class LiveInterval;
class LiveIntervals;
class LiveRangeEdit;
+class MachineBlockFrequencyInfo;
class MachineInstr;
class MachineLoopInfo;
class MachineRegisterInfo;
const MachineLoopInfo &Loops;
const TargetInstrInfo &TII;
- // Sorted slot indexes of using instructions.
- SmallVector<SlotIndex, 8> UseSlots;
-
/// Additional information about basic blocks where the current variable is
/// live. Such a block will look like one of these templates:
///
// Current live interval.
const LiveInterval *CurLI;
+ // Sorted slot indexes of using instructions.
+ SmallVector<SlotIndex, 8> UseSlots;
+
/// LastSplitPoint - Last legal split point in each basic block in the current
/// function. The first entry is the first terminator, the second entry is the
/// last valid split point for a variable that is live in to a landing pad
/// getParent - Return the last analyzed interval.
const LiveInterval &getParent() const { return *CurLI; }
- /// getLastSplitPoint - Return that base index of the last valid split point
+ /// getLastSplitPoint - Return the base index of the last valid split point
/// in the basic block numbered Num.
SlotIndex getLastSplitPoint(unsigned Num) {
// Inline the common simple case.
return computeLastSplitPoint(Num);
}
+ /// getLastSplitPointIter - Returns the last split point as an iterator.
+ MachineBasicBlock::iterator getLastSplitPointIter(MachineBasicBlock*);
+
/// isOriginalEndpoint - Return true if the original live range was killed or
/// (re-)defined at Idx. Idx should be the 'def' slot for a normal kill/def,
/// and 'use' for an early-clobber def.
/// splitting.
bool isOriginalEndpoint(SlotIndex Idx) const;
+ /// getUseSlots - Return an array of SlotIndexes of instructions using CurLI.
+ /// This include both use and def operands, at most one entry per instruction.
+ ArrayRef<SlotIndex> getUseSlots() const { return UseSlots; }
+
/// getUseBlocks - Return an array of BlockInfo objects for the basic blocks
/// where CurLI has uses.
ArrayRef<BlockInfo> getUseBlocks() const { return UseBlocks; }
MachineDominatorTree &MDT;
const TargetInstrInfo &TII;
const TargetRegisterInfo &TRI;
+ const MachineBlockFrequencyInfo &MBFI;
public:
/// Idx.
RegAssignMap RegAssign;
- typedef DenseMap<std::pair<unsigned, unsigned>, VNInfo*> ValueMap;
+ typedef PointerIntPair<VNInfo*, 1> ValueForcePair;
+ typedef DenseMap<std::pair<unsigned, unsigned>, ValueForcePair> ValueMap;
/// Values - keep track of the mapping from parent values to values in the new
/// intervals. Given a pair (RegIdx, ParentVNI->id), Values contains:
///
/// 1. No entry - the value is not mapped to Edit.get(RegIdx).
- /// 2. Null - the value is mapped to multiple values in Edit.get(RegIdx).
- /// Each value is represented by a minimal live range at its def.
- /// 3. A non-null VNInfo - the value is mapped to a single new value.
+ /// 2. (Null, false) - the value is mapped to multiple values in
+ /// Edit.get(RegIdx). Each value is represented by a minimal live range at
+ /// its def. The full live range can be inferred exactly from the range
+ /// of RegIdx in RegAssign.
+ /// 3. (Null, true). As above, but the ranges in RegAssign are too large, and
+ /// the live range must be recomputed using LiveRangeCalc::extend().
+ /// 4. (VNI, false) The value is mapped to a single new value.
/// The new value has no live ranges anywhere.
ValueMap Values;
/// Return the new LI value.
VNInfo *defValue(unsigned RegIdx, const VNInfo *ParentVNI, SlotIndex Idx);
- /// markComplexMapped - Mark ParentVNI as complex mapped in RegIdx regardless
- /// of the number of defs.
- void markComplexMapped(unsigned RegIdx, const VNInfo *ParentVNI);
+ /// forceRecompute - Force the live range of ParentVNI in RegIdx to be
+ /// recomputed by LiveRangeCalc::extend regardless of the number of defs.
+ /// This is used for values whose live range doesn't match RegAssign exactly.
+ /// They could have rematerialized, or back-copies may have been moved.
+ void forceRecompute(unsigned RegIdx, const VNInfo *ParentVNI);
/// defFromParent - Define Reg from ParentVNI at UseIdx using either
/// rematerialization or a COPY from parent. Return the new value.
MachineBasicBlock &MBB,
MachineBasicBlock::iterator I);
- /// extendRange - Extend the live range of Edit.get(RegIdx) so it reaches Idx.
- /// Insert PHIDefs as needed to preserve SSA form.
- void extendRange(unsigned RegIdx, SlotIndex Idx);
+ /// removeBackCopies - Remove the copy instructions that defines the values
+ /// in the vector in the complement interval.
+ void removeBackCopies(SmallVectorImpl<VNInfo*> &Copies);
+
+ /// getShallowDominator - Returns the least busy dominator of MBB that is
+ /// also dominated by DefMBB. Busy is measured by loop depth.
+ MachineBasicBlock *findShallowDominator(MachineBasicBlock *MBB,
+ MachineBasicBlock *DefMBB);
+
+ /// hoistCopiesForSize - Hoist back-copies to the complement interval in a
+ /// way that minimizes code size. This implements the SM_Size spill mode.
+ void hoistCopiesForSize();
/// transferValues - Transfer values to the new ranges.
/// Return true if any ranges were skipped.
/// Create a new SplitEditor for editing the LiveInterval analyzed by SA.
/// Newly created intervals will be appended to newIntervals.
SplitEditor(SplitAnalysis &SA, LiveIntervals&, VirtRegMap&,
- MachineDominatorTree&);
+ MachineDominatorTree&, MachineBlockFrequencyInfo &);
/// reset - Prepare for a new split.
void reset(LiveRangeEdit&, ComplementSpillMode = SM_Partition);