//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#define LLVM_CODEGEN_LIVEINTERVAL_H
#include "llvm/ADT/SmallVector.h"
-#include "llvm/Support/Streams.h"
+#include "llvm/Support/Allocator.h"
#include <iosfwd>
-#include <vector>
#include <cassert>
namespace llvm {
class MachineInstr;
- class MRegisterInfo;
+ class TargetRegisterInfo;
struct LiveInterval;
/// VNInfo - If the value number definition is undefined (e.g. phi
/// merge point), it contains ~0u,x. If the value number is not in use, it
/// contains ~1u,x to indicate that the value # is not used.
- /// parent- LiveInterval parent.
/// def - Instruction # of the definition.
- /// reg - Source reg iff val# is defined by a copy; zero otherwise.
- /// kills - Instruction # of the kills. If a kill is an odd #, it means
- /// the kill is a phi join point.
+ /// - or reg # of the definition if it's a stack slot liveinterval.
+ /// copy - Copy iff val# is defined by a copy; zero otherwise.
+ /// hasPHIKill - One or more of the kills are PHI nodes.
+ /// kills - Instruction # of the kills.
struct VNInfo {
- LiveInterval *parent;
unsigned id;
unsigned def;
- unsigned reg;
+ MachineInstr *copy;
+ bool hasPHIKill;
SmallVector<unsigned, 4> kills;
- VNInfo() : parent(0), id(~1U), def(~1U), reg(0) {}
- VNInfo(LiveInterval *p, unsigned i, unsigned d, unsigned r)
- : parent(p), id(i), def(d), reg(r) {}
+ VNInfo() : id(~1U), def(~1U), copy(0), hasPHIKill(false) {}
+ VNInfo(unsigned i, unsigned d, MachineInstr *c)
+ : id(i), def(d), copy(c), hasPHIKill(false) {}
};
/// LiveRange structure - This represents a simple register range in the
typedef SmallVector<LiveRange,4> Ranges;
typedef SmallVector<VNInfo*,4> VNInfoList;
- unsigned reg; // the register of this interval
+ bool isSS; // True if this represents a stack slot
+ unsigned reg; // the register or stack slot of this interval
unsigned preference; // preferred register to allocate for this interval
float weight; // weight of this interval
Ranges ranges; // the ranges in which this register is live
- unsigned numvals; // number of value#'s
VNInfoList valnos; // value#'s
public:
- LiveInterval(unsigned Reg, float Weight)
- : reg(Reg), preference(0), weight(Weight), numvals(0) {
+ LiveInterval(unsigned Reg, float Weight, bool IsSS = false)
+ : isSS(IsSS), reg(Reg), preference(0), weight(Weight) {
}
typedef Ranges::iterator iterator;
const_vni_iterator vni_begin() const { return valnos.begin(); }
const_vni_iterator vni_end() const { return valnos.end(); }
- ~LiveInterval() {
- for (vni_iterator i = vni_begin(), e = vni_end(); i != e; ++i) {
- VNInfo *VNI = *i;
- if (VNI->parent == this)
- delete VNI;
- }
- valnos.clear();
- }
-
/// advanceTo - Advance the specified iterator to point to the LiveRange
/// containing the specified position, or end() if the position is past the
/// end of the interval. If no LiveRange contains this position, but the
return I;
}
- bool containsOneValue() const { return numvals == 1; }
+ /// isStackSlot - Return true if this is a stack slot interval.
+ ///
+ bool isStackSlot() const { return isSS; }
- unsigned getNumValNums() const { return numvals; }
+ /// getStackSlotIndex - Return stack slot index if this is a stack slot
+ /// interval.
+ int getStackSlotIndex() const {
+ assert(isStackSlot() && "Interval is not a stack slot interval!");
+ return reg;
+ }
+
+ bool containsOneValue() const { return valnos.size() == 1; }
+
+ unsigned getNumValNums() const { return (unsigned)valnos.size(); }
- /// getFirstValNumInfo - Returns pointer to the first val#.
+ /// getValNumInfo - Returns pointer to the specified val#.
///
- inline VNInfo *getFirstValNumInfo() {
- return valnos.front();
+ inline VNInfo *getValNumInfo(unsigned ValNo) {
+ return valnos[ValNo];
}
- inline const VNInfo *getFirstValNumInfo() const {
- return valnos.front();
+ inline const VNInfo *getValNumInfo(unsigned ValNo) const {
+ return valnos[ValNo];
}
/// copyValNumInfo - Copy the value number info for one value number to
/// another.
- void copyValNumInfo(VNInfo &DstValNo, VNInfo &SrcValNo) {
- DstValNo.def = SrcValNo.def;
- DstValNo.reg = SrcValNo.reg;
- DstValNo.kills = SrcValNo.kills;
+ void copyValNumInfo(VNInfo *DstValNo, const VNInfo *SrcValNo) {
+ DstValNo->def = SrcValNo->def;
+ DstValNo->copy = SrcValNo->copy;
+ DstValNo->hasPHIKill = SrcValNo->hasPHIKill;
+ DstValNo->kills = SrcValNo->kills;
}
/// getNextValue - Create a new value number and return it. MIIdx specifies
/// the instruction that defines the value number.
