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bpo-46640: Py_NAN now uses the C99 NAN constant #31134

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Merged
vstinner merged 2 commits into from
Feb 6, 2022
Merged

bpo-46640: Py_NAN now uses the C99 NAN constant #31134

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bpo-46640: Py_NAN now uses the C99 NAN constant
vstinner Feb 4, 2022
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Update Py_NAN comment
vstinner Feb 6, 2022
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Update Py_NAN comment
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@vstinner
vstinner committed Feb 6, 2022
commit 4591295dd19a31015790571dbaa3c6f35c79b085
7 changes: 3 additions & 4 deletions Include/pymath.h
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Expand Up @@ -51,16 +51,15 @@
#endif

/* Py_NAN
* A value that evaluates to a NaN. On IEEE 754 platforms INF*0 or
* INF/INF works. Define Py_NO_NAN in pyconfig.h if your platform
* doesn't support NaNs.
* A value that evaluates to a quiet Not-a-Number (NaN).
* Define Py_NO_NAN in pyconfig.h if your platform doesn't support NaNs.
*/
#if !defined(Py_NAN) && !defined(Py_NO_NAN)
# if _Py__has_builtin(__builtin_nan)
// Built-in implementation of the ISO C99 function nan(): quiet NaN.
# define Py_NAN (__builtin_nan(""))
#else
// Use C99 NAN constant: quiet Not-A-Number (when supported).
// Use C99 NAN constant: quiet Not-A-Number.
// NAN is a float, Py_NAN is a double: cast to double.
# define Py_NAN ((double)NAN)
# endif
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