llvm::BaseIndexOffset Class Reference

Helper struct to parse and store a memory address as base + index + offset. More...

#include "llvm/CodeGen/SelectionDAGAddressAnalysis.h"

Public Member Functions
	BaseIndexOffset ()=default
	BaseIndexOffset (SDValue Base, SDValue Index, int64_t Offset, bool IsIndexSignExt)
SDValue	getBase ()
SDValue	getBase () const
SDValue	getIndex ()
SDValue	getIndex () const
bool	equalBaseIndex (const BaseIndexOffset &Other, const SelectionDAG &DAG) const
bool	equalBaseIndex (const BaseIndexOffset &Other, const SelectionDAG &DAG, int64_t &Off) const

Static Public Member Functions
static BaseIndexOffset	match (const LSBaseSDNode *N, const SelectionDAG &DAG)
	Parses tree in Ptr for base, index, offset addresses. More...

Detailed Description

Helper struct to parse and store a memory address as base + index + offset.

We ignore sign extensions when it is safe to do so. The following two expressions are not equivalent. To differentiate we need to store whether there was a sign extension involved in the index computation. (load (i64 add (i64 copyfromreg c) (i64 signextend (add (i8 load index) (i8 1)))) vs

(load (i64 add (i64 copyfromreg c) (i64 signextend (i32 add (i32 signextend (i8 load index)) (i32 1)))))

Definition at line 33 of file SelectionDAGAddressAnalysis.h.

Constructor & Destructor Documentation

BaseIndexOffset() [1/2]

llvm::BaseIndexOffset::BaseIndexOffset ( )

default

Referenced by match().

BaseIndexOffset() [2/2]

llvm::BaseIndexOffset::BaseIndexOffset ( SDValue  Base, SDValue  Index, int64_t  Offset, bool  IsIndexSignExt  )

inline

Definition at line 42 of file SelectionDAGAddressAnalysis.h.

Member Function Documentation

equalBaseIndex() [1/2]

bool llvm::BaseIndexOffset::equalBaseIndex ( const BaseIndexOffset &  Other, const SelectionDAG &  DAG  ) const

inline

Definition at line 52 of file SelectionDAGAddressAnalysis.h.

References match(), N, and Other.

Referenced by calculateByteProvider(), numVectorEltsOrZero(), operator!=(), replaceShuffleOfInsert(), and ShrinkLoadReplaceStoreWithStore().

equalBaseIndex() [2/2]

bool BaseIndexOffset::equalBaseIndex	(	const BaseIndexOffset &	Other,
		const SelectionDAG &	DAG,
		int64_t &	Off
	)		const

Definition at line 22 of file SelectionDAGAddressAnalysis.cpp.

References B, llvm::MachineFunction::getFrameInfo(), llvm::SelectionDAG::getMachineFunction(), llvm::SDValue::getNode(), llvm::MachineFrameInfo::getObjectOffset(), and llvm::MachineFrameInfo::isFixedObjectIndex().

getBase() [1/2]

SDValue llvm::BaseIndexOffset::getBase ( )

inline

Definition at line 47 of file SelectionDAGAddressAnalysis.h.

Referenced by operator!=(), replaceShuffleOfInsert(), and ShrinkLoadReplaceStoreWithStore().

getBase() [2/2]

SDValue llvm::BaseIndexOffset::getBase ( ) const

inline

Definition at line 48 of file SelectionDAGAddressAnalysis.h.

getIndex() [1/2]

SDValue llvm::BaseIndexOffset::getIndex ( )

inline

Definition at line 49 of file SelectionDAGAddressAnalysis.h.

Referenced by replaceShuffleOfInsert().

getIndex() [2/2]

SDValue llvm::BaseIndexOffset::getIndex ( ) const

inline

Definition at line 50 of file SelectionDAGAddressAnalysis.h.

match()

BaseIndexOffset BaseIndexOffset::match ( const LSBaseSDNode *  N, const SelectionDAG &  DAG  )

static

Parses tree in Ptr for base, index, offset addresses.

Definition at line 79 of file SelectionDAGAddressAnalysis.cpp.

References llvm::ISD::ADD, BaseIndexOffset(), C, llvm::LSBaseSDNode::getAddressingMode(), llvm::MemSDNode::getBasePtr(), llvm::SDValue::getNode(), llvm::LSBaseSDNode::getOffset(), llvm::SDNode::getOpcode(), llvm::SDNode::getOperand(), llvm::SDValue::getResNo(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::ISD::LOAD, llvm::SelectionDAG::MaskedValueIsZero(), llvm::ISD::MUL, llvm::ISD::OR, llvm::ISD::POST_DEC, llvm::ISD::PRE_DEC, llvm::ISD::PRE_INC, llvm::ISD::SIGN_EXTEND, llvm::ISD::STORE, and llvm::TargetLowering::unwrapAddress().

Referenced by llvm::SelectionDAG::areNonVolatileConsecutiveLoads(), calculateByteProvider(), equalBaseIndex(), numVectorEltsOrZero(), operator!=(), replaceShuffleOfInsert(), and ShrinkLoadReplaceStoreWithStore().

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

• include/llvm/CodeGen/SelectionDAGAddressAnalysis.h
• lib/CodeGen/SelectionDAG/SelectionDAGAddressAnalysis.cpp