[llvm-dev] Get basic-block cycle cost from LLVM

Rick Veens via llvm-dev llvm-dev at lists.llvm.org
Thu Nov 9 04:41:39 PST 2017

Hi all,

I'm interested in obtaining the cycles spend by the CPU from LLVM and i was
wondering if this was possible to obtain this with the scheduling
information from LLVM. (For the cortex-m0 in particular).

I found the following function : getInstrLatency() in the TargetInstrInfo

If i sum the latencies of the instructions in a basic block i suppose i
will get the total cycle cost for  the cortex-m0.

>From what i understand is that there are multiple ways of doing scheduling
in LLVM.
I have read about one way which is using Itenaries and another which is
using SchedMachineModel.

Will the above function always give me the latencies, independent on the
scheduling method used ?

Sorry if this is a stupid question, i'm a beginner to LLVM.

Best regards,

Rick Veens
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