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re: Stack bias

   OK, how does bias of 2047 allow to address more stack space, vs. 32-bit
   mode with no bias? What's the stack limit in 64 and 32-bit modes?

it isn't that there is a stack size limit.  that's an OS concept.

the issue is that, with a 13 bit signed offset, you get to load or
store either side of the stack pointer, which gives you more space
to access without having to modify %sp.


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