- VNInfo *getNextValue(unsigned MIIdx, unsigned SrcReg) {
- VNInfo *VNI = new VNInfo(this, numvals++, MIIdx, SrcReg);
+ VNInfo *getNextValue(unsigned MIIdx, MachineInstr *CopyMI,
+ BumpPtrAllocator &VNInfoAllocator) {
+#ifdef __GNUC__
+ unsigned Alignment = (unsigned)__alignof__(VNInfo);
+#else
+ // FIXME: ugly.
+ unsigned Alignment = 8;
+#endif
+ VNInfo *VNI =
+ static_cast<VNInfo*>(VNInfoAllocator.Allocate((unsigned)sizeof(VNInfo),
+ Alignment));
+ new (VNI) VNInfo((unsigned)valnos.size(), MIIdx, CopyMI);
valnos.push_back(VNI);
return VNI;
}
/// addKillForValNum - Add a kill instruction index to the specified value
/// number.
- static void addKill(VNInfo &VNI, unsigned KillIdx) {
- SmallVector<unsigned, 4> &kills = VNI.kills;
+ static void addKill(VNInfo *VNI, unsigned KillIdx) {
+ SmallVector<unsigned, 4> &kills = VNI->kills;
if (kills.empty()) {
kills.push_back(KillIdx);
} else {
/// addKills - Add a number of kills into the VNInfo kill vector. If this
/// interval is live at a kill point, then the kill is not added.
- void addKills(VNInfo &VNI, const SmallVector<unsigned, 4> &kills) {
- for (unsigned i = 0, e = kills.size(); i != e; ++i) {
+ void addKills(VNInfo *VNI, const SmallVector<unsigned, 4> &kills) {
+ for (unsigned i = 0, e = static_cast<unsigned>(kills.size());
+ i != e; ++i) {
unsigned KillIdx = kills[i];
- if (!liveAt(KillIdx)) {
+ if (!liveBeforeAndAt(KillIdx)) {
SmallVector<unsigned, 4>::iterator
- I = std::lower_bound(VNI.kills.begin(), VNI.kills.end(), KillIdx);
- VNI.kills.insert(I, KillIdx);
+ I = std::lower_bound(VNI->kills.begin(), VNI->kills.end(), KillIdx);
+ VNI->kills.insert(I, KillIdx);
}
}
}
/// removeKill - Remove the specified kill from the list of kills of
/// the specified val#.
- static bool removeKill(VNInfo &VNI, unsigned KillIdx) {
- SmallVector<unsigned, 4> &kills = VNI.kills;
+ static bool removeKill(VNInfo *VNI, unsigned KillIdx) {
+ SmallVector<unsigned, 4> &kills = VNI->kills;
SmallVector<unsigned, 4>::iterator
I = std::lower_bound(kills.begin(), kills.end(), KillIdx);
if (I != kills.end() && *I == KillIdx) {
/// removeKills - Remove all the kills in specified range
/// [Start, End] of the specified val#.
- void removeKills(VNInfo &VNI, unsigned Start, unsigned End) {
- SmallVector<unsigned, 4> &kills = VNI.kills;
+ void removeKills(VNInfo *VNI, unsigned Start, unsigned End) {
+ SmallVector<unsigned, 4> &kills = VNI->kills;
SmallVector<unsigned, 4>::iterator
I = std::lower_bound(kills.begin(), kills.end(), Start);
SmallVector<unsigned, 4>::iterator
E = std::upper_bound(kills.begin(), kills.end(), End);
kills.erase(I, E);
}
+
+ /// isKill - Return true if the specified index is a kill of the
+ /// specified val#.
+ bool isKill(const VNInfo *VNI, unsigned KillIdx) const {
+ const SmallVector<unsigned, 4> &kills = VNI->kills;
+ SmallVector<unsigned, 4>::const_iterator
+ I = std::lower_bound(kills.begin(), kills.end(), KillIdx);
+ return I != kills.end() && *I == KillIdx;
+ }
/// MergeValueNumberInto - This method is called when two value nubmers
/// are found to be equivalent. This eliminates V1, replacing all
/// MergeInClobberRanges - For any live ranges that are not defined in the
/// current interval, but are defined in the Clobbers interval, mark them
- /// used with an unknown definition value.
- void MergeInClobberRanges(const LiveInterval &Clobbers);
-
-
- /// MergeRangesInAsValue - Merge all of the intervals in RHS into this live
- /// interval as the specified value number. The LiveRanges in RHS are
- /// allowed to overlap with LiveRanges in the current interval, but only if
- /// the overlapping LiveRanges have the specified value number.
