/* Macros for not-a-number.
- Copyright (C) 2007-2013 Free Software Foundation, Inc.
+ Copyright (C) 2007-2021 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
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/>. */
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+/* IBM z/OS supports both hexadecimal and IEEE floating-point formats. The
+ former does not support NaN and its isnan() implementation returns zero
+ for all values. */
+#if defined __MVS__ && defined __IBMC__ && !defined __BFP__
+# error "NaN is not supported with IBM's hexadecimal floating-point format; please re-compile with -qfloat=ieee"
+#endif
+
/* NaNf () returns a 'float' not-a-number. */
/* The Compaq (ex-DEC) C 6.4 compiler and the Microsoft MSVC 9 compiler choke
- on the expression 0.0 / 0.0. */
-#if defined __DECC || defined _MSC_VER
+ on the expression 0.0 / 0.0. The IBM XL C compiler on z/OS complains.
+ PGI 16.10 complains. */
+#if (defined __DECC || defined _MSC_VER \
+ || (defined __MVS__ && defined __IBMC__) \
+ || defined __PGI)
static float
NaNf ()
{
/* NaNd () returns a 'double' not-a-number. */
/* The Compaq (ex-DEC) C 6.4 compiler and the Microsoft MSVC 9 compiler choke
- on the expression 0.0 / 0.0. */
-#if defined __DECC || defined _MSC_VER
+ on the expression 0.0 / 0.0. The IBM XL C compiler on z/OS complains.
+ PGI 16.10 complains. */
+#if (defined __DECC || defined _MSC_VER \
+ || (defined __MVS__ && defined __IBMC__) \
+ || defined __PGI)
static double
NaNd ()
{
/* On Irix 6.5, gcc 3.4.3 can't compute compile-time NaN, and needs the
runtime type conversion.
- The Microsoft MSVC 9 compiler chokes on the expression 0.0L / 0.0L. */
+ The Microsoft MSVC 9 compiler chokes on the expression 0.0L / 0.0L.
+ The IBM XL C compiler on z/OS complains.
+ PGI 16.10 complains. */
#ifdef __sgi
static long double NaNl ()
{
double zero = 0.0;
return zero / zero;
}
-#elif defined _MSC_VER
+#elif defined _MSC_VER || (defined __MVS__ && defined __IBMC__) || defined __PGI
static long double
NaNl ()
{