From: Stefan Monnier <monnier@iro.umontreal.ca>
To: help-gnu-emacs@gnu.org
Subject: Re: Always using let*
Date: Mon, 15 Sep 2014 08:31:35 -0400 [thread overview]
Message-ID: <jwvegvdgje8.fsf-monnier+gmane.emacs.help@gnu.org> (raw)
In-Reply-To: 87mwa1lhb1.fsf@kuiper.lan.informatimago.com
> But if you have side-effect free expressions, (or at least, provably
> independent ones), then they could be evaluated in parallel despite the
> left-to-right rule.
Same holds for let* or pretty much anything else for that matter: if
some analysis can prove that it can be done in parallel, well, then
unsurprisingly it can be performed in parallel. But it's not the
"parallel binding" semantics of `let' that lets you do that.
While some details of language semantics can make analysis of code
easier for that (e.g. the non-aliasing constraints on arguments in
Fortran), I've never heard of anyone being able to use the
parallel-binding of "let" for that.
So, I stand by my claim: it's an Urban Legend.
Stefan
next prev parent reply other threads:[~2014-09-15 12:31 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-14 19:46 Always using let* Cecil Westerhof
2014-09-14 21:25 ` Drew Adams
2014-09-15 16:15 ` Drew Adams
[not found] ` <mailman.8924.1410797740.1147.help-gnu-emacs@gnu.org>
2014-09-15 18:01 ` Cecil Westerhof
2014-09-15 22:20 ` Emanuel Berg
2014-09-16 12:05 ` Cecil Westerhof
2014-09-16 22:40 ` Emanuel Berg
2014-09-18 17:02 ` Cecil Westerhof
2014-09-18 21:05 ` Emanuel Berg
2014-09-16 14:23 ` sokobania.01
2014-09-16 16:41 ` Drew Adams
2014-09-16 20:49 ` Stefan Monnier
2014-09-16 22:45 ` Emanuel Berg
[not found] ` <mailman.8998.1410901776.1147.help-gnu-emacs@gnu.org>
2014-09-16 22:48 ` Emanuel Berg
2014-09-17 1:09 ` Stefan Monnier
2014-09-17 1:18 ` Emanuel Berg
2014-09-14 21:40 ` Joe Fineman
[not found] ` <mailman.8868.1410729956.1147.help-gnu-emacs@gnu.org>
2014-09-14 21:41 ` Emanuel Berg
2014-09-14 22:11 ` Cecil Westerhof
2014-09-14 22:56 ` Drew Adams
2014-09-14 22:41 ` Stefan Monnier
2014-09-14 23:06 ` Drew Adams
[not found] ` <mailman.8871.1410736002.1147.help-gnu-emacs@gnu.org>
2014-09-15 0:47 ` Emanuel Berg
2014-09-15 2:12 ` Pascal J. Bourguignon
2014-09-15 2:22 ` Stefan Monnier
2014-09-15 2:59 ` Pascal J. Bourguignon
2014-09-15 12:31 ` Stefan Monnier [this message]
2014-09-15 16:15 ` Drew Adams
2014-09-15 19:05 ` Stefan Monnier
[not found] ` <mailman.8930.1410808006.1147.help-gnu-emacs@gnu.org>
2014-09-15 22:28 ` Emanuel Berg
2014-09-16 0:38 ` Pascal J. Bourguignon
2014-09-15 13:14 ` Barry Margolin
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