private:
enum {
HAS_PHI_KILL = 1,
- REDEF_BY_EC = 1 << 1,
- IS_PHI_DEF = 1 << 2,
- IS_UNUSED = 1 << 3
+ IS_UNUSED = 1 << 1
};
- MachineInstr *copy;
unsigned char flags;
public:
SlotIndex def;
/// VNInfo constructor.
- VNInfo(unsigned i, SlotIndex d, MachineInstr *c)
- : copy(c), flags(0), id(i), def(d)
+ VNInfo(unsigned i, SlotIndex d)
+ : flags(0), id(i), def(d)
{ }
/// VNInfo construtor, copies values from orig, except for the value number.
VNInfo(unsigned i, const VNInfo &orig)
- : copy(orig.copy), flags(orig.flags), id(i), def(orig.def)
+ : flags(orig.flags), id(i), def(orig.def)
{ }
/// Copy from the parameter into this VNInfo.
void copyFrom(VNInfo &src) {
flags = src.flags;
- copy = src.copy;
def = src.def;
}
flags = (flags | VNI->flags) & ~IS_UNUSED;
}
- /// For a register interval, if this VN was definied by a copy instr
- /// getCopy() returns a pointer to it, otherwise returns 0.
- /// For a stack interval the behaviour of this method is undefined.
- MachineInstr* getCopy() const { return copy; }
- /// For a register interval, set the copy member.
- /// This method should not be called on stack intervals as it may lead to
- /// undefined behavior.
- void setCopy(MachineInstr *c) { copy = c; }
-
- /// isDefByCopy - Return true when this value was defined by a copy-like
- /// instruction as determined by MachineInstr::isCopyLike.
- bool isDefByCopy() const { return copy != 0; }
-
/// Returns true if one or more kills are PHI nodes.
/// Obsolete, do not use!
bool hasPHIKill() const { return flags & HAS_PHI_KILL; }
flags &= ~HAS_PHI_KILL;
}
- /// Returns true if this value is re-defined by an early clobber somewhere
- /// during the live range.
- bool hasRedefByEC() const { return flags & REDEF_BY_EC; }
- /// Set the "redef by early clobber" flag on this value.
- void setHasRedefByEC(bool hasRedef) {
- if (hasRedef)
- flags |= REDEF_BY_EC;
- else
- flags &= ~REDEF_BY_EC;
- }
-
/// Returns true if this value is defined by a PHI instruction (or was,
/// PHI instrucions may have been eliminated).
- bool isPHIDef() const { return flags & IS_PHI_DEF; }
- /// Set the "phi def" flag on this value.
- void setIsPHIDef(bool phiDef) {
- if (phiDef)
- flags |= IS_PHI_DEF;
- else
- flags &= ~IS_PHI_DEF;
- }
+ /// PHI-defs begin at a block boundary, all other defs begin at register or
+ /// EC slots.
+ bool isPHIDef() const { return def.isBlock(); }
/// Returns true if this value is unused.
bool isUnused() const { return flags & IS_UNUSED; }
/// getNextValue - Create a new value number and return it. MIIdx specifies
/// the instruction that defines the value number.
- VNInfo *getNextValue(SlotIndex def, MachineInstr *CopyMI,
- VNInfo::Allocator &VNInfoAllocator) {
+ VNInfo *getNextValue(SlotIndex def, VNInfo::Allocator &VNInfoAllocator) {
VNInfo *VNI =
- new (VNInfoAllocator) VNInfo((unsigned)valnos.size(), def, CopyMI);
+ new (VNInfoAllocator) VNInfo((unsigned)valnos.size(), def);
valnos.push_back(VNI);
return VNI;
}
+ /// createDeadDef - Make sure the interval has a value defined at Def.
+ /// If one already exists, return it. Otherwise allocate a new value and
+ /// add liveness for a dead def.
+ VNInfo *createDeadDef(SlotIndex Def, VNInfo::Allocator &VNInfoAllocator);
+
/// Create a copy of the given value. The new value will be identical except
/// for the Value number.
VNInfo *createValueCopy(const VNInfo *orig,
/// unused values.
void RenumberValues(LiveIntervals &lis);
- /// isOnlyLROfValNo - Return true if the specified live range is the only
- /// one defined by the its val#.
- bool isOnlyLROfValNo(const LiveRange *LR) {
- for (const_iterator I = begin(), E = end(); I != E; ++I) {
- const LiveRange *Tmp = I;
- if (Tmp != LR && Tmp->valno == LR->valno)
- return false;
- }
- return true;
- }
-
/// MergeValueNumberInto - This method is called when two value nubmers
/// are found to be equivalent. This eliminates V1, replacing all
/// LiveRanges with the V1 value number with the V2 value number. This can
return I == end() ? 0 : &*I;
}
- const LiveRange *getLiveRangeBefore(SlotIndex Idx) const {
- return getLiveRangeContaining(Idx.getPrevSlot());
- }
-
- LiveRange *getLiveRangeBefore(SlotIndex Idx) {
- return getLiveRangeContaining(Idx.getPrevSlot());
- }
-
/// getVNInfoAt - Return the VNInfo that is live at Idx, or NULL.
