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  3. September 2001

Re: Tagged memory (was Re: Memory Upgrade)

Alexei,

>Are you saying that if you replace TXER instruction by NOOP and then go on
>to use untagged pointer, there will be no exception ?

You may find Leif's book interesting.  Of particular relevance to this thread
are chapters 6 & 7, where he demonstrates the difference between the RISC and
CISC systems in this regard.  But the short version is that while the CISC
hardware *prevents* twiddling the tag bits, the RISC hardware *detects* it but
it is software which attempts to enforce it.  And that software can be defeated,
as Leif demonstrates...

Doug

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