Add an MRI::tracksLiveness() flag.

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

diff --git a/lib/CodeGen/Spiller.cpp b/lib/CodeGen/Spiller.cpp
index 908380488446a2936f6b041370841d5a33e70164..b72dea732f7f22719b5859f9446858a4e530baba 100644 (file)
--- a/lib/CodeGen/Spiller.cpp
+++ b/lib/CodeGen/Spiller.cpp
@@ -72,8 +72,9 @@ protected:
   /// Add spill ranges for every use/def of the live interval, inserting loads
   /// immediately before each use, and stores after each def. No folding or
   /// remat is attempted.
-  void trivialSpillEverywhere(LiveInterval *li,
-                              SmallVectorImpl<LiveInterval*> &newIntervals) {
+  void trivialSpillEverywhere(LiveRangeEdit& LRE) {
+    LiveInterval* li = &LRE.getParent();
+
     DEBUG(dbgs() << "Spilling everywhere " << *li << "\n");
 
     assert(li->weight != HUGE_VALF &&
@@ -115,17 +116,14 @@ protected:
       }
 
       // Create a new vreg & interval for this instr.
-      unsigned newVReg = mri->createVirtualRegister(trc);
-      vrm->grow();
-      vrm->assignVirt2StackSlot(newVReg, ss);
-      LiveInterval *newLI = &lis->getOrCreateInterval(newVReg);
+      LiveInterval *newLI = &LRE.create(*lis, *vrm);
       newLI->weight = HUGE_VALF;
 
       // Update the reg operands & kill flags.
       for (unsigned i = 0; i < indices.size(); ++i) {
         unsigned mopIdx = indices[i];
         MachineOperand &mop = mi->getOperand(mopIdx);
-        mop.setReg(newVReg);
+        mop.setReg(newLI->reg);
         if (mop.isUse() && !mi->isRegTiedToDefOperand(mopIdx)) {
           mop.setIsKill(true);
         }
@@ -135,31 +133,29 @@ protected:
       // Insert reload if necessary.
       MachineBasicBlock::iterator miItr(mi);
       if (hasUse) {
-        tii->loadRegFromStackSlot(*mi->getParent(), miItr, newVReg, ss, trc,
+        tii->loadRegFromStackSlot(*mi->getParent(), miItr, newLI->reg, ss, trc,
                                   tri);
         MachineInstr *loadInstr(prior(miItr));
         SlotIndex loadIndex =
           lis->InsertMachineInstrInMaps(loadInstr).getRegSlot();
         SlotIndex endIndex = loadIndex.getNextIndex();
         VNInfo *loadVNI =
-          newLI->getNextValue(loadIndex, 0, lis->getVNInfoAllocator());
+          newLI->getNextValue(loadIndex, lis->getVNInfoAllocator());
         newLI->addRange(LiveRange(loadIndex, endIndex, loadVNI));
       }
 
       // Insert store if necessary.
       if (hasDef) {
-        tii->storeRegToStackSlot(*mi->getParent(), llvm::next(miItr), newVReg,
+        tii->storeRegToStackSlot(*mi->getParent(), llvm::next(miItr),newLI->reg,
                                  true, ss, trc, tri);
         MachineInstr *storeInstr(llvm::next(miItr));
         SlotIndex storeIndex =
           lis->InsertMachineInstrInMaps(storeInstr).getRegSlot();
         SlotIndex beginIndex = storeIndex.getPrevIndex();
         VNInfo *storeVNI =
-          newLI->getNextValue(beginIndex, 0, lis->getVNInfoAllocator());
+          newLI->getNextValue(beginIndex, lis->getVNInfoAllocator());
         newLI->addRange(LiveRange(beginIndex, storeIndex, storeVNI));
       }
-
-      newIntervals.push_back(newLI);
     }
   }
 };
@@ -179,18 +175,20 @@ public:
 
   void spill(LiveRangeEdit &LRE) {
     // Ignore spillIs - we don't use it.
-    trivialSpillEverywhere(&LRE.getParent(), *LRE.getNewVRegs());
+    trivialSpillEverywhere(LRE);
   }
 };
 
 } // end anonymous namespace
 
+void Spiller::anchor() { }
+
 llvm::Spiller* llvm::createSpiller(MachineFunctionPass &pass,
                                    MachineFunction &mf,
                                    VirtRegMap &vrm) {
   switch (spillerOpt) {
-  default: assert(0 && "unknown spiller");
   case trivial: return new TrivialSpiller(pass, mf, vrm);
   case inline_: return createInlineSpiller(pass, mf, vrm);
   }
+  llvm_unreachable("Invalid spiller optimization");
 }