1 files changed, 13 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/PostRASchedulerList.cpp b/llvm/lib/CodeGen/PostRASchedulerList.cpp
index 06a88bfb4c6..4266dec82d7 100644
--- a/llvm/lib/CodeGen/PostRASchedulerList.cpp
+++ b/llvm/lib/CodeGen/PostRASchedulerList.cpp
@@ -128,6 +128,9 @@ namespace {
     /// The schedule. Null SUnit*'s represent noop instructions.
     std::vector<SUnit*> Sequence;
 
+    /// Ordered list of DAG postprocessing steps.
+    std::vector<std::unique_ptr<ScheduleDAGMutation>> Mutations;
+
     /// The index in BB of RegionEnd.
     ///
     /// This is the instruction number from the top of the current block, not
@@ -176,6 +179,9 @@ namespace {
     void finishBlock() override;
 
   private:
+    /// Apply each ScheduleDAGMutation step in order.
+    void postprocessDAG();
+
     void ReleaseSucc(SUnit *SU, SDep *SuccEdge);
     void ReleaseSuccessors(SUnit *SU);
     void ScheduleNodeTopDown(SUnit *SU, unsigned CurCycle);
@@ -203,6 +209,7 @@ SchedulePostRATDList::SchedulePostRATDList(
   HazardRec =
       MF.getSubtarget().getInstrInfo()->CreateTargetPostRAHazardRecognizer(
           InstrItins, this);
+  MF.getSubtarget().getPostRAMutations(Mutations);
 
   assert((AntiDepMode == TargetSubtargetInfo::ANTIDEP_NONE ||
           MRI.tracksLiveness()) &&
@@ -429,6 +436,12 @@ void SchedulePostRATDList::finishBlock() {
   ScheduleDAGInstrs::finishBlock();
 }
 
+/// Apply each ScheduleDAGMutation step in order.
+void SchedulePostRATDList::postprocessDAG() {
+  for (auto &M : Mutations)
+    M->apply(this);
+}
+
 //===----------------------------------------------------------------------===//
 //  Top-Down Scheduling
 //===----------------------------------------------------------------------===//