LLVM 20.0.0git
Macros | Functions | Variables
MachineCopyPropagation.cpp File Reference
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/InitializePasses.h"
#include "llvm/MC/MCRegister.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/Pass.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/DebugCounter.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <iterator>

Go to the source code of this file.


#define DEBUG_TYPE   "machine-cp"


 STATISTIC (NumDeletes, "Number of dead copies deleted")
 STATISTIC (NumCopyForwards, "Number of copy uses forwarded")
 STATISTIC (NumCopyBackwardPropagated, "Number of copy defs backward propagated")
 STATISTIC (SpillageChainsLength, "Length of spillage chains")
 STATISTIC (NumSpillageChains, "Number of spillage chains")
 DEBUG_COUNTER (FwdCounter, "machine-cp-fwd", "Controls which register COPYs are forwarded")
 INITIALIZE_PASS (MachineCopyPropagation, DEBUG_TYPE, "Machine Copy Propagation Pass", false, false) void MachineCopyPropagation
static bool isNopCopy (const MachineInstr &PreviousCopy, MCRegister Src, MCRegister Def, const TargetRegisterInfo *TRI, const TargetInstrInfo *TII, bool UseCopyInstr)
 Return true if PreviousCopy did copy register Src to register Def.
static bool isBackwardPropagatableCopy (const DestSourcePair &CopyOperands, const MachineRegisterInfo &MRI)
static void LLVM_ATTRIBUTE_UNUSED printSpillReloadChain (DenseMap< MachineInstr *, SmallVector< MachineInstr * > > &SpillChain, DenseMap< MachineInstr *, SmallVector< MachineInstr * > > &ReloadChain, MachineInstr *Leader)


static cl::opt< boolMCPUseCopyInstr ("mcp-use-is-copy-instr", cl::init(false), cl::Hidden)
static cl::opt< cl::boolOrDefaultEnableSpillageCopyElimination ("enable-spill-copy-elim", cl::Hidden)

Macro Definition Documentation


#define DEBUG_TYPE   "machine-cp"

Definition at line 79 of file MachineCopyPropagation.cpp.

Function Documentation


DEBUG_COUNTER ( FwdCounter  ,
"machine-cp-fwd"  ,
"Controls which register COPYs are forwarded"   


INITIALIZE_PASS ( MachineCopyPropagation  ,
"Machine Copy Propagation Pass"  ,
false  ,

Definition at line 448 of file MachineCopyPropagation.cpp.

References llvm::dbgs(), LLVM_DEBUG, and TRI.

◆ isBackwardPropagatableCopy()

static bool isBackwardPropagatableCopy ( const DestSourcePair CopyOperands,
const MachineRegisterInfo MRI 

◆ isNopCopy()

static bool isNopCopy ( const MachineInstr PreviousCopy,
MCRegister  Src,
MCRegister  Def,
const TargetRegisterInfo TRI,
const TargetInstrInfo TII,
bool  UseCopyInstr 

Return true if PreviousCopy did copy register Src to register Def.

This fact may have been obscured by sub register usage or may not be true at all even though Src and Def are subregisters of the registers used in PreviousCopy. e.g. isNopCopy("ecx = COPY eax", AX, CX) == true isNopCopy("ecx = COPY eax", AH, CL) == false

Definition at line 490 of file MachineCopyPropagation.cpp.

References TII, and TRI.

◆ printSpillReloadChain()

static void LLVM_ATTRIBUTE_UNUSED printSpillReloadChain ( DenseMap< MachineInstr *, SmallVector< MachineInstr * > > &  SpillChain,
DenseMap< MachineInstr *, SmallVector< MachineInstr * > > &  ReloadChain,
MachineInstr Leader 

Definition at line 1131 of file MachineCopyPropagation.cpp.

References llvm::Pass::dump(), I, and MI.

◆ STATISTIC() [1/5]

STATISTIC ( NumCopyBackwardPropagated  ,
"Number of copy defs backward propagated"   

◆ STATISTIC() [2/5]

STATISTIC ( NumCopyForwards  ,
"Number of copy uses forwarded"   

◆ STATISTIC() [3/5]

STATISTIC ( NumDeletes  ,
"Number of dead copies deleted"   

◆ STATISTIC() [4/5]

STATISTIC ( NumSpillageChains  ,
"Number of spillage chains"   

◆ STATISTIC() [5/5]

STATISTIC ( SpillageChainsLength  ,
"Length of spillage chains"   

Variable Documentation

◆ EnableSpillageCopyElimination

cl::opt< cl::boolOrDefault > EnableSpillageCopyElimination("enable-spill-copy-elim", cl::Hidden) ( "enable-spill-copy-elim"  ,

◆ MCPUseCopyInstr

cl::opt< bool > MCPUseCopyInstr("mcp-use-is-copy-instr", cl::init(false), cl::Hidden) ( "mcp-use-is-copy-instr"  ,
cl::init(false)  ,