Revert "CalculateSpillWeights does not need to be a pass"

Temporarily revert my previous commit until I understand why it breaks 3 target tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194272 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/CalcSpillWeights.h

@@ -21,9 +21,7 @@ namespace llvm {
   class MachineBlockFrequencyInfo;
   class MachineLoopInfo;
 
-  /// \brief Normalize the spill weight of a live interval
-  ///
-  /// The spill weight of a live interval is computed as:
+  /// normalizeSpillWeight - The spill weight of a live interval is computed as:
   ///
   ///   (sum(use freq) + sum(def freq)) / (K + size)
   ///
@@ -40,8 +38,8 @@ namespace llvm {
     return UseDefFreq / (Size + 25*SlotIndex::InstrDist);
   }
 
-  /// \brief Calculate auxiliary information for a virtual register such as its
-  /// spill weight and allocation hint.
+  /// VirtRegAuxInfo - Calculate auxiliary information for a virtual
+  /// register such as its spill weight and allocation hint.
   class VirtRegAuxInfo {
     MachineFunction &MF;
     LiveIntervals &LIS;
@@ -54,16 +52,29 @@ namespace llvm {
                    const MachineBlockFrequencyInfo &mbfi)
         : MF(mf), LIS(lis), Loops(loops), MBFI(mbfi) {}
 
-    /// \brief (re)compute li's spill weight and allocation hint.
+    /// CalculateWeightAndHint - (re)compute li's spill weight and allocation
+    /// hint.
     void CalculateWeightAndHint(LiveInterval &li);
   };
 
-  /// \brief Compute spill weights and allocation hints for all virtual register
+  /// CalculateSpillWeights - Compute spill weights for all virtual register
   /// live intervals.
-  void calculateSpillWeights(LiveIntervals &LIS,
-                             MachineFunction &MF,
-                             const MachineLoopInfo &MLI,
-                             const MachineBlockFrequencyInfo &MBFI);
+  class CalculateSpillWeights : public MachineFunctionPass {
+  public:
+    static char ID;
+
+    CalculateSpillWeights() : MachineFunctionPass(ID) {
+      initializeCalculateSpillWeightsPass(*PassRegistry::getPassRegistry());
+    }
+
+    virtual void getAnalysisUsage(AnalysisUsage &au) const;
+
+    virtual bool runOnMachineFunction(MachineFunction &fn);
+
+  private:
+    /// Returns true if the given live interval is zero length.
+    bool isZeroLengthInterval(LiveInterval *li) const;
+  };
 
 }
 

include/llvm/InitializePasses.h

@@ -89,6 +89,7 @@ void initializeCFGSimplifyPassPass(PassRegistry&);
 void initializeFlattenCFGPassPass(PassRegistry&);
 void initializeStructurizeCFGPass(PassRegistry&);
 void initializeCFGViewerPass(PassRegistry&);
+void initializeCalculateSpillWeightsPass(PassRegistry&);
 void initializeCodeGenPreparePass(PassRegistry&);
 void initializeConstantMergePass(PassRegistry&);
 void initializeConstantPropagationPass(PassRegistry&);

lib/CodeGen/CalcSpillWeights.cpp

@@ -22,21 +22,38 @@
 #include "llvm/Target/TargetRegisterInfo.h"
 using namespace llvm;
 
-void llvm::calculateSpillWeights(LiveIntervals &LIS,
-                           MachineFunction &MF,
-                           const MachineLoopInfo &MLI,
-                           const MachineBlockFrequencyInfo &MBFI) {
+char CalculateSpillWeights::ID = 0;
+INITIALIZE_PASS_BEGIN(CalculateSpillWeights, "calcspillweights",
+                "Calculate spill weights", false, false)
+INITIALIZE_PASS_DEPENDENCY(LiveIntervals)
+INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo)
+INITIALIZE_PASS_END(CalculateSpillWeights, "calcspillweights",
+                "Calculate spill weights", false, false)
+
+void CalculateSpillWeights::getAnalysisUsage(AnalysisUsage &au) const {
+  au.addRequired<LiveIntervals>();
+  au.addRequired<MachineBlockFrequencyInfo>();
+  au.addRequired<MachineLoopInfo>();
+  au.setPreservesAll();
+  MachineFunctionPass::getAnalysisUsage(au);
+}
+
+bool CalculateSpillWeights::runOnMachineFunction(MachineFunction &MF) {
+
   DEBUG(dbgs() << "********** Compute Spill Weights **********\n"
                << "********** Function: " << MF.getName() << '\n');
 
+  LiveIntervals &LIS = getAnalysis<LiveIntervals>();
   MachineRegisterInfo &MRI = MF.getRegInfo();
-  VirtRegAuxInfo VRAI(MF, LIS, MLI, MBFI);
+  VirtRegAuxInfo VRAI(MF, LIS, getAnalysis<MachineLoopInfo>(),
+                      getAnalysis<MachineBlockFrequencyInfo>());
   for (unsigned i = 0, e = MRI.getNumVirtRegs(); i != e; ++i) {
     unsigned Reg = TargetRegisterInfo::index2VirtReg(i);
     if (MRI.reg_nodbg_empty(Reg))
       continue;
     VRAI.CalculateWeightAndHint(LIS.getInterval(Reg));
   }
+  return false;
 }
 
