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  r77234 | mark.dickinson | 2010-01-02 14:45:40 +0000 (Sat, 02 Jan 2010) | 7 lines

  Refactor some longobject internals:  PyLong_AsDouble and _PyLong_AsScaledDouble
  (the latter renamed to _PyLong_Frexp) now use the same core code.  The
  exponent produced by _PyLong_Frexp now has type Py_ssize_t instead of the
  previously used int, and no longer needs scaling by PyLong_SHIFT.  This
  frees the math module from having to know anything about the PyLong
  implementation.  This closes issue #5576.
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This commit is contained in:
Mark Dickinson 2010-01-02 15:33:56 +00:00
parent 01f748a832
commit 6ecd9e53ce
3 changed files with 168 additions and 240 deletions
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14
Include/longobject.h
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@ -44,13 +44,13 @@ PyAPI_FUNC(PyObject *) PyLong_GetInfo(void);
/* For use by intobject.c only */
PyAPI_DATA(unsigned char) _PyLong_DigitValue[256];
/* _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. */
PyAPI_FUNC(double) _PyLong_AsScaledDouble(PyObject *vv, int *e);
/* _PyLong_Frexp returns a double x and an exponent e such that the
true value is approximately equal to x * 2**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); otherwise, 0.5 <= abs(x) < 1.0. On overflow, which is
possible if the number of bits doesn't fit into a Py_ssize_t, sets
OverflowError and returns -1.0 for x, 0 for e. */
PyAPI_FUNC(double) _PyLong_Frexp(PyLongObject *a, Py_ssize_t *e);
PyAPI_FUNC(double) PyLong_AsDouble(PyObject *);
PyAPI_FUNC(PyObject *) PyLong_FromVoidPtr(void *);