Tests for module 'fmodf-ieee'.

[gnulib.git] / tests / test-fmod-ieee.h

diff --git a/tests/test-fmod-ieee.h b/tests/test-fmod-ieee.h
new file mode 100644 (file)
index 0000000..986a8e4
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+++ b/tests/test-fmod-ieee.h
@@ -0,0 +1,98 @@
+/* Test of fmod*() function family.
+   Copyright (C) 2012 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+static void
+test_function (void)
+{
+  /* [MX] shaded specification in POSIX.  */
+
+  /* NaN.  */
+  ASSERT (ISNAN (FMOD (NAN, L_(2.0))));
+  ASSERT (ISNAN (FMOD (NAN, L_(0.0))));
+  ASSERT (ISNAN (FMOD (L_(2.0), NAN)));
+  ASSERT (ISNAN (FMOD (L_(0.0), NAN)));
+  ASSERT (ISNAN (FMOD (NAN, NAN)));
+
+  /* y is zero.  */
+  ASSERT (ISNAN (FMOD (L_(2.0), L_(0.0))));
+  ASSERT (ISNAN (FMOD (L_(2.0), MINUS_ZERO)));
+  ASSERT (ISNAN (FMOD (INFINITY, L_(0.0))));
+  ASSERT (ISNAN (FMOD (INFINITY, MINUS_ZERO)));
+
+  /* x is infinite.  */
+  ASSERT (ISNAN (FMOD (INFINITY, L_(2.0))));
+  ASSERT (ISNAN (FMOD (INFINITY, - L_(2.0))));
+
+  /* x is zero.  */
+  {
+    DOUBLE z = FMOD (L_(0.0), L_(2.0));
+    ASSERT (z == L_(0.0));
+    ASSERT (!signbit (z));
+  }
+  {
+    DOUBLE z = FMOD (MINUS_ZERO, L_(2.0));
+    ASSERT (z == L_(0.0));
+    ASSERT (!!signbit (z) == !!signbit (MINUS_ZERO));
+  }
+  {
+    DOUBLE z = FMOD (L_(0.0), - L_(2.0));
+    ASSERT (z == L_(0.0));
+    ASSERT (!signbit (z));
+  }
+  {
+    DOUBLE z = FMOD (MINUS_ZERO, - L_(2.0));
+    ASSERT (z == L_(0.0));
+    ASSERT (!!signbit (z) == !!signbit (MINUS_ZERO));
+  }
+  {
+    DOUBLE z = FMOD (L_(0.0), INFINITY);
+    ASSERT (z == L_(0.0));
+    ASSERT (!signbit (z));
+  }
+  {
+    DOUBLE z = FMOD (MINUS_ZERO, INFINITY);
+    ASSERT (z == L_(0.0));
+    ASSERT (!!signbit (z) == !!signbit (MINUS_ZERO));
+  }
+  {
+    DOUBLE z = FMOD (L_(0.0), - INFINITY);
+    ASSERT (z == L_(0.0));
+    ASSERT (!signbit (z));
+  }
+  {
+    DOUBLE z = FMOD (MINUS_ZERO, - INFINITY);
+    ASSERT (z == L_(0.0));
+    ASSERT (!!signbit (z) == !!signbit (MINUS_ZERO));
+  }
+
+  /* y is infinite.  */
+  {
+    DOUBLE z = FMOD (L_(2.5), INFINITY);
+    ASSERT (z == L_(2.5));
+  }
+  {
+    DOUBLE z = FMOD (L_(2.5), - INFINITY);
+    ASSERT (z == L_(2.5));
+  }
+  {
+    DOUBLE z = FMOD (- L_(2.5), INFINITY);
+    ASSERT (z == - L_(2.5));
+  }
+  {
+    DOUBLE z = FMOD (- L_(2.5), - INFINITY);
+    ASSERT (z == - L_(2.5));
+  }
+}