From: Xavier Leroy <xavier.leroy@inria.fr>
To: "Scott J," <jscott@planetinternet.be>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Runtime overflow and what to do
Date: Sun, 13 Oct 2002 11:25:37 +0200 [thread overview]
Message-ID: <20021013112537.J13771@pauillac.inria.fr> (raw)
In-Reply-To: <021501c270aa$ca400660$0100a8c0@janxp>; from jscott@planetinternet.be on Fri, Oct 11, 2002 at 12:17:15AM +0200
> So it is not easy, perhaps even impossible if the processor doesn't set a
> flag .
It is possible, but slow and not pretty! For example, here is Caml
code that performs integer addition and detects overflows:
exception Integer_overflow
let no_overflow_add a b =
if (a lxor b) lor (a lxor (lnot (a+b))) < 0 (* no kidding! *)
then a + b
else raise Integer_overflow
Multiplication is left as an exercise for the readers :-)
My advice would be to use bignums; they are a bit slower, but at least
you get the exact result in all cases.
- Xavier Leroy
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next prev parent reply other threads:[~2002-10-13 9:25 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-10 15:01 Scott J,
2002-10-10 15:07 ` Maxence Guesdon
2002-10-10 15:11 ` Maxence Guesdon
2002-10-10 15:21 ` Luc Maranget
2002-10-10 18:13 ` Sven LUTHER
2002-10-10 18:57 ` Xavier Leroy
2002-10-10 22:17 ` Scott J,
2002-10-11 8:00 ` Sven LUTHER
2002-10-11 10:16 ` Alessandro Baretta
2002-10-12 16:13 ` John Carr
2002-10-12 16:58 ` Sven LUTHER
2002-10-12 17:12 ` John Prevost
2002-10-13 9:31 ` Xavier Leroy
2002-10-13 9:52 ` Sven LUTHER
2002-10-13 9:57 ` Xavier Leroy
2002-10-13 10:15 ` Sven LUTHER
2002-10-13 13:25 ` John Carr
2002-10-13 9:28 ` Xavier Leroy
2002-10-14 0:56 ` Chris Hecker
2002-10-14 9:46 ` Jacques Garrigue
2002-10-14 11:02 ` Scott J,
2002-10-14 14:05 ` Tim Freeman
2002-10-14 15:32 ` Stefano Zacchiroli
2002-10-14 16:12 ` Alain Frisch
2002-10-14 16:49 ` [Caml-list] new ocaml switches (was Re: Runtime overflow and what to do) Chris Hecker
2002-10-13 9:25 ` Xavier Leroy [this message]
2002-10-13 10:04 ` [Caml-list] Runtime overflow and what to do Daniel de Rauglaudre
2002-10-13 10:29 ` Pierre Weis
2002-10-13 10:47 ` Daniel de Rauglaudre
2002-10-13 12:38 ` Pierre Weis
2002-10-13 16:14 ` Xavier Leroy
2002-10-13 17:06 ` Michel Quercia
2002-10-15 19:15 ` Pierre Weis
2002-10-15 19:25 ` Xavier Leroy
2002-10-16 8:24 ` Pierre Weis
2002-10-13 10:19 ` Pierre Weis
2002-10-11 8:02 ` Sven LUTHER
2002-10-11 6:42 ` Florian Hars
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