misched: add a hook for custom DAG postprocessing.

llvm-svn: 163915

1 files changed, 9 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/MachineScheduler.cpp b/llvm/lib/CodeGen/MachineScheduler.cpp
index 330ec560f88..d7ecec4163a 100644
--- a/llvm/lib/CodeGen/MachineScheduler.cpp
+++ b/llvm/lib/CodeGen/MachineScheduler.cpp
@@ -484,6 +484,8 @@ void ScheduleDAGMI::releaseRoots() {
 void ScheduleDAGMI::schedule() {
   buildDAGWithRegPressure();
 
+  postprocessDAG();
+
   DEBUG(for (unsigned su = 0, e = SUnits.size(); su != e; ++su)
           SUnits[su].dumpAll(this));
 
@@ -522,6 +524,13 @@ void ScheduleDAGMI::buildDAGWithRegPressure() {
   initRegPressure();
 }
 
+/// Apply each ScheduleDAGMutation step in order.
+void ScheduleDAGMI::postprocessDAG() {
+  for (unsigned i = 0, e = Mutations.size(); i < e; ++i) {
+    Mutations[i]->apply(this);
+  }
+}
+
 /// Identify DAG roots and setup scheduler queues.
 void ScheduleDAGMI::initQueues() {
   // Initialize the strategy before modifying the DAG.