[FFmpeg-devel] [PATCH][WIP] lavc/cbrt_tablegen: speed up tablegen

Ganesh Ajjanagadde gajjanagadde at gmail.com
Fri Jan 1 16:52:20 CET 2016


On Fri, Jan 1, 2016 at 7:51 AM, Ronald S. Bultje <rsbultje at gmail.com> wrote:
> Hi,
>
> On Fri, Jan 1, 2016 at 10:46 AM, Ganesh Ajjanagadde <gajjanagadde at gmail.com>
> wrote:
>>
>> On Fri, Jan 1, 2016 at 7:43 AM, Ronald S. Bultje <rsbultje at gmail.com>
>> wrote:
>> > Hi,
>> >
>> > On Fri, Jan 1, 2016 at 10:40 AM, Ganesh Ajjanagadde
>> > <gajjanagadde at gmail.com>
>> > wrote:
>> >>
>> >> On Fri, Jan 1, 2016 at 6:54 AM, Ronald S. Bultje <rsbultje at gmail.com>
>> >> wrote:
>> >> > Hi,
>> >> >
>> >> > On Thu, Dec 31, 2015 at 9:55 PM, Ganesh Ajjanagadde
>> >> > <gajjanagadde at gmail.com>
>> >> > wrote:
>> >> >>
>> >> >> This exploits an approach based on the sieve of Eratosthenes, a
>> >> >> popular
>> >> >> method for generating prime numbers.
>> >> >>
>> >> >> Tables are identical to previous ones.
>> >> >>
>> >> >> Tested with FATE. Does not work yet with --enable-hardcoded-tables
>> >> >> due
>> >> >> to the union and lack of proper WRITE_ARRAY for it. Want to get
>> >> >> feedback
>> >> >> on this; if we always dynamically init it this won't need
>> >> >> addressing.
>> >> >
>> >> >
>> >> > I think you're getting ahead of yourself here. Assume for now that
>> >> > the
>> >> > hardcoded-tables feature will continue to exist for a while.
>> >>
>> >> I was referring to just this one, not to the question in general.
>> >
>> >
>> > I was also referring to this case specifically. Assume, for now, that
>> > hardcoded tables for this specific case, will continue to exist.
>>
>> Then defend it technically please. For instance, you have not
>> addressed the fundamental amortization of table init cost.
>
>
> No. It is the status quo, and remains that until it changes. That's why it's
> called the status quo. I've encouraged you several times to have this debate
> in the open, but you keep jumping away when that comes up.

What is this if not "open"? Where does this "jumping away" come from?
Please refrain from baseless comments.

>
> Ronald


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