Track new virtual registers by register number.

Track new virtual registers by register number, rather than by the live
interval created for them. This is the first step in separating the
creation of new virtual registers and new live intervals.  Eventually
live intervals will be created and populated on demand after the virtual
registers have been created and used in instructions.

llvm-svn: 188434

1 files changed, 29 insertions, 29 deletions

diff --git a/llvm/lib/CodeGen/RegAllocGreedy.cpp b/llvm/lib/CodeGen/RegAllocGreedy.cpp
index f9e363b9f3a..d7a3d26bf7b 100644
--- a/llvm/lib/CodeGen/RegAllocGreedy.cpp
+++ b/llvm/lib/CodeGen/RegAllocGreedy.cpp
@@ -147,7 +147,7 @@ class RAGreedy : public MachineFunctionPass,
   void setStage(Iterator Begin, Iterator End, LiveRangeStage NewStage) {
     ExtraRegInfo.resize(MRI->getNumVirtRegs());
     for (;Begin != End; ++Begin) {
-      unsigned Reg = (*Begin)->reg;
+      unsigned Reg = *Begin;
       if (ExtraRegInfo[Reg].Stage == RS_New)
         ExtraRegInfo[Reg].Stage = NewStage;
     }
@@ -241,7 +241,7 @@ public:
   virtual void enqueue(LiveInterval *LI);
   virtual LiveInterval *dequeue();
   virtual unsigned selectOrSplit(LiveInterval&,
-                                 SmallVectorImpl<LiveInterval*>&);
+                                 SmallVectorImpl<unsigned>&);
 
   /// Perform register allocation.
   virtual bool runOnMachineFunction(MachineFunction &mf);
@@ -265,22 +265,22 @@ private:
   bool shouldEvict(LiveInterval &A, bool, LiveInterval &B, bool);
   bool canEvictInterference(LiveInterval&, unsigned, bool, EvictionCost&);
   void evictInterference(LiveInterval&, unsigned,
-                         SmallVectorImpl<LiveInterval*>&);
+                         SmallVectorImpl<unsigned>&);
 
   unsigned tryAssign(LiveInterval&, AllocationOrder&,
-                     SmallVectorImpl<LiveInterval*>&);
+                     SmallVectorImpl<unsigned>&);
   unsigned tryEvict(LiveInterval&, AllocationOrder&,
-                    SmallVectorImpl<LiveInterval*>&, unsigned = ~0u);
+                    SmallVectorImpl<unsigned>&, unsigned = ~0u);
   unsigned tryRegionSplit(LiveInterval&, AllocationOrder&,
-                          SmallVectorImpl<LiveInterval*>&);
+                          SmallVectorImpl<unsigned>&);
   unsigned tryBlockSplit(LiveInterval&, AllocationOrder&,
-                         SmallVectorImpl<LiveInterval*>&);
+                         SmallVectorImpl<unsigned>&);
   unsigned tryInstructionSplit(LiveInterval&, AllocationOrder&,
-                               SmallVectorImpl<LiveInterval*>&);
+                               SmallVectorImpl<unsigned>&);
   unsigned tryLocalSplit(LiveInterval&, AllocationOrder&,
-    SmallVectorImpl<LiveInterval*>&);
+    SmallVectorImpl<unsigned>&);
   unsigned trySplit(LiveInterval&, AllocationOrder&,
-                    SmallVectorImpl<LiveInterval*>&);
+                    SmallVectorImpl<unsigned>&);
 };
 } // end anonymous namespace
 
@@ -455,7 +455,7 @@ LiveInterval *RAGreedy::dequeue() {
 /// tryAssign - Try to assign VirtReg to an available register.
 unsigned RAGreedy::tryAssign(LiveInterval &VirtReg,
                              AllocationOrder &Order,
-                             SmallVectorImpl<LiveInterval*> &NewVRegs) {
+                             SmallVectorImpl<unsigned> &NewVRegs) {
   Order.rewind();
   unsigned PhysReg;
   while ((PhysReg = Order.next()))
@@ -638,7 +638,7 @@ bool RAGreedy::canEvictInterference(LiveInterval &VirtReg, unsigned PhysReg,
 /// from being assigned to Physreg. This assumes that canEvictInterference
 /// returned true.
 void RAGreedy::evictInterference(LiveInterval &VirtReg, unsigned PhysReg,
-                                 SmallVectorImpl<LiveInterval*> &NewVRegs) {
+                                 SmallVectorImpl<unsigned> &NewVRegs) {
   // Make sure that VirtReg has a cascade number, and assign that cascade
   // number to every evicted register. These live ranges than then only be
   // evicted by a newer cascade, preventing infinite loops.
@@ -670,7 +670,7 @@ void RAGreedy::evictInterference(LiveInterval &VirtReg, unsigned PhysReg,
            "Cannot decrease cascade number, illegal eviction");
     ExtraRegInfo[Intf->reg].Cascade = Cascade;
     ++NumEvicted;
-    NewVRegs.push_back(Intf);
+    NewVRegs.push_back(Intf->reg);
   }
 }
 
