[llvm-dev] Get basic-block cycle cost from LLVM (original) (raw)
陳韋任 via llvm-dev llvm-dev at lists.llvm.org
Fri Nov 10 06:22:28 PST 2017
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I believe so, though I am not expert in this field. :)
2017-11-09 20:41 GMT+08:00 Rick Veens via llvm-dev <llvm-dev at lists.llvm.org> :
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
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