Moved LiveRangeEdit.h so that it can be called from other parts of the backend, not just libCodeGen

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153906 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 0 insertions, 202 deletions

diff --git a/lib/CodeGen/LiveRangeEdit.h b/lib/CodeGen/LiveRangeEdit.h
deleted file mode 100644
index 909130ff61..0000000000
--- a/lib/CodeGen/LiveRangeEdit.h
+++ /dev/null
@@ -1,202 +0,0 @@
-//===---- LiveRangeEdit.h - Basic tools for split and spill -----*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// The LiveRangeEdit class represents changes done to a virtual register when it
-// is spilled or split.
-//
-// The parent register is never changed. Instead, a number of new virtual
-// registers are created and added to the newRegs vector.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_CODEGEN_LIVERANGEEDIT_H
-#define LLVM_CODEGEN_LIVERANGEEDIT_H
-
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/SmallPtrSet.h"
-#include "llvm/CodeGen/LiveInterval.h"
-#include "llvm/Target/TargetMachine.h"
-
-namespace llvm {
-
-class AliasAnalysis;
-class LiveIntervals;
-class MachineLoopInfo;
-class MachineRegisterInfo;
-class VirtRegMap;
-
-class LiveRangeEdit {
-public:
-  /// Callback methods for LiveRangeEdit owners.
-  class Delegate {
-    virtual void anchor();
-  public:
-    /// Called immediately before erasing a dead machine instruction.
-    virtual void LRE_WillEraseInstruction(MachineInstr *MI) {}
-
-    /// Called when a virtual register is no longer used. Return false to defer
-    /// its deletion from LiveIntervals.
-    virtual bool LRE_CanEraseVirtReg(unsigned) { return true; }
-
-    /// Called before shrinking the live range of a virtual register.
-    virtual void LRE_WillShrinkVirtReg(unsigned) {}
-
-    /// Called after cloning a virtual register.
-    /// This is used for new registers representing connected components of Old.
-    virtual void LRE_DidCloneVirtReg(unsigned New, unsigned Old) {}
-
-    virtual ~Delegate() {}
-  };
-
-private:
-  LiveInterval &parent_;
-  SmallVectorImpl<LiveInterval*> &newRegs_;
-  MachineRegisterInfo &MRI;
-  LiveIntervals &LIS;
-  VirtRegMap *VRM;
-  const TargetInstrInfo &TII;
-  Delegate *const delegate_;
-
-  /// firstNew_ - Index of the first register added to newRegs_.
-  const unsigned firstNew_;
-
-  /// scannedRemattable_ - true when remattable values have been identified.
-  bool scannedRemattable_;
-
-  /// remattable_ - Values defined by remattable instructions as identified by
-  /// tii.isTriviallyReMaterializable().
-  SmallPtrSet<const VNInfo*,4> remattable_;
-
-  /// rematted_ - Values that were actually rematted, and so need to have their
-  /// live range trimmed or entirely removed.
-  SmallPtrSet<const VNInfo*,4> rematted_;
-
-  /// scanRemattable - Identify the parent_ values that may rematerialize.
-  void scanRemattable(AliasAnalysis *aa);
-
-  /// allUsesAvailableAt - Return true if all registers used by OrigMI at
-  /// OrigIdx are also available with the same value at UseIdx.
-  bool allUsesAvailableAt(const MachineInstr *OrigMI, SlotIndex OrigIdx,
-                          SlotIndex UseIdx);
-
-  /// foldAsLoad - If LI has a single use and a single def that can be folded as
-  /// a load, eliminate the register by folding the def into the use.
-  bool foldAsLoad(LiveInterval *LI, SmallVectorImpl<MachineInstr*> &Dead);
-
-public:
-  /// Create a LiveRangeEdit for breaking down parent into smaller pieces.
-  /// @param parent The register being spilled or split.
-  /// @param newRegs List to receive any new registers created. This needn't be
-  ///                empty initially, any existing registers are ignored.
-  LiveRangeEdit(LiveInterval &parent,
-                SmallVectorImpl<LiveInterval*> &newRegs,
-                MachineFunction &MF,
-                LiveIntervals &lis,
-                VirtRegMap *vrm,
-                Delegate *delegate = 0)
-    : parent_(parent), newRegs_(newRegs),
-      MRI(MF.getRegInfo()), LIS(lis), VRM(vrm),
-      TII(*MF.getTarget().getInstrInfo()),
-      delegate_(delegate),
-      firstNew_(newRegs.size()),
-      scannedRemattable_(false) {}
-
-  LiveInterval &getParent() const { return parent_; }
-  unsigned getReg() const { return parent_.reg; }
-
-  /// Iterator for accessing the new registers added by this edit.
