[pypy-dev] More on optimization
pedronis at bluewin.ch
Sat Nov 6 19:47:58 CET 2004
Armin Rigo wrote:
> Hi Samuele,
> On Thu, Nov 04, 2004 at 03:51:50PM +0100, Samuele Pedroni wrote:
>>>it depends on how you implement things, realloc needs to be expressed as
>>>alloc and copy but I don't see what force you to incapsulate the array
>>>in an extra layer object.
>>oops, sorry now I see, you want RPython lists to be lists, that's
>>probably different that what we wanted originally.
> No, I'm thinking about the following problem: suppose that an RPython list is
> meant to represent an expensively resizeable array.
that what I was implicitly thinking with "be lists". My point anyway was
simply that for Java the first relevant thing is to dinstiguish
constant-size lists (the code in listobject uses such things) vs.
variable size lists, and both then have natural reprs. In a more subtle
approach also lists that have always just _one_ reference to them in the
whole heap (and are not passed as parameters perhaps) can likely also be
implemented with a direct array reference.
It is true that the generalization and understanding of this kind of
criteria is what we need for general structure inlining.
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