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Introduce new private API function _PyLong_AsScaledDouble. Not used yet,

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but will be the foundation for Good Things:
+ Speed PyLong_AsDouble.
+ Give PyLong_AsDouble the ability to detect overflow.
+ Make true division of long/long nearly as accurate as possible (no
  spurious infinities or NaNs).
+ Return non-insane results from math.log and math.log10 when passing a
  long that can't be approximated by a double better than HUGE_VAL.
This commit is contained in:
Tim Peters 2001-09-04 02:50:49 +00:00
parent 37a309db70
commit a1c1b0f468
2 changed files with 61 additions and 0 deletions
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9
Include/longobject.h
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@ -18,6 +18,15 @@ extern DL_IMPORT(PyObject *) PyLong_FromUnsignedLong(unsigned long);
extern DL_IMPORT(PyObject *) PyLong_FromDouble(double);
extern DL_IMPORT(long) PyLong_AsLong(PyObject *);
extern DL_IMPORT(unsigned long) PyLong_AsUnsignedLong(PyObject *);
/* _PyLong_AsScaledDouble returns a double x and an exponent e such that
the true value is approximately equal to x * 2**(SHIFT*e). e is >= 0.
x is 0.0 if and only if the input is 0 (in which case, e and x are both
zeroes). Overflow is impossible. Note that the exponent returned must
be multiplied by SHIFT! There may not be enough room in an int to store
e*SHIFT directly. */
extern DL_IMPORT(double) _PyLong_AsScaledDouble(PyObject *vv, int *e);
extern DL_IMPORT(double) PyLong_AsDouble(PyObject *);
extern DL_IMPORT(PyObject *) PyLong_FromVoidPtr(void *);
extern DL_IMPORT(void *) PyLong_AsVoidPtr(PyObject *);