Summary:
Example output for vzeroall:
---
mode: uops
key:
instructions:
- 'VZEROALL'
config: ''
register_initial_values:
cpu_name: haswell
llvm_triple: x86_64-unknown-linux-gnu
num_repetitions: 10000
measurements:
- { debug_string: HWPort0, value: 0.0006, per_snippet_value: 0.0006,
key: '3' }
- { debug_string: HWPort1, value: 0.0011, per_snippet_value: 0.0011,
key: '4' }
- { debug_string: HWPort2, value: 0.0004, per_snippet_value: 0.0004,
key: '5' }
- { debug_string: HWPort3, value: 0.0018, per_snippet_value: 0.0018,
key: '6' }
- { debug_string: HWPort4, value: 0.0002, per_snippet_value: 0.0002,
key: '7' }
- { debug_string: HWPort5, value: 1.0019, per_snippet_value: 1.0019,
key: '8' }
- { debug_string: HWPort6, value: 1.0033, per_snippet_value: 1.0033,
key: '9' }
- { debug_string: HWPort7, value: 0.0001, per_snippet_value: 0.0001,
key: '10' }
- { debug_string: NumMicroOps, value: 20.0069, per_snippet_value: 20.0069,
key: NumMicroOps }
error: ''
info: ''
assembled_snippet: C5FC77C5FC77C5FC77C5FC77C5FC77C5FC77C5FC77C5FC77C5FC77C5FC77C5FC77C5FC77C5FC77C5FC77C5FC77C5FC77C3
...
Reviewers: gchatelet
Subscribers: tschuett, RKSimon, andreadb, llvm-commits
Differential Revision: https://reviews.llvm.org/D52539
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@343094
91177308-0d34-0410-b5e6-
96231b3b80d8
// cycles.
const char *CycleCounter;
+ // An optional name of a performance counter that can be used to measure
+ // uops.
+ const char *UopsCounter;
+
// For each MCProcResourceDesc defined by the processor, an optional list of
// names of performance counters that can be used to measure the resource
// utilization.
// The list of counters that measure issue events.
list<string> Counters = counters;
}
+
+// Each processor can define how to measure NumMicroOps by defining a
+// PfmUopsCounter.
+class PfmUopsCounter<string counter> : PfmCounter {
+ string Counter = counter;
+}
+
def HWPort5Counter : PfmIssueCounter<HWPort5, ["uops_dispatched_port:port_5"]>;
def HWPort6Counter : PfmIssueCounter<HWPort6, ["uops_dispatched_port:port_6"]>;
def HWPort7Counter : PfmIssueCounter<HWPort7, ["uops_dispatched_port:port_7"]>;
+def HWUopsCounter : PfmUopsCounter<"uops_issued:any">;
}
let SchedModel = BroadwellModel in {
};
struct BenchmarkMeasure {
+ // A helper to create an unscaled BenchmarkMeasure.
+ static BenchmarkMeasure Create(std::string Key, double Value) {
+ return {Key, Value, Value, Key};
+ }
std::string Key;
// This is the per-instruction value, i.e. measured quantity scaled per
// instruction.
// This is the per-snippet value, i.e. measured quantity for one repetition of
// the whole snippet.
double PerSnippetValue;
+ // FIXME: remove, use `Key` instead.
std::string DebugString;
};
if (Value < MinLatency)
MinLatency = Value;
}
- return {{"latency", static_cast<double>(MinLatency),
- static_cast<double>(MinLatency), ""}};
+ return {BenchmarkMeasure::Create("latency", MinLatency)};
}
} // namespace exegesis
ScratchSpace &Scratch) const {
const auto &SchedModel = State.getSubtargetInfo().getSchedModel();
- std::vector<BenchmarkMeasure> Result;
- for (unsigned ProcResIdx = 1;
- ProcResIdx < SchedModel.getNumProcResourceKinds(); ++ProcResIdx) {
- const char *const PfmCounters = SchedModel.getExtraProcessorInfo()
- .PfmCounters.IssueCounters[ProcResIdx];
- if (!PfmCounters)
- continue;
+ const auto RunMeasurement = [&Function,
+ &Scratch](const char *const Counters) {
// We sum counts when there are several counters for a single ProcRes
// (e.g. P23 on SandyBridge).