 // Return the preferred allocation register for reg, given a COPY instruction.

lib/CodeGen/CodeGen.cpp

@@ -22,6 +22,7 @@ using namespace llvm;
 void llvm::initializeCodeGen(PassRegistry &Registry) {
   initializeBasicTTIPass(Registry);
   initializeBranchFolderPassPass(Registry);
+  initializeCalculateSpillWeightsPass(Registry);
   initializeDeadMachineInstructionElimPass(Registry);
   initializeEarlyIfConverterPass(Registry);
   initializeExpandPostRAPass(Registry);

lib/CodeGen/RegAllocBasic.cpp

@@ -126,6 +126,7 @@ RABasic::RABasic(): MachineFunctionPass(ID) {
   initializeSlotIndexesPass(*PassRegistry::getPassRegistry());
   initializeRegisterCoalescerPass(*PassRegistry::getPassRegistry());
   initializeMachineSchedulerPass(*PassRegistry::getPassRegistry());
+  initializeCalculateSpillWeightsPass(*PassRegistry::getPassRegistry());
   initializeLiveStacksPass(*PassRegistry::getPassRegistry());
   initializeMachineDominatorTreePass(*PassRegistry::getPassRegistry());
   initializeMachineLoopInfoPass(*PassRegistry::getPassRegistry());
@@ -142,6 +143,7 @@ void RABasic::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.addPreserved<SlotIndexes>();
   AU.addRequired<LiveDebugVariables>();
   AU.addPreserved<LiveDebugVariables>();
+  AU.addRequired<CalculateSpillWeights>();
   AU.addRequired<LiveStacks>();
   AU.addPreserved<LiveStacks>();
   AU.addRequired<MachineBlockFrequencyInfo>();

lib/CodeGen/RegAllocGreedy.cpp

@@ -315,6 +315,7 @@ RAGreedy::RAGreedy(): MachineFunctionPass(ID) {
   initializeSlotIndexesPass(*PassRegistry::getPassRegistry());
   initializeRegisterCoalescerPass(*PassRegistry::getPassRegistry());
   initializeMachineSchedulerPass(*PassRegistry::getPassRegistry());
+  initializeCalculateSpillWeightsPass(*PassRegistry::getPassRegistry());
   initializeLiveStacksPass(*PassRegistry::getPassRegistry());
   initializeMachineDominatorTreePass(*PassRegistry::getPassRegistry());
   initializeMachineLoopInfoPass(*PassRegistry::getPassRegistry());
@@ -338,6 +339,7 @@ void RAGreedy::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.addPreserved<LiveDebugVariables>();
   AU.addRequired<LiveStacks>();
   AU.addPreserved<LiveStacks>();
+  AU.addRequired<CalculateSpillWeights>();
   AU.addRequired<MachineDominatorTree>();
   AU.addPreserved<MachineDominatorTree>();
   AU.addRequired<MachineLoopInfo>();
@@ -1838,8 +1840,6 @@ bool RAGreedy::runOnMachineFunction(MachineFunction &mf) {
   SpillPlacer = &getAnalysis<SpillPlacement>();
   DebugVars = &getAnalysis<LiveDebugVariables>();
 
-  calculateSpillWeights(*LIS, mf, *Loops, *MBFI);
-
   DEBUG(LIS->dump());
 
   SA.reset(new SplitAnalysis(*VRM, *LIS, *Loops));

lib/CodeGen/RegAllocPBQP.cpp

@@ -95,6 +95,7 @@ public:
       : MachineFunctionPass(ID), builder(b.take()), customPassID(cPassID) {
     initializeSlotIndexesPass(*PassRegistry::getPassRegistry());
     initializeLiveIntervalsPass(*PassRegistry::getPassRegistry());
+    initializeCalculateSpillWeightsPass(*PassRegistry::getPassRegistry());
     initializeLiveStacksPass(*PassRegistry::getPassRegistry());
     initializeVirtRegMapPass(*PassRegistry::getPassRegistry());
   }
@@ -431,6 +432,7 @@ void RegAllocPBQP::getAnalysisUsage(AnalysisUsage &au) const {
   //au.addRequiredID(SplitCriticalEdgesID);
   if (customPassID)
     au.addRequiredID(*customPassID);
+  au.addRequired<CalculateSpillWeights>();
   au.addRequired<LiveStacks>();
   au.addPreserved<LiveStacks>();
   au.addRequired<MachineBlockFrequencyInfo>();
@@ -549,8 +551,6 @@ bool RegAllocPBQP::runOnMachineFunction(MachineFunction &MF) {
   lss = &getAnalysis<LiveStacks>();
   mbfi = &getAnalysis<MachineBlockFrequencyInfo>();
 
-  calculateSpillWeights(*lis, MF, getAnalysis<MachineLoopInfo>(), *mbfi);
-
   vrm = &getAnalysis<VirtRegMap>();
   spiller.reset(createInlineSpiller(*this, MF, *vrm));