class RegAllocEvictionAdvisor

Declaration

class RegAllocEvictionAdvisor { /* full declaration omitted */ };

Declared at: llvm/lib/CodeGen/RegAllocEvictionAdvisor.h:99

Member Variables

protected const llvm::MachineFunction& MF

protected const llvm::RAGreedy& RA

protected llvm::LiveRegMatrix* const Matrix

protected llvm::LiveIntervals* const LIS

protected llvm::VirtRegMap* const VRM

protected llvm::MachineRegisterInfo* const MRI

protected const llvm::TargetRegisterInfo* const TRI

protected const llvm::RegisterClassInfo& RegClassInfo

protected const ArrayRef<uint8_t> RegCosts

protected const bool EnableLocalReassign

Run or not the local reassignment heuristic. This information is obtained from the TargetSubtargetInfo.

Method Overview

• public RegAllocEvictionAdvisor(const llvm::RegAllocEvictionAdvisor &)
• public RegAllocEvictionAdvisor(llvm::RegAllocEvictionAdvisor &&)
• protected RegAllocEvictionAdvisor(const llvm::MachineFunction & MF, const llvm::RAGreedy & RA)
• protected bool canAllocatePhysReg(unsigned int CostPerUseLimit, llvm::MCRegister PhysReg) const
• public virtual bool canEvictHintInterference(const llvm::LiveInterval & VirtReg, llvm::MCRegister PhysReg, const llvm::SmallVirtRegSet & FixedRegisters) const
• protected llvm::Register canReassign(const llvm::LiveInterval & VirtReg, llvm::Register PrevReg) const
• protected Optional<unsigned int> getOrderLimit(const llvm::LiveInterval & VirtReg, const llvm::AllocationOrder & Order, unsigned int CostPerUseLimit) const
• public bool isUnusedCalleeSavedReg(llvm::MCRegister PhysReg) const
• public virtual llvm::MCRegister tryFindEvictionCandidate(const llvm::LiveInterval & VirtReg, const llvm::AllocationOrder & Order, uint8_t CostPerUseLimit, const llvm::SmallVirtRegSet & FixedRegisters) const
• public virtual ~RegAllocEvictionAdvisor()

Methods

¶RegAllocEvictionAdvisor(
    const llvm::RegAllocEvictionAdvisor&)

Declared at: llvm/lib/CodeGen/RegAllocEvictionAdvisor.h:101

Parameters

const llvm::RegAllocEvictionAdvisor&

¶RegAllocEvictionAdvisor(
    llvm::RegAllocEvictionAdvisor&&)

Declared at: llvm/lib/CodeGen/RegAllocEvictionAdvisor.h:102

Parameters

llvm::RegAllocEvictionAdvisor&&

¶RegAllocEvictionAdvisor(
    const llvm::MachineFunction& MF,
    const llvm::RAGreedy& RA)

Declared at: llvm/lib/CodeGen/RegAllocEvictionAdvisor.h:123

Parameters

const llvm::MachineFunction& MF

const llvm::RAGreedy& RA

¶bool canAllocatePhysReg(
    unsigned int CostPerUseLimit,
    llvm::MCRegister PhysReg) const

Declared at: llvm/lib/CodeGen/RegAllocEvictionAdvisor.h:136

Parameters

unsigned int CostPerUseLimit

llvm::MCRegister PhysReg

¶virtual bool canEvictHintInterference(
    const llvm::LiveInterval& VirtReg,
    llvm::MCRegister PhysReg,
    const llvm::SmallVirtRegSet& FixedRegisters)
    const

Description

Find out if we can evict the live ranges occupying the given PhysReg, which is a hint (preferred register) for VirtReg.

Declared at: llvm/lib/CodeGen/RegAllocEvictionAdvisor.h:115

Parameters

const llvm::LiveInterval& VirtReg

llvm::MCRegister PhysReg

const llvm::SmallVirtRegSet& FixedRegisters

¶llvm::Register canReassign(
    const llvm::LiveInterval& VirtReg,
    llvm::Register PrevReg) const

Declared at: llvm/lib/CodeGen/RegAllocEvictionAdvisor.h:125

Parameters

const llvm::LiveInterval& VirtReg

llvm::Register PrevReg

¶Optional<unsigned int> getOrderLimit(
    const llvm::LiveInterval& VirtReg,
    const llvm::AllocationOrder& Order,
    unsigned int CostPerUseLimit) const

Declared at: llvm/lib/CodeGen/RegAllocEvictionAdvisor.h:129

Parameters

const llvm::LiveInterval& VirtReg

const llvm::AllocationOrder& Order

unsigned int CostPerUseLimit

¶bool isUnusedCalleeSavedReg(
    llvm::MCRegister PhysReg) const

Description

Returns true if the given \p PhysReg is a callee saved register and has not been used for allocation yet.

Declared at: llvm/lib/CodeGen/RegAllocEvictionAdvisor.h:120

Parameters

llvm::MCRegister PhysReg

¶virtual llvm::MCRegister tryFindEvictionCandidate(
    const llvm::LiveInterval& VirtReg,
    const llvm::AllocationOrder& Order,
    uint8_t CostPerUseLimit,
    const llvm::SmallVirtRegSet& FixedRegisters)
    const

Description

Find a physical register that can be freed by evicting the FixedRegisters, or return NoRegister. The eviction decision is assumed to be correct (i.e. no fixed live ranges are evicted) and profitable.

Declared at: llvm/lib/CodeGen/RegAllocEvictionAdvisor.h:108

Parameters

const llvm::LiveInterval& VirtReg

const llvm::AllocationOrder& Order

uint8_t CostPerUseLimit

const llvm::SmallVirtRegSet& FixedRegisters

¶virtual ~RegAllocEvictionAdvisor()

Declared at: llvm/lib/CodeGen/RegAllocEvictionAdvisor.h:103