[Bug 1740] Change PowerPC multi-libs for e200 and e500 cores

bugzilla-daemon at rtems.org bugzilla-daemon at rtems.org
Fri Feb 25 09:11:16 UTC 2011


--- Comment #17 from dufault at hda.com 2011-02-25 03:11:15 CST ---
(In reply to comment #14)

> Newlib needs IEEE 754 conformance - It doesn't support anything else.

Please expand.  Please explain what will happen when the non-spec shortcuts are
in effect, and why it will not be useful.

Is it because carefully-written maths (the complex arc-cosine result shown
earlier in the wrong quadrant) may be bogus?  If so, I think the heads-up that
it isn't fully compliant without the software wrapper is adequate.

In the case of many real-time applications the injection of process noise is
going to make the default behavior acceptable.  One will need to be careful
with something like an ideal system model, and then injection of synthetic
noise might be enough.  This is IMHO, I'd appreciate other opinions.

As Sebastian presented earlier, the behavior is outlined in Freescale's "Signal
Engine (SPE) Programming Environments Manual:", I have SPEPIM.pdf Rev.
0 01/2008

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