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