llvm::GISelAddressing Namespace Reference

Classes
class	BaseIndexOffset
	Helper struct to store a base, index and offset that forms an address. More...

Functions
LLVM_ABI BaseIndexOffset	getPointerInfo (Register Ptr, MachineRegisterInfo &MRI)
	Returns a BaseIndexOffset which describes the pointer in Ptr.
LLVM_ABI bool	aliasIsKnownForLoadStore (const MachineInstr &MI1, const MachineInstr &MI2, bool &IsAlias, MachineRegisterInfo &MRI)
	Compute whether or not a memory access at MI1 aliases with an access at MI2.
LLVM_ABI bool	instMayAlias (const MachineInstr &MI, const MachineInstr &Other, MachineRegisterInfo &MRI, AliasAnalysis *AA)
	Returns true if the instruction MI may alias Other.

Function Documentation

aliasIsKnownForLoadStore()

bool llvm::GISelAddressing::aliasIsKnownForLoadStore	(	const MachineInstr &	MI1,
		const MachineInstr &	MI2,
		bool &	IsAlias,
		MachineRegisterInfo &	MRI )

Compute whether or not a memory access at MI1 aliases with an access at MI2.

Returns

true if either alias/no-alias is known. Sets IsAlias accordingly.

Definition at line 101 of file LoadStoreOpt.cpp.

References llvm::dyn_cast(), llvm::GISelAddressing::BaseIndexOffset::getBase(), llvm::getDefIgnoringCopies(), llvm::GISelAddressing::BaseIndexOffset::getOffset(), getPointerInfo(), llvm::LocationSize::getValue(), llvm::GISelAddressing::BaseIndexOffset::hasValidOffset(), llvm::LocationSize::hasValue(), llvm::MachineFrameInfo::isFixedObjectIndex(), llvm::LocationSize::isScalable(), llvm::Register::isValid(), and MRI.

Referenced by instMayAlias().

getPointerInfo()

BaseIndexOffset llvm::GISelAddressing::getPointerInfo	(	Register	Ptr,
		MachineRegisterInfo &	MRI )

Returns a BaseIndexOffset which describes the pointer in Ptr.

Definition at line 80 of file LoadStoreOpt.cpp.

References llvm::getIConstantVRegValWithLookThrough(), llvm::MIPatternMatch::m_GPtrAdd(), llvm::MIPatternMatch::m_Reg(), llvm::MIPatternMatch::mi_match(), MRI, and Ptr.

Referenced by aliasIsKnownForLoadStore().

instMayAlias()

bool llvm::GISelAddressing::instMayAlias	(	const MachineInstr &	MI,
		const MachineInstr &	Other,
		MachineRegisterInfo &	MRI,
		AliasAnalysis *	AA )

Returns true if the instruction MI may alias Other.

This function uses multiple strategies to detect aliasing, whereas aliasIsKnownForLoadStore just looks at the addresses of load/stores and is tries to reason about base/index/offsets.

Definition at line 185 of file LoadStoreOpt.cpp.

References aliasIsKnownForLoadStore(), llvm::LocationSize::beforeOrAfterPointer(), llvm::dyn_cast(), llvm::details::FixedOrScalableQuantity< LeafTy, ValueTy >::getKnownMinValue(), llvm::LocationSize::getValue(), llvm::LocationSize::hasValue(), llvm::LocationSize::isScalable(), llvm::MIPatternMatch::m_GPtrAdd(), llvm::MIPatternMatch::m_ICst(), llvm::MIPatternMatch::m_Reg(), MI, llvm::MIPatternMatch::mi_match(), MRI, llvm::Offset, llvm::Other, llvm::LocationSize::precise(), Register, and Size.