LLVM 24.0.0git
Public Types | Public Member Functions | Public Attributes | List of all members
llvm::Rematerializer::Reg Struct Reference

A rematerializable register, potentially defined by multiple instructions. More...

#include "llvm/CodeGen/Rematerializer.h"

Public Types

using RegionUsers = SmallDenseSet<MachineInstr *, 4>

Public Member Functions

MachineInstr * getFirstDef () const
MachineInstr * getLastDef () const
Register getDefReg () const
 Returns the rematerializable register from one of its defining instructions.
bool hasUsersInDefRegion () const
bool hasUsersOutsideDefRegion () const
unsigned getDefIdx (MachineInstr *DefMI) const
 Returns the index of DefMI in the register's definitions order.
LLVM_ABI std::pair< MachineInstr *, MachineInstr * > getRegionUseBounds (unsigned UseRegion, const LiveIntervals &LIS) const
 Returns the first and last user of the register in region UseRegion.
bool isAlive () const

Public Attributes

SmallVector< MachineInstr *, 1 > Defs
 All instructions that define the register, in program order.
unsigned DefRegion
 Defining region of the register.
LaneBitmask Mask
 The rematerializable register's lane bitmask.
SmallDenseMap< unsigned, RegionUsers, 2 > Uses
 Uses of the register, mapped by region.
SmallVector< RegisterIdx, 2 > Dependencies
 This register's rematerializable dependencies, one per unique rematerializable register operand over all definitions.

Detailed Description

A rematerializable register, potentially defined by multiple instructions.

A rematerializable register has a set of dependencies, which correspond to the unique read register operands of its defining instruction(s) and which can themselves be rematerializable. Operands of defining instructions corresponding to unrematerializable dependencies are managed by and queried from the rematerializer, whereas rematerializable ones are part of this struct and identified through their register index.

A rematerializable register also has an arbitrary number of users in an arbitrary number of regions, potentially including its own defining region. When rematerializations lead to operand changes in users, a register may find itself without any user left, at which point the rematerializer deletes it (emptying Reg::Defs).

Definition at line 125 of file Rematerializer.h.

Member Typedef Documentation

◆ RegionUsers

using llvm::Rematerializer::Reg::RegionUsers = SmallDenseSet<MachineInstr *, 4>

Definition at line 133 of file Rematerializer.h.

Member Function Documentation

◆ getDefIdx()

unsigned llvm::Rematerializer::Reg::getDefIdx ( MachineInstr * DefMI) const
inline

Returns the index of DefMI in the register's definitions order.

Returns the number of definitions if DefMI is not a definition of the register.

Definition at line 166 of file Rematerializer.h.

References DefMI, Defs, and llvm::find().

◆ getDefReg()

Register llvm::Rematerializer::Reg::getDefReg ( ) const
inline

Returns the rematerializable register from one of its defining instructions.

Definition at line 147 of file Rematerializer.h.

References assert(), DefMI, and getFirstDef().

Referenced by llvm::Rematerializer::printID(), llvm::Rematerializer::printRematReg(), and llvm::Rematerializer::rematerializeReg().

◆ getFirstDef()

MachineInstr * llvm::Rematerializer::Reg::getFirstDef ( ) const
inline

Definition at line 142 of file Rematerializer.h.

References Defs.

Referenced by getDefReg().

◆ getLastDef()

MachineInstr * llvm::Rematerializer::Reg::getLastDef ( ) const
inline

Definition at line 143 of file Rematerializer.h.

References Defs.

Referenced by llvm::Rematerializer::findRematInRegion(), and llvm::PreRARematStage::initGCNSchedStage().

◆ getRegionUseBounds()

std::pair< MachineInstr *, MachineInstr * > Rematerializer::Reg::getRegionUseBounds ( unsigned UseRegion,
const LiveIntervals & LIS ) const

Returns the first and last user of the register in region UseRegion.

If the register has no user in the region, returns a pair of nullptr's.

Definition at line 939 of file Rematerializer.cpp.

References assert(), and Uses.

Referenced by llvm::PreRARematStage::initGCNSchedStage(), and llvm::Rematerializer::rematerializeToRegion().

◆ hasUsersInDefRegion()

bool llvm::Rematerializer::Reg::hasUsersInDefRegion ( ) const
inline

Definition at line 153 of file Rematerializer.h.

References DefRegion, and Uses.

◆ hasUsersOutsideDefRegion()

bool llvm::Rematerializer::Reg::hasUsersOutsideDefRegion ( ) const
inline

Definition at line 157 of file Rematerializer.h.

References DefRegion, and Uses.

◆ isAlive()

bool llvm::Rematerializer::Reg::isAlive ( ) const
inline

Definition at line 175 of file Rematerializer.h.

References Defs.

Referenced by llvm::Rematerializer::isPermanentlyDead(), llvm::Rematerializer::printID(), llvm::Rematerializer::printRematReg(), and llvm::Rollbacker::rollback().

Member Data Documentation

◆ DefRegion

unsigned llvm::Rematerializer::Reg::DefRegion

Defining region of the register.

Definition at line 129 of file Rematerializer.h.

Referenced by llvm::Rematerializer::findRematInRegion(), hasUsersInDefRegion(), hasUsersOutsideDefRegion(), llvm::Rematerializer::printID(), llvm::Rematerializer::printRematReg(), llvm::Rematerializer::recreateReg(), and llvm::Rematerializer::rematerializeReg().

◆ Defs

SmallVector<MachineInstr *, 1> llvm::Rematerializer::Reg::Defs

All instructions that define the register, in program order.

Definition at line 127 of file Rematerializer.h.

Referenced by getDefIdx(), getFirstDef(), getLastDef(), llvm::PreRARematStage::initGCNSchedStage(), isAlive(), llvm::Rematerializer::printRematReg(), llvm::Rematerializer::recreateReg(), llvm::Rematerializer::rematerializeReg(), and llvm::Rollbacker::rollback().

◆ Dependencies

SmallVector<RegisterIdx, 2> llvm::Rematerializer::Reg::Dependencies

This register's rematerializable dependencies, one per unique rematerializable register operand over all definitions.

Definition at line 140 of file Rematerializer.h.

Referenced by llvm::PreRARematStage::initGCNSchedStage(), and llvm::Rematerializer::rematerializeReg().

◆ Mask

LaneBitmask llvm::Rematerializer::Reg::Mask

The rematerializable register's lane bitmask.

Definition at line 131 of file Rematerializer.h.

Referenced by llvm::Rematerializer::rematerializeReg().

◆ Uses

SmallDenseMap<unsigned, RegionUsers, 2> llvm::Rematerializer::Reg::Uses

Uses of the register, mapped by region.

Users that also define a part of the register are considered defs and not accounted for here.

Definition at line 136 of file Rematerializer.h.

Referenced by llvm::Rematerializer::findRematInRegion(), getRegionUseBounds(), hasUsersInDefRegion(), hasUsersOutsideDefRegion(), llvm::PreRARematStage::initGCNSchedStage(), llvm::Rematerializer::printRematReg(), llvm::Rematerializer::transferAllUsers(), and llvm::Rematerializer::transferRegionUsers().

The documentation for this struct was generated from the following files:
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