+ /// used with an unknown definition value. Caller must pass in reference to
+ /// VNInfoAllocator since it will create a new val#.
+ void MergeInClobberRanges(const LiveInterval &Clobbers,
+ BumpPtrAllocator &VNInfoAllocator);
+
+ /// MergeValueInAsValue - Merge all of the live ranges of a specific val#
+ /// in RHS into this live interval as the specified value number.
+ /// The LiveRanges in RHS are allowed to overlap with LiveRanges in the
+ /// current interval, it will replace the value numbers of the overlaped
+ /// live ranges with the specified value number.
void MergeRangesInAsValue(const LiveInterval &RHS, VNInfo *LHSValNo);
+
+ /// MergeValueInAsValue - Merge all of the live ranges of a specific val#
+ /// in RHS into this live interval as the specified value number.
+ /// The LiveRanges in RHS are allowed to overlap with LiveRanges in the
+ /// current interval, but only if the overlapping LiveRanges have the
+ /// specified value number.
+ void MergeValueInAsValue(const LiveInterval &RHS,
+ const VNInfo *RHSValNo, VNInfo *LHSValNo);
+
+ /// Copy - Copy the specified live interval. This copies all the fields
+ /// except for the register of the interval.
+ void Copy(const LiveInterval &RHS, BumpPtrAllocator &VNInfoAllocator);
bool empty() const { return ranges.empty(); }
/// beginNumber - Return the lowest numbered slot covered by interval.
unsigned beginNumber() const {
- assert(!empty() && "empty interval for register");
+ if (empty())
+ return 0;
return ranges.front().start;
}
/// endNumber - return the maximum point of the interval of the whole,
/// exclusive.
unsigned endNumber() const {
- assert(!empty() && "empty interval for register");
+ if (empty())
+ return 0;
return ranges.back().end;
}
bool liveAt(unsigned index) const;
+ // liveBeforeAndAt - Check if the interval is live at the index and the
+ // index just before it. If index is liveAt, check if it starts a new live
+ // range.If it does, then check if the previous live range ends at index-1.
+ bool liveBeforeAndAt(unsigned index) const;
+
/// getLiveRangeContaining - Return the live range that contains the
/// specified index, or null if there is none.
const LiveRange *getLiveRangeContaining(unsigned Idx) const {
/// FindLiveRangeContaining - Return an iterator to the live range that
/// contains the specified index, or end() if there is none.
iterator FindLiveRangeContaining(unsigned Idx);
-
- /// getOverlapingRanges - Given another live interval which is defined as a
- /// copy from this one, return a list of all of the live ranges where the
- /// two overlap and have different value numbers.
- void getOverlapingRanges(const LiveInterval &Other, unsigned CopyIdx,
- std::vector<LiveRange*> &Ranges);
+ /// findDefinedVNInfo - Find the VNInfo that's defined at the specified
+ /// index (register interval) or defined by the specified register (stack
+ /// inteval).
+ VNInfo *findDefinedVNInfo(unsigned DefIdxOrReg) const;
+
/// overlaps - Return true if the intersection of the two live intervals is
/// not empty.
bool overlaps(const LiveInterval& other) const {
/// join - Join two live intervals (this, and other) together. This applies
/// mappings to the value numbers in the LHS/RHS intervals as specified. If
/// the intervals are not joinable, this aborts.
- void join(LiveInterval &Other, int *ValNoAssignments,
- int *RHSValNoAssignments, SmallVector<VNInfo*, 16> &NewVNInfo);
+ void join(LiveInterval &Other, const int *ValNoAssignments,
+ const int *RHSValNoAssignments,
+ SmallVector<VNInfo*, 16> &NewVNInfo);
/// removeRange - Remove the specified range from this interval. Note that
/// the range must already be in this interval in its entirety.
- void removeRange(unsigned Start, unsigned End);
+ void removeRange(unsigned Start, unsigned End, bool RemoveDeadValNo = false);
- void removeRange(LiveRange LR) {
- removeRange(LR.start, LR.end);
+ void removeRange(LiveRange LR, bool RemoveDeadValNo = false) {
+ removeRange(LR.start, LR.end, RemoveDeadValNo);
}
+ /// removeValNo - Remove all the ranges defined by the specified value#.
+ /// Also remove the value# from value# list.
+ void removeValNo(VNInfo *ValNo);
+
/// getSize - Returns the sum of sizes of all the LiveRange's.
///
unsigned getSize() const;
return beginNumber() < other.beginNumber();
}
- void print(std::ostream &OS, const MRegisterInfo *MRI = 0) const;
- void print(std::ostream *OS, const MRegisterInfo *MRI = 0) const {
- if (OS) print(*OS, MRI);
+ void print(std::ostream &OS, const TargetRegisterInfo *TRI = 0) const;
+ void print(std::ostream *OS, const TargetRegisterInfo *TRI = 0) const {
+ if (OS) print(*OS, TRI);
}
void dump() const;
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