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https://github.com/python/cpython
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7a3b03509e
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>
63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
// Symbols and macros to supply platform-independent interfaces to mathematical
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// functions and constants.
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#ifndef Py_PYMATH_H
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#define Py_PYMATH_H
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/* High precision definition of pi and e (Euler)
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* The values are taken from libc6's math.h.
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*/
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#ifndef Py_MATH_PIl
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#define Py_MATH_PIl 3.1415926535897932384626433832795029L
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#endif
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#ifndef Py_MATH_PI
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#define Py_MATH_PI 3.14159265358979323846
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#endif
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#ifndef Py_MATH_El
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#define Py_MATH_El 2.7182818284590452353602874713526625L
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#endif
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#ifndef Py_MATH_E
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#define Py_MATH_E 2.7182818284590452354
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#endif
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/* Tau (2pi) to 40 digits, taken from tauday.com/tau-digits. */
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#ifndef Py_MATH_TAU
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#define Py_MATH_TAU 6.2831853071795864769252867665590057683943L
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#endif
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// Py_IS_NAN(X)
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// Return 1 if float or double arg is a NaN, else 0.
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#define Py_IS_NAN(X) isnan(X)
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// Py_IS_INFINITY(X)
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// Return 1 if float or double arg is an infinity, else 0.
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#define Py_IS_INFINITY(X) isinf(X)
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// Py_IS_FINITE(X)
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// Return 1 if float or double arg is neither infinite nor NAN, else 0.
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#define Py_IS_FINITE(X) isfinite(X)
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// Py_INFINITY: Value that evaluates to a positive double infinity.
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#ifndef Py_INFINITY
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# define Py_INFINITY ((double)INFINITY)
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#endif
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/* Py_HUGE_VAL should always be the same as Py_INFINITY. But historically
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* this was not reliable and Python did not require IEEE floats and C99
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* conformity. Prefer Py_INFINITY for new code.
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*/
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#ifndef Py_HUGE_VAL
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# define Py_HUGE_VAL HUGE_VAL
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#endif
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/* Py_NAN: Value that evaluates to a quiet Not-a-Number (NaN). The sign is
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* undefined and normally not relevant, but e.g. fixed for float("nan").
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*/
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#if !defined(Py_NAN)
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# define Py_NAN ((double)NAN)
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#endif
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#endif /* Py_PYMATH_H */
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