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diff --git a/Build/source/libs/mpfi/mpfi-src/src/exp.c b/Build/source/libs/mpfi/mpfi-src/src/exp.c
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+/* exp.c -- Exponential of an interval.
+
+Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2010,
+ Spaces project, Inria Lorraine
+ and Salsa project, INRIA Rocquencourt,
+ and Arenaire project, Inria Rhone-Alpes, France
+ and Lab. ANO, USTL (Univ. of Lille), France
+
+This file is part of the MPFI Library.
+
+The MPFI 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 2.1 of the License, or (at your
+option) any later version.
+
+The MPFI 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 MPFI Library; see the file COPYING.LIB. If not, write to
+the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+MA 02110-1301, USA. */
+
+#include "mpfi-impl.h"
+
+/* Computes the exp of an interval */
+int
+mpfi_exp (mpfi_ptr a, mpfi_srcptr b)
+{
+ int inexact_left, inexact_right, inexact=0;
+
+ inexact_left = mpfr_exp (&(a->left), &(b->left), MPFI_RNDD);
+ inexact_right = mpfr_exp (&(a->right), &(b->right), MPFI_RNDU);
+
+ /* do not allow +0 as upper bound */
+ if (mpfr_zero_p (&(a->right)) && !mpfr_signbit (&(a->right))) {
+ mpfr_neg (&(a->right), &(a->right), MPFI_RNDD);
+ }
+
+ if ( MPFI_NAN_P (a) )
+ MPFR_RET_NAN;
+
+ if (inexact_left)
+ inexact += 1;
+ if (inexact_right)
+ inexact += 2;
+
+ return inexact;
+}