@@ -680,7 +680,7 @@ void RAGreedy::evictInterference(LiveInterval &VirtReg, unsigned PhysReg,
 /// @return         Physreg to assign VirtReg, or 0.
 unsigned RAGreedy::tryEvict(LiveInterval &VirtReg,
                             AllocationOrder &Order,
-                            SmallVectorImpl<LiveInterval*> &NewVRegs,
+                            SmallVectorImpl<unsigned> &NewVRegs,
                             unsigned CostPerUseLimit) {
   NamedRegionTimer T("Evict", TimerGroupName, TimePassesIsEnabled);
 
@@ -1125,7 +1125,7 @@ void RAGreedy::splitAroundRegion(LiveRangeEdit &LREdit,
 
   SmallVector<unsigned, 8> IntvMap;
   SE->finish(&IntvMap);
-  DebugVars->splitRegister(Reg, LREdit.regs());
+  DebugVars->splitRegister(Reg, LREdit.regs(), *LIS);
 
   ExtraRegInfo.resize(MRI->getNumVirtRegs());
   unsigned OrigBlocks = SA->getNumLiveBlocks();
@@ -1136,7 +1136,7 @@ void RAGreedy::splitAroundRegion(LiveRangeEdit &LREdit,
   // - Block-local splits are candidates for local splitting.
   // - DCE leftovers should go back on the queue.
   for (unsigned i = 0, e = LREdit.size(); i != e; ++i) {
-    LiveInterval &Reg = *LREdit.get(i);
+    LiveInterval &Reg = LIS->getInterval(LREdit.get(i));
 
     // Ignore old intervals from DCE.
     if (getStage(Reg) != RS_New)
@@ -1170,7 +1170,7 @@ void RAGreedy::splitAroundRegion(LiveRangeEdit &LREdit,
 }
 
 unsigned RAGreedy::tryRegionSplit(LiveInterval &VirtReg, AllocationOrder &Order,
-                                  SmallVectorImpl<LiveInterval*> &NewVRegs) {
+                                  SmallVectorImpl<unsigned> &NewVRegs) {
   unsigned NumCands = 0;
   unsigned BestCand = NoCand;
   BlockFrequency BestCost;
@@ -1305,7 +1305,7 @@ unsigned RAGreedy::tryRegionSplit(LiveInterval &VirtReg, AllocationOrder &Order,
 /// creates a lot of local live ranges, that will be split by tryLocalSplit if
 /// they don't allocate.
 unsigned RAGreedy::tryBlockSplit(LiveInterval &VirtReg, AllocationOrder &Order,
-                                 SmallVectorImpl<LiveInterval*> &NewVRegs) {
+                                 SmallVectorImpl<unsigned> &NewVRegs) {
   assert(&SA->getParent() == &VirtReg && "Live range wasn't analyzed");
   unsigned Reg = VirtReg.reg;
   bool SingleInstrs = RegClassInfo.isProperSubClass(MRI->getRegClass(Reg));
@@ -1326,14 +1326,14 @@ unsigned RAGreedy::tryBlockSplit(LiveInterval &VirtReg, AllocationOrder &Order,
   SE->finish(&IntvMap);
 
   // Tell LiveDebugVariables about the new ranges.
-  DebugVars->splitRegister(Reg, LREdit.regs());
+  DebugVars->splitRegister(Reg, LREdit.regs(), *LIS);
 
   ExtraRegInfo.resize(MRI->getNumVirtRegs());
 
   // Sort out the new intervals created by splitting. The remainder interval
   // goes straight to spilling, the new local ranges get to stay RS_New.
   for (unsigned i = 0, e = LREdit.size(); i != e; ++i) {
-    LiveInterval &LI = *LREdit.get(i);
+    LiveInterval &LI = LIS->getInterval(LREdit.get(i));
     if (getStage(LI) == RS_New && IntvMap[i] == 0)
       setStage(LI, RS_Spill);
   }
@@ -1357,7 +1357,7 @@ unsigned RAGreedy::tryBlockSplit(LiveInterval &VirtReg, AllocationOrder &Order,
 /// This is similar to spilling to a larger register class.
 unsigned
 RAGreedy::tryInstructionSplit(LiveInterval &VirtReg, AllocationOrder &Order,
-                              SmallVectorImpl<LiveInterval*> &NewVRegs) {
+                              SmallVectorImpl<unsigned> &NewVRegs) {
   // There is no point to this if there are no larger sub-classes.
   if (!RegClassInfo.isProperSubClass(MRI->getRegClass(VirtReg.reg)))
     return 0;
@@ -1393,7 +1393,7 @@ RAGreedy::tryInstructionSplit(LiveInterval &VirtReg, AllocationOrder &Order,
 
