git

diff --git a/gmp/mpz/root.c b/gmp/mpz/root.c
new file mode 100644
index 00000000..ece0a997
--- /dev/null
+++ b/gmp/mpz/root.c
@@ -0,0 +1,82 @@
+/* mpz_root(root, u, nth) --  Set ROOT to floor(U^(1/nth)).
+   Return an indication if the result is exact.
+
+Copyright 1999, 2000, 2001, 2002, 2003, 2005 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 3 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.  If not, see http://www.gnu.org/licenses/.  */
+
+#include <stdio.h>		/* for NULL */
+#include "gmp.h"
+#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 (us < 0 && (nth & 1) == 0)
+    SQRT_OF_NEGATIVE;
+
+  /* root extraction interpreted as c^(1/nth) means a zeroth root should
+     provoke a divide by zero, do this even if c==0 */
+  if (nth == 0)
+    DIVIDE_BY_ZERO;
+
+  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_REALLOC (root, rootn);
+  else
+    rootp = TMP_ALLOC_LIMBS (rootn);
+
+  up = PTR(u);
+
+  if (nth == 1)
+    {
+      MPN_COPY (rootp, up, un);
+      remn = 0;
+    }
+  else
+    {
+      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;
+}