Disentangle moving a machine instr from updating LiveIntervals.

llvm-svn: 150552

llvm/include/llvm/CodeGen/LiveIntervalAnalysis.h

@@ -280,10 +280,11 @@ namespace llvm {
     /// register.
     void addKillFlags();
 
-    /// moveInstr - Move MachineInstr mi to insertPt, updating the live
-    /// intervals of mi's operands to reflect the new position. The insertion
-    /// point can be above or below mi, but must be in the same basic block.
-    void moveInstr(MachineBasicBlock::iterator insertPt, MachineInstr* mi);
+    /// handleMove - call this method to notify LiveIntervals that
+    /// instruction 'mi' has been moved within a basic block. This will update
+    /// the live intervals for all operands of mi. Moves between basic blocks
+    /// are not supported.
+    void handleMove(MachineInstr* mi);
 
     // Register mask functions.
     //

llvm/lib/CodeGen/LiveIntervalAnalysis.cpp

@@ -963,22 +963,17 @@ static void handleMoveUses(const MachineBasicBlock *mbb,
   }
 }
 
-void LiveIntervals::moveInstr(MachineBasicBlock::iterator insertPt,
-                              MachineInstr *mi) {
-  MachineBasicBlock* mbb = mi->getParent();
-  assert((insertPt == mbb->end() || insertPt->getParent() == mbb) &&
-         "Cannot handle moves across basic block boundaries.");
-  assert(&*insertPt != mi && "No-op move requested?");
-  assert(!mi->isBundled() && "Can't handle bundled instructions yet.");
-
-  // Grab the original instruction index.
+void LiveIntervals::handleMove(MachineInstr *mi) {
   SlotIndex origIdx = indexes_->getInstructionIndex(mi);
-
-  // Move the machine instr and obtain its new index.
   indexes_->removeMachineInstrFromMaps(mi);
-  mbb->splice(insertPt, mbb, mi);
   SlotIndex miIdx = indexes_->insertMachineInstrInMaps(mi);
 
+  MachineBasicBlock* mbb = mi->getParent();
+  
+  assert(getMBBFromIndex(origIdx) == mbb &&
+         "Cannot handle moves across basic block boundaries.");
+  assert(!mi->isBundled() && "Can't handle bundled instructions yet.");
+
   // Pick the direction.
   bool movingUp = miIdx < origIdx;
 

llvm/lib/CodeGen/MachineScheduler.cpp

@@ -229,7 +229,8 @@ void ScheduleTopDownLive::Schedule() {
     if (&*InsertPos == MI)
       ++InsertPos;
     else {
-      Pass->LIS->moveInstr(InsertPos, MI);
+      BB->splice(InsertPos, BB, MI);
+      Pass->LIS->handleMove(MI);
       if (Begin == InsertPos)
         Begin = MI;
     }