VNInfo *getVNInfoAt(SlotIndex Idx) const {
const_iterator I = FindLiveRangeContaining(Idx);
return I != end() && I->start <= Idx ? I : end();
}
- /// findDefinedVNInfo - Find the by the specified
- /// index (register interval) or defined
- VNInfo *findDefinedVNInfoForRegInt(SlotIndex Idx) const;
-
-
/// overlaps - Return true if the intersection of the two live intervals is
/// not empty.
bool overlaps(const LiveInterval& other) const {
weight = HUGE_VALF;
}
- /// ComputeJoinedWeight - Set the weight of a live interval after
- /// Other has been merged into it.
- void ComputeJoinedWeight(const LiveInterval &Other);
-
bool operator<(const LiveInterval& other) const {
const SlotIndex &thisIndex = beginIndex();
const SlotIndex &otherIndex = other.beginIndex();
(thisIndex == otherIndex && reg < other.reg));
}
- void print(raw_ostream &OS, const TargetRegisterInfo *TRI = 0) const;
+ void print(raw_ostream &OS) const;
void dump() const;
+ /// \brief Walk the interval and assert if any invariants fail to hold.
+ ///
+ /// Note that this is a no-op when asserts are disabled.
+#ifdef NDEBUG
+ void verify() const {}
+#else
+ void verify() const;
+#endif
+
private:
Ranges::iterator addRangeFrom(LiveRange LR, Ranges::iterator From);
void extendIntervalEndTo(Ranges::iterator I, SlotIndex NewEnd);
Ranges::iterator extendIntervalStartTo(Ranges::iterator I, SlotIndex NewStr);
void markValNoForDeletion(VNInfo *V);
+ void mergeIntervalRanges(const LiveInterval &RHS,
+ VNInfo *LHSValNo = 0,
+ const VNInfo *RHSValNo = 0);
LiveInterval& operator=(const LiveInterval& rhs); // DO NOT IMPLEMENT
return OS;
}
+ /// LiveRangeQuery - Query information about a live range around a given
+ /// instruction. This class hides the implementation details of live ranges,
+ /// and it should be used as the primary interface for examining live ranges
+ /// around instructions.
+ ///
+ class LiveRangeQuery {
+ VNInfo *EarlyVal;
+ VNInfo *LateVal;
+ SlotIndex EndPoint;
+ bool Kill;
+
+ public:
+ /// Create a LiveRangeQuery for the given live range and instruction index.
+ /// The sub-instruction slot of Idx doesn't matter, only the instruction it
+ /// refers to is considered.
+ LiveRangeQuery(const LiveInterval &LI, SlotIndex Idx)
+ : EarlyVal(0), LateVal(0), Kill(false) {
+ // Find the segment that enters the instruction.
+ LiveInterval::const_iterator I = LI.find(Idx.getBaseIndex());
+ LiveInterval::const_iterator E = LI.end();
+ if (I == E)
+ return;
+ // Is this an instruction live-in segment?
+ if (SlotIndex::isEarlierInstr(I->start, Idx)) {
+ EarlyVal = I->valno;
+ EndPoint = I->end;
+ // Move to the potentially live-out segment.
+ if (SlotIndex::isSameInstr(Idx, I->end)) {
+ Kill = true;
+ if (++I == E)
+ return;
+ }
+ }
+ // I now points to the segment that may be live-through, or defined by
+ // this instr. Ignore segments starting after the current instr.
+ if (SlotIndex::isEarlierInstr(Idx, I->start))
+ return;
+ LateVal = I->valno;
+ EndPoint = I->end;
+ }
+
+ /// Return the value that is live-in to the instruction. This is the value
+ /// that will be read by the instruction's use operands. Return NULL if no
+ /// value is live-in.
+ VNInfo *valueIn() const {
+ return EarlyVal;
+ }
+
+ /// Return true if the live-in value is killed by this instruction. This
+ /// means that either the live range ends at the instruction, or it changes
+ /// value.
+ bool isKill() const {
+ return Kill;
+ }
+
+ /// Return true if this instruction has a dead def.
+ bool isDeadDef() const {
+ return EndPoint.isDead();
+ }
+
+ /// Return the value leaving the instruction, if any. This can be a
+ /// live-through value, or a live def. A dead def returns NULL.
+ VNInfo *valueOut() const {
+ return isDeadDef() ? 0 : LateVal;
+ }
+
+ /// Return the value defined by this instruction, if any. This includes
+ /// dead defs, it is the value created by the instruction's def operands.
+ VNInfo *valueDefined() const {
+ return EarlyVal == LateVal ? 0 : LateVal;
+ }
+
+ /// Return the end point of the last live range segment to interact with
+ /// the instruction, if any.
+ ///
+ /// The end point is an invalid SlotIndex only if the live range doesn't
+ /// intersect the instruction at all.
+ ///
+ /// The end point may be at or past the end of the instruction's basic
+ /// block. That means the value was live out of the block.
+ SlotIndex endPoint() const {
+ return EndPoint;
+ }
+ };
+
/// ConnectedVNInfoEqClasses - Helper class that can divide VNInfos in a
/// LiveInterval into equivalence clases of connected components. A
/// LiveInterval that has multiple connected components can be broken into
projects / oota-llvm.git / blobdiff