SystemZElimCompare.cpp File Reference

#include "SystemZ.h"
#include "SystemZInstrInfo.h"
#include "SystemZTargetMachine.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/CodeGen/LiveRegUnits.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/MC/MCInstrDesc.h"
#include <cassert>
#include <cstdint>

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "systemz-elim-compare"

Functions
	STATISTIC (BranchOnCounts, "Number of branch-on-count instructions")
	STATISTIC (LoadAndTraps, "Number of load-and-trap instructions")
	STATISTIC (EliminatedComparisons, "Number of eliminated comparisons")
	STATISTIC (FusedComparisons, "Number of fused compare-and-branch instructions")
	INITIALIZE_PASS (SystemZElimCompare, DEBUG_TYPE, "SystemZ Comparison Elimination", false, false) static bool preservesValueOf(MachineInstr &MI
static bool	resultTests (MachineInstr &MI, unsigned Reg)
static bool	isLoadAndTestAsCmp (MachineInstr &MI)
static unsigned	getCompareSourceReg (MachineInstr &Compare)
static bool	isAddWithImmediate (unsigned Opcode)
static bool	isCompareZero (MachineInstr &Compare)

Variables
unsigned	Reg

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "systemz-elim-compare"

Definition at line 36 of file SystemZElimCompare.cpp.

Function Documentation

getCompareSourceReg()

static unsigned getCompareSourceReg ( MachineInstr &  Compare )

static

Definition at line 169 of file SystemZElimCompare.cpp.

References assert(), and isLoadAndTestAsCmp().

INITIALIZE_PASS()

INITIALIZE_PASS	(	SystemZElimCompare	,
		DEBUG_TYPE	,
		"SystemZ Comparison Elimination"	,
		false	,
		false
	)		&

isAddWithImmediate()

static bool isAddWithImmediate ( unsigned  Opcode )

static

Definition at line 331 of file SystemZElimCompare.cpp.

isCompareZero()

static bool isCompareZero ( MachineInstr &  Compare )

static

Definition at line 494 of file SystemZElimCompare.cpp.

References isLoadAndTestAsCmp().

isLoadAndTestAsCmp()

static bool isLoadAndTestAsCmp ( MachineInstr &  MI )

static

Definition at line 158 of file SystemZElimCompare.cpp.

References MI.

Referenced by getCompareSourceReg(), and isCompareZero().

resultTests()

static bool resultTests ( MachineInstr &  MI, unsigned  Reg  )

static

Definition at line 127 of file SystemZElimCompare.cpp.

References MI, and Reg.

STATISTIC() [1/4]

STATISTIC	(	BranchOnCounts	,
		"Number of branch-on-count instructions"
	)

STATISTIC() [2/4]

STATISTIC	(	EliminatedComparisons	,
		"Number of eliminated comparisons"
	)

STATISTIC() [3/4]

STATISTIC	(	FusedComparisons	,
		"Number of fused compare-and-branch instructions"
	)

STATISTIC() [4/4]

STATISTIC	(	LoadAndTraps	,
		"Number of load-and-trap instructions"
	)

Variable Documentation

Reg

unsigned Reg

Initial value:

{
  switch (MI.getOpcode()) {
  case SystemZ::LR:
  case SystemZ::LGR:
  case SystemZ::LGFR:
  case SystemZ::LTR:
  case SystemZ::LTGR:
  case SystemZ::LTGFR:
    if (MI.getOperand(1).getReg() == Reg)
      return true;
  }
 
  return false

Definition at line 110 of file SystemZElimCompare.cpp.

Referenced by resultTests().