stack size limit on ppc/ppc64

[Anil K Prasad]

>There are a few things to change for ppc64:
>- add the 64bit versions of the store with update instructions
>- keep in mind the 64bit ABI allows space below the sp to be used (it
>  looks like the 2048 constant will cover this)

>Does anyone feel in the mood to work on this?

I can work your code fragment and fine tune it..

Thanks,
Anil.

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