Fix a typo in a comment

[oota-llvm.git] / lib / CodeGen / StackSlotColoring.cpp

diff --git a/lib/CodeGen/StackSlotColoring.cpp b/lib/CodeGen/StackSlotColoring.cpp
index e1b63680e021b2f75127c552e06ff3272cc0c49a..9f44df8f4308f1a38a96f194891756dab1d71f3e 100644 (file)
--- a/lib/CodeGen/StackSlotColoring.cpp
+++ b/lib/CodeGen/StackSlotColoring.cpp
@@ -106,7 +106,7 @@ namespace {
     bool OverlapWithAssignments(LiveInterval *li, int Color) const;
     int ColorSlot(LiveInterval *li);
     bool ColorSlots(MachineFunction &MF);
-    void RewriteInstruction(MachineInstr *MI, SmallVector<int, 16> &SlotMapping,
+    void RewriteInstruction(MachineInstr *MI, SmallVectorImpl<int> &SlotMapping,
                             MachineFunction &MF);
     bool RemoveDeadStores(MachineBasicBlock* MBB);
   };
@@ -340,7 +340,7 @@ bool StackSlotColoring::ColorSlots(MachineFunction &MF) {
 /// RewriteInstruction - Rewrite specified instruction by replacing references
 /// to old frame index with new one.
 void StackSlotColoring::RewriteInstruction(MachineInstr *MI,
-                                           SmallVector<int, 16> &SlotMapping,
+                                           SmallVectorImpl<int> &SlotMapping,
                                            MachineFunction &MF) {
   // Update the operands.
   for (unsigned i = 0, ee = MI->getNumOperands(); i != ee; ++i) {
@@ -377,10 +377,19 @@ bool StackSlotColoring::RemoveDeadStores(MachineBasicBlock* MBB) {
     if (DCELimit != -1 && (int)NumDead >= DCELimit)
       break;
 
+    int FirstSS, SecondSS;
+    if (TII->isStackSlotCopy(I, FirstSS, SecondSS) &&
+        FirstSS == SecondSS &&
+        FirstSS != -1) {
+      ++NumDead;
+      changed = true;
+      toErase.push_back(I);
+      continue;
+    }
+        
     MachineBasicBlock::iterator NextMI = llvm::next(I);
     if (NextMI == MBB->end()) continue;
 
-    int FirstSS, SecondSS;
     unsigned LoadReg = 0;
     unsigned StoreReg = 0;
     if (!(LoadReg = TII->isLoadFromStackSlot(I, FirstSS))) continue;