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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;
}
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 = [];
}
// 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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