typedef DomTreeNodeBase<MachineBasicBlock> MachineDomTreeNode;
class LiveRangeCalc {
+ const MachineFunction *MF;
const MachineRegisterInfo *MRI;
SlotIndexes *Indexes;
MachineDominatorTree *DomTree;
/// used to add entries directly.
SmallVector<LiveInBlock, 16> LiveIn;
- /// findReachingDefs - Assuming that LI is live-in to KillMBB and killed at
- /// Kill, search for values that can reach KillMBB. All blocks that need LI
- /// to be live-in are added to LiveIn. If a unique reaching def is found,
- /// its value is returned, if Kill is jointly dominated by multiple values,
- /// NULL is returned.
- VNInfo *findReachingDefs(LiveInterval *LI,
- MachineBasicBlock *KillMBB,
- SlotIndex Kill);
+ /// Assuming that LI is live-in to KillMBB and killed at Kill, find the set
+ /// of defs that can reach it.
+ ///
+ /// If only one def can reach Kill, all paths from the def to kill are added
+ /// to LI, and the function returns true.
+ ///
+ /// If multiple values can reach Kill, the blocks that need LI to be live in
+ /// are added to the LiveIn array, and the function returns false.
+ ///
+ /// PhysReg, when set, is used to verify live-in lists on basic blocks.
+ bool findReachingDefs(LiveInterval *LI,
+ MachineBasicBlock *KillMBB,
+ SlotIndex Kill,
+ unsigned PhysReg);
/// updateSSA - Compute the values that will be live in to all requested
/// blocks in LiveIn. Create PHI-def values as required to preserve SSA form.
/// blocks. No values are read from the live ranges.
void updateSSA();
- /// updateLiveIns - Add liveness as specified in the LiveIn vector, using VNI
- /// as a wildcard value for LiveIn entries without a value.
- void updateLiveIns(VNInfo *VNI);
+ /// Add liveness as specified in the LiveIn vector.
+ void updateLiveIns();
public:
- LiveRangeCalc() : MRI(0), Indexes(0), DomTree(0), Alloc(0) {}
+ LiveRangeCalc() : MF(0), MRI(0), Indexes(0), DomTree(0), Alloc(0) {}
//===--------------------------------------------------------------------===//
// High-level interface.
/// Kill is not dominated by a single existing value, PHI-defs are inserted
/// as required to preserve SSA form. If Kill is known to be dominated by a
/// single existing value, Alloc may be null.
- void extend(LiveInterval *LI, SlotIndex Kill);
+ ///
+ /// PhysReg, when set, is used to verify live-in lists on basic blocks.
+ void extend(LiveInterval *LI, SlotIndex Kill, unsigned PhysReg = 0);
+
+ /// createDeadDefs - Create a dead def in LI for every def operand of Reg.
+ /// Each instruction defining Reg gets a new VNInfo with a corresponding
+ /// minimal live range.
+ void createDeadDefs(LiveInterval *LI, unsigned Reg);
- /// extendToUses - Extend the live range of LI to reach all uses.
+ /// createDeadDefs - Create a dead def in LI for every def of LI->reg.
+ void createDeadDefs(LiveInterval *LI) {
+ createDeadDefs(LI, LI->reg);
+ }
+
+ /// extendToUses - Extend the live range of LI to reach all uses of Reg.
///
/// All uses must be jointly dominated by existing liveness. PHI-defs are
/// inserted as needed to preserve SSA form.
- void extendToUses(LiveInterval *LI);
+ void extendToUses(LiveInterval *LI, unsigned Reg);
+
+ /// extendToUses - Extend the live range of LI to reach all uses of LI->reg.
+ void extendToUses(LiveInterval *LI) {
+ extendToUses(LI, LI->reg);
+ }
//===--------------------------------------------------------------------===//
// Low-level interface.