I am looking at the tight inner loop of a scientific simulation. I wanted to see if mispredicted branches were causing slowdowns in my code. I was planning to use valgrinds branch prediction tool, but then I noticed this text:
Cachegrind simulates branch predictors intended to be typical of mainstream desktop/server processors of around 2004.
It then continues…
More recent processors have better branch predictors, in particular better indirect branch predictors. Cachegrind’s predictor design is deliberately conservative so as to be representative of the large installed base of processors which pre-date widespread deployment of more sophisticated indirect branch predictors. In particular, late model Pentium 4s (Prescott), Pentium M, Core and Core 2 have more sophisticated indirect branch predictors than modelled by Cachegrind.
This sounds hopelessly out of date. Is there any utility in valgrind to evaluate branch performance today?
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