[LLVMdev] About LLVM

David Greene dag at cray.com
Tue Jan 5 12:30:43 PST 2010

On Tuesday 05 January 2010 12:07, ambika wrote:

> I am a new user to LLVM and trying to figure out if this is what I
> really want to complete my thesis work.

Yes.  :)

> I want to add a pointer analysis phase to compiler optimization. This
> analysis will take profile information into account.

Ok.  LLVM has profiling.  What kind of profile information do you need?

> My analysis requires to analyse a single statement at a time and then I
> also want to perform some code duplication to finally perform the
> optimization.

Define "statement."  Do you mean source-level statement?  the LLVM IR works in 
terms of instructions.  Groups of instructions can be specified in a DAG of 
sorts or they can be fissioned into individual instructions that each write to 
a temporary virtual register.

There is no high-level notion of a statement or control structure.  If you 
need that you'll have to build it.  No other open source C/C++ compiler 
infrastructure provides that either, AFAIK.

> Finally I would like to compare the results with and without my pass on
> benchmark standards.

This is trivial with LLVM.

> I was just wondering if I can do all this with LLVM. I have very short
> period for my thesis and I have to implement and get the results. So I
> will be highly obliged if anyone of you can help me out.

What's "very short?"  Doing anything substantial with aliasing/pointer
analysis is not "very short" by definition.


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