1 //===- TargetPfmCounters.td - Target Pfm Counters -*- tablegen ----------*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file defines the target-independent interfaces for performance counters.
11 // Definition of a hardware counters from libpfm identifiers.
12 class PfmCounter<string counter> {
13 // The name of the counter that measures events.
14 // The name can be "some_counter + some_other_counter", in which case the
15 // measured value is the sum of events on these counters.
16 string Counter = counter;
19 // Issue counters can be tied to a ProcResource
20 class PfmIssueCounter<string resource_name, string counter>
21 : PfmCounter<counter> {
22 // The name of the ProcResource on which uops are issued. This is used by
23 // llvm-exegesis to compare measurements with values in the SchedModels.
24 // If the CPU has a sched model, this should correspond to the name of a
26 string ResourceName = resource_name;
29 def NoPfmCounter : PfmCounter <""> {}
31 // Set of PfmCounters for measuring sched model characteristics.
32 class ProcPfmCounters {
33 // Processors can define how to measure cycles by defining a CycleCounter.
34 PfmCounter CycleCounter = NoPfmCounter;
35 // Processors can define how to measure uops by defining a UopsCounter.
36 PfmCounter UopsCounter = NoPfmCounter;
37 // Processors can define how to measure issued uops by defining IssueCounters.
38 list<PfmIssueCounter> IssueCounters = [];
41 // A binding of a set of counters to a CPU.
42 class PfmCountersBinding<string cpu_name, ProcPfmCounters counters> {
43 string CpuName = cpu_name;
44 ProcPfmCounters Counters = counters;
47 // Declares the default binding for unbound CPUs for the target.
48 class PfmCountersDefaultBinding<ProcPfmCounters counters>
49 : PfmCountersBinding<"", counters> {}