Refactor frexp*-ieee tests.

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

diff --git a/tests/test-frexp-ieee.h b/tests/test-frexp-ieee.h
new file mode 100644 (file)
index 0000000..83893b0
--- /dev/null
+++ b/tests/test-frexp-ieee.h
@@ -0,0 +1,61 @@
+/* Test of splitting a double into fraction and mantissa.
+   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.  */
+  {
+    int exp = -9999;
+    DOUBLE mantissa;
+    mantissa = FREXP (NAN, &exp);
+    ASSERT (ISNAN (mantissa));
+  }
+
+  /* Signed zero.  */
+  {
+    int exp = -9999;
+    DOUBLE mantissa;
+    mantissa = FREXP (L_(0.0), &exp);
+    ASSERT (mantissa == L_(0.0));
+    ASSERT (!signbit (mantissa));
+    ASSERT (exp == 0);
+  }
+  {
+    int exp = -9999;
+    DOUBLE mantissa;
+    mantissa = FREXP (MINUS_ZERO, &exp);
+    ASSERT (mantissa == L_(0.0));
+    ASSERT (!!signbit (mantissa) == !!signbit (MINUS_ZERO));
+    ASSERT (exp == 0);
+  }
+
+  /* Infinity.  */
+  {
+    int exp = -9999;
+    DOUBLE mantissa;
+    mantissa = FREXP (INFINITY, &exp);
+    ASSERT (mantissa == INFINITY);
+  }
+  {
+    int exp = -9999;
+    DOUBLE mantissa;
+    mantissa = FREXP (- INFINITY, &exp);
+    ASSERT (mantissa == - INFINITY);
+  }
+}