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 //===- TargetPfmCounters.td - Target Pfm Counters -*- tablegen ----------*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines the target-independent interfaces for performance counters.
 //
 //===----------------------------------------------------------------------===//
 
 // Definition of a hardware counters from libpfm identifiers.
 class PfmCounter<string counter> {
   // The name of the counter that measures events.
   // The name can be "some_counter + some_other_counter", in which case the
   // measured value is the sum of events on these counters.
   string Counter = counter;
 }
 
 // Issue counters can be tied to a ProcResource
 class PfmIssueCounter<string resource_name, string counter>
     : PfmCounter<counter> {
   // The name of the ProcResource on which uops are issued. This is used by
   // llvm-exegesis to compare measurements with values in the SchedModels.
   // If the CPU has a sched model, this should correspond to the name of a
   // ProcResource.
   string ResourceName = resource_name;
 }
 
 // Definition of a validation event. A validation event represents a specific
 // event that can be measured using performance counters that is interesting
 // in regard to the snippet state.
 class ValidationEvent <int event_number> {
   int EventNumber = event_number;
 }
 
 // TableGen names for events defined in `llvm::exegesis::ValidationEvent`.
 def InstructionRetired  : ValidationEvent<0>;
 def L1DCacheLoadMiss : ValidationEvent<1>;
 def L1DCacheStoreMiss : ValidationEvent<2>;
 def L1ICacheLoadMiss : ValidationEvent<3>;
 def DataTLBLoadMiss : ValidationEvent<4>;
 def DataTLBStoreMiss : ValidationEvent<5>;
 def InstructionTLBLoadMiss : ValidationEvent<6>;
 def BranchPredictionMiss : ValidationEvent<7>;
 
 
 // PfmValidationCounter provides a mapping between the events that are
 // are interesting in regards to the snippet execution environment and
 // a concrete performance counter name that can be looked up in libpfm.
 class PfmValidationCounter<ValidationEvent event_type, string counter>
     : PfmCounter<counter> {
   // The name of the event that the validation counter detects.
   ValidationEvent EventType = event_type;
 }
 
 def NoPfmCounter : PfmCounter <""> {}
 
 // Set of PfmCounters for measuring sched model characteristics.
 class ProcPfmCounters {
   // Processors can define how to measure cycles by defining a CycleCounter.
   PfmCounter CycleCounter = NoPfmCounter;
   // Processors can define how to measure uops by defining a UopsCounter.
   PfmCounter UopsCounter = NoPfmCounter;
   // Processors can define how to measure issued uops by defining IssueCounters.
   list<PfmIssueCounter> IssueCounters = [];
   // Processor can list mappings between validation events and real counters
   // to measure the specified events.
   list<PfmValidationCounter> ValidationCounters = [];
 }
 
 // A binding of a set of counters to a CPU.
 class PfmCountersBinding<string cpu_name, ProcPfmCounters counters> {
   string CpuName = cpu_name;
   ProcPfmCounters Counters = counters;
 }
 
 // Declares the default binding for unbound CPUs for the target.
 class PfmCountersDefaultBinding<ProcPfmCounters counters>
     : PfmCountersBinding<"", counters> {}

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