Sorry, forgot to post to list.
For 2.7 I'm wondering if you could use custom metadata attached to the first
instruction of a "special" block? You could register a unique kind
(not sure how to guarantee uniqueness), and attach a metadata node via the
context to the first instruction with this kind. Your pass would look for this.
I have never tried this, so I don't know if predecessor passes that your
pass would depend on would affect this metadata; if different threads with their
own context would see metadata attached via a specific context; and what the
resultant performance effect would be.
Just a thought
Garrison
On Jan 2, 2010, at 10:52, Yannis Mantzouratos wrote:
> Hi,
>
> We 're working on an llvm interpreter. We perform some static analysis
> to detect some blocks with a specific property, and we need the
> interpreter to be able to recognise these blocks fast in time it
> reaches them. We thought of adding a new instruction in the LLVM
> instruction set and put it in the beginning of such blocks, so that
> the interpreter would be instantly alerted that the current block is
> 'special'. Is there an easier/quicker way to do this?
>
> Cheers,
> yannis
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