Sync code from obs

1 files changed, 54 insertions, 0 deletions

diff --git a/sqrt_ui.c b/sqrt_ui.c
new file mode 100644
index 0000000..502273e
--- /dev/null
+++ b/sqrt_ui.c
@@ -0,0 +1,54 @@
+/* mpfr_sqrt_ui -- square root of a machine integer
+
+Copyright 2000, 2001, 2002, 2003, 2004, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+Contributed by the Arenaire and Cacao projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU MPFR 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 MPFR 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 MPFR Library; see the file COPYING.LESSER.  If not, see
+http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
+51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+#define MPFR_NEED_LONGLONG_H
+#include "mpfr-impl.h"
+
+int
+mpfr_sqrt_ui (mpfr_ptr r, unsigned long u, mpfr_rnd_t rnd_mode)
+{
+  if (u)
+    {
+      mpfr_t uu;
+      mp_limb_t up[1];
+      unsigned long cnt;
+      int inex;
+      MPFR_SAVE_EXPO_DECL (expo);
+
+      MPFR_TMP_INIT1 (up, uu, GMP_NUMB_BITS);
+      MPFR_ASSERTN (u == (mp_limb_t) u);
+      count_leading_zeros (cnt, (mp_limb_t) u);
+      *up = (mp_limb_t) u << cnt;
+
+      MPFR_SAVE_EXPO_MARK (expo);
+      MPFR_SET_EXP (uu, GMP_NUMB_BITS - cnt);
+      inex = mpfr_sqrt(r, uu, rnd_mode);
+      MPFR_SAVE_EXPO_FREE (expo);
+      return mpfr_check_range(r, inex, rnd_mode);
+    }
+  else /* sqrt(0) = 0 */
+    {
+      MPFR_SET_ZERO(r);
+      MPFR_SET_POS(r);
+      MPFR_RET(0);
+    }
+}