RISCVVLOptimizer.cpp File Reference

#include "RISCV.h"
#include "RISCVSubtarget.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/InitializePasses.h"

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "riscv-vl-optimizer"
#define	PASS_NAME   "RISC-V VL Optimizer"

Functions
static LLVM_ATTRIBUTE_UNUSED raw_ostream &	operator<< (raw_ostream &OS, const OperandInfo &OI)
static LLVM_ATTRIBUTE_UNUSED raw_ostream &	operator<< (raw_ostream &OS, const std::optional< OperandInfo > &OI)
static std::pair< unsigned, bool >	getEMULEqualsEEWDivSEWTimesLMUL (unsigned Log2EEW, const MachineInstr &MI)
	Return EMUL = (EEW / SEW) * LMUL where EEW comes from Log2EEW and LMUL and SEW are from the TSFlags of MI.
static unsigned	getIntegerExtensionOperandEEW (unsigned Factor, const MachineInstr &MI, const MachineOperand &MO)
	Dest has EEW=SEW.
static std::optional< unsigned >	getOperandLog2EEW (const MachineOperand &MO, const MachineRegisterInfo *MRI)
static std::optional< OperandInfo >	getOperandInfo (const MachineOperand &MO, const MachineRegisterInfo *MRI)
static bool	isSupportedInstr (const MachineInstr &MI)
	Return true if this optimization should consider MI for VL reduction.
static bool	isVectorOpUsedAsScalarOp (const MachineOperand &MO)
	Return true if MO is a vector operand but is used as a scalar operand.

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "riscv-vl-optimizer"

Definition at line 28 of file RISCVVLOptimizer.cpp.

PASS_NAME

#define PASS_NAME   "RISC-V VL Optimizer"

Definition at line 29 of file RISCVVLOptimizer.cpp.

Function Documentation

getEMULEqualsEEWDivSEWTimesLMUL()

static std::pair< unsigned, bool > getEMULEqualsEEWDivSEWTimesLMUL ( unsigned  Log2EEW, const MachineInstr &  MI  )

static

Return EMUL = (EEW / SEW) * LMUL where EEW comes from Log2EEW and LMUL and SEW are from the TSFlags of MI.

Definition at line 139 of file RISCVVLOptimizer.cpp.

References llvm::RISCVVType::decodeVLMUL(), llvm::RISCVII::getLMul(), llvm::RISCVII::getSEWOpNum(), and MI.

Referenced by getOperandInfo().

getIntegerExtensionOperandEEW()

static unsigned getIntegerExtensionOperandEEW ( unsigned  Factor, const MachineInstr &  MI, const MachineOperand &  MO  )

static

Dest has EEW=SEW.

Source EEW=SEW/Factor (i.e. F2 => EEW/2). SEW comes from TSFlags of MI.

Definition at line 165 of file RISCVVLOptimizer.cpp.

References llvm::MachineOperand::getOperandNo(), llvm::RISCVII::getSEWOpNum(), llvm::Log2_32(), and MI.

Referenced by getOperandLog2EEW().

getOperandInfo()

static std::optional< OperandInfo > getOperandInfo ( const MachineOperand &  MO, const MachineRegisterInfo *  MRI  )

static

Definition at line 782 of file RISCVVLOptimizer.cpp.

References assert(), getEMULEqualsEEWDivSEWTimesLMUL(), getOperandLog2EEW(), llvm::MachineOperand::getOperandNo(), llvm::MachineOperand::getParent(), MI, MRI, and llvm::RVV.

getOperandLog2EEW()

static std::optional< unsigned > getOperandLog2EEW ( const MachineOperand &  MO, const MachineRegisterInfo *  MRI  )

static

Dest EEW encoded in the instruction

Definition at line 182 of file RISCVVLOptimizer.cpp.

References assert(), getIntegerExtensionOperandEEW(), llvm::MachineOperand::getOperandNo(), llvm::MachineOperand::getParent(), llvm::RISCVII::getSEWOpNum(), Info, llvm::RISCVII::isFirstDefTiedToFirstUse(), llvm::RISCVII::isTiedPseudo(), llvm_unreachable, MI, llvm::MCOI::OPERAND_REGISTER, and llvm::RVV.

Referenced by getOperandInfo().

isSupportedInstr()

static bool isSupportedInstr ( const MachineInstr &  MI )

static

Return true if this optimization should consider MI for VL reduction.

This white-list approach simplifies this optimization for instructions that may have more complex semantics with relation to how it uses VL.

Definition at line 823 of file RISCVVLOptimizer.cpp.

References MI, and llvm::RVV.

isVectorOpUsedAsScalarOp()

static bool isVectorOpUsedAsScalarOp ( const MachineOperand &  MO )

static

Return true if MO is a vector operand but is used as a scalar operand.

Definition at line 1234 of file RISCVVLOptimizer.cpp.

References llvm::MachineOperand::getOperandNo(), llvm::MachineOperand::getParent(), MI, and llvm::RVV.

operator<<() [1/2]

static LLVM_ATTRIBUTE_UNUSED raw_ostream & operator<< ( raw_ostream &  OS, const OperandInfo &  OI  )

static

Definition at line 121 of file RISCVVLOptimizer.cpp.

References OS.

operator<<() [2/2]

static LLVM_ATTRIBUTE_UNUSED raw_ostream & operator<< ( raw_ostream &  OS, const std::optional< OperandInfo > &  OI  )

static

Definition at line 127 of file RISCVVLOptimizer.cpp.

References OS.