LLVM  14.0.0git
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RegAllocGreedy.cpp File Reference
#include "AllocationOrder.h"
#include "InterferenceCache.h"
#include "LiveDebugVariables.h"
#include "RegAllocBase.h"
#include "SpillPlacement.h"
#include "SplitKit.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/IndexedMap.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/OptimizationRemarkEmitter.h"
#include "llvm/CodeGen/CalcSpillWeights.h"
#include "llvm/CodeGen/EdgeBundles.h"
#include "llvm/CodeGen/LiveInterval.h"
#include "llvm/CodeGen/LiveIntervalUnion.h"
#include "llvm/CodeGen/LiveIntervals.h"
#include "llvm/CodeGen/LiveRangeEdit.h"
#include "llvm/CodeGen/LiveRegMatrix.h"
#include "llvm/CodeGen/LiveStacks.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineOptimizationRemarkEmitter.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/RegAllocRegistry.h"
#include "llvm/CodeGen/RegisterClassInfo.h"
#include "llvm/CodeGen/SlotIndexes.h"
#include "llvm/CodeGen/Spiller.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/CodeGen/VirtRegMap.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/Pass.h"
#include "llvm/Support/BlockFrequency.h"
#include "llvm/Support/BranchProbability.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Timer.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <memory>
#include <queue>
#include <tuple>
#include <utility>

Go to the source code of this file.

Namespaces

 llvm
 ---------------------— PointerInfo ------------------------------------—
 

Macros

#define DEBUG_TYPE   "regalloc"
 

Functions

 STATISTIC (NumGlobalSplits, "Number of split global live ranges")
 
 STATISTIC (NumLocalSplits, "Number of split local live ranges")
 
 STATISTIC (NumEvicted, "Number of interferences evicted")
 
 INITIALIZE_PASS_BEGIN (RAGreedy, "greedy", "Greedy Register Allocator", false, false) INITIALIZE_PASS_END(RAGreedy
 
FunctionPassllvm::createGreedyRegisterAllocator (std::function< bool(const TargetRegisterInfo &TRI, const TargetRegisterClass &RC)> Ftor)
 
static unsigned getNumAllocatableRegsForConstraints (const MachineInstr *MI, Register Reg, const TargetRegisterClass *SuperRC, const TargetInstrInfo *TII, const TargetRegisterInfo *TRI, const RegisterClassInfo &RCI)
 Get the number of allocatable registers that match the constraints of Reg on MI and that are also in SuperRC. More...
 
static bool hasTiedDef (MachineRegisterInfo *MRI, unsigned reg)
 Return true if reg has any tied def operand. More...
 

Variables

static cl::opt< SplitEditor::ComplementSpillModeSplitSpillMode ("split-spill-mode", cl::Hidden, cl::desc("Spill mode for splitting live ranges"), cl::values(clEnumValN(SplitEditor::SM_Partition, "default", "Default"), clEnumValN(SplitEditor::SM_Size, "size", "Optimize for size"), clEnumValN(SplitEditor::SM_Speed, "speed", "Optimize for speed")), cl::init(SplitEditor::SM_Speed))
 
static cl::opt< unsigned > LastChanceRecoloringMaxDepth ("lcr-max-depth", cl::Hidden, cl::desc("Last chance recoloring max depth"), cl::init(5))
 
static cl::opt< unsigned > LastChanceRecoloringMaxInterference ("lcr-max-interf", cl::Hidden, cl::desc("Last chance recoloring maximum number of considered" " interference at a time"), cl::init(8))
 
static cl::opt< bool > ExhaustiveSearch ("exhaustive-register-search", cl::NotHidden, cl::desc("Exhaustive Search for registers bypassing the depth " "and interference cutoffs of last chance recoloring"), cl::Hidden)
 
static cl::opt< bool > EnableLocalReassignment ("enable-local-reassign", cl::Hidden, cl::desc("Local reassignment can yield better allocation decisions, but " "may be compile time intensive"), cl::init(false))
 
static cl::opt< bool > EnableDeferredSpilling ("enable-deferred-spilling", cl::Hidden, cl::desc("Instead of spilling a variable right away, defer the actual " "code insertion to the end of the allocation. That way the " "allocator might still find a suitable coloring for this " "variable because of other evicted variables."), cl::init(false))
 
static cl::opt< unsigned > CSRFirstTimeCost ("regalloc-csr-first-time-cost", cl::desc("Cost for first time use of callee-saved register."), cl::init(0), cl::Hidden)
 
static cl::opt< bool > ConsiderLocalIntervalCost ("consider-local-interval-cost", cl::Hidden, cl::desc("Consider the cost of local intervals created by a split " "candidate when choosing the best split candidate."), cl::init(false))
 
static RegisterRegAlloc greedyRegAlloc ("greedy", "greedy register allocator", createGreedyRegisterAllocator)
 
 greedy
 
Greedy Register Allocator
 
Greedy Register false
 
const float Hysteresis = (2007 / 2048.0f)
 

Macro Definition Documentation

◆ DEBUG_TYPE

#define DEBUG_TYPE   "regalloc"

Definition at line 83 of file RegAllocGreedy.cpp.

