SPARC: Optimized floating-point context handling

[Sebastian Huber]

Hello,

we intend to change the floating-point context handling a bit on SPARC:

https://devel.rtems.org/ticket/2270

There are basically three implementation options. I am happy to get some 
comments.

-- 
Sebastian Huber, embedded brains GmbH

Address : Dornierstr. 4, D-82178 Puchheim, Germany
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