[LLVMdev] Measure execution time of each basic block

[Jonathan Roelofs]

I think if you do this, you're quickly going to realize that there's quite a lot 
of overhead in getting the time stamps needed to record basic block duration, so 
you're not going to get accurate results except for really big basic blocks.


Cheers,

Jon

On 9/17/14 1:53 PM, Vanderson Martins do Rosario wrote:
> Guys,
>
> Someone have any idea how could I measure the execution time of each LLVM basic
> block of a program?
>
> I tried to use some profiling tools like gcov and perf, but as far as I know
> they can only give me the frequency that each basic block is executed.
>
> I was thinking about writing a pass to add PAPI instructions in each LLVM basic
> block. Do you think is a good idea?
>
> Thanks
>
> Vanderson M. Rosario
>
>
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-- 
Jon Roelofs
jonathan at codesourcery.com
CodeSourcery / Mentor Embedded