the current code page's mode. It was &'ing against fetchModeMask:
((pageWriteStamp & fetchModeMask) == fetchModeMask)
instead of against a constant mask which populates all the
relevant bits:
((pageWriteStamp & ICacheFetchModeMask) == fetchModeMask)
* Moved the check above to ::prefetch(), since nothing should change
between calls to that function. I added some code to functions
which load CS to make sure that is the case.
* Commented out several calls to invalidate_prefetch_q() in
ctrl_xfer{16,32,64}.cc. Changes to only EIP (i.e. CS is not
modified) don't matter any more. If EIP lands outside the
window of the current code page, ::prefetch() is called.
* These changes add a few percent of performance.
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