From: "Gregory Morrisett" <jgm@CS.Cornell.EDU>
To: "Berke Durak" <berke@altern.org>,
"Markus Mottl" <markus@oefai.at>, <caml-list@inria.fr>
Subject: RE: [Caml-list] Turning off type-checking
Date: Mon, 13 May 2002 23:10:23 -0400 [thread overview]
Message-ID: <706871B20764CD449DB0E8E3D81C4D4301EE6D43@opus.cs.cornell.edu> (raw)
> Could the type experts on this list confirm or deny that :
> - For ``classical'' types, type-checking amounts to
> term unification.
> - Term unification can be done in worst-case linear-time.
> - Ocaml's unification algorithm is worst-case suboptimal.
> - This explains the ``awful amount of time'' needed for
> type checking.
Well, type-checking ML involves more than term unification -- the
worst case complexity is something truly horrible (EXP-time).
Having said this, for most programs, the worst-case complexity
rarely, if ever arises in "natural" code. (I've not run into
it...)
So, I'd actually be surprised if there was any significant speedup
obtained by eliminating the type-inference from the compilation
path.
-Greg
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next reply other threads:[~2002-05-14 3:10 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-14 3:10 Gregory Morrisett [this message]
2002-05-14 7:10 ` Francois Pottier
2002-05-14 7:56 ` eijiro_sumii
2002-05-14 12:51 ` Markus Mottl
2002-05-15 19:42 ` John Max Skaller
2002-05-15 21:02 ` Markus Mottl
2002-05-14 8:20 ` Alain Frisch
2002-05-14 10:33 ` Christophe Raffalli
2002-05-14 13:39 ` Oliver Bandel
2002-05-15 6:00 ` malc
-- strict thread matches above, loose matches on Subject: below --
2002-05-13 13:31 Markus Mottl
2002-05-13 14:33 ` Lauri Alanko
2002-05-13 21:47 ` Berke Durak
2002-05-14 13:33 ` Oliver Bandel
2002-05-14 14:33 ` Jacques Garrigue
2002-05-14 23:17 ` Markus Mottl
2002-05-14 23:34 ` John Prevost
2002-05-15 8:51 ` Jacques Garrigue
2002-05-15 22:22 ` John Max Skaller
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