[Numpy-discussion] What is the sign of nan?

Charles R Harris charlesr.harris@gmail....
Mon Sep 29 23:18:13 CDT 2008


On Mon, Sep 29, 2008 at 9:53 PM, David Cournapeau <
david@ar.media.kyoto-u.ac.jp> wrote:

> Charles R Harris wrote:
> >
> > Do any of the MS compilers handle these things correctly?
>
> Don't know. To be 100 % honest, one of the problem for MS compilers is
> the /Ox flag (for IEEE-754 rules). This should not be used for numpy,
> period (I am sure you could break numpy with gcc and -ffast-math and co;
> the difference being gcc by default is compliant by default and
> documented properly). Also, MS compiler (even the recent ones) say they
> are not C99 compliant, because there is no customer need for it:
>
> http://blogs.msdn.com/vcblog/archive/2007/11/05/iso-c-standard-update.aspx
>

That's why they don't support long doubles either. I wonder how they plan on
moving into the HPC area with that attitude?

Chuck
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