[openbeos] Re: trigonometric functions
- From: "Axel Dörfler" <axeld@xxxxxxxxxxxxxxxx>
- To: openbeos@xxxxxxxxxxxxx
- Date: Thu, 19 May 2005 01:17:12 +0200 CEST
"Andrew Bachmann" <andrewbachmann@xxxxxxxxxxxxx> wrote:
> "Axel Dörfler" <axeld@xxxxxxxxxxxxxxxx> wrote:
> > "Andrew Bachmann" <andrewbachmann@xxxxxxxxxxxxx> wrote:
> > > I have added some math tests to: src/tests/kernel/libroot/posix/
> > > math
> > > They currently just print a table of the values from our cos/sin
> > > functions and the values from libbe. The results are the same as
> > > Stephan reported. (these functions don't work properly)
> > Great!
> > BTW why do you need to define "national" for the libroot.so build
> > but
> > not for you test application?
> I had to define it for both.
It's not defined in the Jamfile for the test! That's why I ask.
> > > Two side notes:
> > > 1. the tests should probably be moved from "kernel" to "system",
> > > like the src subdirectory was a little while back.
> > Definitely, I just didn't find the time to do it yet.
> I thought "this is easy now that we have svn" then I realized that
> all
> the Jamfiles have to change too.
Yes :-)
I've written a small script for this, but some paths might need manual
adjustment anyway.
> > > 2. the math test uses get_image_symbol to retrieve the libbe
> > > function pointers for cos/sin, which is a technique that could
> > > be useful for other tests as well.
> > Not too useful most of the time, as these tests are usually thought
> > to
> > run under both platforms. Ie. also, and especially, natively under
> > Haiku, for example.
> > It's better to test against known behaviour (like sin^2 + cos^2 ==
> > 1 in
> > your test).
> Although the way the test is currently written it should also run
> under haiku, a large portion of it will be moot since libroot.so in
> haiku will be the same code as the test. :-)
Exactly :-)
Bye,
Axel.
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