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diff --git a/mpfr/tests/tacos.c b/mpfr/tests/tacos.c
new file mode 100644
index 00000000..40c20160
--- /dev/null
+++ b/mpfr/tests/tacos.c
@@ -0,0 +1,187 @@
+/* Test file for mpfr_acos.
+
+Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+Contributed by Mathieu Dutour.
+
+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"
+
+#define TEST_FUNCTION mpfr_acos
+#include "tgeneric.c"
+
+static void
+special (void)
+{
+  mpfr_t x, y;
+  int inex1, inex2;
+
+  mpfr_init2 (x, 32);
+  mpfr_init2 (y, 32);
+
+  mpfr_set_str_binary (x, "0.10001000001001011000100001E-6");
+  mpfr_acos (y, x, GMP_RNDN);
+  mpfr_set_str_binary (x, "1.10001111111111110001110110001");
+  if (mpfr_cmp (x, y))
+    {
+      printf ("Error in mpfr_acos (1)\n");
+      exit (1);
+    }
+
+  mpfr_set_str_binary (x, "-0.01101011110111100111010011001011");
+  mpfr_acos (y, x, GMP_RNDZ);
+  mpfr_set_str_binary (x, "10.0000000101111000011101000101");
+  if (mpfr_cmp (x, y))
+    {
+      printf ("Error in mpfr_acos (2)\n");
+      mpfr_print_binary (y); printf ("\n");
+      exit (1);
+    }
+
+  mpfr_set_prec (x, 2);
+  mpfr_set_ui (x, 0, GMP_RNDN);
+  inex1 = mpfr_acos (x, x, GMP_RNDN); /* Pi/2 */
+  inex2 = mpfr_const_pi (x, GMP_RNDN);
+  if (inex1 != inex2)
+    {
+      printf ("Error in mpfr_acos (3) for prec=2\n");
+      exit (1);
+    }
+
+  mpfr_clear (y);
+  mpfr_clear (x);
+}
+
+static void
+special_overflow (void)
+{
+  mpfr_t x, y;
+  mp_exp_t emin, emax;
+
+  emin = mpfr_get_emin ();
+  emax = mpfr_get_emax ();
+
+  set_emin (-125);
+  set_emax (128);
+  mpfr_init2 (x, 24);
+  mpfr_init2 (y, 48);
+  mpfr_set_str_binary (x, "0.101100100000000000110100E0");
+  mpfr_acos (y, x, GMP_RNDN);
+  if (mpfr_cmp_str (y, "0.110011010100101111000100111010111011010000001001E0",
+                    2, GMP_RNDN))
+    {
+      printf("Special Overflow error.\n");
+      mpfr_dump (y);
+      exit (1);
+    }
+  mpfr_clear (y);
+  mpfr_clear (x);
+  set_emin (emin);
+  set_emax (emax);
+}
+
+int
+main (void)
+{
+  mpfr_t x, y;
+  int r;
+
+  tests_start_mpfr ();
+
+  special_overflow ();
+  special ();
+
+  mpfr_init (x);
+  mpfr_init (y);
+
+  MPFR_SET_NAN(x);
+  mpfr_acos (y, x, GMP_RNDN);
+  if (mpfr_nan_p(y) == 0)
+    {
+      printf ("Error: acos(NaN) != NaN\n");
+      exit (1);
+    }
+
+  mpfr_set_ui (x, 2, GMP_RNDN);
+  mpfr_acos (y, x, GMP_RNDN);
+  if (mpfr_nan_p(y) == 0)
+    {
+      printf ("Error: acos(2) != NaN\n");
+      exit (1);
+    }
+
+  mpfr_set_si (x, -2, GMP_RNDN);
+  mpfr_acos (y, x, GMP_RNDN);
+  if (mpfr_nan_p(y) == 0)
+    {
+      printf ("Error: acos(-2) != NaN\n");
+      exit (1);
+    }
+
+  /* acos (1) = 0 */
+  mpfr_set_ui (x, 1, GMP_RNDN);
+  mpfr_acos (y, x, GMP_RNDN);
+  if (mpfr_cmp_ui (y, 0) || mpfr_sgn (y) < 0)
+    {
+      printf ("Error: acos(1) != +0.0\n");
+      exit (1);
+    }
+
+  /* acos (0) = Pi/2 */
+  for (r = 0; r < GMP_RND_MAX; r++)
+    {
+      mpfr_set_ui (x, 0, GMP_RNDN); /* exact */
+      mpfr_acos (y, x, (mp_rnd_t) r);
+      mpfr_const_pi (x, (mp_rnd_t) r);
+      mpfr_div_2exp (x, x, 1, GMP_RNDN); /* exact */
+      if (mpfr_cmp (x, y))
+        {
+          printf ("Error: acos(0) != Pi/2 for rnd=%s\n",
+                  mpfr_print_rnd_mode ((mp_rnd_t) r));
+          exit (1);
+        }
+    }
+
+  /* acos (-1) = Pi */
+  for (r = 0; r < GMP_RND_MAX; r++)
+    {
+      mpfr_set_si (x, -1, GMP_RNDN); /* exact */
+      mpfr_acos (y, x, (mp_rnd_t) r);
+      mpfr_const_pi (x, (mp_rnd_t) r);
+      if (mpfr_cmp (x, y))
+        {
+          printf ("Error: acos(1) != Pi for rnd=%s\n",
+                  mpfr_print_rnd_mode ((mp_rnd_t) r));
+          exit (1);
+        }
+    }
+
+  test_generic (2, 100, 7);
+
+  mpfr_clear (x);
+  mpfr_clear (y);
+
+  data_check ("data/acos", mpfr_acos, "mpfr_acos");
+  bad_cases (mpfr_acos, mpfr_cos, "mpfr_acos", 0, -40, 2, 4, 128, 800, 30);
+
+  tests_end_mpfr ();
+  return 0;
+}