IR: add "cmpxchg weak" variant to support permitted failure.

[oota-llvm.git] / lib / CodeGen / PrologEpilogInserter.h

diff --git a/lib/CodeGen/PrologEpilogInserter.h b/lib/CodeGen/PrologEpilogInserter.h
index c18c0e8b88be667936c28cbdb3c5c840e0bc17c1..5a6d39a04a22fa9c177c2f09c81e2ac0bafc86da 100644 (file)
--- a/lib/CodeGen/PrologEpilogInserter.h
+++ b/lib/CodeGen/PrologEpilogInserter.h
@@ -14,9 +14,6 @@
 // This pass must be run after register allocation.  After this pass is
 // executed, it is illegal to construct MO_FrameIndex operands.
 //
-// This pass also implements a shrink wrapping variant of prolog/epilog
-// insertion.
-//
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_CODEGEN_PEI_H
@@ -33,19 +30,19 @@ namespace llvm {
   class RegScavenger;
   class MachineBasicBlock;
 
-  class LLVM_LIBRARY_VISIBILITY PEI : public MachineFunctionPass {
+  class PEI : public MachineFunctionPass {
   public:
     static char ID;
     PEI() : MachineFunctionPass(ID) {
       initializePEIPass(*PassRegistry::getPassRegistry());
     }
 
-    virtual void getAnalysisUsage(AnalysisUsage &AU) const;
+    void getAnalysisUsage(AnalysisUsage &AU) const override;
 
     /// runOnMachineFunction - Insert prolog/epilog code and replace abstract
     /// frame indexes with appropriate references.
     ///
-    bool runOnMachineFunction(MachineFunction &Fn);
+    bool runOnMachineFunction(MachineFunction &Fn) override;
 
   private:
     RegScavenger *RS;
@@ -54,74 +51,16 @@ namespace llvm {
     // stack frame indexes.
     unsigned MinCSFrameIndex, MaxCSFrameIndex;
 
-    // Analysis info for spill/restore placement.
-    // "CSR": "callee saved register".
-
-    // CSRegSet contains indices into the Callee Saved Register Info
-    // vector built by calculateCalleeSavedRegisters() and accessed
-    // via MF.getFrameInfo()->getCalleeSavedInfo().
-    typedef SparseBitVector<> CSRegSet;
-
-    // CSRegBlockMap maps MachineBasicBlocks to sets of callee
-    // saved register indices.
-    typedef DenseMap<MachineBasicBlock*, CSRegSet> CSRegBlockMap;
-
-    // Set and maps for computing CSR spill/restore placement:
-    //  used in function (UsedCSRegs)
-    //  used in a basic block (CSRUsed)
-    //  anticipatable in a basic block (Antic{In,Out})
-    //  available in a basic block (Avail{In,Out})
-    //  to be spilled at the entry to a basic block (CSRSave)
-    //  to be restored at the end of a basic block (CSRRestore)
-    CSRegSet UsedCSRegs;
-    CSRegBlockMap CSRUsed;
-    CSRegBlockMap AnticIn, AnticOut;
-    CSRegBlockMap AvailIn, AvailOut;
-    CSRegBlockMap CSRSave;
-    CSRegBlockMap CSRRestore;
-
     // Entry and return blocks of the current function.
     MachineBasicBlock* EntryBlock;
     SmallVector<MachineBasicBlock*, 4> ReturnBlocks;
 
-    // Map of MBBs to top level MachineLoops.
-    DenseMap<MachineBasicBlock*, MachineLoop*> TLLoops;
-
-    // Flag to control shrink wrapping per-function:
-    // may choose to skip shrink wrapping for certain
-    // functions.
-    bool ShrinkWrapThisFunction;
-
     // Flag to control whether to use the register scavenger to resolve
     // frame index materialization registers. Set according to
     // TRI->requiresFrameIndexScavenging() for the curren function.
     bool FrameIndexVirtualScavenging;
 
-#ifndef NDEBUG
-    // Machine function handle.
-    MachineFunction* MF;
-
-    // Flag indicating that the current function
-    // has at least one "short" path in the machine
-    // CFG from the entry block to an exit block.
-    bool HasFastExitPath;
-#endif
-
-    bool calculateSets(MachineFunction &Fn);
-    bool calcAnticInOut(MachineBasicBlock* MBB);
-    bool calcAvailInOut(MachineBasicBlock* MBB);
-    void calculateAnticAvail(MachineFunction &Fn);
-    bool addUsesForMEMERegion(MachineBasicBlock* MBB,
-                              SmallVectorImpl<MachineBasicBlock *> &blks);
-    bool addUsesForTopLevelLoops(SmallVectorImpl<MachineBasicBlock *> &blks);
-    bool calcSpillPlacements(MachineBasicBlock* MBB,
-                             SmallVectorImpl<MachineBasicBlock *> &blks,
-                             CSRegBlockMap &prevSpills);
-    bool calcRestorePlacements(MachineBasicBlock* MBB,
-                               SmallVectorImpl<MachineBasicBlock *> &blks,
-                               CSRegBlockMap &prevRestores);
-    void placeSpillsAndRestores(MachineFunction &Fn);
-    void placeCSRSpillsAndRestores(MachineFunction &Fn);
+    void calculateSets(MachineFunction &Fn);
     void calculateCallsInformation(MachineFunction &Fn);
     void calculateCalleeSavedRegisters(MachineFunction &Fn);
     void insertCSRSpillsAndRestores(MachineFunction &Fn);
@@ -132,44 +71,8 @@ namespace llvm {
     void scavengeFrameVirtualRegs(MachineFunction &Fn);
     void insertPrologEpilogCode(MachineFunction &Fn);
 
-    // Initialize DFA sets, called before iterations.
-    void clearAnticAvailSets();
-    // Clear all sets constructed by shrink wrapping.
-    void clearAllSets();
-
-    // Initialize all shrink wrapping data.
-    void initShrinkWrappingInfo();
-
-    // Convienences for dealing with machine loops.
-    MachineBasicBlock* getTopLevelLoopPreheader(MachineLoop* LP);
-    MachineLoop* getTopLevelLoopParent(MachineLoop *LP);
-
-    // Propgate CSRs used in MBB to all MBBs of loop LP.
-    void propagateUsesAroundLoop(MachineBasicBlock* MBB, MachineLoop* LP);
-
     // Convenience for recognizing return blocks.
     bool isReturnBlock(MachineBasicBlock* MBB);
-
-#ifndef NDEBUG
-    // Debugging methods.
-
-    // Mark this function as having fast exit paths.
-    void findFastExitPath();
-
-    // Verify placement of spills/restores.
-    void verifySpillRestorePlacement();
-
-    std::string getBasicBlockName(const MachineBasicBlock* MBB);
-    std::string stringifyCSRegSet(const CSRegSet& s);
-    void dumpSet(const CSRegSet& s);
-    void dumpUsed(MachineBasicBlock* MBB);
-    void dumpAllUsed();
-    void dumpSets(MachineBasicBlock* MBB);
-    void dumpSets1(MachineBasicBlock* MBB);
-    void dumpAllSets();
-    void dumpSRSets();
-#endif
-
   };
 } // End llvm namespace
 #endif