--------------------------<snip>-------------------------
Is there much of a cost to switching amodes?

Is it worth writing code to be able to run completely in 64 bit mode (and maintain the top half of the registers) or is it fine to switch in and out when referencing storage above the bar?

POPs does not indicate anything.
------------------------<unsnip>-------------------------
My own "gut feel" is that this should be no more expensive than switching above and below the 16M line. YMMV.

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