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gh-104263: Rely on Py_NAN and introduce Py_INFINITY (GH-104202)

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This PR removes `_Py_dg_stdnan` and `_Py_dg_infinity` in favour of
using the standard `NAN` and `INFINITY` macros provided by C99.
This change has the side-effect of fixing a bug on MIPS where the
hard-coded value used by `_Py_dg_stdnan` gave a signalling NaN
rather than a quiet NaN.
---------

Co-authored-by: Mark Dickinson <dickinsm@gmail.com>
This commit is contained in:
Sebastian Berg 2023-05-10 18:44:52 +02:00 • committed by GitHub
parent a7a2dbbf72
commit 7a3b03509e
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12 changed files with 44 additions and 198 deletions
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25
Include/pymath.h
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@ -39,27 +39,24 @@
// Return 1 if float or double arg is neither infinite nor NAN, else 0.
#define Py_IS_FINITE(X) isfinite(X)
/* HUGE_VAL is supposed to expand to a positive double infinity. Python
* uses Py_HUGE_VAL instead because some platforms are broken in this
* respect. We used to embed code in pyport.h to try to worm around that,
* but different platforms are broken in conflicting ways. If you're on
* a platform where HUGE_VAL is defined incorrectly, fiddle your Python
* config to #define Py_HUGE_VAL to something that works on your platform.
// Py_INFINITY: Value that evaluates to a positive double infinity.
#ifndef Py_INFINITY
# define Py_INFINITY ((double)INFINITY)
#endif
/* Py_HUGE_VAL should always be the same as Py_INFINITY. But historically
* this was not reliable and Python did not require IEEE floats and C99
* conformity. Prefer Py_INFINITY for new code.
*/
#ifndef Py_HUGE_VAL
# define Py_HUGE_VAL HUGE_VAL
#endif
// Py_NAN: Value that evaluates to a quiet Not-a-Number (NaN).
/* Py_NAN: Value that evaluates to a quiet Not-a-Number (NaN). The sign is
* undefined and normally not relevant, but e.g. fixed for float("nan").
*/
#if !defined(Py_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.
// NAN is a float, Py_NAN is a double: cast to double.
# define Py_NAN ((double)NAN)
# endif
#endif
#endif /* Py_PYMATH_H */