--- /dev/null
+! { dg-do run }
+!
+program test
+ use, intrinsic :: iso_c_binding
+ use, intrinsic :: ieee_arithmetic
+ implicit none
+
+ real(kind=c_float) :: x
+ real(kind=c_double) :: y
+ real(kind=c_long_double) :: z
+
+ if (ieee_support_nan(x)) then
+ x = ieee_value(x, ieee_signaling_nan)
+ if (ieee_class(x) /= ieee_signaling_nan) stop 100
+ if (.not. ieee_is_nan(x)) stop 101
+
+ x = ieee_value(x, ieee_quiet_nan)
+ if (ieee_class(x) /= ieee_quiet_nan) stop 103
+ if (.not. ieee_is_nan(x)) stop 104
+ end if
+
+ if (ieee_support_nan(y)) then
+ y = ieee_value(y, ieee_signaling_nan)
+ if (ieee_class(y) /= ieee_signaling_nan) stop 100
+ if (.not. ieee_is_nan(y)) stop 101
+
+ y = ieee_value(y, ieee_quiet_nan)
+ if (ieee_class(y) /= ieee_quiet_nan) stop 103
+ if (.not. ieee_is_nan(y)) stop 104
+ end if
+
+ if (ieee_support_nan(z)) then
+ z = ieee_value(z, ieee_signaling_nan)
+ if (ieee_class(z) /= ieee_signaling_nan) stop 100
+ if (.not. ieee_is_nan(z)) stop 101
+
+ z = ieee_value(z, ieee_quiet_nan)
+ if (ieee_class(z) /= ieee_quiet_nan) stop 103
+ if (.not. ieee_is_nan(z)) stop 104
+ end if
+
+end program test
--- /dev/null
+/* Fallback implementation of issignaling macro.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ Contributed by Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>
+
+This file is part of the GNU Fortran runtime library (libgfortran).
+
+Libgfortran 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.
+
+Libgfortran 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
+
+#include "libgfortran.h"
+
+/* This header provides an implementation of the type-generic issignaling macro.
+ Some points of note:
+
+ - This header is only included if the issignaling macro is not defined.
+ - All targets for which Fortran IEEE modules are supported currently have
+ the high-order bit of the NaN mantissa clear for signaling (and set
+ for quiet), as recommended by IEEE.
+ - We use the __*_IS_IEC_60559__ macros to make sure we only deal with formats
+ we know. For other floating-point formats, we consider all NaNs as quiet.
+
+ */
+
+typedef union
+{
+ float value;
+ uint32_t word;
+} ieee_float_shape_type;
+
+static inline int
+__issignalingf (float x)
+{
+#if __FLT_IS_IEC_60559__
+ uint32_t xi;
+ ieee_float_shape_type u;
+
+ u.value = x;
+ xi = u.word;
+
+ xi ^= 0x00400000;
+ return (xi & 0x7fffffff) > 0x7fc00000;
+#else
+ return 0;
+#endif
+}
+
+
+typedef union
+{
+ double value;
+ uint64_t word;
+} ieee_double_shape_type;
+
+static inline int
+__issignaling (double x)
+{
+#if __DBL_IS_IEC_60559__
+ ieee_double_shape_type u;
+ uint64_t xi;
+
+ u.value = x;
+ xi = u.word;
+
+ xi ^= UINT64_C (0x0008000000000000);
+ return (xi & UINT64_C (0x7fffffffffffffff)) > UINT64_C (0x7ff8000000000000);
+#else
+ return 0;
+#endif
+}
+
+
+#if __LDBL_DIG__ == __DBL_DIG__
+
+/* Long double is the same as double. */
+static inline int
