GCNRegPressure.h File Reference

This file defines the GCNRegPressure class, which tracks registry pressure by bookkeeping number of SGPR/VGPRs used, weights for large SGPR/VGPRs. More...

#include "GCNSubtarget.h"
#include "llvm/CodeGen/LiveIntervals.h"
#include "llvm/CodeGen/RegisterPressure.h"
#include <algorithm>
#include <array>

Go to the source code of this file.

Classes
struct	llvm::GCNRegPressure
class	llvm::GCNRPTarget
	Models a register pressure target, allowing to evaluate and track register savings against that target from a starting GCNRegPressure. More...
class	llvm::GCNRPTracker
class	llvm::GCNUpwardRPTracker
class	llvm::GCNDownwardRPTrackerBase
	Common behavior for downward RP trackers. Unconstructible directly. More...
class	llvm::GCNDownwardRPTracker
	Downward RP tracker that relies on program order to advance down the instruction stream. More...
class	llvm::GCNManualDownwardRPTracker
	Downward RP tracker that relies on the user to provide the next instruction down the instruction stream. More...
struct	llvm::GCNRegPressurePrinter

Namespaces
namespace	llvm
	This is an optimization pass for GlobalISel generic memory operations.

Functions
GCNRegPressure	llvm::max (const GCNRegPressure &P1, const GCNRegPressure &P2)
GCNRegPressure	llvm::operator+ (const GCNRegPressure &P1, const GCNRegPressure &P2)
GCNRegPressure	llvm::operator- (const GCNRegPressure &P1, const GCNRegPressure &P2)
GCNRPTracker::LiveRegSet	llvm::getLiveRegs (SlotIndex SI, const LiveIntervals &LIS, const MachineRegisterInfo &MRI, GCNRegPressure::RegKind RegKind=GCNRegPressure::TOTAL_KINDS)
LaneBitmask	llvm::getLiveLaneMask (unsigned Reg, SlotIndex SI, const LiveIntervals &LIS, const MachineRegisterInfo &MRI, LaneBitmask LaneMaskFilter=LaneBitmask::getAll())
LaneBitmask	llvm::getLiveLaneMask (const LiveInterval &LI, SlotIndex SI, const MachineRegisterInfo &MRI, LaneBitmask LaneMaskFilter=LaneBitmask::getAll())
template<typename Range>
DenseMap< MachineInstr *, GCNRPTracker::LiveRegSet >	llvm::getLiveRegMap (Range &&R, bool After, LiveIntervals &LIS)
	creates a map MachineInstr -> LiveRegSet R - range of iterators on instructions After - upon entry or exit of every instruction Note: there is no entry in the map for instructions with empty live reg set Complexity = O(NumVirtRegs * averageLiveRangeSegmentsPerReg * lg(R))
GCNRPTracker::LiveRegSet	llvm::getLiveRegsAfter (const MachineInstr &MI, const LiveIntervals &LIS)
GCNRPTracker::LiveRegSet	llvm::getLiveRegsBefore (const MachineInstr &MI, const LiveIntervals &LIS)
template<typename Range>
GCNRegPressure	llvm::getRegPressure (const MachineRegisterInfo &MRI, Range &&LiveRegs)
bool	llvm::isEqual (const GCNRPTracker::LiveRegSet &S1, const GCNRPTracker::LiveRegSet &S2)
Printable	llvm::print (const GCNRegPressure &RP, const GCNSubtarget *ST=nullptr, unsigned DynamicVGPRBlockSize=0)
Printable	llvm::print (const GCNRPTracker::LiveRegSet &LiveRegs, const MachineRegisterInfo &MRI)
Printable	llvm::reportMismatch (const GCNRPTracker::LiveRegSet &LISLR, const GCNRPTracker::LiveRegSet &TrackedL, const TargetRegisterInfo *TRI, StringRef Pfx=" ")
LLVM_ABI void	llvm::dumpMaxRegPressure (MachineFunction &MF, GCNRegPressure::RegKind Kind, LiveIntervals &LIS, const MachineLoopInfo *MLI)
unsigned	llvm::estimateGreedyVGPRPressure (MachineBasicBlock::const_iterator RegionBegin, MachineBasicBlock::const_iterator RegionEnd, const GCNRPTracker::LiveRegSet &LiveIns, const LiveIntervals &LIS, const MachineRegisterInfo &MRI, const SIRegisterInfo &TRI)
	Estimate VGPR pressure using greedy, non-splitting register allocation simulation, accounting for live interval interference.

Detailed Description

This file defines the GCNRegPressure class, which tracks registry pressure by bookkeeping number of SGPR/VGPRs used, weights for large SGPR/VGPRs.

It also implements a compare function, which compares different register pressures, and declares one with max occupancy as winner.

Definition in file GCNRegPressure.h.