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

bugzilla-daemon at rtems.org bugzilla-daemon at rtems.org
Mon Feb 28 08:23:23 UTC 2011


--- Comment #22 from Sebastian Huber <sebastian.huber at embedded-brains.de> 2011-02-28 02:23:22 CST ---
(In reply to comment #20)
> (In reply to comment #16)
> > From my point of view -mspe and -mabi=spe is mandatory, if you want to use any
> > SPE instructions.
> The later half of your sentence is the key question to me.
> Why would you want to use "any spe instruction" and what would doing so buy to
> you?

The SPE and embedded floating point unit is a key feature of this processor. 
Doing floating point calculations with this unit is considerable faster than
software floating point calculations.  Competing operation systems like Linux,
QNX, and VxWorks provide support for it.

One application we want to support uses the embedded floating point unit for
pattern recognition and has to cope with 500MByte/s of video data (we use more
than one e500v2 core of course).

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