llvm dev - Feb 2016 - How to write LLVM pass to collect register usage stats

Hi All,

I wanted to collect the register usage stats for the program assigned by
compiler(in other words "how many time each register will be accessed by
the program when it will execute"). How to write LLVM pass which will
analyse the code after LLVM global register allocation pass and output the
stats.

Regards,
-Bala


-- 
Thanks,
Bala
IIITA Allahabad
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On 2/26/16 1:47 AM, Balasaheb Dabhade via llvm-dev
wrote:
> Hi All,
>
> I wanted to collect the register usage stats for the program assigned 
> by compiler(in other words "how many time each register will be 
> accessed by the program when it will execute"). How to write LLVM pass
> which will analyse the code after LLVM global register allocation pass 
> and output the stats.
Are you counting the number of static uses of a register in each 
function, or are you instrumenting the program to count the number of 
times a register is used during execution?

Regardless of which you are doing, you will need to write a 
MachineFunctionPass that performs the analysis and/or instrumentation.  
You can read about the MachineFunctionPass in the "How to Write an LLVM 
Pass" document.  This document (http://llvm.org/docs/CodeGenerator.html) 
will also be useful.

Regards,

John Criswell
>
> Regards,
> -Bala
>
> -- 
> Thanks,
> Bala
> IIITA Allahabad
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
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-- 
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
http://www.cs.rochester.edu/u/criswell

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