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Additional tests for math.pow, and extra special-case

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handling code in math.pow, in the hope of making all
tests pass on the alpha Tru64 buildbot.
This commit is contained in:
Mark Dickinson 2008-04-19 18:51:48 +00:00
parent c7bef37402
commit e941d97d12
2 changed files with 135 additions and 10 deletions
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11
Modules/mathmodule.c
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@ -513,6 +513,7 @@ math_pow(PyObject *self, PyObject *args)
{
PyObject *ox, *oy;
double r, x, y;
int y_is_odd;
if (! PyArg_UnpackTuple(args, "pow", 2, 2, &ox, &oy))
return NULL;
@ -523,6 +524,16 @@ math_pow(PyObject *self, PyObject *args)
/* 1**x and x**0 return 1., even if x is a NaN or infinity. */
if (x == 1.0 || y == 0.0)
return PyFloat_FromDouble(1.);
/* inf ** (nonzero, non-NaN) is one of +-0, +-infinity */
if (Py_IS_INFINITY(x) && !Py_IS_NAN(y)) {
y_is_odd = Py_IS_FINITE(y) && fmod(fabs(y), 2.0) == 1.0;
if (y > 0.)
r = y_is_odd ? x : fabs(x);
else
r = y_is_odd ? copysign(0., x) : 0.;
return PyFloat_FromDouble(r);
}
errno = 0;
PyFPE_START_PROTECT("in math_pow", return 0);
r = pow(x, y);