On Jan 25, 1:32 pm, Arnaud Delobelle <arno...@googlemail.com> wrote:
> Steve Howell <showel...@yahoo.com> writes:
>
> [...]
>
> > My algorithm does exactly N pops and roughly N list accesses, so I
> > would be going from N*N + N to N + N log N if switched to blist.
>
> Can you post your algorithm? It would be interesting to have a concrete
> use case to base this discussion on.
>
It is essentially this, in list_ass_slice:
if (d < 0) { /* Delete -d items */
if (ilow == 0) {
a->popped -= d;
a->ob_item -= d * sizeof(PyObject *);
list_resize(a, Py_SIZE(a));
}
else {
memmove(&item[ihigh+d], &item[ihigh],
(Py_SIZE(a) - ihigh)*sizeof(PyObject *));
list_resize(a, Py_SIZE(a) + d);
}
item = a->ob_item;
}
I am still working through the memory management issues, but when I
have a complete working patch, I will give more detail.
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