+__issignalingl (long double x)
+{
+ return __issignaling (x);
+}
+
+#elif (__LDBL_DIG__ == 18) && __LDBL_IS_IEC_60559__
+
+/* Long double is x86 extended type. */
+
+typedef union
+{
+ long double value;
+ struct
+ {
+#if __FLOAT_WORD_ORDER == __BIG_ENDIAN
+ int sign_exponent:16;
+ unsigned int empty:16;
+ uint32_t msw;
+ uint32_t lsw;
+#elif __FLOAT_WORD_ORDER == __LITTLE_ENDIAN
+ uint32_t lsw;
+ uint32_t msw;
+ int sign_exponent:16;
+ unsigned int empty:16;
+#endif
+ } parts;
+} ieee_long_double_shape_type;
+
+static inline int
+__issignalingl (long double x)
+{
+ int ret;
+ uint32_t exi, hxi, lxi;
+ ieee_long_double_shape_type u;
+
+ u.value = x;
+ exi = u.parts.sign_exponent;
+ hxi = u.parts.msw;
+ lxi = u.parts.lsw;
+
+ /* Pseudo numbers on x86 are always signaling. */
+ ret = (exi & 0x7fff) && ((hxi & 0x80000000) == 0);
+
+ hxi ^= 0x40000000;
+ hxi |= (lxi | -lxi) >> 31;
+ return ret || (((exi & 0x7fff) == 0x7fff) && (hxi > 0xc0000000));
+}
+
+#elif (__LDBL_DIG__ = 33) && __LDBL_IS_IEC_60559__
+
+/* Long double is 128-bit type. */
+
+typedef union
+{
+ long double value;
+ struct
+ {
+#if __FLOAT_WORD_ORDER == __BIG_ENDIAN
+ uint64_t msw;
+ uint64_t lsw;
+#elif __FLOAT_WORD_ORDER == __LITTLE_ENDIAN
+ uint64_t lsw;
+ uint64_t msw;
+#endif
+ } parts64;
+} ieee854_long_double_shape_type;
+
+static inline int
+__issignalingl (long double x)
+{
+ uint64_t hxi, lxi;
+ ieee854_long_double_shape_type u;
+
+ u.value = x;
+ hxi = u.parts64.msw;
+ lxi = u.parts64.lsw;
+
+ hxi ^= UINT64_C (0x0000800000000000);
+ hxi |= (lxi | -lxi) >> 63;
+ return (hxi & UINT64_C (0x7fffffffffffffff)) > UINT64_C (0x7fff800000000000);
+}
+
+#else
+
+static inline int
+__issignalingl (long double x)
+{
+ return 0;
+}
+
+#endif
+
+
+#if __FLT128_IS_IEC_60559__
+
+/* We have a _Float128 type. */
+
+typedef union
+{
+ __float128 value;
+ struct
+ {
+#if __FLOAT_WORD_ORDER == __BIG_ENDIAN
+ uint64_t msw;
+ uint64_t lsw;
+#elif __FLOAT_WORD_ORDER == __LITTLE_ENDIAN
+ uint64_t lsw;
+ uint64_t msw;
+#endif
+ } parts64;
+} ieee854_float128_shape_type;
+
+static inline int
+__issignalingf128 (__float128 x)
+{
+ uint64_t hxi, lxi;
+ ieee854_float128_shape_type u;
+
+ u.value = x;
+ hxi = u.parts64.msw;
+ lxi = u.parts64.lsw;
+
+ hxi ^= UINT64_C (0x0000800000000000);
+ hxi |= (lxi | -lxi) >> 63;
+ return (hxi & UINT64_C (0x7fffffffffffffff)) > UINT64_C (0x7fff800000000000);
+}
+
+#endif
+
+
+/* Define the type-generic macro based on the functions above. */
+
+#if __FLT128_IS_IEC_60559__
+# define issignaling(X) \
+ _Generic ((X), \
+ __float128: __issignalingf128, \
+ float: __issignalingf, \
+ double: __issignaling, \
+ long double: __issignalingl)(X)
+#else
+# define issignaling(X) \
+ _Generic ((X), \
+ float: __issignalingf, \
+ double: __issignaling, \
+ long double: __issignalingl)(X)
+#endif
+
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