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Re: Register VM WIP
From: |
Andy Wingo |
Subject: |
Re: Register VM WIP |
Date: |
Wed, 16 May 2012 17:01:40 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.4 (gnu/linux) |
Hi Stefan,
On Fri 11 May 2012 22:29, Stefan Israelsson Tampe <address@hidden> writes:
> 1. What about growing stacks any coments if they will be easier to manage
> for this setup. Can one copy the C stack logic?
Having a fixed-size frame means that it's easier to have disjoint
stacks, since a register VM addresses operands relative to the frame
pointer and not the stack pointer. I hope to be able to decrease our
default stack size, and allow it instead to grow dynamically.
> 2. Is there an instruction that does what call does but can be used for tail
> call's
> when it needs it e.g. the code
> for (n = 0; n < nargs; n++)
> LOCAL_SET (n, old_fp[ip[4 + n]]);
> that is missing for the tail code
This is another advantage of wip-rtl. In it, the compiler is
responsible for shuffling tail arguments. It can do a parallel move
possibly without shuffling args to the top of the stack. Then tail-call
just sets a new procedure and jumps to its entry.
> 3. I would appriciate if the frame is always below say 256 SCM:s of the fp
> stack limit
> that way when preparing tail calling one doesn't usally need to check if the
> argument fit's
> when issuing a tail call.
See above :)
> 4. I think the logic code hook I recently investigated could easily fit into
> this VM engine with
> using similar techniques as I described in previous mails.
I'm still working back through the mails; remind me again if it seems I
overlooked this mail.
Cheers,
Andy
--
http://wingolog.org/
- Register VM WIP, Andy Wingo, 2012/05/11
- Re: Register VM WIP, Stefan Israelsson Tampe, 2012/05/11
- Re: Register VM WIP,
Andy Wingo <=
- Re: Register VM WIP, Ludovic Courtès, 2012/05/14
- Re: Register VM WIP, Andrew Gwozdziewycz, 2012/05/14
- Re: Register VM WIP, Andy Wingo, 2012/05/15
- Re: Register VM WIP, Noah Lavine, 2012/05/15
- Re: Register VM WIP, Mark H Weaver, 2012/05/16
- Re: Register VM WIP, Andy Wingo, 2012/05/16
- Re: Register VM WIP, Mark H Weaver, 2012/05/16
- Re: Register VM WIP, David Kastrup, 2012/05/16
- Re: Register VM WIP, Noah Lavine, 2012/05/16
- Re: Register VM WIP, Andy Wingo, 2012/05/16