   SmallVector<unsigned, 8> IntvMap;
   SE->finish(&IntvMap);
-  DebugVars->splitRegister(VirtReg.reg, LREdit.regs());
+  DebugVars->splitRegister(VirtReg.reg, LREdit.regs(), *LIS);
   ExtraRegInfo.resize(MRI->getNumVirtRegs());
 
   // Assign all new registers to RS_Spill. This was the last chance.
@@ -1491,7 +1491,7 @@ void RAGreedy::calcGapWeights(unsigned PhysReg,
 /// basic block.
 ///
 unsigned RAGreedy::tryLocalSplit(LiveInterval &VirtReg, AllocationOrder &Order,
-                                 SmallVectorImpl<LiveInterval*> &NewVRegs) {
+                                 SmallVectorImpl<unsigned> &NewVRegs) {
   assert(SA->getUseBlocks().size() == 1 && "Not a local interval");
   const SplitAnalysis::BlockInfo &BI = SA->getUseBlocks().front();
 
@@ -1685,7 +1685,7 @@ unsigned RAGreedy::tryLocalSplit(LiveInterval &VirtReg, AllocationOrder &Order,
   SE->useIntv(SegStart, SegStop);
   SmallVector<unsigned, 8> IntvMap;
   SE->finish(&IntvMap);
-  DebugVars->splitRegister(VirtReg.reg, LREdit.regs());
+  DebugVars->splitRegister(VirtReg.reg, LREdit.regs(), *LIS);
 
   // If the new range has the same number of instructions as before, mark it as
   // RS_Split2 so the next split will be forced to make progress. Otherwise,
@@ -1698,8 +1698,8 @@ unsigned RAGreedy::tryLocalSplit(LiveInterval &VirtReg, AllocationOrder &Order,
     assert(!ProgressRequired && "Didn't make progress when it was required.");
     for (unsigned i = 0, e = IntvMap.size(); i != e; ++i)
       if (IntvMap[i] == 1) {
-        setStage(*LREdit.get(i), RS_Split2);
-        DEBUG(dbgs() << PrintReg(LREdit.get(i)->reg));
+        setStage(LIS->getInterval(LREdit.get(i)), RS_Split2);
+        DEBUG(dbgs() << PrintReg(LREdit.get(i)));
       }
     DEBUG(dbgs() << '\n');
   }
@@ -1716,7 +1716,7 @@ unsigned RAGreedy::tryLocalSplit(LiveInterval &VirtReg, AllocationOrder &Order,
 /// assignable.
 /// @return Physreg when VirtReg may be assigned and/or new NewVRegs.
 unsigned RAGreedy::trySplit(LiveInterval &VirtReg, AllocationOrder &Order,
-                            SmallVectorImpl<LiveInterval*>&NewVRegs) {
+                            SmallVectorImpl<unsigned>&NewVRegs) {
   // Ranges must be Split2 or less.
   if (getStage(VirtReg) >= RS_Spill)
     return 0;
@@ -1765,7 +1765,7 @@ unsigned RAGreedy::trySplit(LiveInterval &VirtReg, AllocationOrder &Order,
 //===----------------------------------------------------------------------===//
 
 unsigned RAGreedy::selectOrSplit(LiveInterval &VirtReg,
-                                 SmallVectorImpl<LiveInterval*> &NewVRegs) {
+                                 SmallVectorImpl<unsigned> &NewVRegs) {
   // First try assigning a free register.
   AllocationOrder Order(VirtReg.reg, *VRM, RegClassInfo);
   if (unsigned PhysReg = tryAssign(VirtReg, Order, NewVRegs))
@@ -1790,7 +1790,7 @@ unsigned RAGreedy::selectOrSplit(LiveInterval &VirtReg,
   if (Stage < RS_Split) {
     setStage(VirtReg, RS_Split);
     DEBUG(dbgs() << "wait for second round\n");
-    NewVRegs.push_back(&VirtReg);
+    NewVRegs.push_back(VirtReg.reg);
     return 0;
   }