Function Documentation

◆ getNumAllocatableRegsForConstraints()

static unsigned getNumAllocatableRegsForConstraints ( const MachineInstr MI,
Register  Reg,
const TargetRegisterClass SuperRC,
const TargetInstrInfo TII,
const TargetRegisterInfo TRI,
const RegisterClassInfo RCI 
)
static

Get the number of allocatable registers that match the constraints of Reg on MI and that are also in SuperRC.

Definition at line 2088 of file RegAllocGreedy.cpp.

References assert(), llvm::RegisterClassInfo::getNumAllocatableRegs(), MI, Reg, TII, and TRI.

◆ hasTiedDef()

static bool hasTiedDef ( MachineRegisterInfo MRI,
unsigned  reg 
)
static

Return true if reg has any tied def operand.

Definition at line 2525 of file RegAllocGreedy.cpp.

References llvm::MachineRegisterInfo::def_operands(), and MRI.

◆ INITIALIZE_PASS_BEGIN()

INITIALIZE_PASS_BEGIN ( RAGreedy  ,
"greedy"  ,
"Greedy Register Allocator ,
false  ,
false   
)

◆ STATISTIC() [1/3]

STATISTIC ( NumEvicted  ,
"Number of interferences evicted"   
)

◆ STATISTIC() [2/3]

STATISTIC ( NumGlobalSplits  ,
"Number of split global live ranges"   
)

◆ STATISTIC() [3/3]

STATISTIC ( NumLocalSplits  ,
"Number of split local live ranges"   
)

Variable Documentation

◆ Allocator

Greedy Register Allocator

Definition at line 617 of file RegAllocGreedy.cpp.

◆ ConsiderLocalIntervalCost

cl::opt<bool> ConsiderLocalIntervalCost("consider-local-interval-cost", cl::Hidden, cl::desc("Consider the cost of local intervals created by a split " "candidate when choosing the best split candidate."), cl::init(false))
static

◆ CSRFirstTimeCost

cl::opt<unsigned> CSRFirstTimeCost("regalloc-csr-first-time-cost", cl::desc("Cost for first time use of callee-saved register."), cl::init(0), cl::Hidden)
static

◆ EnableDeferredSpilling

cl::opt<bool> EnableDeferredSpilling("enable-deferred-spilling", cl::Hidden, cl::desc("Instead of spilling a variable right away, defer the actual " "code insertion to the end of the allocation. That way the " "allocator might still find a suitable coloring for this " "variable because of other evicted variables."), cl::init(false))
static

◆ EnableLocalReassignment

cl::opt<bool> EnableLocalReassignment("enable-local-reassign", cl::Hidden, cl::desc("Local reassignment can yield better allocation decisions, but " "may be compile time intensive"), cl::init(false))
static

◆ ExhaustiveSearch

cl::opt<bool> ExhaustiveSearch("exhaustive-register-search", cl::NotHidden, cl::desc("Exhaustive Search for registers bypassing the depth " "and interference cutoffs of last chance recoloring"), cl::Hidden)
static

◆ false

Greedy Register false

Definition at line 617 of file RegAllocGreedy.cpp.

◆ greedy

greedy

Definition at line 616 of file RegAllocGreedy.cpp.

◆ greedyRegAlloc

RegisterRegAlloc greedyRegAlloc("greedy", "greedy register allocator", createGreedyRegisterAllocator)
static

◆ Hysteresis

const float Hysteresis = (2007 / 2048.0f)

Definition at line 633 of file RegAllocGreedy.cpp.

◆ LastChanceRecoloringMaxDepth

cl::opt<unsigned> LastChanceRecoloringMaxDepth("lcr-max-depth", cl::Hidden, cl::desc("Last chance recoloring max depth"), cl::init(5))
static

◆ LastChanceRecoloringMaxInterference

cl::opt<unsigned> LastChanceRecoloringMaxInterference("lcr-max-interf", cl::Hidden, cl::desc("Last chance recoloring maximum number of considered" " interference at a time"), cl::init(8))
static

◆ SplitSpillMode

cl::opt<SplitEditor::ComplementSpillMode> SplitSpillMode("split-spill-mode", cl::Hidden, cl::desc("Spill mode for splitting live ranges"), cl::values(clEnumValN(SplitEditor::SM_Partition, "default", "Default"), clEnumValN(SplitEditor::SM_Size, "size", "Optimize for size"), clEnumValN(SplitEditor::SM_Speed, "speed", "Optimize for speed")), cl::init(SplitEditor::SM_Speed))
static