Re: very slow archive-mode

[Kenichi Handa]

In article <address@hidden>, YAMAMOTO Mitsuharu <address@hidden> writes:

> > Also, IIUC the 8-bit bytes that are not represented as a single byte
> > and not only more numerous, but they also take up more space (they
> > used to take up just 2 bytes but now they take up what 3? 4? 5
> > bytes?).

> IIUC, it still takes up just 2 bytes by cleverly using vacant UTF-8
> area (see character.h).

Yes.

> I think code_convert_region in Emacs 22 tried to avoid the repeated
> reallocations and copies by estimating the necessary buffer size from
> the intermediate result of conversion in progress. (And there were a
> cast problem that affected its performance:
> http://lists.gnu.org/archive/html/emacs-pretest-bug/2004-12/msg00197.html)

> Does the code conversion in Emacs 23 include such estimation?

Not yet.  But it's not related to the problem of slow
set-buffer-multibyte.

---
Kenichi Handa
address@hidden