bpo-46640: Py_NAN now uses the C99 NAN constant by vstinner · Pull Request #31134 · python/cpython · GitHub
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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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6 changes: 6 additions & 0 deletions Doc/whatsnew/3.11.rst
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31 changes: 10 additions & 21 deletions Include/pymath.h
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Original file line number Diff line number Diff line change
Expand Up @@ -51,29 +51,18 @@
#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 !defined(__INTEL_COMPILER)
# define Py_NAN (Py_HUGE_VAL * 0.)
# else /* __INTEL_COMPILER */
# if defined(ICC_NAN_STRICT)
#pragma float_control(push)
#pragma float_control(precise, on)
#pragma float_control(except, on)
Py_NO_INLINE static double __icc_nan()
{
return sqrt(-1.0);
}
#pragma float_control (pop)
# define Py_NAN __icc_nan()
# else /* ICC_NAN_RELAXED as default for Intel Compiler */
static const union { unsigned char buf[8]; double __icc_nan; } __nan_store = {0,0,0,0,0,0,0xf8,0x7f};
# define Py_NAN (__nan_store.__icc_nan)
# endif /* ICC_NAN_STRICT */
# endif /* __INTEL_COMPILER */
# 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.
// NAN is a float, Py_NAN is a double: cast to double.
# define Py_NAN ((double)NAN)
# endif
#endif

#endif /* Py_PYMATH_H */
4 changes: 4 additions & 0 deletions Misc/NEWS.d/next/Build/2022-02-04-21-26-50.bpo-46640.HXUmQp.rst
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