[llvm] r342589 - MachineScheduler: Add -misched-print-dags flag

[Matthias Braun via llvm-commits]

Author: matze
Date: Wed Sep 19 13:50:49 2018
New Revision: 342589

URL: http://llvm.org/viewvc/llvm-project?rev=342589&view=rev
Log:
MachineScheduler: Add -misched-print-dags flag

Add a flag to dump the schedule DAG to the debug stream. This will be
used in upcoming commits to test schedule DAG mutations such as macro
fusion.

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

Modified: llvm/trunk/lib/CodeGen/MachineScheduler.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/MachineScheduler.cpp?rev=342589&r1=342588&r2=342589&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/MachineScheduler.cpp (original)
+++ llvm/trunk/lib/CodeGen/MachineScheduler.cpp Wed Sep 19 13:50:49 2018
@@ -100,8 +100,11 @@ static cl::opt<std::string> SchedOnlyFun
   cl::desc("Only schedule this function"));
 static cl::opt<unsigned> SchedOnlyBlock("misched-only-block", cl::Hidden,
                                         cl::desc("Only schedule this MBB#"));
+static cl::opt<bool> PrintDAGs("misched-print-dags", cl::Hidden,
+                              cl::desc("Print schedule DAGs"));
 #else
-static bool ViewMISchedDAGs = false;
+static const bool ViewMISchedDAGs = false;
+static const bool PrintDAGs = false;
 #endif // NDEBUG
 
 /// Avoid quadratic complexity in unusually large basic blocks by limiting the
@@ -765,6 +768,7 @@ void ScheduleDAGMI::schedule() {
   findRootsAndBiasEdges(TopRoots, BotRoots);
 
   LLVM_DEBUG(dump());
+  if (PrintDAGs) dump();
   if (ViewMISchedDAGs) viewGraph();
 
   // Initialize the strategy before modifying the DAG.
@@ -1218,6 +1222,7 @@ void ScheduleDAGMILive::schedule() {
   SchedImpl->initialize(this);
 
   LLVM_DEBUG(dump());
+  if (PrintDAGs) dump();
   if (ViewMISchedDAGs) viewGraph();
 
   // Initialize ready queues now that the DAG and priority data are finalized.