[llvm-mca] Renamed BackendStatistics to RetireControlUnitStatistics.

Also, removed flag -verbose in favor of flag -retire-stats.

llvm-svn: 329794

1 files changed, 61 insertions, 0 deletions

diff --git a/llvm/tools/llvm-mca/RetireControlUnitStatistics.h b/llvm/tools/llvm-mca/RetireControlUnitStatistics.h
new file mode 100644
index 00000000000..f3952abe11d
--- /dev/null
+++ b/llvm/tools/llvm-mca/RetireControlUnitStatistics.h
@@ -0,0 +1,61 @@
+//===--------------------- RetireControlUnitStatistics.h ------------------*-
+//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 defines class RetireControlUnitStatistics: a view that knows how
+/// to print general statistics related to the retire control unit.
+///
+/// Example:
+/// ========
+///
+/// Retire Control Unit - number of cycles where we saw N instructions retired:
+/// [# retired], [# cycles]
+///  0,           9  (6.9%)
+///  1,           6  (4.6%)
+///  2,           1  (0.8%)
+///  4,           3  (2.3%)
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TOOLS_LLVM_MCA_RETIRECONTROLUNITSTATISTICS_H
+#define LLVM_TOOLS_LLVM_MCA_RETIRECONTROLUNITSTATISTICS_H
+
+#include "View.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+
+namespace mca {
+
+class RetireControlUnitStatistics : public View {
+  using Histogram = llvm::DenseMap<unsigned, unsigned>;
+  Histogram RetiredPerCycle;
+
+  unsigned NumRetired;
+  unsigned NumCycles;
+
+  void updateHistograms() {
+    RetiredPerCycle[NumRetired]++;
+    NumRetired = 0;
+  }
+
+public:
+  RetireControlUnitStatistics() : NumRetired(0), NumCycles(0) {}
+
+  void onInstructionEvent(const HWInstructionEvent &Event) override;
+
+  void onCycleBegin(unsigned Cycle) override { NumCycles++; }
+
+  void onCycleEnd(unsigned Cycle) override { updateHistograms(); }
+
+  void printView(llvm::raw_ostream &OS) const override;
+};
+} // namespace mca
+
+#endif