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From: Eli Zaretskii <eliz@gnu.org>
To: "Gerd Möllmann" <gerd.moellmann@gmail.com>
Cc: eller.helmut@gmail.com, emacs-devel@gnu.org
Subject: Re: MPS image cache
Date: Sun, 05 May 2024 18:49:55 +0300	[thread overview]
Message-ID: <86ttjccl7g.fsf@gnu.org> (raw)
In-Reply-To: <m234qw8h3x.fsf@pro2.fritz.box> (message from Gerd Möllmann on Sun, 05 May 2024 16:32:02 +0200)

> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Cc: eller.helmut@gmail.com,  emacs-devel@gnu.org
> Date: Sun, 05 May 2024 16:32:02 +0200
> 
> I think it's a matter of personal priorities. It guess it can't hurt to
> say explicity what these are.
> 
> 1. Make progress fast, so that I can assess for myself if it's worth
> continuing. With an Emacs up time of ca. 8h now, I tend to think so.
> When it would reach say 5 days or so, we'd be in the realm of what
> master survives for me on macOS.
> 
> 2. Make it work for me in my personal fork (CL packages) which is macOS
> only anyway, and is basically for me alone only.
> 
> 3. GNU. And I'm neither a maintainer of anything, nor want to maintain
> anything in the GNU sense.

And my impression was that we are trying to advance on 3 most
important Emacs platforms in parallel, with the purpose of adding this
to Emacs at some point.  Apologies for my misunderstanding.

> >> >> We allocate a vector of N pointers. The N is found in the header when we
> >> >> scan it. It's the size of the MPS object we scan minus the header
> >> >> divided by how large a pointer is.
> >> >
> >> > OK, but why does the struct have to fit in a single word?
> >> 
> >> It doesn't, it the other way around. I'm using nwords - 1 for the size
> >> of the vector, and the static_assert is intended to fire if nwords - 1
> >> is not right.
> >
> > OK, then my question now is "why does it have to be nwords-1?"
> 
> I suspect that I'll answer something you don't ask again: We allocate a
> vector of N elements. We don't store N directly somewhere, but we have
> an igc_header from which we can compute N. So I compute it as nwords -
> 1. If that's not right, I static_assert, and leave it to the interested
> party to do something.

I fixed the code according to my understanding, please take a look and
tell if I missed something (since the new function does not seem to be
used yet for the two caches you mentioned, it is hard to know whether
I violated some assumptions).

Thanks.



  reply	other threads:[~2024-05-05 15:49 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-05-03  8:53 MPS image cache Gerd Möllmann
2024-05-03 10:58 ` Helmut Eller
2024-05-03 11:05   ` Po Lu
2024-05-03 11:22   ` Gerd Möllmann
2024-05-03 11:43     ` Gerd Möllmann
2024-05-03 13:24       ` Gerd Möllmann
2024-05-03 17:02         ` Gerd Möllmann
2024-05-04  4:38           ` MPS: scroll-bars (was: MPS image cache) Helmut Eller
2024-05-04  5:22             ` MPS: scroll-bars Gerd Möllmann
2024-05-04  5:29               ` Gerd Möllmann
2024-05-04  5:50             ` Po Lu
2024-05-04  6:27               ` Helmut Eller
2024-05-04  6:45                 ` Gerd Möllmann
2024-05-04  7:05                   ` Helmut Eller
2024-05-04  7:13                     ` Gerd Möllmann
2024-05-04  7:48                       ` Gerd Möllmann
2024-05-04  7:09                   ` Gerd Möllmann
2024-05-04  8:47                     ` Eli Zaretskii
2024-05-04  9:13                       ` Gerd Möllmann
2024-05-04  9:29                         ` Eli Zaretskii
2024-05-04 10:04                           ` Gerd Möllmann
2024-05-04 13:59                             ` MPS: w32 threads Eli Zaretskii
2024-05-04 14:20                               ` Gerd Möllmann
2024-05-05  8:27                                 ` Eli Zaretskii
2024-05-05  9:16                                   ` Gerd Möllmann
2024-05-05 14:39                                     ` Eli Zaretskii
2024-05-05 15:23                                       ` Gerd Möllmann
2024-05-05 15:26                                         ` Gerd Möllmann
2024-05-04  8:29                 ` MPS: scroll-bars Po Lu
2024-05-05  4:52                   ` Gerd Möllmann
2024-05-05  7:53                     ` Helmut Eller
2024-05-05  8:01                       ` Gerd Möllmann
2024-05-05  8:08                         ` Helmut Eller
2024-05-05 16:43                       ` Eli Zaretskii
2024-05-05 18:02                         ` Helmut Eller
2024-05-05 18:09                           ` Eli Zaretskii
2024-05-06 15:05                             ` Eli Zaretskii
2024-05-06 15:53                               ` Gerd Möllmann
2024-05-06 18:25                                 ` Eli Zaretskii
2024-05-07  6:07                                   ` Helmut Eller
2024-05-07 12:56                                     ` Eli Zaretskii
2024-05-07 16:27                                       ` Helmut Eller
2024-05-03 14:59     ` MPS image cache Helmut Eller
2024-05-03 15:11       ` Gerd Möllmann
2024-05-05  6:45         ` Gerd Möllmann
2024-05-05  7:02           ` Gerd Möllmann
2024-05-05  9:00             ` Eli Zaretskii
2024-05-05  9:31               ` Gerd Möllmann
2024-05-05 10:24                 ` Eli Zaretskii
2024-05-05 10:36                   ` Gerd Möllmann
2024-05-05 11:01                     ` Eli Zaretskii
2024-05-05 12:55                       ` Gerd Möllmann
2024-05-05 14:07                         ` Eli Zaretskii
2024-05-05 14:32                           ` Gerd Möllmann
2024-05-05 15:49                             ` Eli Zaretskii [this message]
2024-05-05 16:19                               ` Gerd Möllmann
2024-05-05 17:45                               ` Gerd Möllmann
2024-05-05 18:04                                 ` Eli Zaretskii
2024-05-05 18:13                                   ` Eli Zaretskii
2024-05-05 18:35                                     ` Gerd Möllmann
2024-05-05 19:18                                       ` Eli Zaretskii
2024-05-05 19:57                                         ` Gerd Möllmann
2024-05-05  8:16           ` Helmut Eller
2024-05-05  8:42             ` Gerd Möllmann
2024-05-06 14:16               ` Helmut Eller
2024-05-06 14:28                 ` Gerd Möllmann
2024-05-03 15:02     ` Helmut Eller
2024-05-04 17:51       ` Gerd Möllmann
2024-05-03 11:04 ` Eli Zaretskii
2024-05-03 11:08   ` Gerd Möllmann

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