1 files changed, 49 insertions, 0 deletions
diff --git a/math/test-iszero-excess-precision.c b/math/test-iszero-excess-precision.c
new file mode 100644
index 0000000000..52abc5aae4
--- /dev/null
+++ b/math/test-iszero-excess-precision.c
@@ -0,0 +1,49 @@
+/* Test iszero with excess precision.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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 C 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 C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <float.h>
+#include <math.h>
+#include <stdio.h>
+
+#define TEST(TYPE, TRUE_MIN)						\
+  do									\
+    {									\
+      if (iszero (TRUE_MIN / 2))					\
+	puts ("iszero removes excess precision for " #TYPE);		\
+      else								\
+	{								\
+	  puts ("iszero fails to remove excess precision for " #TYPE);	\
+	  result = 1;							\
+	}								\
+    }									\
+  while (0)
+
+static int
+do_test (void)
+{
+  int result = 0;
+
+  TEST (float, FLT_TRUE_MIN);
+  TEST (double, DBL_TRUE_MIN);
+  TEST (long double, LDBL_TRUE_MIN);
+
+  return result;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"