[Numpy-discussion] Solaris Sparc build broken

Charles R Harris charlesr.harris@gmail....
Fri Nov 6 09:05:39 CST 2009


On Fri, Nov 6, 2009 at 12:10 AM, David Cournapeau <
david@ar.media.kyoto-u.ac.jp> wrote:

> Charles R Harris wrote:
> >
> >
> > On Thu, Nov 5, 2009 at 10:35 PM, David Cournapeau
> > <david@ar.media.kyoto-u.ac.jp <mailto:david@ar.media.kyoto-u.ac.jp>>
> > wrote:
> >
> >     Charles R Harris wrote:
> >     > So you are going to leave us all hanging here in curiosity? What is
> >     > your solution?
> >
> >     I had to sleep :)
> >
> >     The solution is based on parsing the generated binary code -
> >     that's how
> >     MPFR is doing it, so it has been tested in the wild. The code to
> >     compile
> >     is something like:
> >
> >     /* "before" is 16 bytes to ensure there's no padding between it
> >     and "x".
> >      *    We're not expecting any "long double" bigger than 16 bytes
> >     or with
> >      *       alignment requirements stricter than 16 bytes.  */
> >     typedef long double test_type;
> >
> >     struct {
> >            char         before[16];
> >            test_type    x;
> >            char         after[8];
> >     } foo = {
> >            { '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
> >              '\001', '\043', '\105', '\147', '\211', '\253', '\315',
> >     '\357' },
> >            -123456789.0,
> >            { '\376', '\334', '\272', '\230', '\166', '\124', '\062',
> >     '\020' }
> >     };
> >
> >     They compile it, parse with awk from the dump od -f.
> >
> >
> > So the before/after bits are tags that mark the beginning/end of the
> > type for the parse? Any particular reason not to use a string?
> As for why not using my name, I am not that megalomaniac, at least not
> yet :)
>
> od prints a dump in octal form, so a string is not much more readable. I
> am not sure why they use od instead of another dump format - but there
> is value if keeping the same format as them for testing, all other
> things being equal.
>
>
Is od available on all platforms? Couldn't you just read the file using
Python?

Chuck
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