Someone can fill in the details, but instruction groups are 128 bits,
divided into 4 sections - 3 instructions and a tagging section that
describes the types of the 3 instructions.
The 128 bit instruction groups must be aligned.
I can only assume that WCHAN would contain the instruction group address.
-Rob
On Sat, 14 Aug 1999, Albert D. Cahalan wrote:
> Date: Sat, 14 Aug 1999 23:17:49 -0400 (EDT)
> From: Albert D. Cahalan <acahalan@cs.uml.edu>
> To: linux-kernel@vger.rutgers.edu
> Subject: ia64 code addresses
>
>
> I'm in need of a hash function for WCHAN data. On the Alpha, I ought to
> get good results by shifting right by 3 bits and then masking to fit
> the table size. Intel has oddly made instructions 128/3 bits long, so
> I don't really know what to expect.
>
> Are code addresses in terms of bytes?
> Can an instruction act alone or only as part of a group?
>
> In other words, can I expect the low 4 bits of WCHAN to be zero?
>
>
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