(original) (raw)

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 class.

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