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MachineScheduler: Add -misched-print-dags flag

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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.

llvm-svn: 342589
This commit is contained in:
Matthias Braun 2018-09-19 20:50:49 +00:00
parent 4a1fa0164e
commit 97fbf1c620
1 changed files with 6 additions and 1 deletions
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7
lib/CodeGen/MachineScheduler.cpp
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@ -100,8 +100,11 @@ static cl::opt<std::string> SchedOnlyFunc("misched-only-func", cl::Hidden,
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.