From: "Richard W.M. Jones" <rich@annexia.org>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Zarith problems on ppc64le
Date: Mon, 7 Nov 2016 15:48:43 +0000 [thread overview]
Message-ID: <20161107154843.GH27249@annexia.org> (raw)
In-Reply-To: <20161107132201.GG27249@annexia.org>
On Mon, Nov 07, 2016 at 01:22:01PM +0000, Richard W.M. Jones wrote:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1392247
>
> Zarith fails tests on OCaml 4.04.0 + ppc64le with some fairly gross
> errors, eg:
>
> of_float -1.
> - = -1
> + = 0
>
> (It passes fine on OCaml 4.04.0 + ppc64)
>
> The implementation of Zarith is quite complex and I've so far failed
> to understand what's going on.
FWIW this seems like it is invoking undefined behaviour in C. See
my analysis here:
https://bugzilla.redhat.com/show_bug.cgi?id=1392247#c3
Rich.
next prev parent reply other threads:[~2016-11-07 15:48 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-07 13:22 Richard W.M. Jones
2016-11-07 13:31 ` Nicolas Ojeda Bar
2016-11-07 13:55 ` Francois BERENGER
2016-11-07 14:11 ` Sylvain Le Gall
2016-11-07 14:59 ` Simon Cruanes
2016-11-15 9:11 ` Bernhard Schommer
2016-11-07 15:48 ` Richard W.M. Jones [this message]
2016-11-07 15:58 ` Xavier Leroy
2016-11-07 16:19 ` Richard W.M. Jones
2016-11-08 10:00 ` Goswin von Brederlow
2016-11-08 11:10 ` Richard W.M. Jones
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