BaseIndexOffset Struct Reference

Collaboration diagram for BaseIndexOffset:

List of all members.

Public Member Functions
	BaseIndexOffset ()
	BaseIndexOffset (SDValue Base, SDValue Index, int64_t Offset, bool IsIndexSignExt)
bool	equalBaseIndex (const BaseIndexOffset &Other)
Static Public Member Functions
static BaseIndexOffset	match (SDValue Ptr)
	Parses tree in Ptr for base, index, offset addresses.
Public Attributes
SDValue	Base
SDValue	Index
int64_t	Offset
bool	IsIndexSignExt

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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 9043 of file DAGCombiner.cpp.

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Constructor & Destructor Documentation

BaseIndexOffset::BaseIndexOffset

(

)

[inline]

Definition at line 9049 of file DAGCombiner.cpp.

BaseIndexOffset::BaseIndexOffset	(	SDValue	Base,
		SDValue	Index,
		int64_t	Offset,
		bool	IsIndexSignExt
	)		[inline]

Definition at line 9051 of file DAGCombiner.cpp.

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Member Function Documentation

bool BaseIndexOffset::equalBaseIndex

(

const BaseIndexOffset &

Other

)

[inline]

Definition at line 9055 of file DAGCombiner.cpp.

References Base, Index, and IsIndexSignExt.

static BaseIndexOffset BaseIndexOffset::match

(

SDValue

Ptr

)

[inline, static]

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

Definition at line 9061 of file DAGCombiner.cpp.

References ADD, llvm::SDNode::getOpcode(), llvm::SDNode::getOperand(), llvm::ISD::MUL, and llvm::ISD::SIGN_EXTEND.

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Member Data Documentation

SDValue BaseIndexOffset::Base

Definition at line 9044 of file DAGCombiner.cpp.

Referenced by equalBaseIndex().

SDValue BaseIndexOffset::Index

Definition at line 9045 of file DAGCombiner.cpp.

Referenced by equalBaseIndex().

bool BaseIndexOffset::IsIndexSignExt

Definition at line 9047 of file DAGCombiner.cpp.

Referenced by equalBaseIndex().

int64_t BaseIndexOffset::Offset

Definition at line 9046 of file DAGCombiner.cpp.

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

• DAGCombiner.cpp