1 files changed, 33 insertions, 0 deletions
diff --git a/mpfr/src/min_prec.c b/mpfr/src/min_prec.c
new file mode 100644
index 0000000000..7df9e77521
--- /dev/null
+++ b/mpfr/src/min_prec.c
@@ -0,0 +1,33 @@
+/* mpfr_min_prec -- minimal size in bits to hold the mantissa
+
+Copyright 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
+Contributed by the AriC and Caramel 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. */
+
+#include "mpfr-impl.h"
+
+mpfr_prec_t
+mpfr_min_prec (mpfr_srcptr x)
+{
+  if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (x)))
+    return 0;
+
+  /* from a suggestion by Andreas Enge (2010-11-18) */
+  return MPFR_LIMB_SIZE (x) * GMP_NUMB_BITS - mpn_scan1 (MPFR_MANT (x), 0);
+}