[ScheduleDAG] Move `Topo` and `addEdge` to base class.

Some DAG mutations can only be applied to `ScheduleDAGMI`, and have to
internally cast a `ScheduleDAGInstrs` to `ScheduleDAGMI`.

There is nothing actually specific to `ScheduleDAGMI` in `Topo`.

llvm-svn: 357239

1 files changed, 5 insertions, 7 deletions

diff --git a/llvm/lib/CodeGen/MacroFusion.cpp b/llvm/lib/CodeGen/MacroFusion.cpp
index c7b8bf9fff6..2db1e86905a 100644
--- a/llvm/lib/CodeGen/MacroFusion.cpp
+++ b/llvm/lib/CodeGen/MacroFusion.cpp
@@ -36,7 +36,7 @@ static bool isHazard(const SDep &Dep) {
   return Dep.getKind() == SDep::Anti || Dep.getKind() == SDep::Output;
 }
 
-static bool fuseInstructionPair(ScheduleDAGMI &DAG, SUnit &FirstSU,
+static bool fuseInstructionPair(ScheduleDAGInstrs &DAG, SUnit &FirstSU,
                                 SUnit &SecondSU) {
   // Check that neither instr is already paired with another along the edge
   // between them.
@@ -48,7 +48,7 @@ static bool fuseInstructionPair(ScheduleDAGMI &DAG, SUnit &FirstSU,
     if (SI.isCluster())
       return false;
   // Though the reachability checks above could be made more generic,
-  // perhaps as part of ScheduleDAGMI::addEdge(), since such edges are valid,
+  // perhaps as part of ScheduleDAGInstrs::addEdge(), since such edges are valid,
   // the extra computation cost makes it less interesting in general cases.
 
   // Create a single weak edge between the adjacent instrs. The only effect is
@@ -117,7 +117,7 @@ namespace {
 class MacroFusion : public ScheduleDAGMutation {
   ShouldSchedulePredTy shouldScheduleAdjacent;
   bool FuseBlock;
-  bool scheduleAdjacentImpl(ScheduleDAGMI &DAG, SUnit &AnchorSU);
+  bool scheduleAdjacentImpl(ScheduleDAGInstrs &DAG, SUnit &AnchorSU);
 
 public:
   MacroFusion(ShouldSchedulePredTy shouldScheduleAdjacent, bool FuseBlock)
@@ -128,9 +128,7 @@ public:
 
 } // end anonymous namespace
 
-void MacroFusion::apply(ScheduleDAGInstrs *DAGInstrs) {
-  ScheduleDAGMI *DAG = static_cast<ScheduleDAGMI*>(DAGInstrs);
-
+void MacroFusion::apply(ScheduleDAGInstrs *DAG) {
   if (FuseBlock)
     // For each of the SUnits in the scheduling block, try to fuse the instr in
     // it with one in its predecessors.
@@ -144,7 +142,7 @@ void MacroFusion::apply(ScheduleDAGInstrs *DAGInstrs) {
 
 /// Implement the fusion of instr pairs in the scheduling DAG,
 /// anchored at the instr in AnchorSU..
-bool MacroFusion::scheduleAdjacentImpl(ScheduleDAGMI &DAG, SUnit &AnchorSU) {
+bool MacroFusion::scheduleAdjacentImpl(ScheduleDAGInstrs &DAG, SUnit &AnchorSU) {
   const MachineInstr &AnchorMI = *AnchorSU.getInstr();
   const TargetInstrInfo &TII = *DAG.TII;
   const TargetSubtargetInfo &ST = DAG.MF.getSubtarget();