[llvm-dev] How to write LLVM pass to collect register usage stats
John Criswell via llvm-dev
llvm-dev at lists.llvm.org
Fri Feb 26 05:46:08 PST 2016
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.
> IIITA Allahabad
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
Department of Computer Science, University of Rochester
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