RISCVVLOptimizer.cpp File Reference

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

Go to the source code of this file.

Classes
struct	OperandInfo
	Represents the EMUL and EEW of a MachineOperand. More...

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

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

Functions
static bool	isVectorRegClass (Register R, const MachineRegisterInfo *MRI)
	Return true if R is a physical or virtual vector register, false otherwise.
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 >	llvm::RISCVVType::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 bool	isMaskOperand (const MachineInstr &MI, const MachineOperand &MO, const MachineRegisterInfo *MRI)
	Check whether MO is a mask operand of MI.
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 (MachineOperand &MO)
	Return true if MO is a vector operand but is used as a scalar operand.
static bool	mayReadPastVL (const MachineInstr &MI)
	Return true if MI may read elements past VL.

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

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 169 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 736 of file RISCVVLOptimizer.cpp.

References assert(), llvm::RISCVVType::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 197 of file RISCVVLOptimizer.cpp.

References assert(), getIntegerExtensionOperandEEW(), llvm::MachineOperand::getOperandNo(), llvm::MachineOperand::getParent(), llvm::MachineOperand::getReg(), llvm::RISCVII::getSEWOpNum(), llvm::RISCVII::isFirstDefTiedToFirstUse(), isMaskOperand(), llvm_unreachable, MI, MRI, and llvm::RVV.

Referenced by getOperandInfo().

isMaskOperand()

static bool isMaskOperand ( const MachineInstr &  MI, const MachineOperand &  MO, const MachineRegisterInfo *  MRI  )

static

Check whether MO is a mask operand of MI.

Definition at line 186 of file RISCVVLOptimizer.cpp.

References llvm::MachineOperand::getOperandNo(), llvm::MachineOperand::getReg(), llvm::MachineOperand::isReg(), isVectorRegClass(), MI, and MRI.

Referenced by getOperandLog2EEW().

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 778 of file RISCVVLOptimizer.cpp.

References MI, and llvm::RVV.

isVectorOpUsedAsScalarOp()

static bool isVectorOpUsedAsScalarOp ( MachineOperand &  MO )

static

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

Definition at line 1064 of file RISCVVLOptimizer.cpp.

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

isVectorRegClass()

static bool isVectorRegClass ( Register  R, const MachineRegisterInfo *  MRI  )

static

Return true if R is a physical or virtual vector register, false otherwise.

Definition at line 73 of file RISCVVLOptimizer.cpp.

References llvm::RISCVRI::isVRegClass(), MRI, and llvm::TargetRegisterClass::TSFlags.

Referenced by isMaskOperand().

mayReadPastVL()

static bool mayReadPastVL ( const MachineInstr &  MI )

static

Return true if MI may read elements past VL.

Definition at line 1100 of file RISCVVLOptimizer.cpp.

References 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, and OperandInfo::print().

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.