[llvm-mca] Move the logic that prints scheduler statistics from BackendStatistics to its own view.
Added flag -scheduler-stats to print scheduler related statistics.
llvm-svn: 329792
diff --git a/llvm/tools/llvm-mca/SchedulerStatistics.cpp b/llvm/tools/llvm-mca/SchedulerStatistics.cpp
new file mode 100644
index 0000000..28a34de
--- /dev/null
+++ b/llvm/tools/llvm-mca/SchedulerStatistics.cpp
@@ -0,0 +1,92 @@
+//===--------------------- SchedulerStatistics.cpp --------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+/// \file
+///
+/// This file implements the SchedulerStatistics interface.
+///
+//===----------------------------------------------------------------------===//
+
+#include "SchedulerStatistics.h"
+#include "llvm/Support/Format.h"
+
+using namespace llvm;
+
+namespace mca {
+
+void SchedulerStatistics::onInstructionEvent(const HWInstructionEvent &Event) {
+ if (Event.Type == HWInstructionEvent::Issued)
+ ++NumIssued;
+}
+
+void SchedulerStatistics::onReservedBuffers(ArrayRef<unsigned> Buffers) {
+ for (const unsigned Buffer : Buffers) {
+ if (BufferedResources.find(Buffer) != BufferedResources.end()) {
+ BufferUsage &BU = BufferedResources[Buffer];
+ BU.SlotsInUse++;
+ BU.MaxUsedSlots = std::max(BU.MaxUsedSlots, BU.SlotsInUse);
+ continue;
+ }
+
+ BufferedResources.insert(
+ std::pair<unsigned, BufferUsage>(Buffer, {1U, 1U}));
+ }
+}
+
+void SchedulerStatistics::onReleasedBuffers(ArrayRef<unsigned> Buffers) {
+ for (const unsigned Buffer : Buffers) {
+ assert(BufferedResources.find(Buffer) != BufferedResources.end() &&
+ "Buffered resource not in map?");
+ BufferUsage &BU = BufferedResources[Buffer];
+ BU.SlotsInUse--;
+ }
+}
+
+void SchedulerStatistics::printSchedulerStatistics(llvm::raw_ostream &OS) const {
+ std::string Buffer;
+ raw_string_ostream TempStream(Buffer);
+ TempStream << "\n\nSchedulers - number of cycles where we saw N instructions "
+ "issued:\n";
+ TempStream << "[# issued], [# cycles]\n";
+ for (const std::pair<unsigned, unsigned> &Entry : IssuedPerCycle) {
+ TempStream << " " << Entry.first << ", " << Entry.second << " ("
+ << format("%.1f", ((double)Entry.second / NumCycles) * 100)
+ << "%)\n";
+ }
+
+ TempStream.flush();
+ OS << Buffer;
+}
+
+void SchedulerStatistics::printSchedulerUsage(raw_ostream &OS,
+ const MCSchedModel &SM) const {
+ std::string Buffer;
+ raw_string_ostream TempStream(Buffer);
+ TempStream << "\n\nScheduler's queue usage:\n";
+ // Early exit if no buffered resources were consumed.
+ if (BufferedResources.empty()) {
+ TempStream << "No scheduler resources used.\n";
+ TempStream.flush();
+ OS << Buffer;
+ return;
+ }
+
+ for (unsigned I = 0, E = SM.getNumProcResourceKinds(); I < E; ++I) {
+ const MCProcResourceDesc &ProcResource = *SM.getProcResource(I);
+ if (ProcResource.BufferSize <= 0)
+ continue;
+
+ const BufferUsage &BU = BufferedResources.lookup(I);
+ TempStream << ProcResource.Name << ", " << BU.MaxUsedSlots << '/'
+ << ProcResource.BufferSize << '\n';
+ }
+
+ TempStream.flush();
+ OS << Buffer;
+}
+} // namespace mca