llvm dev - Nov 2012 - [LLVMdev] LLVM Value relationship with metadata

Thanks for your reply David. Would you please clarify what do you mean by
saying:

David Chisnall-5 wrote
> Increasingly, it seems that nodes have several metadata nodes and so they
> are all paying the time penalty for the lookup. 
Arsen



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On 6 Nov 2012, at 04:54, Arsen wrote:
> Thanks for your reply David. Would you please clarify what do you mean by
> saying:
> 
> David Chisnall-5 wrote
>> Increasingly, it seems that nodes have several metadata nodes and so
they
>> are all paying the time penalty for the lookup. 
I mean that metadata has gone from being something that occasionally appeared,
and then mainly in debug mode, to something that appears on a large number of
instructions.  The current design was created when metadata was both rarely
created and rarely queried.  It is now far more frequently created, although it
may still be relatively infrequently queried (mainly TBAA, debug info writing). 
It is therefore probably worth profiling whether the original design decisions
are still correct.

David

Thanks for clarifications

Arsen



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