[llvm-exegesis] Add an analysis mode.

The analysis mode gives the user a clustered view of the measurement results and
highlights any inconsistencies with the checked-in data.

llvm-svn: 332229

1 files changed, 55 insertions, 0 deletions

diff --git a/llvm/tools/llvm-exegesis/lib/Analysis.cpp b/llvm/tools/llvm-exegesis/lib/Analysis.cpp
new file mode 100644
index 00000000000..48700218577
--- /dev/null
+++ b/llvm/tools/llvm-exegesis/lib/Analysis.cpp
@@ -0,0 +1,55 @@
+
+#include "Analysis.h"
+#include "llvm/Support/Format.h"
+
+namespace exegesis {
+
+namespace {
+
+// Prints a row representing an instruction, along with scheduling info and
+// point coordinates (measurements).
+void renderInstructionRow(const InstructionBenchmark &Point,
+                          const size_t NameLen, llvm::raw_ostream &OS) {
+  OS << llvm::format("%*s", NameLen, Point.AsmTmpl.Name.c_str());
+  for (const auto &Measurement : Point.Measurements) {
+    OS << llvm::format("   %*.2f", Measurement.Key.size(), Measurement.Value);
+  }
+  OS << "\n";
+}
+
+void analyzeCluster(const std::vector<InstructionBenchmark> &Points,
+                    const llvm::MCSubtargetInfo &STI,
+                    const InstructionBenchmarkClustering::Cluster &Cluster,
+                    llvm::raw_ostream &OS) {
+  // TODO:
+  // std::sort(Cluster.PointIndices.begin(), Cluster.PointIndices.end(),
+  // [](int PointIdA, int PointIdB) { return GetSchedClass(Points[PointIdA]) <
+  // GetSchedClass(Points[PointIdB]); });
+  OS << "Cluster:\n";
+  // Get max length of the name for alignement.
+  size_t NameLen = 0;
+  for (const auto &PointId : Cluster.PointIndices) {
+    NameLen = std::max(NameLen, Points[PointId].AsmTmpl.Name.size());
+  }
+
+  // Print all points.
+  for (const auto &PointId : Cluster.PointIndices) {
+    renderInstructionRow(Points[PointId], NameLen, OS);
+  }
+}
+
+} // namespace
+
+llvm::Error
+printAnalysisClusters(const InstructionBenchmarkClustering &Clustering,
+                      const llvm::MCSubtargetInfo &STI, llvm::raw_ostream &OS) {
+
+  for (const auto &Cluster : Clustering.getValidClusters()) {
+    analyzeCluster(Clustering.getPoints(), STI, Cluster, OS);
+    OS << "\n\n\n";
+  }
+
+  return llvm::Error::success();
+}
+
+} // namespace exegesis