-  typedef SmallVectorImpl<LiveInterval*>::const_iterator iterator;
-  iterator begin() const { return newRegs_.begin()+firstNew_; }
-  iterator end() const { return newRegs_.end(); }
-  unsigned size() const { return newRegs_.size()-firstNew_; }
-  bool empty() const { return size() == 0; }
-  LiveInterval *get(unsigned idx) const { return newRegs_[idx+firstNew_]; }
-
-  ArrayRef<LiveInterval*> regs() const {
-    return makeArrayRef(newRegs_).slice(firstNew_);
-  }
-
-  /// createFrom - Create a new virtual register based on OldReg.
-  LiveInterval &createFrom(unsigned OldReg);
-
-  /// create - Create a new register with the same class and original slot as
-  /// parent.
-  LiveInterval &create() {
-    return createFrom(getReg());
-  }
-
-  /// anyRematerializable - Return true if any parent values may be
-  /// rematerializable.
-  /// This function must be called before any rematerialization is attempted.
-  bool anyRematerializable(AliasAnalysis*);
-
-  /// checkRematerializable - Manually add VNI to the list of rematerializable
-  /// values if DefMI may be rematerializable.
-  bool checkRematerializable(VNInfo *VNI, const MachineInstr *DefMI,
-                             AliasAnalysis*);
-
-  /// Remat - Information needed to rematerialize at a specific location.
-  struct Remat {
-    VNInfo *ParentVNI;      // parent_'s value at the remat location.
-    MachineInstr *OrigMI;   // Instruction defining ParentVNI.
-    explicit Remat(VNInfo *ParentVNI) : ParentVNI(ParentVNI), OrigMI(0) {}
-  };
-
-  /// canRematerializeAt - Determine if ParentVNI can be rematerialized at
-  /// UseIdx. It is assumed that parent_.getVNINfoAt(UseIdx) == ParentVNI.
-  /// When cheapAsAMove is set, only cheap remats are allowed.
-  bool canRematerializeAt(Remat &RM,
-                          SlotIndex UseIdx,
-                          bool cheapAsAMove);
-
-  /// rematerializeAt - Rematerialize RM.ParentVNI into DestReg by inserting an
-  /// instruction into MBB before MI. The new instruction is mapped, but
-  /// liveness is not updated.
-  /// Return the SlotIndex of the new instruction.
-  SlotIndex rematerializeAt(MachineBasicBlock &MBB,
-                            MachineBasicBlock::iterator MI,
-                            unsigned DestReg,
-                            const Remat &RM,
-                            const TargetRegisterInfo&,
-                            bool Late = false);
-
-  /// markRematerialized - explicitly mark a value as rematerialized after doing
-  /// it manually.
-  void markRematerialized(const VNInfo *ParentVNI) {
-    rematted_.insert(ParentVNI);
-  }
-
-  /// didRematerialize - Return true if ParentVNI was rematerialized anywhere.
-  bool didRematerialize(const VNInfo *ParentVNI) const {
-    return rematted_.count(ParentVNI);
-  }
-
-  /// eraseVirtReg - Notify the delegate that Reg is no longer in use, and try
-  /// to erase it from LIS.
-  void eraseVirtReg(unsigned Reg);
-
-  /// eliminateDeadDefs - Try to delete machine instructions that are now dead
-  /// (allDefsAreDead returns true). This may cause live intervals to be trimmed
-  /// and further dead efs to be eliminated.
-  /// RegsBeingSpilled lists registers currently being spilled by the register
-  /// allocator.  These registers should not be split into new intervals
-  /// as currently those new intervals are not guaranteed to spill.
-  void eliminateDeadDefs(SmallVectorImpl<MachineInstr*> &Dead,
-                         ArrayRef<unsigned> RegsBeingSpilled 
-                          = ArrayRef<unsigned>());
-
-  /// calculateRegClassAndHint - Recompute register class and hint for each new
-  /// register.
-  void calculateRegClassAndHint(MachineFunction&,
-                                const MachineLoopInfo&);
-};
-
-}
-
-#endif