[Numpy-discussion] OS X PPC problem with Numpy 1.3.0b1

Pauli Virtanen pav@iki...
Mon Mar 23 19:06:51 CDT 2009


Mon, 23 Mar 2009 16:52:28 -0600, Charles R Harris wrote:
[clip]
>> >  >>> y=np.longdouble(2)
>> >  >>> y
>> > 2.0
>> >  >>> y**1
>> > 2.0
>> >  >>> y**2
>> > crash
>>
>> Ok, this looks a bit tricky, I have no idea what's going on. Why does
>> it not crash with the exponent 1...
>
> I'd guess because nothing happens, the function simply returns.

Which function? The code path in question appears to be through 
@name@_power at scalarmathmodule.c.src:755, and from there it directly 
seems to go to _basic_longdouble_pow, where it calls npy_pow, which calls 
system's powl. (Like so on my system, verified with gdb.)

I don't see branches testing for exponent 1, so this probably means that 
the crash occurs inside powl?

-- 
Pauli Virtanen



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