1//===- TargetPfmCounters.td - Target Pfm Counters -*- tablegen ----------*-===//
2//
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
6//
7//===----------------------------------------------------------------------===//
8//
9// This file defines the target-independent interfaces for performance counters.
10//
11//===----------------------------------------------------------------------===//
12
13// Definition of a hardware counters from libpfm identifiers.
14class PfmCounter<string counter> {
15  // The name of the counter that measures events.
16  // The name can be "some_counter + some_other_counter", in which case the
17  // measured value is the sum of events on these counters.
18  string Counter = counter;
19}
20
21// Issue counters can be tied to a ProcResource
22class PfmIssueCounter<string resource_name, string counter>
23    : PfmCounter<counter> {
24  // The name of the ProcResource on which uops are issued. This is used by
25  // llvm-exegesis to compare measurements with values in the SchedModels.
26  // If the CPU has a sched model, this should correspond to the name of a
27  // ProcResource.
28  string ResourceName = resource_name;
29}
30
31def NoPfmCounter : PfmCounter <""> {}
32
33// Set of PfmCounters for measuring sched model characteristics.
34class ProcPfmCounters {
35  // Processors can define how to measure cycles by defining a CycleCounter.
36  PfmCounter CycleCounter = NoPfmCounter;
37  // Processors can define how to measure uops by defining a UopsCounter.
38  PfmCounter UopsCounter = NoPfmCounter;
39  // Processors can define how to measure issued uops by defining IssueCounters.
40  list<PfmIssueCounter> IssueCounters = [];
41}
42
43// A binding of a set of counters to a CPU.
44class PfmCountersBinding<string cpu_name, ProcPfmCounters counters> {
45  string CpuName = cpu_name;
46  ProcPfmCounters Counters = counters;
47}
48
49// Declares the default binding for unbound CPUs for the target.
50class PfmCountersDefaultBinding<ProcPfmCounters counters>
51    : PfmCountersBinding<"", counters> {}
52