From: Stefan Israelsson Tampe <stefan.itampe@gmail.com>
To: guile-devel <guile-devel@gnu.org>
Subject: Fwd: GNU Guile 2.9.9 Released [beta]
Date: Tue, 14 Jan 2020 12:43:17 +0100 [thread overview]
Message-ID: <CAGua6m0KjXRbRahTTmeUCNESRJZiyzT7p7V4VXHQF3sW5Jtr5g@mail.gmail.com> (raw)
In-Reply-To: <CAGua6m3+mL-1mq0iot1+xvkgkC-_jnhX03uGpOxQkwk0iv12Vw@mail.gmail.com>
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---------- Forwarded message ---------
From: Stefan Israelsson Tampe <stefan.itampe@gmail.com>
Date: Tue, Jan 14, 2020 at 12:43 PM
Subject: Re: GNU Guile 2.9.9 Released [beta]
To: Andy Wingo <wingo@pobox.com>
Thanks!
Phew!
I think that for an f, a direct function application need not to be counted
as a position. Only when you use f in a higher order manner
demands that you count this. E.g. (g f), (return f)
Regards
Stefan
On Tue, Jan 14, 2020 at 12:16 PM Andy Wingo <wingo@pobox.com> wrote:
> On Mon 13 Jan 2020 22:32, Stefan Israelsson Tampe <stefan.itampe@gmail.com>
> writes:
>
> > In current guile (eq? f f) = #f for a procedure f. Try:
>
> Note that procedure equality is explicitly unspecified by R6RS. Guile's
> declarative modules optimization took advantage of this to eta-expand
> references to declaratively-bound top-level lambda expressions. This
> unlocks the "well-known" closure optimizations: closure elision,
> contification, and so on.
>
> However, the intention with the eta expansion was really to prevent the
>
> (module-add! mod 'foo foo)
>
> from making the procedure not-well-known. If that's the only reference
> to `foo' outside the operator position, procedure identity for `foo' is
> kept, because it's only accessed outside the module. But then I
> realized thanks to your mail (and the three or four times that people
> stumbled against this beforehand) that we can preserve the optimizations
> and peoples' intuitions about procedure equality if we restrict
> eta-expansion to those procedures that are only referenced by value in
> at most a single position.
>
> It would be best to implement the eta-expansion after peval; doing it
> where we do leaves some optimization opportunities on the table. But I
> have implemented this change in git and it should fix this issue.
>
> Comparative benchmark results:
>
>
> https://wingolog.org/pub/guile-2.9.7-vs-guile-2.9.9-with-eq-change-microbenchmarks.png
>
> Regards,
>
> Andy
>
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next prev parent reply other threads:[~2020-01-14 11:43 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-13 8:39 GNU Guile 2.9.9 Released [beta] Andy Wingo
2020-01-13 8:44 ` Andy Wingo
2020-01-13 17:26 ` John Cowan
2020-01-13 23:09 ` bug#39118: " John Cowan
2020-01-20 16:35 ` bug#39118: Segfault while building on 64-bit Cygwin Ludovic Courtès
2020-01-20 16:38 ` John Cowan
2020-01-20 17:22 ` bug#39118: " Mike Gran via Bug reports for GUILE, GNU's Ubiquitous Extension Language
2020-02-06 10:53 ` Andy Wingo
2020-02-07 4:56 ` Charles Stanhope
2020-02-14 17:46 ` Charles Stanhope
2020-02-15 17:58 ` Marco Atzeri
2020-02-16 23:23 ` Mike Gran
2020-02-16 23:24 ` John Cowan
2020-02-17 1:08 ` Charles Stanhope
2020-02-17 19:27 ` Charles Stanhope
2020-02-17 21:05 ` Andy Wingo
2020-01-21 9:01 ` Ludovic Courtès
2020-01-21 18:40 ` bug#39118: " szgyg
2020-01-21 21:53 ` John Cowan
2020-01-21 21:37 ` John Cowan
2020-01-23 20:35 ` Ludovic Courtès
2020-01-24 14:36 ` John Cowan
2020-01-25 13:51 ` Ludovic Courtès
2020-01-25 15:54 ` John Cowan
2020-01-31 14:23 ` bug#39118: " John Cowan
2020-02-03 22:11 ` szgyg
2020-02-05 21:11 ` John Cowan
2020-02-05 22:42 ` szgyg
2020-01-13 21:32 ` GNU Guile 2.9.9 Released [beta] Stefan Israelsson Tampe
2020-01-13 21:33 ` Stefan Israelsson Tampe
2020-01-14 9:57 ` Stefan Israelsson Tampe
2020-01-14 11:16 ` Andy Wingo
[not found] ` <CAGua6m3+mL-1mq0iot1+xvkgkC-_jnhX03uGpOxQkwk0iv12Vw@mail.gmail.com>
2020-01-14 11:43 ` Stefan Israelsson Tampe [this message]
2020-01-14 12:18 ` Mikael Djurfeldt
2020-01-14 13:25 ` Stefan Israelsson Tampe
2020-01-14 14:32 ` Andy Wingo
2020-01-14 14:47 ` Stefan Israelsson Tampe
2020-01-14 16:15 ` Andy Wingo
2020-01-14 16:36 ` Stefan Israelsson Tampe
2020-01-14 17:56 ` Stefan Israelsson Tampe
2020-01-14 16:03 ` Mikael Djurfeldt
[not found] ` <CAGua6m2cm2iFTf6EB4MuDR4qNDJ1kt1EjwRCBgLKS+qxncxp+w@mail.gmail.com>
2020-01-14 16:36 ` Fwd: " Stefan Israelsson Tampe
2020-01-14 16:47 ` Mikael Djurfeldt
2020-01-14 17:21 ` Taylan Kammer
2020-01-14 17:27 ` Stefan Israelsson Tampe
2020-01-14 20:54 ` Andy Wingo
2020-01-14 20:13 ` Stefan Israelsson Tampe
2020-01-14 21:17 ` Andy Wingo
2020-01-14 21:48 ` Stefan Israelsson Tampe
2020-01-15 19:58 ` Andy Wingo
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