LLVM: llvm::VirtRegAuxInfo Class Reference (original) (raw)

Calculate auxiliary information for a virtual register such as its spill weight and allocation hint. More...

#include "[llvm/CodeGen/CalcSpillWeights.h](CalcSpillWeights%5F8h%5Fsource.html)"

Public Member Functions
VirtRegAuxInfo (MachineFunction &MF, LiveIntervals &LIS, const VirtRegMap &VRM, const MachineLoopInfo &Loops, const MachineBlockFrequencyInfo &MBFI, ProfileSummaryInfo *PSI=nullptr)
virtual ~VirtRegAuxInfo ()=default
void calculateSpillWeightAndHint (LiveInterval &LI)
(re)compute li's spill weight and allocation hint.
void calculateSpillWeightsAndHints ()
Compute spill weights and allocation hints for all virtual register live intervals.
Static Public Member Functions
static Register copyHint (const MachineInstr *MI, Register Reg, const TargetRegisterInfo &TRI, const MachineRegisterInfo &MRI)
Return the preferred allocation register for reg, given a COPY instruction.
static bool isRematerializable (const LiveInterval &LI, const LiveIntervals &LIS, const VirtRegMap &VRM, const MachineRegisterInfo &MRI, const TargetInstrInfo &TII)
Determine if all values in LI are rematerializable.
static bool allUsesAvailableAt (const MachineInstr *MI, SlotIndex UseIdx, const LiveIntervals &LIS, const MachineRegisterInfo &MRI, const TargetInstrInfo &TII)

Calculate auxiliary information for a virtual register such as its spill weight and allocation hint.

Definition at line 46 of file CalcSpillWeights.h.

◆ ~VirtRegAuxInfo()

virtual llvm::VirtRegAuxInfo::~VirtRegAuxInfo ( ) virtualdefault

◆ allUsesAvailableAt()

Returns

true if all registers used by MI are also available with the same value at UseIdx.

Definition at line 149 of file CalcSpillWeights.cpp.

References llvm::SlotIndex::getRegSlot(), llvm::LiveRange::getVNInfoAt(), llvm::LiveInterval::hasSubRanges(), llvm::SlotIndex::isSameInstr(), MI, MRI, llvm::LaneBitmask::none(), llvm::LiveInterval::subranges(), SubReg, TII, and TRI.

Referenced by llvm::LiveRangeEdit::canRematerializeAt(), and isRematerializable().

◆ calculateSpillWeightAndHint()

void VirtRegAuxInfo::calculateSpillWeightAndHint ( LiveInterval & LI )

◆ calculateSpillWeightsAndHints()

void VirtRegAuxInfo::calculateSpillWeightsAndHints ( )

◆ copyHint()

◆ isRematerializable()

Determine if all values in LI are rematerializable.

Definition at line 81 of file CalcSpillWeights.cpp.

References allUsesAvailableAt(), assert(), llvm::VNInfo::def, llvm::LiveRange::getVNInfoAt(), I, llvm::VNInfo::id, llvm::VNInfo::isPHIDef(), llvm::VNInfo::isUnused(), MI, MRI, llvm::LiveRange::Query(), llvm::LiveInterval::reg(), TII, llvm::LiveQueryResult::valueIn(), llvm::LiveRange::vni_begin(), and llvm::LiveRange::vni_end().

Referenced by weightCalcHelper().

◆ normalize()

virtual float llvm::VirtRegAuxInfo::normalize ( float UseDefFreq, unsigned Size, unsigned NumInstr ) inlineprotectedvirtual

◆ weightCalcHelper()

Helper function for weight calculations.

(Re)compute LI's spill weight and allocation hint, or, for non null start and end - compute future expected spill weight of a split artifact of LI that will span between start and end slot indexes.

Parameters

LI The live interval for which to compute the weight.
Start The expected beginning of the split artifact. Instructions before start will not affect the weight. Relevant for weight calculation of future split artifact.
End The expected end of the split artifact. Instructions after end will not affect the weight. Relevant for weight calculation of future split artifact.

Returns

The spill weight. Returns negative weight for unspillable LI.

Definition at line 232 of file CalcSpillWeights.cpp.

References _, assert(), canMemFoldInlineAsm(), copyHint(), llvm::SmallVectorImpl< T >::emplace_back(), llvm::MachineOperand::getReg(), llvm::LiveInterval::getSize(), llvm::LiveIntervals::getSpillWeight(), llvm::MachineOperand::getSubReg(), I, llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::LiveRange::isLiveAtIndexes(), llvm::LoopBase< BlockT, LoopT >::isLoopExiting(), isRematerializable(), llvm::LiveInterval::isSpillable(), llvm::Register::isVirtual(), llvm::LiveRange::isZeroLength(), llvm::LiveInterval::markNotSpillable(), MBB, MI, MRI, normalize(), llvm::operator<(), Reg, llvm::LiveInterval::reg(), Register, llvm::sort(), TII, and TRI.

Referenced by calculateSpillWeightAndHint().

The documentation for this class was generated from the following files: