Hi Bjorn,
The retain stack is used to implement the 'dip' combinator.
Slava
On Thu, May 15, 2014 at 1:46 PM, Björn Lindqvist <[email protected]> wrote:
> Hi everyone,
>
> I've been walking around in Factors VM for a while and there is a lot
> of usages and references to "the retain stack." But I can't for my
> life figure out what its purpose is or why anyone ever would want one
> when there is a perfectly good data stack already available.
>
> I only found these two posts by Slava Pestov about it:
>
>
> http://article.gmane.org/gmane.comp.lang.factor.general/1931/match=retain+stack
>
> http://factor-language.blogspot.se/2010/07/overhauling-factors-c-library-interface.html
>
> "In the future, I intend on using GC maps at call sites of Factor
> words as well, instead of spilling temporary values to the retain
> stack; then I can eliminate the retain stack altogether, freeing up a
> register. After this is done the data stack will only be used to pass
> parameters between words, and not to store temporaries within a word.
> This will allow more values to be unboxed in more situations, and it
> will improve accuracy of compiler analyses."
>
> So the retain stack is useless? Freeing up a whole register sounds
> like it should be great for performance, at least on 32 bit x86.
>
>
> --
> mvh/best regards Björn Lindqvist
>
>
> ------------------------------------------------------------------------------
> "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE
> Instantly run your Selenium tests across 300+ browser/OS combos.
> Get unparalleled scalability from the best Selenium testing platform
> available
> Simple to use. Nothing to install. Get started now for free."
> http://p.sf.net/sfu/SauceLabs
> _______________________________________________
> Factor-talk mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/factor-talk
>
------------------------------------------------------------------------------
"Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE
Instantly run your Selenium tests across 300+ browser/OS combos.
Get unparalleled scalability from the best Selenium testing platform available
Simple to use. Nothing to install. Get started now for free."
http://p.sf.net/sfu/SauceLabs
_______________________________________________
Factor-talk mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/factor-talk
