From: Richard Biener <richard.guenther@gmail.com>
To: Toon Moene <toon@moene.org>
Cc: gcc mailing list <gcc@gcc.gnu.org>
Subject: Re: Complex numbers in compilers - upcoming GNU Tools Cauldron.
Date: Tue, 12 Sep 2023 11:25:50 +0200 [thread overview]
Message-ID: <CAFiYyc2XiZF_96MayieTQF5BmrUeuuKdnczA5Cp_WOnkb57H7A@mail.gmail.com> (raw)
In-Reply-To: <f3922268-7b27-4eff-ad16-f9bd77736c7d@moene.org>
On Tue, Sep 5, 2023 at 10:44 PM Toon Moene <toon@moene.org> wrote:
>
> This is going to be an interesting discussion.
>
> In the upcoming GNU Tools Cauldron meeting the representation of complex
> numbers in GCC will be discussed from the following "starting point":
>
> "Complex numbers are used to describe many physical phenomenons and are
> of prime importance in data signal processing. Nevertheless, despite
> being part of the C and C++ standards since C99, they are still not
> completely first class citizens in mainstream compilers."
>
> *This* is from the Fortran 66 Standard (http://moene.org/~toon/f66.pdf -
> a photocopy of the 1966 Standard):
>
> - - - - -
>
> Chapter 4. Data Types:
> ...
> 4.2.4 Complex Type.
>
> A complex datum is processor approximation to the value of a complex number.
> ...
>
> - - - - -
>
> I can recall people complaining about the way complex arithmetic was
> handled by compilers since the late 70s.
>
> This is even obvious in weather forecasting software I have to deal with
> *today* (all written in Fortran). Some models use complex variables to
> encode the "spectral" (wave-decomposed) computations in parts where that
> is useful - others just "degrade" those algorithms to explicitly use reals.
Lack of applications / benchmarks using complex numbers is also a
problem for any work on this.
Richard.
> Kind regards,
>
> --
> Toon Moene - e-mail: toon@moene.org - phone: +31 346 214290
> Saturnushof 14, 3738 XG Maartensdijk, The Netherlands
next prev parent reply other threads:[~2023-09-12 9:27 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-05 20:43 Toon Moene
2023-09-12 9:25 ` Richard Biener [this message]
2023-09-12 11:12 ` Martin Uecker
2023-09-12 13:31 ` Paul Koning
2023-09-12 18:36 ` Toon Moene
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