How much NEON state should be saved in a context switch? (xilinx zynq)

[Sebastian Huber]

Hello Stephen,

the rule of thumb is to save/restore the volatile registers in the 
context switch and to save/restore the non-volatile registers in the 
exception epilogue/prologue. See also _ARMV4_Exception_interrupt.

As an optimization it would be possible to add some sort of lazy context 
save/restore during exception processing.

-- 
Sebastian Huber, embedded brains GmbH

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