[llvm] r358058 - [ScheduleDAG] Add statistics for maintaining the topological order.

[Florian Hahn via llvm-commits]

Author: fhahn
Date: Wed Apr 10 02:03:03 2019
New Revision: 358058

URL: http://llvm.org/viewvc/llvm-project?rev=358058&view=rev
Log:
[ScheduleDAG] Add statistics for maintaining the topological order.

This is helpful to measure the impact of D60125 on maintaining
topological orders.

Reviewers: MatzeB, atrick, efriedma, niravd

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D60187

Modified:
    llvm/trunk/lib/CodeGen/ScheduleDAG.cpp

Modified: llvm/trunk/lib/CodeGen/ScheduleDAG.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/ScheduleDAG.cpp?rev=358058&r1=358057&r2=358058&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/ScheduleDAG.cpp (original)
+++ llvm/trunk/lib/CodeGen/ScheduleDAG.cpp Wed Apr 10 02:03:03 2019
@@ -14,6 +14,7 @@
 #include "llvm/CodeGen/ScheduleDAG.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/iterator_range.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/ScheduleHazardRecognizer.h"
@@ -37,6 +38,10 @@ using namespace llvm;
 
 #define DEBUG_TYPE "pre-RA-sched"
 
+STATISTIC(NumNewPredsAdded, "Number of times a  single predecessor was added");
+STATISTIC(NumTopoInits,
+          "Number of times the topological order has been recomputed");
+
 #ifndef NDEBUG
 static cl::opt<bool> StressSchedOpt(
   "stress-sched", cl::Hidden, cl::init(false),
@@ -497,6 +502,7 @@ void ScheduleDAGTopologicalSort::InitDAG
   }
 
   Visited.resize(DAGSize);
+  NumTopoInits++;
 
 #ifndef NDEBUG
   // Check correctness of the ordering
@@ -523,6 +529,8 @@ void ScheduleDAGTopologicalSort::AddPred
     // Recompute topological indexes.
     Shift(Visited, LowerBound, UpperBound);
   }
+
+  NumNewPredsAdded++;
 }
 
 void ScheduleDAGTopologicalSort::RemovePred(SUnit *M, SUnit *N) {