1 files changed, 88 insertions, 0 deletions
diff --git a/tests/signed-nan.h b/tests/signed-nan.h
new file mode 100644
index 00000000..18a550a7
--- /dev/null
+++ b/tests/signed-nan.h
@@ -0,0 +1,88 @@
+/* Macros for quiet not-a-number.
+   Copyright (C) 2023-2024 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 <https://www.gnu.org/licenses/>.  */
+
+#ifndef _SIGNED_NAN_H
+#define _SIGNED_NAN_H
+
+#include <math.h>
+
+#include "nan.h"
+
+
+/* Returns a quiet 'float' NaN with sign bit == 0.  */
+_GL_UNUSED static float
+positive_NaNf ()
+{
+  /* 'volatile' works around a GCC bug:
+     <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111655>  */
+  float volatile nan = NaNf ();
+  return (signbit (nan) ? - nan : nan);
+}
+
+/* Returns a quiet 'float' NaN with sign bit == 1.  */
+_GL_UNUSED static float
+negative_NaNf ()
+{
+  /* 'volatile' works around a GCC bug:
+     <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111655>  */
+  float volatile nan = NaNf ();
+  return (signbit (nan) ? nan : - nan);
+}
+
+
+/* Returns a quiet 'double' NaN with sign bit == 0.  */
+_GL_UNUSED static double
+positive_NaNd ()
+{
+  /* 'volatile' works around a GCC bug:
+     <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111655>  */
+  double volatile nan = NaNd ();
+  return (signbit (nan) ? - nan : nan);
+}
+
+/* Returns a quiet 'double' NaN with sign bit == 1.  */
+_GL_UNUSED static double
+negative_NaNd ()
+{
+  /* 'volatile' works around a GCC bug:
+     <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111655>  */
+  double volatile nan = NaNd ();
+  return (signbit (nan) ? nan : - nan);
+}
+
+
+/* Returns a quiet 'long double' NaN with sign bit == 0.  */
+_GL_UNUSED static long double
+positive_NaNl ()
+{
+  /* 'volatile' works around a GCC bug:
+     <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111655>  */
+  long double volatile nan = NaNl ();
+  return (signbit (nan) ? - nan : nan);
+}
+
+/* Returns a quiet 'long double' NaN with sign bit == 1.  */
+_GL_UNUSED static long double
+negative_NaNl ()
+{
+  /* 'volatile' works around a GCC bug:
+     <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111655>  */
+  long double volatile nan = NaNl ();
+  return (signbit (nan) ? nan : - nan);
+}
+
+
+#endif /* _SIGNED_NAN_H */