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diff --git a/mpfr/tests/tround_prec.c b/mpfr/tests/tround_prec.c
new file mode 100644
index 00000000..0f7728b9
--- /dev/null
+++ b/mpfr/tests/tround_prec.c
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+/* Test file for mpfr_prec_round.
+
+Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2006, 2007, 2008, 2009 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 2.1 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.LIB.  If not, write to
+the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+MA 02110-1301, USA. */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "mpfr-test.h"
+
+int
+main (void)
+{
+   mpfr_t x;
+   mp_exp_t emax;
+
+   tests_start_mpfr ();
+
+   mpfr_init (x);
+
+   mpfr_set_nan (x);
+   mpfr_prec_round (x, 2, GMP_RNDN);
+   MPFR_ASSERTN(mpfr_nan_p (x));
+
+   mpfr_set_inf (x, 1);
+   mpfr_prec_round (x, 2, GMP_RNDN);
+   MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);
+
+   mpfr_set_inf (x, -1);
+   mpfr_prec_round (x, 2, GMP_RNDN);
+   MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) < 0);
+
+   mpfr_set_ui (x, 0, GMP_RNDN);
+   mpfr_prec_round (x, 2, GMP_RNDN);
+   MPFR_ASSERTN(mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS(x));
+
+   mpfr_set_ui (x, 0, GMP_RNDN);
+   mpfr_neg (x, x, GMP_RNDN);
+   mpfr_prec_round (x, 2, GMP_RNDN);
+   MPFR_ASSERTN(mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_NEG(x));
+
+   emax = mpfr_get_emax ();
+   set_emax (0);
+   mpfr_set_prec (x, 3);
+   mpfr_set_str_binary (x, "0.111");
+   mpfr_prec_round (x, 2, GMP_RNDN);
+   MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);
+   set_emax (emax);
+
+   mpfr_set_prec (x, mp_bits_per_limb + 2);
+   mpfr_set_ui (x, 1, GMP_RNDN);
+   mpfr_nextbelow (x);
+   mpfr_prec_round (x, mp_bits_per_limb + 1, GMP_RNDN);
+   MPFR_ASSERTN(mpfr_cmp_ui (x, 1) == 0);
+
+   mpfr_set_prec (x, 3);
+   mpfr_set_ui (x, 5, GMP_RNDN);
+   mpfr_prec_round (x, 2, GMP_RNDN);
+   if (mpfr_cmp_ui(x, 4))
+     {
+       printf ("Error in tround: got ");
+       mpfr_out_str (stdout, 10, 0, x, GMP_RNDN);
+       printf (" instead of 4\n");
+       exit (1);
+     }
+
+   /* check case when reallocation is needed */
+   mpfr_set_prec (x, 3);
+   mpfr_set_ui (x, 5, GMP_RNDN); /* exact */
+   mpfr_prec_round (x, mp_bits_per_limb + 1, GMP_RNDN);
+   if (mpfr_cmp_ui(x, 5))
+     {
+       printf ("Error in tround: got ");
+       mpfr_out_str (stdout, 10, 0, x, GMP_RNDN);
+       printf (" instead of 5\n");
+       exit (1);
+     }
+
+   mpfr_clear(x);
+   mpfr_init2 (x, 3);
+   mpfr_set_si (x, -5, GMP_RNDN); /* exact */
+   mpfr_prec_round (x, mp_bits_per_limb + 1, GMP_RNDN);
+   if (mpfr_cmp_si(x, -5))
+     {
+       printf ("Error in tround: got ");
+       mpfr_out_str (stdout, 10, 0, x, GMP_RNDN);
+       printf (" instead of -5\n");
+       exit (1);
+     }
+
+   /* check case when new precision needs less limbs */
+   mpfr_set_prec (x, mp_bits_per_limb + 1);
+   mpfr_set_ui (x, 5, GMP_RNDN); /* exact */
+   mpfr_prec_round (x, 3, GMP_RNDN); /* exact */
+   if (mpfr_cmp_ui(x, 5))
+     {
+       printf ("Error in tround: got ");
+       mpfr_out_str (stdout, 10, 0, x, GMP_RNDN);
+       printf (" instead of 5\n");
+       exit (1);
+     }
+
+   mpfr_clear(x);
+
+   tests_end_mpfr ();
+   return 0;
+}