int64_t CounterValue = 0;
llvm::SmallVector<llvm::StringRef, 2> CounterNames;
- llvm::StringRef(PfmCounters).split(CounterNames, ',');
+ llvm::StringRef(Counters).split(CounterNames, ',');
for (const auto &CounterName : CounterNames) {
pfm::PerfEvent UopPerfEvent(CounterName);
if (!UopPerfEvent.valid())
llvm::report_fatal_error(
- llvm::Twine("invalid perf event ").concat(PfmCounters));
+ llvm::Twine("invalid perf event ").concat(Counters));
pfm::Counter Counter(UopPerfEvent);
Scratch.clear();
Counter.start();
Counter.stop();
CounterValue += Counter.read();
}
- Result.push_back({llvm::itostr(ProcResIdx),
- static_cast<double>(CounterValue),
- static_cast<double>(CounterValue),
- SchedModel.getProcResource(ProcResIdx)->Name});
+ return CounterValue;
+ };
+
+ std::vector<BenchmarkMeasure> Result;
+ const auto& PfmCounters = SchedModel.getExtraProcessorInfo().PfmCounters;
+ // Uops per port.
+ for (unsigned ProcResIdx = 1;
+ ProcResIdx < SchedModel.getNumProcResourceKinds(); ++ProcResIdx) {
+ const char *const Counters = PfmCounters.IssueCounters[ProcResIdx];
+ if (!Counters)
+ continue;
+ const double CounterValue = RunMeasurement(Counters);
+ Result.push_back(BenchmarkMeasure::Create(SchedModel.getProcResource(ProcResIdx)->Name, CounterValue));
+ }
+ // NumMicroOps.
+ if (const char *const UopsCounter = PfmCounters.UopsCounter) {
+ const double CounterValue = RunMeasurement(UopsCounter);
+ Result.push_back(BenchmarkMeasure::Create("NumMicroOps", CounterValue));
}
return Result;
}
}
PM.PfmCycleCounterDef = Def;
}
+ for (Record *Def : Records.getAllDerivedDefinitions("PfmUopsCounter")) {
+ CodeGenProcModel &PM = getProcModel(Def->getValueAsDef("SchedModel"));
+ if (PM.PfmUopsCounterDef) {
+ PrintFatalError(Def->getLoc(),
+ "multiple uops counters for " +
+ Def->getValueAsDef("SchedModel")->getName());
+ }
+ PM.PfmUopsCounterDef = Def;
+ }
}
// Collect and sort WriteRes, ReadAdvance, and ProcResources.
// List of PfmCounters.
RecVec PfmIssueCounterDefs;
Record *PfmCycleCounterDef = nullptr;
+ Record *PfmUopsCounterDef = nullptr;
CodeGenProcModel(unsigned Idx, std::string Name, Record *MDef,
Record *IDef) :
bool hasExtraProcessorInfo() const {
return RetireControlUnit || !RegisterFiles.empty() ||
!PfmIssueCounterDefs.empty() ||
- PfmCycleCounterDef != nullptr;
+ PfmCycleCounterDef != nullptr ||
+ PfmUopsCounterDef != nullptr;
}
unsigned getProcResourceIdx(Record *PRDef) const;
else
OS << " nullptr, // No cycle counter.\n";
+ // Emit the uops counter.
+ if (ProcModel.PfmUopsCounterDef)
+ OS << " \"" << ProcModel.PfmUopsCounterDef->getValueAsString("Counter")
+ << "\", // Uops counter.\n";
+ else
+ OS << " nullptr, // No uops counter.\n";
+
// Emit a reference to issue counters table.
if (HasPfmIssueCounters)
OS << " " << ProcModel.ModelName << "PfmIssueCounters\n";