Add a generic test function which tests correct rounding (may give

false warnings in some exceptional cases).


git-svn-id: svn://scm.gforge.inria.fr/svn/mpc/trunk@85 211d60ee-9f03-0410-a15a-8952a2c7a4e4

3 files changed, 81 insertions, 3 deletions

diff --git a/Makefile.am b/Makefile.am
index 63cf235..2273104 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,4 +1,5 @@
 ## Makefile.am -- Process this file with automake to produce Makefile.in
 SUBDIRS = src tests doc
 
-include_HEADERS = $(top_srcdir)/src/mpc.h
+include_HEADERS = src/mpc.h
+EXTRA_DIST = tests/tgeneric.c
\ No newline at end of file
diff --git a/tests/Makefile.am b/tests/Makefile.am
index dc0f6a6..1ae8a8c 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -2,8 +2,8 @@
 LDADD = $(top_builddir)/src/libmpc.la
 
 
-AM_CPPFLAGS = -I$(top_srcdir)/src
-check_PROGRAMS = test tabs tcos tdiv texp tmul tsin tsqr
+AM_CPPFLAGS = -I$(top_srcdir)/src -I$(top_srcdir)/tests
+check_PROGRAMS = test tabs tcos tdiv texp tmul tsin tsqr tsqrt
 
 TESTS = $(check_PROGRAMS)
 CLEANFILES = mpc_test
diff --git a/tests/tgeneric.c b/tests/tgeneric.c
new file mode 100644
index 0000000..826e663
--- /dev/null
+++ b/tests/tgeneric.c
@@ -0,0 +1,77 @@
+/* file for generic tests.
+
+Copyright (C) 2008 INRIA.
+
+This file is part of the MPC Library.
+
+The MPC 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 MPC 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 MPC Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "mpfr.h"
+#include "mpc.h"
+
+#define FUNCTION_NAME(F) #F
+ 
+static void
+tgeneric()
+{
+  mpc_t  x, z, t, u;
+  mp_prec_t prec;
+
+  mpc_init (x);
+  mpc_init (z);
+  mpc_init (t);
+  mpc_init (u);
+
+  for (prec = 2; prec <= 1000; prec++)
+    {
+      mpc_set_prec (x, prec);
+      mpc_set_prec (z, prec);
+      mpc_set_prec (t, prec);
+      mpc_set_prec (u, 4*prec);
+
+      /* We compute the result with four times the precision and check        */
+      /* whether the rounding is correct. Error reports in this part of the   */
+      /* algorithm might still be wrong, though, since there are two          */
+      /* consecutive roundings.                                               */
+      mpc_random (x);
+      TEST_FUNCTION (z, x, MPC_RNDNN);
+      TEST_FUNCTION (u, x, MPC_RNDNN);
+      mpc_set (t, u, MPC_RNDNN);
+
+      if (mpc_cmp (z, t))
+	{
+	  fprintf (stderr, "rounding in " FUNCTION_NAME(TEST_FUNCTION) \
+		   " might be incorrect for\nx=");
+	  mpc_out_str (stderr, 2, 0, x, MPC_RNDNN);
+	  fprintf (stderr, "\n" FUNCTION_NAME(TEST_FUNCTION) "          "\
+		   "           gives ");
+	  mpc_out_str (stderr, 2, 0, z, MPC_RNDNN);
+	  fprintf (stderr, "\n" FUNCTION_NAME(TEST_FUNCTION) " quadruple "\
+		   "precision gives ");
+	  mpc_out_str (stderr, 2, 0, u, MPC_RNDNN);
+	  fprintf (stderr, "\nand is rounded to                 ");
+	  mpc_out_str (stderr, 2, 0, t, MPC_RNDNN);
+	  fprintf (stderr, "\n");
+	  exit (1);
+	}
+    }
+  mpc_clear (x);
+  mpc_clear (z);
+  mpc_clear (t);
+  mpc_clear (u);
+}